I seem to have same problem as everybody else with my HP PL4260N - i.e. a loud pop thereafter audio fine but no picture. Found one 4A fuse each blown on BOTH the YSUS and the ZSUS board. No evidence of obvious physical damage anywhere in TV. Quick resistence check on power inputs to both boards shows high resistence between VS and GND on YSUS but on ZSUS VS and GND looks shorted. Any advice on what to do in this situation? Is it possible that JUST the ZSUS board failed and somehow caused fuse to blow on YSUS as well, OR is it more likely that BOTH boards are bad at this point. If anybody has experience with this I sure would appreciate hearing back from you.
THANKS VERY MUCH - Mike Z
The part that caused the fuse to blow is the hybrid that is mounted underneath the heatsink on the YSUS and ZSUS boards. The part used on these boards might be YPPD-J017C or YPPD-J018C, in about 90% of the time, replacing these hybrids fixes the plasmas with no video but good audio. Since VS and GND is shorted, that means that the hybrid has shorted internally. Most service techs would rather replace the entire YSUS or ZSUS boards since the hybrids are very difficult to remove.
Let me know if you require further assistance.
Testimonial: "Appreciate the good info and quick reply. THANKS VERY MUCH"
Since the ZSUS board created a high current when the hybrid became shorted, it blew the fuse on the YSUS board since the current was higher then 4 amps, that is why the fuse was blown. If you are able to find both boards, it might be the best way to go to avoid surprises in case that the YSUS might have been affected by the ZSUS shorting out; is unlike but possible.
Let me know if you required further assistance.
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I had the same problem. Another site recommended sending the Y-sus board to PTS Electronics in Indiana. I called them, sent the board, and they refurbished the board and sent it back for $122.
The board seems to work, as I now have some picture - but only on the left half of the screen. I now have flickering stripes on the right half of the screen. Anyone know if there are some POTs that need adjusting or something, and if so, which ones?
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VS and GND do NOT appear to be shorted on YSUS board, yet fuse was blown on that board too. Could that be result of ZSUS board failure or is YSUS likely blown as well? Is it recommended that BOTH YSUS and ZSUS boards be replaced at same time?
VS and GND do NOT appear to be shorted on YSUS board, yet fuse was blown on that board too. Could that be result of ZSUS board failure or is YSUS likely blown as well? Is it recommended that BOTH YSUS and ZSUS boards be replaced at same time?
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