Problem: Epson 8700UB refuses to power on while inverted - AVS Forum
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post #1 of 4 Old 01-22-2014, 11:49 PM - Thread Starter
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I did a fair bit of research and troubleshooting and listening to give as many details as possible.
This projector has served me well for over 2 years, always in table mode/right side up.

I was tired of perching the PJ on a tall shelf, because the shelf took up too much living room space, so I bought a ceiling mount assembly from monoprice: linky.

I had the assembly attached to underside of PJ, and PJ inverted so I could test how the image looked while lining up ceiling positioning. This is the turning point.

While upright, here's the boot order: press power button, lamp has dim glow indicating it is powering on. Fan kicks on. Lamp briefly turns off, then gives a mechanical whirr, then kicks the lamp into regular bright mode and displays whatever input is selected.

While inverted, boot order: press power button, lamp has dim glow indicating it is powering on. Fan kicks on. Lamp briefly turns off, then visibly goes bright, then immediately goes off. Lamp goes to dim for a few seconds, switches to bright, them immediately goes off. Repeat same a third time, then kicks fan into high speed, and blinks red light on lamp indicator on and off (troubleshooting instructions matching this symptom in manual claim that the lamp needs replaced. This lamp has under 100 hours of use, so I'm leaning away from that conclusion.)

More important findings: I started PJ upright, then very slowly and steadily rotated 180 degrees. After passing to the 110 to 120 degrees of rotation, I hear a quiet, but very distinct sound of something sliding, then a gentle clink of metal on metal. Right when that sound and internal impact occurs, PJ IMMEDIATELY does the same error described in the above paragraph. I am guessing that something internal is loose, and is triggering a faulty-lamp-installation failsafe.

This projector does not feature an auto-inversion detector.
Lamp is securely installed, and does not shift when I tug on the handle.

I have also tried this slow 180 degree rotation while PJ is set for "right side up image" and "upside down image" (while projecting an inverted image, the PJ fan accelerates, but it does not trigger the lamp error described above). I get identical results during rotation.
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post #2 of 4 Old 01-23-2014, 12:07 AM - Thread Starter
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Okay, more tweaking gives us more results.

Just to get some consistency, I decided to continue testing. Removed the lamp from the housing, and turned it over. The clinking noise comes from the lamp itself, so that noise mystery is solved. I was about to give up and replace the lamp, but science teaches us to repeat until we get consistent results, so I continued testing. Re-inserted the lamp and screwed the mounting screws back into place, about a quarter-turn more firmly than before.

Tried powering the PJ on while holding it inverted, and it worked fine. As soon as I did any rotation, it threw the previously mentioned error. PJ is probably designed such that if it detects any internal shifting while powered on, it powers off just to be on the safe side.

I turn it on a second time while it sits upside down on top of RPTV. Boots just fine, displays just fine. Absolutely no errors or malfunction of any kind. Will finish installing to ceiling and report back with results.

Theorizing or similar stories are welcome.

Related thread is available here.
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post #3 of 4 Old 01-23-2014, 02:28 PM
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Quote:
Originally Posted by Drjebus View Post

PJ is probably designed such that if it detects any internal shifting while powered on, it powers off just to be on the safe side.

Related thread is available here.

No, it isn't. Something is loose in your lamp housing, it shouldn't be. I can rotate my 8700ub any way I want while it's on.
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post #4 of 4 Old 01-23-2014, 09:21 PM - Thread Starter
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If I crack open the PJ to correct this, do I run the risk of bricking it entirely? How high is that risk?
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