I have an issues with an LG home theater, the sound goes on and off. The sound I. C power pack is OK and I have even change the sound I. C but it still not working... Please any idea.
Most likely cause is high ESR electrolytic capacitors in the PSU, you need an ESR meter or oscilloscope to check them. However, if you're lucky, a faulty one 'might' have a domed top.