Just recently (last 2 weeks), there has been a horizontal humm bar in the video on the back wall projector.
We tested the signal at all locations and were unable to pinpoint the source of the humm. (Cabling looked clean scaler was replaced, routing all bypassed.) Today I replaced the VGA d/a that was feeding that signal to the scaler and BAM!! the promblem was solved. (The D/A was failing)
Back wall projection at OP campus is now clean and looking good…
