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LED TV No Sound Repaired
Customer sent in this BG LED TV with the complaint of no sound. I had tested it and indeed it was no sound even though I have set the volume control to maximum.
For your information the common fault for no sound can be due to loosen speakers cable, bad audio output IC, missing or improper dc supply voltage to audio IC section and even corrupted memory IC data. The below photo are the circuit boards tat can be seen when the cover was removed.
As a repairer, one should always check the easiest problem first which is to locate to see if the speakers are properly connected or not. I found that the speakers cable were good except that the speakers does not have any ohm measurement when tested the two input points of the speakers with Ohmmeter. To me, it was an open circuit and I found it to be rare case because speakers rarely open up at the same time. But in this case, both speakers had an open reading.
I took out both the speakers and replaced with new one and the sound came back.
Conclusion- Assuming if both the speakers are still good then my next move will be to measure the Audio Output IC dc supply and may look into the memory ICs as well. If you wish to learn more repair tricks about LCD and LED TV repair you can check on Kent’s ebooks HERE.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out previous post about fixing active speaker in the below link: