PN42B430P2DXZC Audio No Pic Voltage good

[paulstef]

Re: PN42B430P2DXZC Audio No Pic Voltage good

Run test patterns by jumpering pins 3 and 4 on logic board test header.

It's not the Y-main or X-main or power supply.

It can only be control board, panel, or main board. If test patterns still have same problem, it is panel or control board.

Thanks Tom.

Unfortunately the problem persists. I do have a board form a 50" TV and I was wondering if I try to swap the flash memory. the sticker on that memory seems to be the only visible difference between the two boards... but then who knows if the main processor contains the same firmware

EDIT: took the flash memory from the suspect board and soldered it on the 50" TV board, same thing as before. So I'm not one step further as it could even be corrupted data in the memory chip maybe I just replaced ? :-)
If it's the panel... then what on the panel? so weird

[tom66]

Re: PN42B430P2DXZC Audio No Pic Voltage good

If it is the panel it will be the address drivers that are bonded to the glass and are not serviceable.

[paulstef]

Re: PN42B430P2DXZC Audio No Pic Voltage good

Believe it or not, I just replaced the whole Y-mains + buffer unit and the picture came on ok. I will post an update if I happen to find the problem on the Y...

[paulstef]

Re: PN42B430P2DXZC Audio No Pic Voltage good

for everybody else with the problem, it's located on the Y-buffer. (LJ41-060109A)

no overheating of individual buffers, no shorts, no burnt components but replacing the board with a known working one solves the problem