Question about Mitsubishi VS-50605 50" Rear Projection Television

1 Answer

Mitsubishi Vs-50605 TV dead

Won't come on with power button or remote- no blow fuses that I can find- has power to pwb- need help with this model

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  • REDCAT55 Feb 16, 2008

    I know problem is in power supply. Just need help trouble shooting. REDCAT55

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  • Mitsubishi Master
  • 8,617 Answers

First thing on a Dead VZ7 to check is the solder connection at the yokes "DY" Connector. Then Check C411 2200uf @ 35V
Then C412 10uf @50V. Then Check IC700 Pin 20 for 0VDC any voltage other than 0VDC on that pin means Diode D980 is leaky.
Hope this helps. If you need anything further let me know.

Posted on Jan 26, 2008

  • Sonny Berry
    Sonny Berry Feb 16, 2008


    Some key points

    to remember when troubleshooting are:

    1) It requires 16 VDC at pin 4 of the IC951 to start

    the oscillator.

    2) Q975 provides Soft Start Protection, applying

    some positive voltage to pin 1 during

    initial start up.

    4) If pin 4's voltage drops below 11.5 volts the

    oscillator shuts Off.

    5) If the voltage at pin 4 increases above 22

    VDC, the internal Over Voltage Protect

    circuit shut the oscillator Off.

    6) If the voltage at pin 1 reaches 1.35 VDC, the

    Over Current Protect circuit disables the

    oscillator.

    7) A clicking sound indicates the IC is probably

    defective.

    8) A chirping sound usually is caused by an

    excessive load on the Power Supply.

    Excessive load on the Power Supply is usually caused

    by a high current component in the TV, such as the:

    . HV Output transistor

    . Horizontal Output transistor

    . Audio Output IC

    . Convergence Output ICs.

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