Please find a list of faults for your tv
CTC197CE2 et tries to come on 3 times, if unsolder collector of horizontal
>o/p chassis will run. A: Dead, pulsates three times, unsoldering collector
>of horizontal output transistor found that set would start (power supply was
>OK). If set starts replace IHVT (flyback). Common on this chassis
>
>Proscan Model # PS36125 Chassis # CTC197CG Q: HZ Output Transistor Failure
>A: Unsolder, scrape leads, and resolder coil between HZ Driver Transformer
>and Base of HZ Output Transistor
>
>RCA Chassis # CTC197CG Q: HZ Output Transistor Failure A: Unsolder, scrape
>leads, and resolder coil between HZ Driver Transformer and Base of HZ Output
>Transistor
>
>PROSCAN CTC197AD3 HSPF# 4176 RCA CTC197AC HSPF# 4113 RCA CTC197AH HSPF# 4229
>RCA CTC197AH2 HSPF# 4196 RCA CTC197AH3 HSPF# 4296 RCA CTC197AK2 HSPF# 4066
>
>RCA CTC197CA HSPF# 4052 RCA CTC197CJ3 HSPF# 4389RCA CTC197CK HSPF# 4389
>
>RCA PS27600 CTC197All snow Unit has no tuning of any channel from the main
>tuner. When monitoring the tuning voltages at U17501(5,6,7,& 8) were all
>running at 30 volts no matter what channel the TV was on. Inspecting all the
>tuning voltage paths from the PLL chip U17501 found that the path that Pin 5
>supplied had a 52K resistance to ground. On the other side of R17508, a 47K
>resistor we found the resistance path to ground was 4.2K. Capacitor C17713
>was leaky. PN# 192020.
>
>
>PS32109 CTC197Arcing Serial # 738560420J Unit will not turn on but there is
>an arcing in the neck of the tube. Unit has a defective CRT. CRT #
>A80AEJ16X09 VLS # TG9194-AF
>
>Proscan PS36500 CTC197Arcing (Snivits) 36 " ctc197 that has a weird symptom.
>First of all, its intermittent. second its not affected by freeze or heat.
>symptom is picture starts to get horizontal tearing and break up
>and 1" vertical band of snow band on the left side. It will get worse and
>eventually take over picture and the flyback and yoke starts making a
>sizzling type noise and then all of a sudden it just stops. Also does it
>in aux input mode. The interference was picked up not only by other tvs in
>the shop but also by radios. NOTE: I started working on this in customers
>home and found that the ground pin for the focus/screen controls was
>completely open, I soldered it back but at the time didn't give it allot
>237506 flyback was cause. I just bet
>this was the cause of this rare problem
>
>
>RCA F36690 CTC197 Auto program Takes too long to change channels Will not
>autoprogram. But it will manually program and store all the channels in the
>memory.Tech needs to initialize the EPROM with the chipper checker and
>create a file for the product. It may require the alignment of the IF VCO or
>IF APC. Each one will cause the set to be sluggish and Cause the set to not
>auto program 100% of the time.
>
>RCA PS27500 CTC197AUTO PROGRAM Tuner skips several channels when using the
>auto program feature.Unit had a broken trace at C509
>
>RCA PS36700 CTC197AUTO PROGRAM Unit has two symptoms. 1. If the channels are
>direct accessed the set will take 15 seconds to before the picture would
>show up. 2. When the volume, brightness, contrast, etc. is adjusted the set
>will take too long for the execution of the function. The bar graph will
>take 1o to 15 seconds to execute the next level up. The T4 chip VCO is not
>running at the correct frequency. When measuring the U16201(12) we found the
>voltage too high (7+ volts)`. When the set is placed on a active channel,
>and the voltage is checked on this pin it was over 6.8 volts. Using the
>chipper checker we were not able to reduce this voltage lower than 4.9
>volts. It must be 3.8 volts + or - 0.8 volts. It is suggested the VCO coil
>be replaced (L12302) part number 215502
>
>RCA PS36700 CTC197 BAR ON SCREEN Unit operates fine intermittently but the
>lower portion of the screen has a 50 IRE bar that matched exactly the size
>of the PIP box. When the PIP box is invoked and
>moved up the screen the 50 IRE bar moves with it.Because of the thorough
>description of this symptom it appears the trouble must be in the FPIP IC
>U18100. This IC is used for the PIP and comb filter for both main and pip
>video.
>
>PS36605 CTC197 BLUE SCREEN Unit has a blue screen. Cannot achieve cut-off
>with G2. When tapping on the neck of the tube the blue screen returns to
>normal but will turn blue again in a few seconds.Tech will need a
>replacement CRT A90AEJ16X09. CRT approved by TCE tech line.
>
>RCAF36680CTC197CHANNEL CHANGE INOPERATIVEF36680 serial 831331772X Unit will
>not change channels. The display changes but the internal tuner will not.
>Seems to be stuck on channel 9.Tech needs to deselect all entries in the TV
>guide plus menu relating to the questions; Do you have a CATV BOX? Do you
>have a VCR? Do you have DSS?. Select "NO" to these items. It will give the
>tuner control functions back. If any of the items are selected "YES" then
>the customer will need a device that came with the set called a
>IR Blaster. It plugs into the rear of the set in the "G-LINK" connector. It
>enables the TV to "Talk" the VCR or CATV box Through the IR G-LINK. It will
>control them if the user wants to have the TV Guide plus put the VCR
>into record (timer type recording) or when the TV downloads the TV Guide
>plus data, It must search for a Host Television station that transmits the
>TV-GUIDE PLUS data. The TV change the channels on the CATV BOX rather than
>the TV if the only input to the set is a CATV BOX.
>
>PS36700 CTC197 CHANNEL CHANGE INOPERATIVE Unit has no tuning of VHF channel
>even though the channel display is changing. Checking the band switching at
>Q17503 Q17504, & Q17505 finds that everything is OK in those areas for low
>and high band VHF and UHF switching are OK. When monitoring
>the tuning voltages generated from the Quad OP amps in U17501(5,6,7,& 8) we
>found that pin 5 was the lowest voltage of all of the other pins. These is
>the tuning voltages for all the vaircaps in the tuner area. Pin 5 it
>the tuning voltage for the Local oscillator. It never went higher than 1
>volt no mater what channel was selected. Checking the resistance to ground
>on pin 5 we found it to be less than 1k it should be in the 20 megs +.
>Removing C17508 removed the load on that line and corrected d the fault.
>Capacitor PN is 197600 1000 @ 50 vdc SMD.
>
>RCA F27615 CTC197 Chipper Checker Unit operates fine but it does not show
>the usage display in the menu provided in the chipper checker dialogue
>box.All sets were tried out with the newest version of
>Chipper Checker. After loading the new version of the software Chipper
>Checker II ver 1.61, It was discovered the screen size in the selected in
>the computers display was set to 800X600 instead of 640X48
>
>RCAF32635CTC197CRTF32635S On bright white areas of the screen the screen
>temperature will change slightly and slowly return to normalThis is known as
>doming and is normal on most all picture tubes. It is caused By the
>expansion coefficient effect of the shadow mask inside the tube. As the
>bright beam passes through the holes in the shadow Mask the shadow mask
>heats up in that geographic area of the mask. Since that area is hotter than
>the surrounding area it expands more the cooler surrounding area. This
>causes a doming or a blistering effect of the mask causing the "Q" distance
>to change. The "Q" distance is the optimum distance between the surface of
>the shadow mask and the phosphor dot on the CRT face.
>
>RCA F36673 CTC197 CRT Unit has a blurry picture and arcing in the neck of
>the tube. Unable to check the Voltages at on the socket with tube
>disconnected due to sporadic arcing from the pins of the CRT A90AEJ15X01
>unit has blurry focus and arcing in the neck of CRT
>
>PS32109 CTC197 CRT Unit will not turn on but there is an arcing in the neck
>of the CRTUnit has a defective CRT. We will need a RCA approval from Thomson
>for this unit. Tube serial #D-YAGA8516 Code date 97-28, CRT # A80AEJ16X09
>VLS # TG9194-AF
>
>RCA PS32500 CTC197 Dead Unit is dead will not power up. Unit appears to have
>normal data and clock and all B+'s appear to be normal.Unit has DATA Clock,
>Reset, B+, on all components that connect to the T-4 chip. Q14301( C) was at
>36 volts all the time. It never changed from stand by to run mode. There was
>Horizontal drive to Q14301(B) at nearly 2 volts peak to peak. This high
>drive voltage indicated that Q14301 base was open, and it had a
>emitter/Collector leakage. Replaced Q14301 PN# 146851
>
>
>PS27500 CTC197 DeadUnit has no standby voltages Secondary B+ is pulsing. All
>voltages on secondary are pulsing at about 1/2 of their normal
>values.Checking all the silicon components in the primary I found a 10 ohm
>short across CR14102. This was caused by a shorted C14147 1.5 mfd @ 100vdc.
>Part number 214049
>
>
>RCA F36674 CTC197 dead Power supply is squealing nothing noticeably burned.
>But an ohms check on Q14401 fins a 30 ohm to ground. Checking the following
>components we found C14401, and CR14401 & Q14802 shorted. It is suggested
>that these and the following components be replaced, C14410, C14800,
>CR14800, CR14401.
>
>PS36677 CTC197 DEADF bad flyback transformer Now main B+ current and
>horizontal timing pulse
>are normal. When power is applied plug-in B+ at collector of horiz out
>starts out about 140V, but then runs away to over 170V and resistor R14126
>(30K) goes up in smoke. Tech statically checked the surrounding
>components, and they checked OK seem to check OK.R14126 is in the snubber
>circuit. If that guy blows you will need to replace C14122, CR14122, and
>C14128. Back EMF from T14101 is killing this resistor because one of the
>components in the snubber circuit has failed. As long as the flyback does
>not have a short circuit in the primary winding to ground, the power supply
>will produce approx. 165 vdc at CR14106(K) with no load. Static checking the
>components listed above will not tell you the true story about their health.
>REPLACE THEM!. Note: follow up----The device that was bad is CR14122.
>
>RCA PS27500 CTC197 dead shorted Chopper transistor Q14101 and a open R14145.
>These items were replaced but still no operation of the SMPS.It is a mystery
>why the resistor R14145 would be open and the FET Q14101 too. It is possible
>the set may have been hit with a line surge taking out the R14103 too. What
>is known is the set has no stand by voltages and no noise from power supply.
>Unit had defective Q14101, R14145 & R14103. Replacement corrected the fault.
>
>RCA PS27500 CTC197 dead shorted Chopper transistor Q14101 and a open R14145.
>These items were replaced but still no operation of the SMPS.It is a mystery
>why the resistor R14145 would be open and the FET Q14101 too. It is possible
>the set may have been hit with a line surge taking out the R14103 too. What
>is known is the set has no stand by voltages and no noise from power supply.
>Unit had an open in the trace
>from the R14103 to pin U14101(6)
>
>RCA PS32109 CTC197 dead Unit will not power up. No LED flashing in front.
>When checking the standby voltages from the output of the SMPS we found the
>supply has all stand by sources except the 16 volt source from CR14107.
>Further inspection finds that CR14107 has a severed leg at the body of the
>device hidden by its ferrite bead.
>
>RCA PS32500 CTC197 dead No secondary supply voltage in the stand by mode.
>All raw DC voltages are
>there in the primary sideAll primary voltages of power supply are present
>with the exception of U14101(3) which was "0" volts DC. This is one of the
>initial start up voltages for the Power Supply regulator IC. R14145 a 270K
>resistor was open in the primary of Power supply. Replacing it corrected the
>fault.
>
>RCA PS32500 CTC197 dead No secondary supply voltage in the stand by mode.
>All raw DC voltages are
>there in the primary sideAll primary voltages of power supply are present
>with the exception of U14101(3) which was "0" volts DC. This is one of the
>initial start up voltages for the Power Supply regulator IC. R14145 a 270K
>resistor was open in the primary OF Power supply
>
>RCA PS32500 CTC197 dead No stand by voltages from secondary of power supply.
>No oscillation from SMPS.Checking the e Soft start B+ at U14101((3) finds it
>to be "0" volts. D.C. resistance to ground is Approximately 5K (Normal)
>R14145 open (270K 1/2 watt) P N #193067
>
>RCA PS32500 CTC197 dead No stand by voltages from secondary of power supply.
>No oscillation from SMPS.R14145 open
>
>PS36605 CTC197 Dead Resoldered the tuner for intermittent reception. Now the
>set is dead. All stand by
>voltages are normal.Checking the DATA and CLOCK lines on U13101(3 & 4) find
>they are 13K resistance to ground. The same is true with U17501(18 &19) This
>indicates the I2C bus is not shorted or open and nothing bad happened in the
>resoldering process of the tuner. I next had the tech cut jumper wire
>JW12410 located at LL8 on the deflection circuit board. This turns on all of
>the switched Post regulators U14701, U14104, U18101... etc. Once confirming
>these regulators were running the next test was to see if U16201(20) had B+.
>It must be 7.5 vdc. In this unit the voltage was zero volts. It was
>discovered that there was no voltage at R14102. Following the traces to
>JW12143 location MM3 finds that one side of the jumper was torn loose from
>the trace. This apparently happened during the servicing of the tuner.
>
>RCA PS32500 CTC197 Dead No secondary supply voltage in the stand by mode.
>All raw DC voltages are there in the primary side.All primary voltages of
>power supply are present with the exception of U14101(3) which was "0" volts
>DC. This is one of the initial start up voltages for the Power Supply
>regulator IC. R14145 a 270K resistor was open in the primary of the power
>supply.
>
>RCA F36674 CTC197 Dead Power supply is squealing. A visual check of the
>supply finds nothing noticeably burned. But an ohms check on Q14401 finds a
>30 ohm to ground. Checking the following components we found C14401, and
>CR14401 & Q14802 shorted. It is suggested that these and the following
>components be replaced, C14410, C14800, CR14800, CR14401.
>
>RCA PS32109 CTC197 Dead Unit will not power up. No LED flashing in front.
>When checking the standby voltages from the output of the SMPS we found the
>supply has all stand by sources except the 16 volt source from CR14107.
>Further inspection finds that CR14107 has a severed leg at the body of the
>device hidden by its ferrite bead. There was not enough lead to connect it
>to the board. Replacement corrected the problem.
>
>PSNPS27500CTC197DeadUnit will not turn on. If the Secondary B+ finds it
>pulsing. All voltages on secondary are pulsing at 30% of their
>values.Checking all the silicon components in the Primary I found a 10 ohm
>short across CR14102. This was caused by a shorted C14147 1.5 mfd @ 100vdc.
>Part number 214049
>
>RCA PS32500 CTC197 Dead Unit will not turn on. Unit does not have any action
>of LED's on front.U13102(8) the EPROM we find 5 volts but the reset on the
>CPU- U13101(51) finds it running at (0) volts instead of 5 volts. Micro is
>stuck in reset. Measuring the voltages at the secondary of T14101 finds that
>all the voltages at each diode is correct with the exception of CR14107(C)
>They should be 15 volts but it was only 8 volts. Checking the voltage at the
>filter C14106 finds the voltage is "0" volts. There was a hairline
>separation in the trace between CR14107 and the high side of C14106.
>
>RCA PS27500 CTC197 Out of focus band across the screen that related to
>contrast in the pictureUnit has
>defective CRT. When moving focus control through its range the band get
>thicker and spreads wider. Unit has defective CRT
>
>RCA PS27500 CTC197 Out of focus band across the screen that related to
>contrast in the pictureUnit has defective CRT
>
>PS35500 CTC197 HIGH VOLTAGE Unit will turn on but not develop high voltage.
>When the flash on set is turned on the power led will light up but it will
>only flash 3 times then stopLED will flash if there is no high voltage, and
>it will try to restart. The collector of Q14401 and Q14301 measures 165 vdc
>in the stand by mode. When the set is turned on the voltages drop to 133 &
>80 volts respectively. I asked the tech to jumper Q1440
>
>
>PS35500 CTC197 HIGH VOLTAGE Unit will turn on but not develop high voltage.
>When the flash on set is turned on the power led will light up but it will
>only flash 3 times then stopLED will flash if there is no high voltage, and
>it will try to restart. The collector of Q14401 and Q14301 measures 165 vdc
>in the stand by mode. When the set is turned on the voltages drop to 133 &
>80 volts respectively. I asked the tech to jumper Q14401(E&B) together and
>turn on the set and measure the collector of the Q14301(C ). It was
>
>
>PS36605 CTC197 HORIZONTAL Unit has a symptom in the video where if vertical
>lines were to be displayed on the screen they have a horizontal time base
>jitter. The Jitter causes the lines to e broken up into what appears like
>dots across a 1/2 wide area from the left and right of the vertical line.
>This only appears on the extreme left and right side of the picture and
>quickly diminishes as we look at the second and third vertical from the far
>sides. I had tech short the Pin modulator diode CR14800, and see if this
>symptom disappeared. It did. The trouble is caused by some high frequency
>ripple or noise in the pin modulator circuit. Checking with oscilloscope the
>source of the E/W pin correction at U16201(17) was very clean. However at
>the second output of the dual op amp U14802(7) was very noisy. A slight
>parabolic waveform could be seen but had a lot of high frequency noise on
>the leading edge of the parabolic wave. Closer inspection of the board found
>the C14804 a .027 mfd SMD had fallen off the board. After reinstalling the
>capacitor the vaveform cleaned up with almost no high frequency noise.
>
>RCA PS36605 CTC197 horizontal TV has flagging at the top of the screen. This
>is intermittent. Horizontal and vertical sync is extracted internally in
>U16201. The video must be a minimum of 1 volt pp measured at
>U16201(38). This television was only 800 mv. However at the C12710(minus) we
>had 1.1 volts pp video, where the other side we only had 0.8 volts. The ESR
>of this capacitor was over 150 ohms. Unit had defective Capacitor. C12710
>
>RCA PS32500 CTC197 LINE Unit has bright screen with retrace linesUnit has
>200 vdc source voltage from the cathode of CR14702. But on the CRT driver
>board a resistor R15108 is burned up. This resistor is attached to theG1
>supply for the CRT. It may be possible the CRT arc A80AEJ16X09 tube ser
>D-WBLTG055 code date L28GE17. DOP is 1-17-99.
>
>PS36605 CTC197 PIP When the PIP is turn on the PIP has a sever stretch to it
>and will not correctly position itself using the remote control. The Square
>box for the PIP gets stretched across the screen when trying to move to the
>opposite side of the screen.U18101 is the only thing that will cause this
>problem It is the F2PPIP chip. It handles all PIP insertion functions, Comb
>Filter operations for both PIP and Main. Tech changed U18101 and solved the
>trouble.
>
>RCA PS36700 CTC197 PIP Unit operates fine intermittently but the lower
>portion of the screen has a 50 IRE bar that matched exactly the size of the
>PIP box. When the PIP box is invoked and moved up the screen the 50 IRE bar
>moves with it.Because of the thorough description of this symptom it appears
>the trouble must be in the FPIP IC U18100. This IC is used for the PIP and
>comb filter for both main and pip video.
>
>RCA PS32500 CTC197 REMOTE. Unit has no remote control functions. Unit has
>all functions on the front panel keyboard. When checking the Data out of the
>IR receiver all we are getting is a 5 volt high. No part number is listed
>for this item in the ESI or parts finder software. Unit has defective
>IR13401 IR receiver part number 245282. This is the all plastic opaque type
>
>RCA PS32500 CTC197 remoteUnit will not operate with remote. All functions
>operate on front panel keyboard.Unit has all functions on the front panel
>keyboard. When checking the Data out of the IR receiver
>all we are getting is a 5 volt high. No part number is listed for this item
>in the ESI or parts finder software. Unit has defective IR13401 IR receiver
>part number 245282. This is the all plastic opaque type
>
>RCA PS36500 CTC197 REMOTE Unit has poor remote sensitivity. MK2198. Unit was
>serviced before for the same trouble but it appears it was not corrected.If
>the IR. receiver is pulled out from inside the television the remote control
>works fine. Observing the cabinet opening where the IR. light, from the
>outside world comes from we find a solid piece of plastic covering any type
>of lens of IR. band pass filter that might be built into the cabinet. It is
>unclear how this IR. information is getting to the IR. receiver if the area
>exposing the IR.
>receiver is shadowed by a solid black piece of plastic. Tech need to order
>the mask assay. MK2198. But when the Mask came in the piece that held the
>IR. sensor was missing from the Mask assembly.. Called Larry May at RCA the
>part number of what we need is 243585.
>
>
>RCA PS32500 CTC197 Unit has no remote control functions. Unit has all
>functions on the front panel keyboard. When checking the Data out of the IR
>receiver all we are getting is a 5 volt high. Unit has defective
>IR13401 IR receiver part number 245282.
>
>PS27500 CTC197 shutdown Unit will not turn on unless we forcing the set on
>by entering the service mode. When the error codes are 128, in P1, P2, P3.
>This indicates the audio decoder failureChecking the B+ to the U11600(22) we
>found only 1.1 vdc on this chip. At the Q11600(E) had only1.1 volts and
>Q11600(B) was 1.3 volts. It was discovered that C11629 located at the base
>of Q11600 the 9 volt regulator turned into a 42 ohm resistor.
>
>RCA PS36500 CTC197 SHUTDOWN Unit goes into immediate shut down at power up.
>Checking the high voltage the set will develop high voltage but will shut
>off and cycle on and off. If we disable the horizontal output transistor and
>try again, the set , obviously not achieve high voltage but it should stay
>on and provide a horizontal drive signal unit the set is turned off. This
>was not the case here. The set continued to cycle on and off and provided
>good horizontal drive at Q14301 horizontal driver transistor. U13101(37) is
>the only pin that never goes high when training book says it must be 5 volts
>in the run mode. When checking the other CPU "Must Haves" we find nothing
>unusual. All B+ sources for stand by and run are normal. Unit approved for
>IFS
>
>
>PS27600 CTC197 Unit will intermittently shutdown and my not be able to turn
>back on for hours. The set will not record any error codes.It was by chance
>that we were monitoring the reset pulse at U13101(51). This
>line went low and did not return to normal 5 volts unless we heated the area
>around 1 ~5 & A ~ E. These are located on the corner of the CBA. Checking
>the reset transistors finds that Q13503(B) was at .6 volts
>keeping the reset on U13101(51) low. Checking back to find he source of the
>0.6 volts we found the voltage was increasing as we got further away from
>Q13503. We finally measured both sides of C13504 ad found that both sides
>had voltages 5 volts on one side an 3.3 on the other. Capacitor is a .1 mfd
>at 50 volts PN# 190552. Replacing it and cleaning off the red glue corrected
>the problem.
>
>PS32600 CTC197 No tuning All snow. Determined that the unit was band
>switching. Checked for 33v supply at pin 4 of PLL chip (U17501), "0" volts.
>Checked 18 ohm 2watt resistor R14159 for open. Resistor was good. Had 140
>volts on one side and next to nothing on the other. Checked resistance
>
>PS32600 CTC197 No tuning All snow. Determined that the unit was band
>switching. Checked for 33v supply at pin 4 of PLL chip (U17501), "0" volts.
>Checked 18 ohm 2watt resistor R14159 for open. Resistor was
>good. Had 140 volts on one side and next to nothing on the other. Checked
>resistance of pin 4 U17501 and found it to be 63 ohms to ground, (sounds
>like me trouble). Eliminated u17501 by lifting pin 4, also lifted several
>other parts off of the 33v line. Finally found that the short was
>originating from the pip tuner. The 33v is fed to both tuners. By
>disconnecting the plug restored normal tuning to unit, thus verifying that
>the main tuner was ok. Continued to check for shorts......Found shorted SMD
>C17407 on the 33v line on the pip tuner board. Replaced and restored normal
>operation to entire set. Fix: Replace shorted C17407, part# 197600.
>
>RCA F36674 CTC197 Tuner gain Unit is getting a blank screen stating the
>words "Weak Signal" Unit is getting Video to the input of U26901(6) but
>nothing out on U26901(13). I asked the tech to enter the TV GUIDE plus set
>up mode and read me the options in the set up dialogue. When the tech got to
>the part of the set up that discussed "Do you have a VCR?" It had been
>selected and it was available on Video 1 only. Unit has TV Guide set up
>incorrectly. I had the tech enter an illegal zip code (99999) and tell the
>set up the No DSS, no VCR, and No cable box is present. The illegal zip code
>will cause a auto reset of the TV GUIDE Plus
>module and will remove it's hold on the chassis tuner. This corrected the
>problem. Now the tech will need to reset up the TV GUIDE PLUS correctly.
>
>RCA PS27600 CTC197 TUNING Unit has a problem where all the channels it
>receives is off frequency. AFT will not pull it inTech needs to look at the
>value of the IF VCO in the Chipper Checker menu. This value can be
>moved up or down as much as 10 digits to see if the effect is will correct
>the symptom or not. Moving the value of this setting does not change the
>symptom.
>
>RCA PS27115 CTC197 TUNING Unit does not have reception above channel 50.
>Previous tech from another service center out and resoldered tuner. After
>tech left and the customer tried to use the set they discovered no reception
>above channel 50Q17504(C) . These are band switching transistors and will
>inhibit the operation of the tuner above channel CATV 50. Unit did have a
>open Q17504.
>
>RCA PS32500 CTC197 TUNING Unit has no reception on any channels. The number
>changes but nothing else on the screen but snow. There is a difference in
>the amount of back ground noise when a channel is
>selected to the different bands with in this tuner.. Checked all the TV
>guide plus setup data found that all was correct. Further hardware checking
>found the Cathode of CR14115 (location 20 MM) only 4 volts. This
>is supposed to be the 33 vdc line for the tuner. Measuring the resistance to
>ground found it to be varying from "0" ohms to 27K while flexing chassis.
>Removing tuner shield revealed FB17203 (CBA location L19) a
>ferrite bead next to the tuner shield had a solder splash on it causing a
>short to the tuner shield and pulling the 33 vdc source to ground.
>
>PS32500 CTC197 TUNING When running the set over a long period of time the
>set will go to snow then back to normal after a fraction of a second. The
>only error code that can be read is error 21. This is not a valid error
>code. Technician resoldered the tuner grounds without effecting the symptom.
>Recommend the tech go back and resolder the PLL and Mixer/Osc U7501, U7301
>in the tuner assembly. These are both surface mounted capacitors. The
>process is to be sure the chassis is totally level, and paint solder flux on
>both IC's. Resolde the pins by wiping the solder from the chip to the tip of
>the leg in strokes. Once this is accomplished then the tuner is thoroughly
>cleaned with flux remover or solvent and a stiff short bristle brush made of
>natural material. NO PLASTIC BRUSHES!!!!!
>
>RCA PS32500 CTC197 TUNING Unit takes too long to direct access channels.
>Will not aurtoprogram.This delay in direct accessing the channel is too
>long.. It should be about 125 milli seconds. The tech needs to
>enter the alignment parameters of the IF and see that the IF-VCO parameter
>is 98 and the AFC OFFSET is 24. Next is to exit out of the service mode and
>disconnect the Chipper Checker. Turn on the set without an antenna connected
>and select a low band VHF channel from 2 ~ 6 and wait for 10 seconds. This
>allows the CPU to time out and will stop searching for a signal from the
>tuner. Next connect the antenna to the television and monitor the voltage at
>U16201(12) It must be 3.8 volts. If not, adjust L12302 CCW for 3.8 volts. If
>the voltage jumps radically replace L12302 part# 215502. In this test unit
>we did have a defective L12302.
>
>
>PS32600 TUNING CTC197CK Unit does not have high band VHF channelsUnit does
>not have band switching from Low band VHF to High band VHF. There is correct
>band switching at U17501(17) but no change in level at the collector of
>Q17503( C). The collector is always -11.5 volts. When tech was indicating
>there looks like a component missing at coordinates K 19. Checking the
>voltages at Q17503(B) finds the voltage swing from channe6 to channel 7 is
>11.8 to .1 volts. This swing is too far for this PNP transistor. There
>should only be a .7 volt drop with respect to the emitter. Unit has a
>defective Q17503. After the transistor was not soldered
>
>RCA PS27600 CTC197 TUNING Unit takes too long for the picture to lock in on
>channel when direct accessed. Also auto programming does not work. When
>measuring U16201(12) we find the voltage to be 5.3 volts. It should be about
>2.9 volts. This voltage is the AFT crossover voltage. To set this correctly
>you must disconnect the antenna and direct access a local channel strong
>enough to receive but not strong enough to receive without an antenna.
>Direct access this channel and wait for 10 seconds then connect the antenna.
>Measure the voltage at U16201(12) It should be 2.9 volts. If not adjust coil
>L12302 so the voltage at (16201(12) is approximately 2.9 vdc. If this
>voltage can be achieved then try to autoprogram the unit. In this unit the
>original voltage was too high and was brought back to normal with a small
>tweak of L12302. Unit is
>functioning fine.
>
>RCA PS27500 CTC197 Tuning Unit will not get channels from 7 to 13 plus most
>of the other CATV channels, yet the low band VHF is perfect. Checking the
>output of U17501(17) and switching the channel from 6 to 7, the voltage will
>swing from 11.7 volts on channel 6 to "0" volts on channel 7. But when
>checking the voltage at Q17503( C) we found the voltage to be always -11.6
>volts no matter what band we were on. It should have swung to a +12 volts on
>high band VHF. Transistor Q17503(B) never changed either. Base and emitter
>voltage was always the same. But the transistor did not measure shorted.
>However replacing the transistor corrected the problem. Part number 215496.
>This is a PNP surface mounted transistor.
>
>RCA PS27500 CTC197 Tuning Unit will not get channels from 7 to 13 plus most
>of the other CATV channels, yet the low band VHF is perfect. Checking the
>output of U17501(17) and switching the channel from 6 to 7, the voltage will
>swing from 11.7 volts on channel 6 to "0" volts on channel 7. But when
>checking the voltage at Q17503( C) we found the voltage to be always -11.6
>volts no matter what band we were on. It should have swung to a +12 volts on
>high band VHF. Transistor Q17503(B) never changed either. Base and emitter
>voltage was always the same. But the transistor did not measure shorted.
>However replacing the transistor corrected the problem. Part number 215496.
>This is a PNP surface mounted transistor.
>
>
>Proscan PS36500 CTC197 tuningUnit has no UHF or CATV reception above channel
>50 on the main tuner. However the PIP tuner works fineChecking the
>bandswitching at U17501(14) finds the bandswitching is fine when switching
>from CATV channel 50 to 51, but when checking Q17505(C ) the voltage is
>always 11.5 volts. Q17503(B) swings from 0 to 11.2 volts during
>bandswitching. Transistor Q17405 is defective. Part # 231534. This is a
>digital transistor and it checked open using the diode check mode on a Fluke
>77.
>
>RCA PS32500 CTC197 TURN-ON INOPERATIVE Unit will not turn on. Unit does not
>have any action of LED's on front.U13102(8) the EPROM we find 5 volts but
>the reset on the CPU- U13101(51) finds it
>running at (0) volts instead of 5 volts. Micro is stuck in reset. Measuring
>the voltages at the secondary of T14101 finds that all the voltages at each
>diode is correct with the exception of CR14107(C) They
>should be 15 volts but it was only 8 volts. Checking the voltage at the
>filter C14106 finds the voltage is "0" volts. There was a hairline
>separation in the trace between CR14107 and the High side of C14106.
>
>RCA PS36700 CTC197 TURN-ON INOPERATIVE Unit will not turn on. Television has
>all of the necessary voltages at the System control and standby supplies.
>U13101(19) never goes high when the power is
>pressed. Unit cannot be forced on By pressing and hold menu, Then power then
>volume up then release
>
>PS32500 CTC197 TURN-ON INOPERATIVEUnit will run for a while until the set is
>turned off. Once off then turned on again the set will not turn on. No LED
>illumination or auto start attempts will occur until 30 to 40 seconds of
>wait time. After this wait time the set will turn on just fine. No other
>malfunction. Error codes in tech menu indicate error 16 stuck bus.Checking
>the "Run" Data and clock signals during the power up sequence we found the
>set did not correctly start up with clean signals. There were signals within
>the 5 volt peak to peak
>pulse train that were lower than the bulk of the pulse train. By
>substitution U18100 F2PIP chip was causing the trouble.
>
>PSNPS36500CTC197tURN-ON INOPERATIVEUnit will not turn on. Pushing the
>power button makes (U13101(19) go high, but he TV still will not turn on.
>While checking the "RUN" data/clock lines on U13101(3&4) we discovered the
>data line was running at 1.9 volts peak to peak not the 5 volts
>pp.Unplugging the TV and measuring the resistance to ground on the
>U13101(4) "RUN Data line finds it to be 1.8K verses the clock line (3) at
>13K.. Measuring the resistance to ground at each peripheral the uses the
>"RUN" data line we found the resistance drop to 745 ohms at Q18102(c ).
>Removing this service mounted transistor caused the solder land for the
>collector to go to 13K. Replacing the device corrected the trouble. Part #
>219412. This is a NPN SMD transistor.
>
>RCAF32645CTC197TV GUIDE PLUSF32645 Serial 520287768 Customer operates
>television on a satellite system. He is too far from the city to receive
>local television and is not supported by CATV. Customer does not want TV
>Guide to operate.There is no was to disconnect the TVG from the set that
>Thomson will approve, but the tech can enter and illegal zip code into the
>system and cause it to shut down. And illegal zip code could be 99999.
>This should stop it from trying to download anything.
>
>RCAPS32600CTC197TV GUIDE PLUSPS32600 serial 912631148 TV guide plus does
>not load data. In the TV guide set up mode the customer answered yes to
>the VCR. He should not unless he is using their blaster to communicate to
>the VCR. Cust does not have the IR blaster. So the answer to all the
>question in the TV guide plus set up must all be "NO". I order for the
>tech to do this he must enter a zip code of 99999, then finish the setup
>process. Wait for 5 minutes, at which point the set will default to an
>error condition due to the illegal Zip code. Then enter the correct Zip
>code and wait for the next down load time.
>
>RCAPS32700CTC197TV GUIDE PLUSPS32700 serial 836531479. Unit will not
>download the TV guide Plus info to make the VCR recordI had tech reset the
>TV guide module by entering the Guide plus setup program the hitting the
>"Go back" button on the remote then hit the "TV" button twice. This clears
>the old data in the system and starts a internal test program. It will
>check the ROM, RAM, VBI, and G-LINK. All passed except the VBI and Glink.
>The VBI did not pass because it was not on the host channel. The Glink did
>not pass possibly because the Glink cable is defective or a bad IR blaster
>at the end of the G-link cable. The G-link is necessary for VCR
>programming because the television will turn on the VCR via the G-link
>cable and IR blaster, make the VCR select the channel, and place it in the
>record mode. Apparently the TV guide plus module was connected
>incorrectly. The connector J23905 was connected to the front video line
>input. There does not appear to be any cable from J23905 to J26401. Tech
>will need to hard wire a jumper from J23905(1) to J26401(2) J23905(2) to
>J26401(1) Note: these are opposite from each other.
>
>RCAPS36500CTC197TV GUIDE PLUSPS36600 serial 846331490. Unit does not
>always download TV guide plus data. Customer has a VCR, and is on cable
>TVThe customer has the VCR connected in series with the R.F. path where
>the CATV from the street goes into the VCR then out of the VCR to the
>Television. Customer must watch the VCR on channel 3. This is not the best
>hook up of the VCR in this application. When used in this manor the
>customer must used the IR blaster that came with his television. This way
>the TV will control the VCR through the IR blaster and the TV will
>download the Gemstar data by using the VCR tuner. One drawback from this
>configuration is the VCR needs to be on all of the time, and the TV will
>always be on channel 3.
>
>PSNPS36500CTC197VERTICALPS36500 Unit has no vertical sweep. The horizontal
>line is elevated 2 inches above center. Monitoring the yoke voltage we
>found 23 volts. Also the 13 volt supply was at 22 volts. However when
>disconnecting the vertical yoke winding the 13 volt voltage return to
>normalChecking the vertical output for damaged or burnt components found
>nothing. But when heating the area around the T-4 chip U16201 we found
>that components in the area where vertical drive comes from full sweep
>returned. Spot heating of C14501 & C14503 caused the vertical sweep to
>return. Removing the capacitors and cleaning the component adhesive the
>capacitors and Board are defective
>
>PSNPS36700CTC197VERTICALPS36700 Unit has vertical over scan and the
>picture is tilted. Tech needs to know where the parameters are that
>control this values.Suggest the tech get into the customer menu and select
>screen. Once in the screen menu select Picture tilt. Adjust PIX tilt so
>the image is level. Next Enter the tech menu and select the parameter 10 &
>11or vertical centering and vertical size. Adjust for normal scan and turn
>the set off. This action will store the values.
>
>PS36605CTC197verticalUnit has weak vertical sync lock. Horizontal
>OKHorizontal and vertical sync is extracted internally in U16201. The
>video must be a minimum of 1 volt pp measured at U16201(38). This
>television was only 700 mv. However at the C12710(minus) we had 1.1 volts
>pp video, where the other side we only had 0.7 volts. Unit had defective
>Capacitor. C12710
>
>RCAF36670CTC197verticalUnit made a loud squeal in the back of the set then
>the vertical sweep became very distorted. The bottom of the picture was
>pulled up and the top very stretched. Tech needs to check the presence of
>the "Half voltage supply" a 13 volts supply at the flyback. Unit had a
>shorted CR14703 =207878(large) and a open R14705= 829A10. This supply
>provides the necessary bias for the input of the vertical output IC.
>
>PSNPS36500CTC197videoPS36500. Serial # 927631446 Unit has intermittently
>looses video but still has sound. Does not have the symptom if using the
>External video input. Suggest the tech look at the Input switching area
>for the trouble. Assuming the set never looses the video when running in
>the External input mode, and the set still has sound it logically limits
>the possibilities to The input switch U26901. This IC is responsible for
>the routing of 4 different video sources from 4 different inputs. If
>everything works in the Video input mode and in the tuner mode there is no
>video then It would suggest the trouble is located in the Switching IC.
>(Based on the techs initial observation that the set had audio in the
>tuner mode.
>
>PSNPS36700CTC197VideoPicture contrast is abnormal in a band that covers
>the bottom 1/3 of the screen. This can be seen in the oscilloscope when
>viewed at U18101(41) when looking at the vertical rate 2 milli seconds.
>Pattern generator was set to gray scale vertical bars. Comparing the video
>at U18101(51) to pin 41 the difference was significant.Unit has an
>artifact that matched the window position for the PIP frame. It caused the
>transparent horizontal band at the bottom 1/3 of the screen. It was on all
>inputs. This was caused by the F2PIP chip. Part # 248640
>
>PSNPS27500CTC197video 1 missingUnit has no video when using the video 1
>input. We were able to track composite video from the video input of
>U26901(3), however nothing on the output side U269011(13).Monitoring
>composite to the input of the FPIP U18100(51) is OK. But there was no
>output on Pin 41. Oddly enough when we fed video into the Video 2 it
>worked as expected. Also Tuner mode operated fine. On other significant
>symptom not complained about was this TV did not have video in the S-video
>input. We could trace the Luminance from the S-video input to each side
>C26916, but nothing at he Input of IC18101(3). It was discovered that
>C18105 was open. Replacing the capacitor corrected both symptoms, both
>S-video and Video 1. The explanation of this phenomena was because the
>S-video input was essentialy open because of the open capacitor the F2PIP
>automatically switched to the input selector to S-video instead of video
>1. The design of the F2PIP chip senses activity on U18101(3) and it
>automatically switched inputs. This input was unterminated and noise got
>into the inout falsing the internal switch.
>
>PSNPS27500CTC197VIDEO NOISEPS27500 serial 849631568. Unit has heavy black
>and white horizontal dashes on the screen that are 3 to 4 inches long,
>that cover the entire screen. It does have On screen display and menu
>functions. I hade the tech check the luminance out of U18100(41) We had a
>saw tooth waveform nearly 1 volt peak to peak at 3 micro seconds period.
>This could also be seen at the input U18100(51). However the Output of the
>video switch U26901(13) was clean video. It was discovered that video was
>clean up to BPF circuit after Q18110(E) Capacitor C18101 was broken.
>
>No Video After Changing Flyback I get the OSD and audio but no video signal
>from the main tuner just a blank raster. Screen voltage is OK. I get video
>in the PIP window but when I swap pictures the main screen stays blank and
>only the audio
>changes. The jumper bewtween pins 7 & 8 of the fly is good.
>A: Was the old fly arcing ? If so it probably damaged the video circuit. The
>way PIP is accomplished in alot of sets makes it immune to ABL, which is the
>path by which the fly can do any damage. Even more common is the OSD not
>being affected by ABL.
>With a print you're looking for the pin of the fly at the bottom end of the
>high voltage secondary. Without a print you're looking for a pin on the fly
>with a cutout in the PC board to isolate it. This is so if the fly secondary
>arcs it won't cause a carbon track on the PCB and it also lessens the
>possibility of fire. There should usually be a reasonable positive DC
>voltage there. Some older sets would have the B+ on that pin and be
>resistored down for control of the video, but newer sets use dynamic ABL
>that is not clamped in normal operation. If you see 0V or a negative voltage
>there you are very close to the problem. Once you run it down and get your
>video back, view a high contrast fast moving scene with the picture cranked.
>You might even want to temporarily crank up the sub contrast, which you of
>course return to the old setting when you're done. What you are looking for
>then is compression and rarification of the raster lines. This dynamic ABL
>is used for sweep correction. On a direct view it usually goes to the
>vertical and video. Some projection sets also send it to the E-W pincushion
>as well and sometimes the integration network is a bit complex.
>If you lack a print, get the datasheet for the jungle (LA7612 ?) and work
>back from there as well. While you might have a shorted cap near the fly (in
>the circuit) it is also possible it zapped something that either amplifies
>or buffs the ABL line. The first check I would do is the resistance from the
>ABL pin to ground. If it's shorted start unsoldering stuff from it, or if
>you happen to have a low ohms meter you can find it that way. In a nutshell,
>I'd say it's a 99% chance or better that the problem is in the ABL
>somewhere. I'd go there unless you don't have sync. In case you don't know
>how to test for sync, the OSD will move if you remove the input signal. Just
>FYI if you don't have any OSD you turn up the G2 so you can see retrace
>lines and watch their behaviour when you apply
>or remove a valid video signal. You might not have to even bother, if the
>PIP image is stable you got sync usually.
>
>ProScan Chassis CTC197CG Model PS36125 Resolder the little coil between the
>HDT and the HOT. You usually cannot see the bad connection. I found it the
>first time with a scope. Can cause HOT transistor to fail
>
>CTC197 Intermittent audio. Video OK, All functions OK. Removing and
>reapplying power restores audio This trouble is caused by a defective data
>packet broadcast from a local TV station. The data packet is located in the
>VBI (Vertical Retrace Interval). It's purpose is for XDS (Extended Data
>Services) that is used by the GemStar circuitry. The condition is very
>intermittent and not much is known to the average TV technician because
>Thomson is not releasing much information to the public other than removing
>the power and reapplying it again. Thomson's answer to this issue is taking
>their case to the FCC and let them resolve the conflict between FCC and the
>broadcasters. This phenomena only effects certain Thomson chassis CTC197,
>CTC195 and CTC203. Only a specific run of serial numbers are affected.
