BenQ PE7700 projector starts ok and then fans stoping and red light starts flahing and everythin on screeen disapears manual said taht problem is fans not working i see then fans working when i start projector then after 10 sec they stop working and everything stops working can anybody help thank you

The green temp light indicates that the fan isn't working; some models have 2 fans. The fan cools the projector lamp and protects the unit from damage. When the fan isn't working, the projector turns off to keep the temperature from continuing to rise. This information is available on page 52 of the User Manual available here: https://www.benq.com/en-us/support/downloads-faq/products/projector/w1080st/manual.html . The current link to the manual is https://esupportdownload.benq.com/esupport/Projector/UserManual/Projector_um_User%20Manual_20130529_114725W1070_W1080ST_EN.pdf . The recommended solution is a service call.

If your projector is out of warranty and not covered by a repair plan, I found several sources for the replacement fan with a Google search. IFixit has some videos for taking apart the projector to clean it and replace the fan on some BenQ projectors.

I hope this helps.

Cindy Wells

If the lamp LED flashes red, it indicates that the front cover is not installed properly, the fan is not working, the translation board is defective or the ventilation holes are blocked.

The first thing I would try is to remove the lamp assembly and try reinstalling. (Did you purchase a genuine BenQ lamp assembly)?

If ok, you can download a service manual here (but be advised, this is not for the unqualified. You should seek repair through your dealer).

Elektrotanya for electronics experts

when you say its cutting off the image, do you mean it is blanking the top and bottom off the picture. Is the image that is displayed on the computer the same as on the projector or is it just a cinemascope version of the computer screen

it's the colorwheel. you could try to get the part from projector doctor or send it in for repair.

try www.projectordoctor.com

if the cables are new, reset the settings to factory default to make sure the resolution matches. if there ia still an issue, replace the main board.

the lamp is running too warm from inability to cool down. clean out the dust with canned air and check the fans. the temp sensor may need to be replaced, as the heat may have desroyed it.

you have a problem with either the fans, the ballast, or the colorwheel. if the fans turn on, listen for a high-pitched whir. if you don't hear it, replace the colorwheel. if you do, replace the ballast. if the fans don't spin, replace them.

this model is prone to over heat. look near the lamp for the temp sensor it is most likely bad

I have found that vertical lines that suddenly appear from projectors are due to poorly connected cables. Sut off your projector and wait for the fan to go off. Then unplug the connectors from the computer to the projector and secure them again, making sure to go all the way. Hope this helps.