Our LCD colour telivision no. RT-20La70 had not started while switching on dated . it was reported to LG helpline & register complaint no. mention above but no action was taken. it was reported our purchased shop at ganpati home appliances chalisgoan shri sushant pathak. who sent shri dixit from dhulia as a service engineer who has attended.the repair was not completed and mr dixit was given Rs.2000.00 . it was mention that tv needs to be carried to shop for checking and communicate that during checking due to their fault one of iChad blownoff and he will replace it without extra charge. it is regreeted to say that nothing has been done So far four month has been passed but no sign of satisfaction. kindly guide us to whom we have approach for getting our tv ready.
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It sounds like the power is pulsing - that would explain your speakers. Speakers wouldn't make that sound if they were getting power at a steady rate.
Look for a bad capacitor. It's possible you have one or more capacitors that have gone bad. They charge to a certain point, then somehow complete a circut momentarily and discharge, giving a pulsing flow of electricity. You can look for visible signs (leaking capacitors, or capacitors that are leaning over), or you can just start testing them with a voltmeter. If you find a bad one, you'll have to get a replacement and solder it in place.