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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Toshiba 50h60 tv has power but no picture


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Now, take a look at the power supply circuit either in the owner's manual (if it is supplied) or on the lid of the power supply in the HD TV itself (warning, only open this device if you are familiar with and comfortable with working with voltages and a DC volt meter) and you will see at low-amperage circuit -- in the 1 to 5 amp range -- and a high-amperage circuit -- up to 20 amps. This is the important circuit because it drives the TV.

You will have to go into this device while it is on, so extra careful that you stay away from the AC input. You can look at the DC output because it is low-voltage.

Placing the probes of a volt-meter (in the appropriate range setting) across with the black (-) lead to ground and the red lead on the high-amp positive lead, measure the voltage. You should read 13.8 VDC or a similar reading. If you do not see any voltage on this terminal -- which I suspect the the case -- then you will have to replace the power supply. If you feel comfortable handling this repair, you can do it yourself. I would suggest taking it back to the store where you bought it and have them fix it -- to keep the warranty intacty -- or have them send it back to the manufacturer.

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Dear dc_rock,
These the most common failures for this TV Model VS-5043- VZ3:

1. Check base bias Voltage of Q217, for 0 VDC (BIASED OFF) if .7 VDC (BIASED ON) check C268 (22 UFD 50 V) off C OF Q215 V-Protector on the SIGNAL PCB.

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.

3. Check Pin 6 of IC200 for 9 VDC if low or missing check IC203 Part#
270P210010 on the SIGNAL PCB.
Thanks for using FIXYA, big IRISH.

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Good Day, petterk;
Try resetting TV by unplugging from the A/C outlet for3 to5 minutes. This a 1994 Model, you can't new boards from Mit's. Try this:
1). CHECK FOR 1200 VDC AT PIN 1 OF CONNECTOR "DK". IF LOW OR MISSING CHECK R5D9 100 OHM 1/2 OFF PIN 1 OF THE FLYBACK ON THE MAIN PCB. 2). CHECK IC401 PIN 8 FOR 28 VDC IF MISSING CHECK R510 1.2 OHM 1/2 W OFF PIN 5 OF THE FLYBACK. IF OPEN IC401 PART # 272P239050 MAY BE SHORTED. BOTH ARE ON THE MAIN PCB. 3). CHECK FOR SHORTED OR LEAKY Q2H0, IF BAD APPLY FOLLOWING CIRCUIT CHANGE TO CORRECT. ON FOIL SIDE OF PCB-SIGNAL, SOLDER A 1S2471 DIODE CATHODE TO BASE OF Q2H0 AND ANODE TO EMITTER. LOCATED ON PCB-SIGNAL AT IC201 PIN 2. PT # 264P045040 AND REPLACE Q2H0 PART # 260P559030. 4). CHECK C2H1 100 UFD 35 V C2H2 1 UFD 50 V AND C2H3 47 UFD 35 V OFF OF Q2H1 IN THE SPOT KILLER CIRCUIT ON THE SIGNAL PCB. Good Luck, big IRISH. PS: or call for service, Cost average repair about $500.00, you do the math maybe it's time for a new TV. G.L.

Aug 16, 2008 | Mitsubishi VS-50605 50" Rear Projection...

1 Answer

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

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

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

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Check the connections on your front control panel PCB to see if they are all secure then trace them back to where the plug into the chassis and check the connection there as well

Mar 01, 2008 | Mitsubishi VS-50605 50" Rear Projection...

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.

Feb 24, 2008 | Mitsubishi VS-50605 50" Rear Projection...

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Look for 2 resistors off of pin 2 of IC951 R955 & 956 they are hooked in parralell and the tail end of those resistors are grounded.

Feb 23, 2008 | Mitsubishi VS-50605 50" Rear Projection...

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CHECK BASE BIAS VOLTAGE OF Q217, FOR 0 VDC (BIASED OFF) IF .7 VDC (BIASED ON) CHECK C268 (22 UFD 50 V) OFF C OF Q215 V-PROTECTOR ON THE SIGNAL PCB. 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. 3. CHECK PIN 6 OF IC200 FOR 9 VDC IF LOW OR MISSING CHECK IC203 PART # 270P210010 ON THE SIGNAL PCB. 4. MAY BE INTERMITTENT. CHECK SOLDER CONNECTIONS AT CONNECTOR "DY" ON THE YOKES. Now these are the technical terms, if you do not have the experience you may need a qualified person to do this. Hope this helps

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