Subject:
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Re: Things I should never do....
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Tue, 31 Dec 2002 02:20:15 GMT
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Viewed:
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1188 times
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> I also blew apart a Commodore 1084SP2 14" NTSC preview monitor by feeding it
> bad sync off my edit card. Any ideas? I presume flyback circuitry is gone.
Funny you should mention that one - I have one in the cupboard above
my head. I originally used it with my Amiga, then as a TV off a VCR.
The power button eventually failed and turned out to be some sort of
non-standard part that couldn't be replaced easily given the physical
dimensions of the place it had to be in, so I just wedged a
screwdriver in there to keep it permanently on and just unplugged it
when needed. Why am I mentioning all this???
Oh yes... In order to find out the part numbers, I bought the service
manual for it. Unfortunately a) it's been 15 years since I took any
courses that involved television/montitor servicing and b) I don't
have all the appropriate equipment to service a live monitor without
risk of bodily injury (most of my "servicing" has involved testing
components with the power of - burned out power resistors,
transistors, diodes, etc.)
My point here, and yes, there is one, is that I can't suggest anything
specific, especially without more specific symptoms. I'd guess a dead
power transistor or diode. Generally the control components are
isolated from the high-voltage components such that any abnormally
high voltages generated by improper signal frequencies won't work
their way back to the control side of things. It's the interfacing
power transistors/opto-isolators/etc. that take the beating. Again,
though, I'm talking through my hat - it's been a long time and my
experience has been minimal. I can bring you the service manual if
you'd like. Realistically, I'll never use the 1084 again (and hence,
never bother to repair it). Even as a TV, it pales in comparision to a
good SVGA monitor and a TV capable Radeon card.
Matthias Jetleb
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