Panasonic TX-P42ST30 with exploding diodes....

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  • Moreno83
    Badcaps Legend
    • Jun 2014
    • 2008
    • The Netherlands
    #21
    Re: Panasonic TX-P42ST30 with exploding diodes....

    No , black and red prope both on white prong connector. One way it will beep for 1 or 2 seconds. Other way around it won't beep.

    A shorted board will beep constant.
    I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

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      • tvtimmy
        Badcaps Legend
        • Mar 2015
        • 1160
        • usa
        #22
        Re: Panasonic TX-P42ST30 with exploding diodes....

        It will beep for about 2 seconds. Then if you reverse the meter leads it will beep for 2 seconds. If it stops beeping both ways, thats a good start. Dont forget to reflow all the screw hole grounds!

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          • Moreno83
            Badcaps Legend
            • Jun 2014
            • 2008
            • The Netherlands
            #23
            Re: Panasonic TX-P42ST30 with exploding diodes....

            As Tvtimmy said , both side beep is not good. A good board will beep shortly on 1 side and no beep on the other side. ( black/red propes ).
            I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

              Comment

              • satinser
                Badcaps Veteran
                • Oct 2012
                • 214
                • uk
                #24
                Re: Panasonic TX-P42ST30 with exploding diodes....

                I take it you've tested for short across C842. If present at least one of the buffer chips will be shorted. This I believe also can cause the demise of the trio of SMD diodes D430, D432 and D433. In my case thats exactly what I found buffer chip IC4806 blown and that Grey stuff that Panasonic put around the buffer chips is awful to remove!

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                  • ReeceyBurger123
                    Never Give Up !
                    • May 2014
                    • 7325
                    • Britain
                    #25
                    Re: Panasonic TX-P42ST30 with exploding diodes....

                    Our old friend flocko knows a good method of easily removing the buffer silicon on panasonics
                    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                    https://www.facebook.com/Telford-Tel...7894576335359/

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                      • Moreno83
                        Badcaps Legend
                        • Jun 2014
                        • 2008
                        • The Netherlands
                        #26
                        Re: Panasonic TX-P42ST30 with exploding diodes....

                        I found a solution for the exploding diodes on a TNPA5330 AB board.

                        Common failure is that after replacing the 6 FETS ( Q401/402/403/421/422/423 ) the diodes D433/432/430 will explode. The 2 small resistors ( 40K Ohm ) will give a high value or will read short.

                        The reason is fake parts! I replaced all fets with FGD4536 and replaced the diodes + resistors from a scrap board but it still blew up.
                        I found out that both DG302 were also short. One is located on Q441 ( Under heatsink and will read short on both legs ) and the other is Q451 which will read short on 1 leg. Well atlas in my case.

                        I replaced all parts including IC502 + Q531 with original parts and the board is back alive. Watch out that there are fake DG302 / RF1501 / 30F131 and RJP30H2A on ebay!! If the logo is almost gone using nail polish remover then you might have fake part.....

                        Hope it helps someone.
                        I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                          Comment

                          • matyka
                            Senior Member
                            • Jan 2015
                            • 179
                            • Uk
                            #27
                            Re: Panasonic TX-P42ST30 with exploding diodes....

                            Hi,anyone could help me to fix my tnpa5330 board .I have removed all the shorted Fets .
                            I have shorted diode near the Buffer IC. See photo
                            Is this would be normal ? I have measured out the board and are all Ok .
                            Attached Files

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