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Panasonic Plasma HDTV Model No. TH-42PZ80U GPF11DU Chassis:I'm a tech with SM for this gem. When powered up, blink code of 2 per cycle. Manual suggests 15v SOS problem on "D" Board. I have replaced D Board. No change. On initial powerup, fans run ~2 seconds. Watching 15V (P) line, 15v is not achieved and voltage present collapses. Other voltages can't be checked, as circuit goes in to shutdown. Can the power supply run unloaded for test to rule out SOS line failure in other "boards"? "A" board has also been replaced.

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  • electrepair Sep 30, 2009

    Are we talking about the same unit? The 4 fans on this unit are mounted at top for heat dissipation of all boards, to include HV drivers. Have you had experience with Panasonic Plasmas with similar problems? Are you working w\ a service manual?

  • electrepair Oct 10, 2009

    As stated in initial post, the unit will not power up long enough to measure the all the supply voltages. Do these supplies fail frequently? What about the HV drivers? Is there such a thing as a dynamic short? The indicators on SS & SC boards are not lit. Are there other indicators that should be monitored?

  • electrepair Oct 10, 2009

    With system monitor lines open, power supply will not turn on. No relays cycle. unit completely dead. Please remember the power supply monitors SOS status of all the derived supplies in the supply. That's why I can't make it run long enough to isolate the problem area.

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There will most likely be a cold solder joint under a board,that you haven`t replaced,that holds,and connects a heat sink to the board.Just clean,and re solder the joint.Hopefully,this helps you,but nearly all the projections have this problem a some time.The robots at the manufacture make these mistakes. I hope this is some good.

Posted on Oct 11, 2009

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Hi,
Problem is with excessive drain or short on another board fed by this PSU. Should be able to run this with other boards disconnected. Reconnect items untill faults reappear. Replace defective board when isolated unless you have expected current draw information for relevant boards.

Posted on Oct 10, 2009

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Watch the power supply voltage during start up. Verify all voltage levels are correct and steady. This happens when a bad solder joint is present, trying to pass current. Focus on the power supply voltages during loading.

Posted on Sep 30, 2009

  • Craig Butler
    Craig Butler Oct 10, 2009

    I would try to unhook all the load connectors coming from the power suppl board. Then test all the voltage levels. Hook up the load connectors one at a time and watch the power board for reaction.




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NO the power supply run cannot be unloaded for test to rule out SOS line failure in other "boards".its not possible. check out the fan getting hot at its base where the connection is.it should not get hot.if its getting the connection is getting overheated on the board.check out.thanks.keep updated.

Posted on Sep 29, 2009

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