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Old 8th October 2010, 11:43 AM   #1
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Default QP-4275 Power supply repair

I have a power supply from an Optoma H31 projector that wont light a lamp. Is there any one that knows how to troubleshoot/repair this type of supply. The projector powers on fine, just the lamp won't light.
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Old 8th October 2010, 02:01 PM   #2
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Maybe you'll get lucky and get somebody who is familiar with projector bulb supplies.

First, how do you know the bulb is good?

These projectors have bulb life timers. How do you know there isn't a cutoff in operation?

Failing all else, photograph the offending area in good quality with a digital camera and post the pic.

w
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Old 8th October 2010, 02:16 PM   #3
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Quote:
Originally Posted by wakibaki View Post
Maybe you'll get lucky and get somebody who is familiar with projector bulb supplies.

First, how do you know the bulb is good?

These projectors have bulb life timers. How do you know there isn't a cutoff in operation?

Failing all else, photograph the offending area in good quality with a digital camera and post the pic.

w
I put in a known good bulb from another projector and it didn't light either.
All fans come on but after a few seconds the orange lamp light comes on.
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Old 8th October 2010, 05:54 PM   #4
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When a lamp filament is cold, it has very low resistance and demands a lot of current. If the supply can't deliver the current, the lamp won't light and will overload the power supply. Make sure all connections are clean and solid.

Can you give us some details of the construction of this power supply? There are many ways to make such an animal and unless we know something about what you have, it's pure guesswork.
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