Panasonic TX-P42ST30B the 'ol 6 Blinks

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  • foxyUK
    Member
    • Jan 2018
    • 35
    • United Kingdom
    #1

    Panasonic TX-P42ST30B the 'ol 6 Blinks

    Got rid of 7 blinks by changing the usual 6 IGBTs and the FETs & Fuse on the P board that always seem to go on the 42's.
    Changed IC502 which was dead, but not Q531 which diode-checks OK.
    First look at the 6-blinks, found Q441 suspect (not short, but lowish resistance) so tried an FGD4536. Mid voltage 190v... no good. Salvaged a DG302 from a spare SS board and still 6 blinks, but Mid is now 85 volts (a bit low) until the point where shutdown is initiated, and then it instantly shoots up to around 200v....is that normal? (Given that at the moment I don't know why it is shutting down).
    The green LED on the SN illuminates briefly, but not the one on the SS, and no fan start.
    15v, 5v, Vscan, Vad, all normal.
    I have a 100w lamp in the Vsus, but it's hitting 215v OK.
    Is there a way to confirm it's the SN board without disconnecting C20 from the C2 board as described in the troubleshooting flowchart (which looks to be inaccessible)?

    Thanks
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Panasonic TX-P42ST30B the 'ol 6 Blinks

      Do you have access to a scope? Preferably a digital one?
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • foxyUK
          Member
          • Jan 2018
          • 35
          • United Kingdom
          #3
          Re: Panasonic TX-P42ST30B the 'ol 6 Blinks

          Unfortunately I don't have access to a 'scope, and I only tinker with these series 30 plasmas because I learned how to fix the SC on one for my own use and they seem to crop up regularly in my local area, so have done four 50" models. The 42" seems to be a bit more of a nuisance!
          I realise that my dmm with Min-Max is not fast enough to catch all that is going on with MID properly. I'll change the other DG302 just in case, and maybe Q531 that measures OK with diode check but may be different with higher voltages?

            Comment

            • foxyUK
              Member
              • Jan 2018
              • 35
              • United Kingdom
              #4
              Re: Panasonic TX-P42ST30B the 'ol 6 Blinks

              Okay.... got there.
              It was the other DG302, Q551. Strange devices these! In circuit the resistances were not deeply suspect, and diode check gave fluctuating results, which was odd. Tested properly out of circuit, the device was fully conducting with low voltage and hardly conducting at all at 5-6v, pretty much the inverse of normal operation.

                Comment

                • budwich
                  Badcaps Legend
                  • Jul 2015
                  • 3097
                  • Canada
                  #5
                  Re: Panasonic TX-P42ST30B the 'ol 6 Blinks

                  good to see / hear you found the issue. gives me some hope to go back on my board and recheck those dg302s as the power up / mid voltage was similar.... maybe.

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