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Old 08-09-2018, 03:17 AM   #1
Y. Signal
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Question Thomson 32HB3103 sound problem

Hello. This TV from grandma has a problem and I'd be very happy to repair it.

When I turn the TV on, after 20 minutes or so the sound stops. When I turn it off and wait some minutes and then I turn it on the sound works again but it's periodically interrupted by silence.

I have taken a photo and all the capacitors look fine, anyway since this does not mean they're working well, should I do a complete recap? any idea or something to check or try before ordering new caps?

The speakers are connected with the black&white and black&red connectors at the top right of the photo.
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Old 08-09-2018, 03:33 AM   #2
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Default Re: Thomson 32HB3103 sound problem

When the sound drops out if you spray the IC below the connectors (24/28 pin IC) with freezer spray does the sound come back up.
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Old 08-09-2018, 05:10 AM   #3
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Default Re: Thomson 32HB3103 sound problem

I'm going to look for that spray and try. Will report back.

You mean the 28 pins SMD IC that appears at the right black capacitor and below 4 inductors marked with "220", isn't it? It's marked as TPA3110D2
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Last edited by Y. Signal; 08-09-2018 at 05:25 AM..
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Old 08-09-2018, 07:22 AM   #4
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Default Re: Thomson 32HB3103 sound problem

I've let the TV turned on for a while with the case opened and the sound is working nice, so it must be a heat issue.

I've carefully touched the TPA3110D2 and it's not very hot. However, the aluminum heatsink located under "CQC" letters is burning hot... I plan to remove it, clean the surface with isopropanol and use a new adhesive thermal tape and a bigger heatsink if I find one that fits.

I have tried unsuccessfully to gently remove the heatsink but it seems attached to the IC with some kind of white glue instead of thermal adhesive tape... it looks to be the same used near the large capacitor, is this practice common?. Any idea?
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Last edited by Y. Signal; 08-09-2018 at 07:45 AM..
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Old 08-09-2018, 07:44 AM   #5
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Default Re: Thomson 32HB3103 sound problem

have you got a fan you can blow on too the back of the tv, you will know if its a heat related issue then and those ics do run hot some people mount a computer fan on the back casing over that area too keep it cool.
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Old 08-09-2018, 07:46 AM   #6
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Default Re: Thomson 32HB3103 sound problem

Thanks. I'll let the TV run for more time with a fan to be sure it's a heat problem.
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