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plasma Panasonic ''P-Board'' ETXMM655MEH , Trying to investigate

Discussion in 'Troubleshooting and Repair' started by Jeffpepin, Nov 16, 2012.

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  1. Jeffpepin

    Jeffpepin

    13
    0
    Nov 15, 2012
    he !
    i have a panasonic viera ( TH-50PX75U) dead since 2 month , This is for sure a power supply faillure because i have perfectly analysed the circumstances of the death ,

    the tv sudend shut down , 10 blink Sos ( standby led) =no power '' all output voltages'' ,
    Un/repluged it , hear the first relay cliked on , but it goes off ,ckik on immiadely then clik off .

    Example :
    ON ( 1sec)OFF(1/2sec)ON(1/4sec)OFF(1/8Sec)on(1/16Sec)Off ..... no more suffisent voltage to drive a relay.

    After that , no more signs of life , no led , i have tested all troubleshoot guide and all results refer me at P-Board
    -------------------------------------------------------

    ETXMM655MEH ( live circuit)

    i need help ,Fuses are Ok , thermals resistor on transfo are ok ,no traces of burn, what next ? mosfet? , im just not sure where begin ,

    For sure , it have +/- 30 000 other persons in this situation . if it have succes .. not just me will be happy to rescue ther tv

    the schematic are here TH-50PX75U-Service-Manual
     
    Last edited: Nov 16, 2012
  2. Jeffpepin

    Jeffpepin

    13
    0
    Nov 15, 2012
    update i check all ic on the board ( mosfet rectifier .. ) im here :
    <
    test in diode mode with fluke 77 III multimeter

    q352= 2sk2510
    Q351= 2sk2510
    SWITCHING N-CHANNEL POWER MOS FET

    first one
    With - on B return an infinite resistance on C. and .476 on E.
    if i put + on C then E ,E will be .000 then slowy up at .476
    With + on B REturn Infinite Both C AnD E

    Second
    With - on B return an infinite resistance on C. and .456 on E.
    if i put + on C then E ,E will be .000 then slowy up at .456
    With + on B REturn Infinite Both C AnD E
    ----------------------------------------------------------------------------------------------------------------

    D353 = Yg805c06
    D351 =Yg805c06
    SCHOTTKY BARRIER DIODE (60V / 20A TO-22OF15) - Fuji Electric

    First one ,
    With - on B return .130 on C. and .131 on E.
    With + on B REturn Infinite Both C AnD E
    Infinite Between C and E Both side

    Second ,
    With - on B return .125 on C. and .126 on E.
    With + on B REturn Infinite Both C AnD E
    Infinite Between C and E Both side too


    ----------------------------------------------------------------------------------------------------------------------------

    D403 : Yg901C3
    LOW LOSS SUPER HIGH SPEED DIODE - Fuji Electric

    With - on B return .362 on C. and .362 on E.
    With + on B REturn Infinite Both C AnD E
    Infinite Between C and E Both side too

    -----------------------------------------------------------------------------------------------------------------------------

    Q401 : 2sk3607
    N-CHANNEL SILICON POWER MOSFET - Fuji Electric


    With - on B return infinite on C. and .498 on E.
    With + on B REturn Infinite Both C AnD E
    Infinite Between C and E Both side too

    This one look Strange because any side i test it ill get infinite between base and collector ?? .
    if anywone can confirms if my reading seem to be good
     
    Last edited: Nov 17, 2012
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