Question about Mitsubishi VS-5043/44 50" Rear Projection Television

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Rear Projection 40PW03B

This T.V is 6 years old, the problem started when it switched itself off after a while of being on, now it won't switch on at all.

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Re: Rear Projection 40PW03B

Hi Solaron,
I've tried replacing the 5A fuse but that didn't have any effect.
How should I go about fixing the switching transformer?

Posted on Jan 09, 2008

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Re: Rear Projection 40PW03B

I found that the main 5A fuse was blown. After replacing it, the set worked for about 1/2 hour and the problem really was the "switching transformer had a shorted winding.

Posted on Dec 16, 2007

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Ballast Verification Process
1. Short out door switch (SP001)
2. Apply AC power and wait till DM module boots
3. Press power switch and observe spark gap on ballast
4. If spark gap arcs, suspect Lamp. If color wheel starts but ballast won’t strike
lamp, go to next step.
5. Measure BP252 on AC IN CBA for +300Vdc. If missing check door switch, cable
from AC IN CBA to switch and AC IN PCB. If correct go to next step.
6. Monitor pin 2 of BT251 for Ballast ON command from Light Engine. If present
suspect Ballast. If missing suspect Light Engine. Pin 5 of BT251 starts at 3.3V
after power switch is pressed and drops to .18V when the Light Engine sends the
start command. No change on pin 5 indicates Light Engine is suspect, change
on pin 5 with no ballast start, ballast is suspect.

Note: Lamp may arc but not start. Pin 5 of BT251 is "LAMP LIT" and goes to 1.48V
when lamp is lit. If ballast strikes lamp but lamp won’t stay lit, suspect Lamp.

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