LG Plasma 60PV250

[tw2005]

I don't have this set but a friend has asked me what I thought this could be in the photo. (Pinks areas)

I'm thinking ZSUS, but looking for opinions as it's hard to be sure since I can't check this out.

[mmartell]

Re: LG Plasma 60PV250

Bad joints on the coils ?

[tw2005]

Re: LG Plasma 60PV250

Bad joints on the coils ?

are you talking from your own experience?

I guess since the TV is still running and the picture so,so it's not blown or shorted transistors, is that a safe assumption.

I did have a quick read of some other threads and sounds like bad coils or shorted out seems to be the 2 common ones.

[jwarnes]

Re: LG Plasma 60PV250

Ok I have one of these with this problem too. Only its so bad that it goes totally black in some parts.
IM thinking Z sus not charging the panel properly?
It works fine when it starts up and then gradually goes this way as it warms up.
About a year ago this tv had the usual fault, with the bad solder joints on the inductors and it shorted out the 6 mosfets that work off that area of the board, so I repaired that by changing out all six. Worked great for 12 months. Then this problem came along. It seems sort of different.
Checked the inductors they are still great. Mosfets are ok, however I am thinking, Do I have to actually remove at least 4 to accurately determine their condition? (as they are connected in parallel)
Or is it a case of, if they are not shorted...they are working fine?
And if anyone knows, what voltage is expected at the output to the panel from this card?
and which part controls this section of the tv, and which part could be operating incorrectly as it warms up, causing this voltage to drop?
I have not yet taken out the mosfets and not yet measured the output voltage as I want some other technicians here who may be familiar with this to put in their two cents worth. Really value other peoples knowledge and opinion a lot.
I know you cant get this board anymore, so I am hoping I can save it or I will have to bin the whole tv. (yet another one!)
pics attached showing the fault after the tv has warmed up.
I also changed all the caps on the z sus board and the power supply board, except the large high voltage caps (which usually are ok in my experience)
all the small or low voltage caps were changed. Nothing changed in its operation after that was done.