lg 50pt350-ud goes on and off picture

[mattstolte]

ok have this plasma of my girlfriends and worked fine then it started picture would go out and screen be black but sound was still on and then would click back, then on and off same way but we also realized then when we had the cpu hooked up to hdmi watching movies it would freeze then play then freeze thought it would be ymain, but then with the picture freezing not sure could it be main or digital main?

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

any help please?

[Hamie]

Re: lg 50pt350-ud goes on and off picture

Connect the 2 holes marked EXT_AUTO_GEN
On the control board with a piece of wire, paper clip etc.


Disconnect the LVDS cable to the mainboard.

You will get test patterns on screen, let them cycle and see if the fault occurs.
If it doent your mainboard is the likely culprit.

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

hamie I don't have that on my main. here is what is on my main

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

ok it seems the picture goes on and off after it warms up alittle picture will come and go but sound will stay on, im not to sure what the little light on the tcon board is for? but t blinks then it will stay on then stay off its a little green led light. its in this picture, then I noticed the middle heatsink on the ymain is pretty warm not too warm where you cant hold your hand on it, just warm. but the tv is weird like the picture will go out stay out for a min then come back for ten then go out and such, I was wondering what that little green light is for on the tcon or digital control board

[Hamie]

Re: lg 50pt350-ud goes on and off picture

You do have it you've read my post wrong.

Control board is the small green board in the middle of the TV.

I can see the test points in the photo you've uploaded.


After connecting the 2 holes, disconnect the LVDS cable (the cable that connects the MAIN AV Board to the control board)

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

ok hamie im doing this, am I suppose to let it stop at some time or what do I do? do you mean for me to just let this keep cycling to see if the screen will cut out?

[Hamie]

Re: lg 50pt350-ud goes on and off picture

Yeah if it's not affected then the mainboard is almost certainly causing your fault.

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

Couldnt be ymain?

[Hamie]

Re: lg 50pt350-ud goes on and off picture

If the test patterns run fine then the y-main shouldn't be the problem.

Possibly it's bad solder joints under the mainboards processor.

[mattstolte]

Re: lg 50pt350-ud goes on and off picture

Well got new main today that didn't fix the problem