LG 47LB6300 - Bad Mainboard or TCON?

[tucocaps]

Another possible learning experience. This set has a damaged screen, but backlight appears to work, and set powers on and off and responds to remote.

The problem is there is no sound from the set, and I don't see any screen changes on the LCD for picture (just white backlight). Also, the optical out and network cable jack show no light on the mainboard.

Attached a picture of the mainboard. Didn't dig down to the TCON yet. There is a really small reset button of some sort on the main. When pushed, the backlights turn off, then back on when released.

Thanks for any help!

[tucocaps]

Re: LG 47LB6300 - Bad Mainboard or TCON?

Any ideas on this one? Could the power board be at fault?

[selldoor]

Re: LG 47LB6300 - Bad Mainboard or TCON?

Perhaps set it all up - with a signal source dvd/pc ? scroll through the "sources "using the remote see if anything occurs . Try for sound with headphones press the "mute" button
and try volume up on the remote. Next check the voltages on the connector from the power supply to the main - there may be clues near the socket as to what voltages there should be. - post a picture of the power supply.