Question about Mitsubishi VS-50605 50" Rear Projection Television

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TV problem I left the tv pluged in while I was gone and it is dead again now. Same readings of 15.8 vdc on pin 4 of IC951 and 1.7vdc on pin 1 of same IC. Is there something that would be taking out IC951?REDCAT55

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  • Mitsubishi Master
  • 8,617 Answers

Let me go over the schematics and I will post what i can find that maypossibly keep taking out the IC

Posted on Mar 02, 2008

  • Sonny Berry
    Sonny Berry Mar 02, 2008

    Go over the schematics and lift one leg of every diode that are feeding pin 1 of the ic and also pin 4 one of those diodes must be leaky or its the regulator down circuit, pull the regulators associated with the IC and test out of circuit.

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1 Answer

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Over Current Protection
Pin 1 of IC951 is also the Over Current Protect input.
The internal FET.s ground return is at pin 2 of
the IC. The voltage drop across R955 and R956
indicates the FET.s current, and is coupled through
R953 to pin 1 of the IC. The Over Current Protect
circuit is activated if the voltage at pin 1 of the IC
exceeds 1.35 volts.
Stabilization and rough regulation are provided by
feedback from pin 3 of T951 to pin 1 of the IC. Fine
regulation feedback is from a secondary supply,
through the Photo Coupler, PC951, to pin 1 of IC951.
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1 Answer

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