Question about Mitsubishi VS-50605 50" Rear Projection Television

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TV problem Voltage at pin 1 of IC951 is 1.7 vdc. Voltage at pin 4 of IC951 is 15.8 vdc. Does that tell you anything? REDCAT55

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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.
Its possible that Diode D953 is leaky allowing the voltage to rise on pin 1 of the IC

Posted on Feb 23, 2008

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2. Vertical Beam Blanking Active, check PIN 4 of IC401 for 3 VDC. If missing check IC202 (5V REG) PART # 266P932010, on The SIGNAL PCB.

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TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
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  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

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1 Answer

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Mar 02, 2008 | Mitsubishi VS-50605 50" Rear Projection...

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1 Answer

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1) Unplug the AC cord.
2) Connect a 100 Ohm resistor (R) between
pins 4 and 5 of the IC951. This discharges C960
that may still be charged if the Over Voltage
Protect circuit was activated.
3) Remove the 100 Ohm resistor and apply
power to the set.
If the problem still exists, the IC is probably defective.

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1 Answer

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