Hello, I am an electronics engineering/technology student. At our school,
someone recently donated a non-operational rear projection TV for us to get
some hands-on-skills. It is very old (the manual has an Odyssey Home
Entertainment system and Video Disc player in it!!) so it almost seems silly
to bother repairing it, but getting the component level experience should be
enlightening for us.
Anyway, to get to the point: I am hoping someone might be familiar with this
model enough to provide us with a service manual or even just a schematic
diagram (scanned or otherwise). The model is RD8518AK04, it says it is made
by Magnavox, but the only reference I have found to it online is to a
Sylvania with the same model number.

For those that are curious, we believe we have narrowed it down to the
control board for the guns. A resistor is visibly damaged, but we find it
unlikely that that is the only problem. In fact, we have already repaired
some logic on the MCU panel and the tuner section. The TV at least turns on
now, but the heaters do not power. The voltages that should be present
coming from the control board (zeners, regulators, etc..) are not correct.
Anyways, we are hoping for a schematic so that we can discuss the circuits
in class and try to logically trace the problem as a team (can't get more
than one set of hands in there at a time without potential accidents!)

Thanks a million in advance,
Scott McDonnell