DVI module in JVC projector (DxxWPxx) series has light sensor!
 

To Jerry, I remembered your doubts about this eye in the DVI module
also for others in this service field,

As stated in the nesda ohio's warning about these DVI module commit
sucide (by blanking out DVI's eeprom if allowed powered with back
panel removing or removed with power still connected. JVC stated very
clearly this module is not covered under warranty and costs 200 to
replace that small box.

Red circled is the light sensor.
http://www3.sympatico.ca/jpero/mixed...eupdvi_eye.jpg

My solution: *Unplug* power cord JVC projector *first* and proceed
get back panel off and locate that small tin box (DVI module), unplug
all wires to it (usually three). Operate as usual for
throubleshooting. The jumper method works as outlined in nesda's.

Remember to unplug that power for projector first before reconnecting
those plugs to that DVI module or moving jumper to default position.
Don't plug back in till back panel is firmly screwed in.

I already warned about this to both boss and my coworker.

Cheers,

Wizard