My 10 year old Mitsubishi 45" rear projection has developed constant horizontal line interference. Picture is stable, just have horizontal lines marching up it. Also has developed occasional video loss although audio continues.
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Give it time to warm up like another 10 to 15 mins i find put a tv guide channel on the screen stays pretty much the same picture, then leave the TV on" i use a 4 hour rule if i dont view in 4 hours or more i will close tv power
Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback
lines, frame ok. I detected two badly soldered double diode rectifiers
in the secondary part of the power supply ! I checked all other joints,
and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok