Lg50pg3000 not working

[Ballvalve]

Mt tv packed up on Christmas night so I decided to take it apart today.
I was watching it and then it just went black.i have taken out the top buffer and the bottom of the screen now comes on but if I press menu nothing comes up.
I am going to change buffer pcb but is there anything else I should look out for
Any advice
Cheers

[tom66]

Re: Lg50pg3000 not working

Can you supply pictures of the circuit boards in the chassis? Buffer board failure is particularly common on these sets.

[Ballvalve]

Re: Lg50pg3000 not working

Here is pic one

[Ballvalve]

Re: Lg50pg3000 not working

Pic two

[Ballvalve]

Re: Lg50pg3000 not working

Pic three

[Ballvalve]

Re: Lg50pg3000 not working

Here is the buffer board I took out

[tom66]

Re: Lg50pg3000 not working

OK, top left of plasma panel (https://www.badcaps.net/forum/attach...2&d=1388265614), there is a sticker, marked: MODEL: PDP50K1##### (for example) What does your say?

[Ballvalve]

Re: Lg50pg3000 not working

Pdp50g1####

[tom66]

Re: Lg50pg3000 not working

OK, the manual for your plasma module (note: not TV, but the screen inside the TV with all the boards) is here, search for 50G1 to find the right page:



With both buffers installed refer to the test points for Vsc and -Vy and confirm if the voltages are good.
Then remove one buffer at a time and see if a voltage returns, if it is missing.

You must use a digital meter and make sure to unplug the TV for at least 30 seconds before making -any- connection change.

[Ballvalve]

Re: Lg50pg3000 not working

Do I test these test points to earth and what voltage should I get. I have a fluke meter so should be able to test them

[tom66]

Re: Lg50pg3000 not working

You measure -across- the points indicated with the black and red as specified.

[Ballvalve]

Re: Lg50pg3000 not working

I have 154dc across by and 135 across vsc with the top buffer out.
I have no voltage with across them with top buffer in place

[tom66]

Re: Lg50pg3000 not working

154V? Are you sure? Not 194V?
But yes looks like top buffer is bad.

[Ballvalve]

Re: Lg50pg3000 not working

Ye defo 152 v dc .
Can I adjust this to 195vdc

[tom66]

Re: Lg50pg3000 not working

Just to make sure are you testing across the resistor marked Vy? If so yes try adjusting it up although I would not expect this to restore picture.

[Ballvalve]

Re: Lg50pg3000 not working

It will only turn up to 154vdc.hopefully if I get a new top buffer board it'll work .
Cheers for the help