LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

[Michale32086]

I have a 60" LG Plasma, 60PB6650....

Upon power up, a Power PCB relay clicks, the screen flashes and then nothing. After a few seconds, the process repeats...

I get good voltages (VS 207v, VA 55v) at power up/relay click... Then voltages start to drop and then back up on the subsequent power up/relay click..

Thinking X/Z Sus, I replaced that board...

Still no go.. Still nothing but screen flash and relay click...

X-Sus, Control Board or Main??

[Hamie]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Test patterns?

[Michale32086]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Test patterns?

Yes, please.

Sorry, couldn't resist..

How would I call the Test Patterns??

[tom66]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Here, test pattern... here boy...




...


Jumper EXT AUTO GEN on control board, (two holes)
Disconnect LVDS from control board side.
Apply 120 volts to plug.

[Michale32086]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Here, test pattern... here boy...

Ahhh I see.. You got jokes..




...

Jumper EXT AUTO GEN on control board, (two holes)
Disconnect LVDS from control board side.
Apply 120 volts to plug.

Ahhhh That's right.. It's been a while..

[Michale32086]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Yep, I get the test patterns. Gray, Red, Green etc etc...

[tom66]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Main board dead then. Or LVDS cable, but that's very rare. Replace the main. 50" 1080p one should be okay. 42" one is not.

[Michale32086]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Main board dead then. Or LVDS cable, but that's very rare. Replace the main. 50" 1080p one should be okay. 42" one is not.

Awesome sauce..

Thanx for the assist, guys...

[Michale32086]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Main Board replaced..

TV works like a charm...

Thanx again...

[EchoEleven]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

Sorry to bring up an old post, but I just had the exact same thing. I followed this thread and decided I needed a new main board. I ordered a new main board from a supplier and installed it, now the TV does come on, but sometimes get stuck on the boot screen, and sometimes after about 2-3 minutes will go to the HDMI input. Sometimes buttons on the remote respond in about 10 seconds, and sometimes not at all. I have not attached a device to see if picture will play until I resolved this issue. I was thinking something happened to the software? But then again a few times when I hit "Input", after it waited for about a minute, it would bring up the Inputs screen like normal, but you cannot move the box to select anything. The only button on the remote that works correct is the power button, it will turn it off and on just fine. Any ideas? Any help would be much appreciated. I also downloaded the .epk file to a usb to try to update the software but it does not act like it recognizes the stick.

[tvtimmy]

Re: LG Plasma 60PB6650 Screen Flashes, No Display, Good Voltages

You received a bad mainboard. It needs a re-balling or at least a re-flow.
See if you can return it for another one.