Re: Very old monitor repair
From: Clint Sharp (clint_at_clintsmc.demon.co.uk)
Date: 03/02/05
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Date: Wed, 2 Mar 2005 23:11:02 +0000
In message <4225bc42$0$163$3a628fcd@reader2.nntp.hccnet.nl>, CIP
<onzin-del-@hccnet.nl> writes
>Hi everybody,
>
>I got an very old monochrome monitor that is dead.
>
>It's an NEC BU-1201M(E)-1 from about 1985
>
>It had an burnout fuse on the main board, replaced it but the screen remains
>black. Audio works. When I switch it on the first second the end of the CTR
>lights up but then it gets very dim or even no light at all. I can hear the
>HV make a little hunnimg noise.
The HV shouldn't hum, it should whistle, you can check for operation of
the flyback transformer by holding a neon screwdriver close to the
transformer, it should glow on a monochrome unit if it's running.
>
>It's a monitor from a computer that controls a factory. The monitor was
>turned on in 1985 and never turned off, but when not in use the screen was
>cleared. The video input is NTSC
>
>Checked the power transistors (h/v) and they are ok. Transformer is ok.
>
>Anybody any tips?
Replace it, if it's in a factory it's needed! You could probably replace
it with a 12" PAL Unit and get away with it with a couple of minor
tweaks to the frame rate and line sync. http://rswww.com supply chassis
monitors as do many other 'industrial' electronics component suppliers.
-- Clint Sharp
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