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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 the issues, the projector had superior picture and user
interface/remote to any thing else in the same price range at the time of it's original release.
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| What follows is a disassembly guide that I created to replace the fans in my projector. I have placed it here
on my site hoping it may be useful to other people. While I only needed to replace my fans, this alone requires
almost complete disassembly of the projector thus you can see every step required to remove every part from the
projector. I am hoping this guide will help you to repair different areas of your projector. It is still a work in
progress so I am sure there are typos, spelling errors and missing information. I am working on getting this page
finished, if you have any suggestions, corrections or questions you can email me: david at functionalchaos dot net.
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***WARNING - I AM NOT A EXPERT ON THE DISASSEMBLY OF 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 BELOW AND
RUIN YOUR PROJECTOR.*** |
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| Preparing and Removing the Lamp |
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Create a work area large enough to layout all the parts your going to be removing.
A kitchen table would work great. You will need a #2 Philip's™, a few jewelers size flat heads and a pair of needle nose
pliers may come in handy. Begin by first taking out the lamp. Your going to want to keep the screws you remove in each
step with the part you remove in that same step. If you do not, you may have trouble figuring out what type of
screw went where.
A. Remove the lamp cover screws from the side of the projector without venting wholes.
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| B. Remove the lamp retaining screws.
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| C. Gently slide the lamp out.
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| Let the Disassembly Begin! |
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STEP 1 - Begin by turning the projector over so that it is sitting on its top with the bootem facing you.
A. Remove the screw holding on the silver plastic lens cover.
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| B. Gently lift up on the cover and remove the wire plug atched to the small pcboard. Also remove the
soft black gasket seal around the lens.
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STEP 2 - Remove the front fan cover.
A. Remove the three small rubber covers over the fan cover scews with a small jewlers flat head screw driver.
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| B. Remove three screws from under rubber covers.
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| C. Gently lift and pull out (down) on front fan cover to remove. |
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STEP 3 - Slide the filter out.
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STEP 4 - Remove the plastic top cover.
A. Remove the 7 screws from the bottem of the projector.
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| B. Turn projector over and gently pull forward and up on top cover to remove.
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| C. Trun left side of cover in a clockwise direction, keeping the right side close to the base and then remove
the main wire plug to control pannel pcboard.
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| Here is a picture of the projector with the cover off. I have identified the main areas of component location.
Please note the terms used are my own and not those BenQ or anyone else may use.
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STEP 5 - Remove the rear/side cover surround.
A. Remove the 2 screws from the back of the projector below the video inputs.
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| B. Remove the 2 screws from the rear/bottem of the projector below the power input/switch.
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| C. Remove the 2 screws from the front left and right sides of the projector inside the base.
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| D. Pull gently down and out on the sides of the surround while poping up the tabs on the top/rear
of the projector to remove the surround.
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| E. Remove to wire plugs and screw holding metal shield and ground screws so surround can be removed from unit.
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STEP 6 - Remove the Main PCBOARD.
A. Remove the remaining 4 screws from the pcboard metal shield and then lift shield off gently.
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| B. Remove remainig wire plug and color wheel ribon cable from front end of pcboard, use the following 3
images as a guide.
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| C. Gently lift the PCBOARD from the mounting area, there are two connectors that must pop loose on the bottem of the board,
one to the video input board and one to the lens board.
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STEP 7 - Remove the Lamp and Color Wheel Housing.
A. Remove the screw holding the PSU fan cover on in the middle of the housing..
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The Lamp PSU fan exposed.
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| We can see on this projector that the color wheel is broken. The following four pictures show the broken
color wheel as well as pieces of the color wheel I found floating around in the case.
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| B. There are sevral screws that need to be removed to get the housing off. You start by removing the Lamp
PSU housing, then the Lamp and Color wheel housing come off. The digram below shows the locations of screws
and plugs that must be removed in the next steps.
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| C. Start by removing the screw holding the Lamp Power plug into the top of the Lamp Housing.
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| Remove the Lamp Power plug.
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| D. Remove the screws and plug securing the Lamp PSU.
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| Remove Lamp PSU carefully.
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| E. Remove the screws holding the Lamp and Color Wheel Housing.
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| Gently seperate the two housing halfs being carful of the lamp temp sensor/lamp door open switch cable
that is still connected to the bottem of the case (cable marked below).
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| Lay the left housing on it's side so you can detach the formentioned cable plug and switch.
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| Remove the screws and plug holding the switch in place.
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| Remove the switch.
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Step 8 - We can finaly remove the Fans!
Just lift up on them, no screws.
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