Hi Greg, Mary and Val,
I am sorry to be late with an update. Greg and Mary, I had emailed you of my
victory prematurely. I had the iMac spread accross my bench when you wrote
with your timely help. It was in many pieces. I tested the power reset
witrhout completely reassembling the iMac. It worked fine without a load.
The CUDA switch reset the power settings on the mainboard and let the
powersupply latch its relays and deliver power to the output side of the
board. That's when I thought that I probably had no real problem yet. Just
power data in the CMOS memory that needed to be erased. (the CUDA switch)
So I reassembled the whole mess,( twice). (I nearly finnished and dropped a
screw right into the case, had to strip it back down and pull the connector
board off the back of the tube!) The second time I hit the power switch and
it glowed a second..the fan started, then click it was off again. I am sure
I can reset the CUDA switch again and it will be happy until I put the load
of the rest of the computer back on it.
Val's experience an my own leads me to think I need a new analog board. I
physically inspected the parts that handle most of the high voltage since
these usually fail visibly. Since I didn't find anything a parts machine
would be nice. New parts seem to be pretty high. I don't think a Rev A is
worth much more than $200. An analog board for $130 may make sense but if I
throw two cards at it.....a parts machine would be nice. Maybe Ebay?
I may try to fix the analog board myself. If it's like any other TV the
flyback transformer (or flywheel, sorry Val, that was funny to us old burned
out engineers) is prbably the culprit along with a few tired filter
capacitors. Are there any tech guys listening willing to pass on a list of
"usual suspects" for an analog board failure?? I offer complete indemnity
against consequences of my actions based on this information ;-)
I have a soldering iron and I'm not afraid to use it.
Mark,
P.S. please be sensitive and don't quote my entire saga if you are kind enough
to reply..........................Thanks,
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