Author Topic: Blaupunkt TV model W23/173I-GB-FHBKUP-DE no sound (Read 11605 times)

lineofstars · « **on:** November 10, 2014,06:32:51 »

Mulja tv repair portal · « **on:** November 10, 2014,06:32:51 »

Keith · « **Reply #1 on:** November 11, 2014,04:24:16 »

Hi your best option is to replace the main board.

http://www.ebay.co.uk/itm/MAIN-BOARD-TV-T-MSD309-28B-11235-/251673717340?pt=LH_DefaultDomain_186&hash=item3a98ec2a5c

U15 looks like it may be the audio amp IC, check for supply voltages to the chip, use an oscilloscope to check for audio input. try to inject an audio signal in to the IC and see if you get an output.The microprocessor chip or associated circuit could also be faulty as this will control the volume, the eeprom or flash data may also be corrupt.

Best to change the board!!

Keith

lineofstars · « **Reply #2 on:** November 11, 2014,07:54:52 »

Hi Keith.
Thanks for the ebay motherboard link you provided.Amazing because the board is right in Madrid,20km away.
But really ,to replace the hole board just for the IC YD 1517p FTBfY,....,its a bit wastey.
maybe I will be able to find the same IC,see the datasheet of it.If not,do you know an equivalent?

Mulja tv repair portal · « **Reply #2 on:** November 11, 2014,07:54:52 »

Keith · « **Reply #3 on:** November 11, 2014,08:44:40 »

It is actually a TDA1517P,

Good luck

watteau · « **Reply #4 on:** November 12, 2014,09:47:04 »

Hello,
Have you checked the electrolytic capacitors near the
TDA1517?
I had one that was short circuit and was shutting the IC down,
worth a check before changing the PCB.
Regards

lineofstars · « **Reply #5 on:** November 13, 2014,10:55:09 »

@watteau
I dont have a multmeter that can check the capacitors.
But on the board,they look good.
First ,with your help,I want to see IF the IC YD 1517p is good.
So,I already attached the datasheet of the IC but I will make a screen shot and I will attach here the IC diagram.
Turning the TV on, I have checked the voltage using the multimeter,the values are:
Vcc=12 to pin#7
1/2Vcc=0 to pin#3
Rest of the pins voltage=0.

Turning the TV off, In diode mode by multimeter with the black probe to GRD and red probe to the pin
#1 value is 796
#2 it beeps
#3 value is 796
#4 it beeps (why?)
#5 it beeps
#6 value is 792
#7 value is 1755
#8 starts from 1800 and goes to OverLimit
#9 value is 797
#10 to #18(the last pin that the IC has) it beeps cause is the GRD.

Turning the TV off, I have checked the resistance Ω(ohm mode) by multimeter with the black probe to GRD and red probe to the pin
#1 value is OL(over limit)
#2 value is 0
#3 value is OL
#4 value is 10 Ω ohms
#5 value 0
#6 value is OL
#7 value is OL
#8 value is OL
#9 value is OL
#10 to #18 value is 0
Based on this measurements please give me a hint about what is your idea if the IC is good,or guide me to do other measurements,or technics using the multimeter,beacause I only have this kind of measurement tool.
Are the above values correct?

Mulja tv repair portal · « **Reply #5 on:** November 13, 2014,10:55:09 »

lineofstars · « **Reply #6 on:** November 13, 2014,13:15:48 »

The link of the IC's datasheet is:
https://drive.google.com/file/d/0B72PSl5kuidmSTBQQ3g0eTZkVDQ/view?pli=1

So you can see the exact values of the manufacturer.

astracat · « **Reply #7 on:** November 13, 2014,17:33:00 »

try disconnecting speakers and see if volts appear on 4 and 3 if not suggest replacing ic also does it get hot to touch output pins are connected with a capacitor in series with speakers may be one leaking also cap on pin 3
suspect
regards
astracat

lineofstars · « **Reply #8 on:** November 14, 2014,11:44:46 »

Thanks for replay astracat.
All the measure were done with the TV on, without the speakers connected to the white 4pins slot.
Accordingly to the BLOCK DIAGRAM attached above, the pin#3 is 1/2Vcc.
So the Vcc in the datasheet(see the google drive link),shows 14.4V,therefore the pin#3 of the audio IC in question,suppose to have 7.2V,but shows 0V.
Question for ASTRACAT,pin#1(IN1, pin #4(OUT1) pin#6(OUT2),pin#9(IN2) ,wich is the voltage expected?

astracat · « **Reply #9 on:** November 14, 2014,15:36:02 »

hi
both output pins should be virtualy same voltage also change cap on pin 3 if no better suggest ic u/s but first isolate mute pin to make sure micro not turning it off it could still be memmory ic problem ,with mute isolated probe inputs should give a buzz from relevant speaker .note ic still possible suspect if buzz there then mem ic

regards
astracat

lineofstars · « **Reply #10 on:** November 14, 2014,18:29:25 »

@astracat
"both output pins should be virtualy same voltage",still I do not get what value must have pin#4 and 6 with the TV on.
Please specify it.

astracat · « **Reply #11 on:** November 15, 2014,15:15:51 »

hi
pin 4 should not beep as 10ohms speaker not disconnected if diconnected ic probably s/c internaly remove pin 4 from its connection if still beeps or 10 ohms ic definatly s/c only way to be sure is change it output pins will vary with signal on inputs ,have had this ic u/s before its easier to check with a scope

lineofstars · « **Reply #12 on:** November 19, 2014,18:16:16 »

Hi everyone.
I have changed the 100uF capacitor wich is in connection with pin#3 of the audio IC YD1517P.(see the datasheet link above)
I have changed the IC too.
But despite my effort,still no sound.
Any clue?

Keith · « **Reply #13 on:** November 20, 2014,05:22:33 »

What voltage do you have on pin 8?

Keith

lineofstars · « **Reply #14 on:** November 20, 2014,11:20:55 »

I have explained above.
Pin#8 shows 0 voltage.

Mulja tv repair portal · « **Reply #14 on:** November 20, 2014,11:20:55 »

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Author Topic: Blaupunkt TV model W23/173I-GB-FHBKUP-DE no sound (Read 11605 times)

Mulja tv repair portal

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Mulja tv repair portal

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