As a technician in a community college, I had the opportunity to setup computers to display an image to the instructor on the Dell monitor and an images to various projector for the students to see and can assist in troubleshooting classroom projectors located on a portable cart or mounted in the ceiling.
Before you get started it is a good idea to have some tools and spare parts especially if you will be doing this on a regular basis. Also, when troubleshooting issues with the projector, I find working backwards helps in narrowing down issues and lets me know if I have to make a call to a vendor for additional parts and service.
I always start by checking out the LEDs on the projector to see if it will identify what issues that the projector might be experiencing such as a blown or old lamp, overheating from clogged filters or fans. I’ll switch out the lamps if the LEDs alerted me and clean the filters with compressed air or replace if they are extremely bad.
If the menu for the projector shows when powered up but no image from the computer even when changing sources, my next step is a direct connection to the projector with a laptop and a known working video cable (that I tested by hooking it up to a monitor previously) and try to get the desktop to appear. If the desktop shows, then I connect the original video cable to the laptop so I can see if it went bad so the needed part can be requested from stock.
With a projector on a cart, I can easily replace the cable that is between the computer and projector but those that are ceiling mounted has a cable running in the walls and ceiling and a second from the computer to a receptacle on the wall and that needs an electrician.
Spare Parts and Tools
* A Laptop with a known working Video Cable
* A known working Lamp/Bulb and clean filters
* A magnetized Flathead and Phillips Screwdriver
* A sturdy step ladder (for ceiling mounted)
* A copy of the custom projector settings
* A can of compressed air or air compressor.