PANASONIC THP42U20A main board issues

[chrismurphy]

I have this main board issue with this panasonic tv
The TV powers up with steady green light no blinks , but no screen activity , all voltages on SC and SS boards are ok
suspected the main board , so i reflowed both chips on the board and now i get screen ok and picture ok no issues , but no sound . When i press the volume up button the TV shuts down . Any ideas ??

[happyade123]

Re: PANASONIC THP42U20A main board issues

Maybe leakage in the front panel buttons. Try disconnecting it and turn on and do volume up with remote . I know you probably know a lot more then me but just a suggestion Chris.

[R_J]

Re: PANASONIC THP42U20A main board issues

Check that the speaker wires are not pinched or touching the chassis somewhere, you may have a problem with the audio output chip.
Do you have the schematic? Check sos signal on D2014 or `C' of Q2301, does it change when vol up is pressed
Do you have s_15v on L2301 or L2302