Mulja tv repair portal
Equipment Repairs => CRT TV forum => Topic started by: IratB on August 20, 2009,05:14:58
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Hello
I've had my Hitachi for several years now and every so often I get some text on the screen when I start up C2846TN and some such. I usually lose this by pushing two buttons on my remote, switching to standby then switching off. Yesterday when I did this however the sound levels seem to have dropped way off. Before I lost the on-screen text I may have changed the settings I guess.
:oops:
Does anyone know how to initiate the factory setting screen and/or restore the sound levels?
My expertise level is: nil
Any help or suggestions would be great, many thanks
IratB
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it is usually a corrupt nvm
tony walker
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Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0284]
Fault: C46TN ON SCREEN ON SWITCH ON
Symptom: WHEN SWITCHED ON THE O.S.D.
PROMPT SHOWS C46TN
Cause: SET IS IN FACTORY SET UP MODE
CURE:USING THE REMOTE HANDSET;
PRESS THE TWO VCR RECORD BUTTONS
SIMULTANEOUSLY. WHEN THE MENU APPEARS
GO TO STANDBY. SWITCH THE SET BACK ON
AND THE O.S.D. PROMPT WILL BE REMOVED
Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0288]
Fault: CHANNEL IDENT APPEARS WITH VCR PLAY
Symptom: WHEN PLAYING BACK A VCR TAPE
THE STATION IDENT FROM TELETEXT MAY
INTERMITTANTLY APPEAR.
CAUSE. CORRUPTION TO SYNC FROM THE
TAPE
CURE. EACH TIME VCR PLAYBACK STARTS
PRESS THE 'UPDATE 'BUTTON ON THE T.V.
HANDSET.
Model: C2846TN - 66cm COLOUR TV
Subject: SERVICE INFORMATION [#0299]
Fault: "MINI" HANDSET COMPATABILITY
THERE ARE TWO VERSIONS OF THE "MINI"
HANDSET AVAILABLE. THESE ARE USED IN
CONJUNCTION WITH THE C21/5/846TN AND
THE C21/547TN.THE TYPE & PART NUMBERS
ARE LISTED BELOW.
CL903 JHL00121 USE WITH 47 SERIES CTV
CL903A JHL00122 USE WITH 46 & 47 CTV
IF THE CL903 IS USED WITH THE 46
SERIES CTV, SOME BUTTONS MAY FAIL TO
OPERATE THE TELEVISION SET.
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0338]
Fault: LOSS OF COLOUR IN A.V. MODE
Symptom: COLOUR LOSS AFTER A PERIOD OF
TIME IN THE A.V. MODE
Cause: TOLERANCES IN CAPACITORS.
Cure: REPLACE C1308 WITH A 1n0 50v
PART No 0880031.
Model: C2846TN - 66cm COLOUR TV
Subject: TUNER/IF [#0349]
Fault: NO SOUND OR PICTURE-BLANK RASTER
Symptom: NO SOUND OR PICTURE, JUST A
BLANK RASTER.
Cause: FAULTY TUNER
Cure: FIT NEW TUNER UNIT PT/No E710029
Model: C2846TN - 66cm COLOUR TV
Subject: TUNER/IF [#0350]
Fault: PICTURE FLICKER - BLACK LINES
Symptom: FLICKERING BLACK LINES CAN BE
SEEN ACROSS THE PICTURE.
Cause: INTERMITTANT TUNER UNIT
Cure: REPLACE TUNER UNIT PT/No E710029
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0397]
Fault: COLOUR LOSS WITH MACRO VIDEO TAPES
Symptom: COLOUR LOSS ON HIGH CHROMA
SATURATION,THIN DARK AREA AT BOTTOM OF
PICTURE WHEN USING MACRO TAPES.
Cause: MACRO PROTECTION.
Cure: REPLACE I.C.201 PT/No T900623
TYPE TDA8362-N4.IF ORIGINAL IC201 IS
TYPE TDA8361, CHECK R523 IS 8K2 AND
FIT AS NECESSARY,PART No 0700053
Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0406]
Fault: "C46TN" OSD, AFTER REPLACING IC001
Symptom: AFTER REPLACING I.C.001 THE
O.S.D. SHOWS THE PROMPT "C46TN"
Cause: WHEN FIRST USED THE I.C. WILL
ENTER THE SET UP MODE.
Cure: FOLLOWING REPLACEMENT OF I.C.001
YOU WILL NEED TO BRING THE I.C. OUT OF
THE SET UP MODE. TO DO THIS YOU WILL
REQUIRE THE REMOTE CONTROL HANDSET
1) PRESS THE VCR RECORD BUTTONS BOTH
TOGETHER. THESE ARE THE TWO BOTTOM
OUTER BUTTONS ON THE HANDSET. THE MENU
ON SCREEN WILL CHANGE TO READ
VERSION 46 V1.0
STANDARD I
DEFAULT 0
AFC MID
2) PUT THE SET INTO STAND BY.
3) SWITCH THE SET BACK ON FROM STAND
BY. THE AUTO TUNE MENUE WILL APPEAR.
THE SET MAY BE TUNED IN AS REQUIRED.
Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0423]
Fault: CHANNEL IDENT APPEARS IN VCR PLAY
Symptom: WHEN PLAYING BACK RECORDINGS
OF OFF AIR PROGRAMMES, THE CHANNEL
IDENT APPEARS INTERMITTANTLY.
Cause: PACKET 830 IDENTIFICATION BY
MICRO PROCESSOR.
Cure: CHANGE I.C.001 PT. No T900644.
N.B..VCR PLAYBACK MUST BE VIA SCART TO
PREVENT RE-OCCURENCE OF SYMPTOMS.
Model: C2846TN - 66cm COLOUR TV
Subject: PART NUMBER CHANGES [#0426]
Fault: UPDATED I.C.201 - TDA8362-N4
Symptom: IC201 HAS BEEN CHANGED TO AN
ISSUE 4 MASK.
Cause: MASK CHANGE BY IC MANUFACTURER
Cure: WHEN ORDERING THIS NEW VERSION
OF IC201 USE PART NUMBER T900623. IF
THIS IS TO REPLACE TYPE TDA8361, CHECK
R523 IS 8K2 AND REPLACE AS NECESSARY.
PART No 0700053.
Model: C2846TN - 66cm COLOUR TV
Subject: AUDIO [#0460]
Fault: NO SOUND FROM OFF AIR STATIONS.
Symptom: PICTURE O.K. NO SOUND FROM
OFF AIR STATIONS.
Cause: I.C. FAILURE.
Cure: CHECK / REPLACE I.C.4051 TDA9800
PART NUMBER T900602
CHECK / REPLACE IC001 PT/NO T900644
CHECK / REPLACE IC002 PT/NO E730045
Model: C2846TN - 66cm COLOUR TV
Subject: VERTICAL STAGE [#0481]
Fault: FLYBACK LINES AT TOP OF PICTURE
Symptom: FLYBACK LINES VISIBLE AT THE
TOP OF THE PICTURE.
Cause: FAULTY FRAME I.C.
Cure: REPLACE FRAME IC601 TYPE TA8427K
PART NUMBER J2003951
Model: C2846TN - 66cm COLOUR TV
Subject: POWER SUPPLY [#0497]
Fault: INTERMITTANT GOES TO STANDBY
Symptom: SET INTERMITTANTLY REVERTS TO
'STANDBY' OR CUTS OUT.
Cause: DRY JOINTS
Cure: CHECK IC951 AND IC952 FOR DRY
JOINTS AND RESOLDER AS NECESSARY.CHECK
R719 AND R720 FOR DRY JOINTS. REPLACE
R950 AND SET +B FOR 146V +/- 0.2V
Model: C2846TN - 66cm COLOUR TV
Subject: POWER SUPPLY [#0499]
Fault: DEAD SET - ZD951 SHORT CIRCUIT
Symptom: SET DEAD, PROTECTION DIODE
ZD951 HAS GONE SHORT CIRCUIT
Cause: HT HAS RISEN TOO HIGH
Cure: REPLACE ZD951 P#2344122M (25")/
2344121M (21") AND IC901 OPTO COUPLER
P# 2917782 TYPE CNX82A. CHECK R950 68K
HAS NOT RISEN IN VALUE, AND IC951 &
IC952 FOR DRY JOINTS.
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0515]
Fault: APPEARANCE OF NICAM INDICATOR
Symptom: ERRATIC APPEARANCE OF THE
NICAM SYMBOLS USUALLY UPON SCENE
CHANGES FROM LIGHT TO DARK.
Cause: SHORT CIRCUIT ON NICAM I.C.
Cure: CHECK FOR SHORT CIRCUIT OF PINS
24 & 25 OF I.C.4201. IF S/C EXISTS
REMOVE.
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0519]
Fault: DIAGONAL PATTERNING ON LOW SIGNAL
Symptom: DIAGONAL COLOURED LINES IN
LOW SIGNAL CONDITIONS.
Cause: NICAM INTERFERENCE
Cure: REPLACE FERRITE BEADS FB005,6,7
& 8 WITH 10uH COIL PART No J2122239.
MOVE THE POSITION OF C4235 TO THE I.C.
SIDE OF FB005 SO THE IT IS NOW AT THE
JUNCTION OF FB005 AND PIN 3 OF IC4201
Model: C2846TN - 66cm COLOUR TV
Subject: POWER SUPPLY [#0522]
Fault: LOSS OF COLOUR & INTERMITTENT TRIP.
Symptom: LOSS OF COLOUR & INTERMITTENT
TRIP.
Cause: ZENER DIODE.
REPLACE ZD002. 5.1v ZENER.
PART NO. T536174
Model: C2846TN - 66cm COLOUR TV
Subject: SERVICE INFORMATION [#0552]
Fault: NO TUNING/ MAX.AUDIO NOT POSSIBLE.
Symptom: NO TUNING, MAX.AUDIO NOT
POSSIBLE.
Cause: TV IN PSEUDO HOTEL MODE.
CURE:PRESS/HOLD VOL+/-ON TV FRONT AND
SWITCH SET ON AT FRONT.PRESS 2 VCR REC
BUTTONS ON REMOTE.CHECK FOR"H"AT LOWER
RIGHT OF MENU.IF PRESENT,DELETE USING
-/--BUTTON.THEN GO TO STANDBY.
Model: C2846TN - 66cm COLOUR TV
Subject: AUDIO [#0556]
Fault: RANDOM APPEARANCE OF NICAM SYMBOLS
Symptom: RANDOM APPEARANCE OF NICAM
SYMBOLS. ALSO SOUND "POPPING".
Cause: DRY JOINTS ON IC951 & IC952.
Cure: RE-MAKE JOINTS ON IC951 & IC952.
SEE ALSO FAULT NO.515.
Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0558]
Fault: NO ON SCREEN GRAPHICS.
Symptom: NO ON SCREEN GRAPHICS, BUT
FUNCTIONS STILL OPERATE. I.E.VOL. ETC.
Cause: HORIZONTAL PULSE MISSING FROM
IC001 PIN26.
Cure: CHECK/REPLACE ZD002,PT.NO.
T536174.
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0562]
Fault: NO BLUE SIGNAL.
Symptom: NO BLUE SIGNAL.
Cause: OPEN CIRCUIT CAPACITOR.
Cure: CHECK/REPLACE C516.
PT. NO. 0880057R.
Model: C2846TN - 66cm COLOUR TV
Subject: POWER SUPPLY [#0596]
Fault: STUCK IN STANDBY.
Symptom: STUCK IN STANDBY.
CAUSE:DRY JOINTS ON IC 952.
CURE:CHECK/RE-SOLDER JOINTS ON IC952.
SEE ALSO FAULT NUMBER 497.
Model: C2846TN - 66cm COLOUR TV
Subject: AUDIO [#0597]
Fault: NO AUDIO, NICAM OR FM.
Symptom: NO AUDIO, NICAM OR FM.
FM AUDIO GOING INTO IC4201 PIN 7.
CAUSE:FAULTY MEMORY IC.
Cure: CHANGE IC 002. PT.NO.E730045.
Model: C2846TN - 66cm COLOUR TV
Subject: HORIZONTAL STAGE [#0636]
Fault: VALUE OF R705 INCORRECT IN MANUAL.
SYMPTOM:VALUE OF R705 INCORRECT IN
SERVICE MANUAL.
CAUSE:PRINTING ERROR.
CURE:THE CORRECT VALUE FOR R705 IS
1 OHM,2W.
PT.NO. IS R100549.
Model: C2846TN - 66cm COLOUR TV
Subject: AUDIO [#0758]
Fault: NO MONO SOUND NICAM SOUND OK
Symptom: NO MONO SOUND, NICAM SOUND OK
Cause: IC 1401 TYPE TA8777N
Cure: REPLACE IC 1401
IC 1401 PART NUMBER J2004651
Model: C2846TN - 66cm COLOUR TV
Subject: PART NUMBER CHANGES [#0762]
Fault: CHANGE OF CPT SOCKET
SYMPTOM:CHANGE OF TUBE SOCKET
CAUSE:ORIGINAL PART DISCONTINUED
CURE:NEW PART NUMBER FOR TUBE SOCKET
IS E822925
Model: C2846TN - 66cm COLOUR TV
Subject: AUDIO [#0807]
Fault: REPEATED FAILURE OF IC4450 AT SW ON
SECTION: APA
CONDITION: 1
Symptom: 511 NO SOUND
DEFECT: Q SHORT CIRCUIT
REPAIR: A REPLACE IC4450 ,C4466
AND C4467.
PART NUMBERS: IC4450 2020011
C4466&C4467 0800044R
Model: C2846TN - 66cm COLOUR TV
Subject: TUNING SELECTION [#0830]
Fault: C46TN ON SCREEN DISPLAY
SECTION: SYS
CONDITION: 2
SYMPTOM 134 C46TN OSD/NICAM SYMBOL
FLASHING
DEFECT: 1
REPAIR A REPLACE IC001 WITH NEW SOFT-
WARE VERSION.
IC001 PART # E730181 FOR EUROPE
E730180 FOR SCANDINAVIA
NOTE IC 001 IS REPLACED WITH NEW SOFT
WARE VERSION.THIS WILL PREVENT THE SET
ENTERING THE SERVICE MODE AND CONSTANT
FLASHING OF THE NICAM SYMBOL.
Model: C2846TN - 66cm COLOUR TV
Subject: PART NUMBER CHANGES [#0849]
Fault: CHANGE OF PART NUMBER , T901
SECTION: PSU
CONDITION: 1
Symptom: 185 T901 PT# CHANGED
DEFECT: A
REPAIR: A NEW PART # FOR T901 IS
L380119
Model: C2846TN - 66cm COLOUR TV
Subject: Y/C SIGNAL PROCESSING [#0850]
Fault: SPOT BURN-IMPROVEMENT
SECTION: APR LUMINANCE PROCESSING
CONDITION: 1
Symptom: 385 IMPROVEMENT OF SPOT BURN
DEFECT: Y
REPAIR: A TO IMPROVE SPOT BURN, R593
IS CHANGED FROM 10K TO 22K
Model: C2846TN - 66cm COLOUR TV
Condition: 1 Constantly
Symptom: 170 General function problem
Tip:
Symptoms: Front control buttons do not work.Volume cannot be adjusted past a certain point, tuning menu cannot be accessed. Please enter service mode and check data is as shown below and adjust as neccessary.
Put set into standby to store values.
IRIS
Section: SYS System control section
Defect: 1 Software problem
Repair: 1 Software correction
Model: C2846TN - 66cm COLOUR TV
Condition: 1 Constantly
Symptom: 51X No sound from 'offair' stations, but OK from Scart.
Tip:
No sound from 'off air' stations, OK via scart
When receiving normal televsion broadcasts the sound is muted to zero. The picture operates normally.
In this condition, sound operates normally when watching a VCR, Satellite, DVD etc via the Scart socket.
Replace the memory IC002. See details below.
When the IC has been replaced and first used, the set may display C46TN on screen.
To clear this:
1 Press the two VCR record buttons on the remote handset simultaneously
2 When the OSD changes, press the standby button on the remote control
3 Switch the set on once more. If the auto install menu appears, tune in channels as required
IRIS
Part: E730045 IC ST24C04
Reference: IC002 Memory IC
Section: SYS System control section
Defect: A Worn out
Repair: A Replacement
Model: C2846TN - 66cm COLOUR TV
Condition: 1 Constantly
Symptom: 119 No switch on from Standby
Tip:
Televison is in standby mode and will not switch on.
Check resistor R719 this may have become high value or open circuit.
IRIS
Part: 0119649 RES 56KOHM 1/8W +-1%
Reference: R719 Resistor
Section: PSU Power supply
Defect: R Open
Repair: A Replacement
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Thanks for your reply, I think the TV had gone into pseudo-hotel mode. After following the tips from your post I was able to correct the problem.
Thanks again - much appreciated.
Haydn.