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PLASMA TVS DONT HAVE INVERTER CIRCUITS. YOU MOST LIKELY HAVE A Y-SUSTAIN BOARD FAILURE. IT IS THE BOARD TO THE LEFT LOOKING FROM THE BACK. THE LARGE ALUMINUM HEAT SINK LOCATED ON THE BOARD AND THE PART SCREWED TO IT WILL BE THE DEFECTIVE PART.
If you unplugged the Ysus board, then you need to replace the Ysus board, or both sustain boards. This is the part: The part is often available on Ebay, or from manufacturer. Look also at Vance baldwin or Partstore. To do a good job the Sustain boards should be tested by a tech , following service manual. It is almost for sure sustain board by the way.
Call Sanyo. The 800 number is on your remote. Insist on talking to a supervisor and you may get somewhere. I had to do this and Sanyo called today to tell me to take my tv to the shop. They are paying for parts and I have to pay labor to get it fixed. Repair shop said $35.00 to look at the set and if it's just to boards that need to be replaced, it wouldn't be too expensive. We'll see.
Sanyo told me they haven't gotten many complaints on this tv, DP42746, 42" Plasma. You guys have to call them and complain.
This is usually caused by a dry joint on the vertical driver board or ribbon cable. Remove back panel and run your fingernail or an insulated rod (chopstick) along the contacts until the bars go away, then resolder the joints.
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