Re: GS RGB singing! Help!

[dynasor@infi.net (Dennis McClain-Furmanski)]

Dave Althoff (dalloff@freenet.columbus.oh.us) wrote:

: In my office at Capitlal University TV, I have two ROM 01 GS's, with the
: Apple RGB monitors.  These things are driving me NUTS!

: As the monitors heat up, they begin to squeal.  Not just the usual monitor
: squeal, these babies SCREAM.  It is beginning to drive me nuts.  What good
: is the computer if I can't leave it on all day!

My sympathies. I have acute hearing in this range and have always suffered
for it. I was literally raised in a TV shop. It's amazing I didn't chew my
own arm off to get out of it.

: I have already resoldered the flybacks in both monitors as a preventative
: measure.  The problem is obviously heat related.  I figured I could trace
: it using a bit of freeze spray, but, alas, I've been running one of the
: monitors with the cover off all day, and can't get it to
: fail...apparently, with the cover off, enough heat doesn't build up.

: Anybody know what to do about this (aside from investing in good
: earplugs)?  I expect it is either a chip component dying, or just not
: enough heat-sink grease on something...

Leave the backs on but loose, so you can pull them off and spray the freeze
mist real quick.

If the flybacks are bolted down with grommets under them, you might try
replacing those. They get dried out and cease to act as cushions. Maybe even
try wedging them with some other cushioning material. There should be enough
pin on the bottom of the flyback that you could wedge maybe 1/8 to 1/4 inch
of cushion under them and still have pin to solder to the board.

--
dynasor@infi.net                                       The Doctor is on.