Repairing the BenQ™ PE7700 DLP™ Projector
While this projector had much trouble with premature lamp failure initially,
BenQ did eventually get the issue resolved with a firmware update which apparently
changed the fan speed. Despite it's issues, the projector had superior picture and user
interface to anything else in the same price range at the time of it's original release.
I have created two repair guides based on repairs I have made to my own PE7700 projector.
The first guide walks you through disassembling the projector to remove and replace
the fans. The second guide is designed to help you re-assemble a completely disassembled
pe7700, including which screws go where for each part or sub-assembly. I am hoping these
guides will help you to repair different areas of your projector. These pages are still
a work in progress so I am sure there are typos, spelling errors and missing information.
I am working on getting these pages finished, if you have any suggestions, corrections or
questions you can email me: david at functionalchaos dot net.
***WARNING - I AM NOT CERTIFIED TO REPAIR THE PE7700 OR ANY PROJECTOR. IT IS POSSIBLE
TO DESTROY A WORKING PROJECTOR BY TAKING IT APART. IF YOUR PROJECTOR IS STILL UNDER WARRANTY YOU MAY
LIKELY VOID YOUR WARRANTY BY TAKING IT APART. I AM NOT RESPONSIBLE IF YOU USE THE INFORMATION LINKED
BELOW AND RUIN YOUR PROJECTOR.***
Fan Failure - Replace Front Fans:
Symptoms:
- The projector powers its self off and displays flashing red TEMP and flashing red LAMP lights
- You may hear some abnormal noise when the fans startup on projector power on or during the
normal use of the projector.
- When you look in the front vent cover with the projector on, you can see that one or both fans
are not spinning.
Notes:
- Don't mistake the noise of a broken color wheel for fan noise. Broken color wheels
usually sound different than worn fan bearing noise. A broken color wheel should have made
a loud pop or "shattering glass" type sound when it broke and would usually not display
both flashing red lights.
- The front fans (2 fans) are Sunon KDE1208PTV1.13.MS.A.F.GN units. Make sure the replacement
fans match this exact and entire part number. There are very similar part numbers available
that will NOT work. In particular you must have the "F", there are parts available from Sunon with
the exact matching part number minus the "F".
- A good known source for these fans is FutureElectronics.com
- You will have to solder your fan harness onto the replacement fans -or- splice the wires of
the fans and the harness
- There is also a "squirrel cage" style fan that helps cool the power supply. I have heard of rare
cases where this fan was bad and needed to be replaced.
Guide:
Broken (shattered) Color Wheel - Replace Color Wheel:
Symptoms:
- Your using your projector and you hear a loud pop or "glass shattering" type sound. The
projector may stay powered on, but it continues to make a funny sound.
- When you power off the projector and remove the lamp you can see that the color wheel is broken.
Have a look at the Color Wheel page for more details.
Notes:
- If you need a replacement color wheel for your PE7700, the only place I have found them
is on eBay™. I have seen them both new and used for $60-$80. I replaced mine with one
described as "Slightly Used" and have had good luck with it thus far. If you find a source for
new color wheels please email me with the details so I can post it here.
Guide: