Samsung PN63C8000 has sound no picture

[nwcs]

I determined the Y Main was bad so I replaced it and now all voltages are correct and it has sound now when it turns on. I brought up the test pattern by jumping ps on to ground and shorting pins 3 and four. If I turn the tv on after removing the jumper and the short the screen will flash and I hear the samsung tone but no picture is displayed. I read on a different thread that some one had the picture going black after a few minutes and replacing the main board fixed that. I was wondering if anyone else has any other things I can check.

[ajshoe]

Re: Samsung PN63C8000 has sound no picture

main board is bad - has bad gamma chip. my recommendation is to send main board in to NICKS tv repair - I've had good success with this repair. Have a couple of these exact sets and still working. Be careful when removing LVDS cable - lift tab then remove LVDS cable gently

[nwcs]

Re: Samsung PN63C8000 has sound no picture

Just what I suspected. Thanks for the quick reply and I have used Nicks several times and have always been happy.

[nwelec]

Re: Samsung PN63C8000 has sound no picture

Just an update, I received two used (supposedly tested) main boards and still same issue. I talked to Nick's TV and he does not think it is the main board so I am now not sure what to do next. I guess I might wait for Shop Jimmy to get one in. I am able to do the RGB tests like I mentioned just fine other than the white background test it has red sparkling in the picture.

[nwelec]

Re: Samsung PN63C8000 has sound no picture

Just thought I would provide an update. After getting third used main board it is now working. But it was not the main board but the cable that runs between the main and the logic main. I guess it was bad. The last board I got had the cable with it and the rest is history.