Optoma HD66: Lamp Fail status after dmd replacement? - AVS Forum
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Old 04-05-2013, 02:37 PM - Thread Starter
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Hey everybody, I followed a thread on here to get a new DMD chip after I had about 30% failed pixels. This is my first time ever taking a projector apart to fix a DMD chip issue, and this is also my first home theater projector. Basically, here's what happened:

- Removed projector from ceiling mount
- Let cool for an hour
- Removed the lamp and set it aside where it was never touched. (about 900 hours on the lamp)
- disassembled the projector more, unscrewed the logic board to lift it off the DMD chip, then pulled the Lens/DMD/color wheel assembly.
- Removed and replaced the DMD chip with this one: 1280 6138B 6038B DMD chip 6039B Optoma PRO360W HD600X Solve White Pixel FROM USA
-Applied a new thermal pad. I forget the brand of the pad but I use it to couple the graphics cards in my computer to their copper blocks, and they produce 188w of heat, so I think it would be sufficient here. I tried thermal paste but there is a gap between the heat sink and the back of the DMD chip so the paste wouldn't work
-Reassembled everything, replaced the bulb, I turned it on, and the Power light flashes orange, and the lamp light is solid red. Consulting the manual, it seems like lamp failure.

I also repeated the process with he original DMD chip, same results.

So did I screw up my lamp? or do you think there's something I could've missed in the disassembly/reassembly. Is there anything I could visually look for to see if the lamp has failed? The filament seems to be in 1 piece.

EDIT: Also, if it helps, I'm reading infinite ohms across the bulbs prongs
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Old 04-05-2013, 03:12 PM
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Regarding trying to read the lamp. there are no filaments INSIDE the lamp so a meter test is useless. The only VISUAL indications that the lamp has failed would be if it popped, otherwise, there is NO way to tell if a lamp is good or not other than trying it in the projector.

You had to have missed something when you reassembled it.
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Old 04-05-2013, 09:11 PM
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I agree. You missed a connector or something when you put it back together. The lamp is an arc lamp. Unless you drop it, you can't break it. NO filament.

Welcome to the darkside.....
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Old 04-05-2013, 09:19 PM - Thread Starter
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Thanks for the quick info! I'll be pulling it back apart shortly, in hopes to find something I missed. I know the lamp circuit is on the opposite side of the lens assembly, so I don't think I touched it, but here's hoping I missed something
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Old 04-06-2013, 10:55 AM
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Quote:
Originally Posted by eovnu87435ds View Post

Thanks for the quick info! I'll be pulling it back apart shortly, in hopes to find something I missed. I know the lamp circuit is on the opposite side of the lens assembly, so I don't think I touched it, but here's hoping I missed something

The lamp circuit STILL has to be plugged back into the main board.... which you removed to replace the DMD.. wink.gif

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