Sanyo DP50747-01 no video or sound?
I’m posting this new thread hoping to see the light after a dark tunnel..!
This Sanyo TV had a problem with shutting off after a few min. I did a visual inspection on the main P/S and found 9 caps (3300mf 10V) bad (the top popped). These were replaced and fixed the original symptoms of shutting the set after a few min.
We connected the set to the cable box and everything looked fine, except the video started to blink only on HD channels, regular non-HD worked ok. After a few days the video was gone and same with the audio.
Back on the bench, a visual inspection shows the previously replace caps were fine. Testing the voltages at the connectors low voltages 5v, 3.3v, 24v etc all test fine. The only connector with no voltages is CN206 stencil with Vs, Gnd, and Va. This connector extends over to the left side board; I believe this to be the YSUS board.
I replace all 6 power MOSFET transistors SD20N60, just a wild shoot on the dark, still no voltage at the Vs and Va connector.
The PDP Service Manual I've found on a different board show Vs to be 188v-198v and Va to be 56v-61v. Without a P/S manual I’m at a lost trying to trace the path for either source.
The P/S part # stencil are YPSU-J013A and LGE PN:AAX30284301.
Any help with a P/S service manual or possible solutions is appreciated it.