FINLUX 50FPHD05 sound problems

[Vlad]

Hello
I am repairing this TV for last 2 weeks.
The problem with it is the sound. From left speaker is going beeep noise and from right speaker is the beeeping noise louder. It is a loooooong beeeeeeep which never ends.
I try to change the TDA chip but it didnt help. All capacitors are looking OK.
The sound signal is going from Main AV board to amplifier on which one is the TDA chip I changed.

If you know please help.