Re: Dell W4200HD repair

Turns out he was right. So it required both the main power board and the auxiliary to work... Bizarre.

Re: Dell W4200HD repair

I bought a 2nd power supply board and it didn't work either. Doesn't output high voltages if targets unplugged. Took the set to a repair center. He tried his power board and same result - no HV. So he says it is the auxilliary smaller PS board but didn't have one to try. I bought one off ebay and it is on its way - but I have my doubts....

Re: Dell W4200HD repair

I had tried the 2nd board completely installed and the resistor fried. I sent that back for a refund. The original board has the new caps and no known bad components but no VA etc. I'm hesitant to try another ps board.

I've been trying to repair a neighbor's plasma set. The power supply board LJ44-0068A had bad (leaky) electrolytics 1000uf 250V and 330uF 450V. I replaced them but still bad - hear relay click on remote ON press, no VA or VS supplies. I bought a replacement PS board off ebay. Tried it and still no VS or VA. Discovered a blown F8003 fuse. Replaced it and tried it. R8009 got red hot and cracked. Fuse still good. Now I don't know if the ebay board was bad from the start. Why no VA or VS supply output? Was I supposed to try the new board with loads unplugged first for good VA/VS?

I have this Akai set. Supply voltages good. Two mylar caps were bad on supply but fixed and no change (very dim display, no sound). Most I've read says Ysus and maybe buffers bad. What are some voltages for the Ysus that I can verify? Like there are connects to the buffers with I think it was -38V/7V. Is this correct or way out of line? Can't find a schematic (LJ41-01192A).

Re: 50" LG Y-sustain IPM modules

Arrgghhh.
Got terms Zsus and Ysus mixed up.
Zsus seems ok, cool IPM looked fine. 18V=18V.
Bad IPM on Ysus = YPPD-J015B. 18V=16.3V with both IPMs off the board.

Re: 50" LG Y-sustain IPM modules

I have read some conflicting information regarding the 18V supply on the Zsus board - whether or not on this board it should actually be 18V. I have both IPMs out of the board. The 18V on the board still reads 16.xV. Did they decide to run at a lower voltage or is the DCDC converter or caps bad on my board?

Also, if one IPM was blown on my Zsus, is it a good chance a Ydrive/buffer board is bad as well? One IPM on the Ysus ran cold other hot before I discovered the bad IPM on the Zsus board. I pulled the cold one and it was fine....