Lg 50pq3000 sound ok but no picture

[Cobblers]

Ok so i have this plasma that has no picture. Ive checked all the fuses i can see and voltages on the y sus and x sus.
Y sus voltages.
Vs 192.4v
Va 60.1v
Vsc 134v
Vy 185.2v

X sus.
Vzb 79.8v
Vs 192.4v

If tou need any more information or in depth photos of a paticular board let me know

[ReeceyBurger123]

Re: Lg 50pq3000 sound ok but no picture

I have a full set of boards for this Tv which im willing to sell cheap. Disconnect the Lvds cable and jumper the auto gen test pattern pins on the control board then turn the Tv on see if you get test patterns on the screen.

[Cobblers]

Re: Lg 50pq3000 sound ok but no picture

Ive had a look i cannot see any jumpers? Im looking at the control board the 50g2_ctrl. In the service manual it says you need the service remote to do the test patterns. It says if the voltages are all good i need to move onto the control board and check the crystal the led and some other voltages. I dont have the led lit on the control board.

I am interested in your boards though. I also have a lg 50pq6000 that i my own tv are they compatible with that too?

[ReeceyBurger123]

Re: Lg 50pq3000 sound ok but no picture

Give it a try, should be. I had a 50PQ3000 which the image was messing up and it was also the crontol board so possibly the case here too.

[Hamie]

Re: Lg 50pq3000 sound ok but no picture

If you apply pressure to the control board bga does it work?

Had one of these recently, all voltages correct; but no led on control board. Turned out to be cracked solder joints.

[Cobblers]

Re: Lg 50pq3000 sound ok but no picture

I bought a control board plugged it in and it all worked fine. I decided to do a bit of resoldering on the sustains before i repaneled it up and i seem to have broken it. That'll teach me to mess about here a photo

[dick_barton]

Re: Lg 50pq3000 sound ok but no picture

Take a good look at what you have already done and check that any cables you removed have been reseated securely and that any solder joints you tidied up are not bridged across to other joints.

[Cobblers]

Re: Lg 50pq3000 sound ok but no picture

I had a really close look i only resoldered thing attached to heatsinks none of the smaller things. The only thing i noticed when i took the board out was that the little rubber insulator block or whatever it is had moved out of position. The ident on the board has a thin line to show where the heat resistant strips and the block should be positioned. The block was nearly entirely out of position. Are them blocks ever known to become conductive? It seems quite damp and sticky too touch.

[Cobblers]

Re: Lg 50pq3000 sound ok but no picture

Reinstalled and faukt still there. From the photo of the screen where do you all think i should be looking? Voltages are all still good same as before except maybe the vs is a little low at 192.2 when it should be 193.