1490 FTM Monitor whines

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2 total messages Started by Hendrik O Colijn Wed, 09 Sep 1992 17:27

#203

Author: Hendrik O Colijn
Date: Wed, 09 Sep 1992 17:27

10 lines
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I have a Zenith 1490 FTM monitor that has developed a VERY
annoying whine from (I assume) the flyback transformer.  Can
anyone suggest a fix.  The whine is so bad that the computer is
virtually unusable.

Thanks, Henk
-- 
============================================================================
Henk Colijn             The Ohio State University
colijn.1@osu.edu        Campus Electron Optics Facility

Re: 1490 FTM Monitor whines

#204

Author: Peter Mckinney
Date: Wed, 09 Sep 1992 19:13

28 lines
1978 bytes

In article <1992Sep9.172725.21450@magnus.acs.ohio-state.edu>,
hcolijn@magnus.acs.ohio-state.edu (Hendrik O Colijn) writes:
> I have a Zenith 1490 FTM monitor that has developed a VERY
> annoying whine from (I assume) the flyback transformer.  Can
> anyone suggest a fix.  The whine is so bad that the computer is
> virtually unusable.
> 
> Thanks, Henk
> -- 
> ============================================================================
> Henk Colijn             The Ohio State University
> colijn.1@osu.edu        Campus Electron Optics Facility

        I had an older Zenith CGA monitor that developed a whine
after a while.  The problem turned out to be a bad solder joint
on one of the boards.  After enough use and poor cooling, one
solder joint finally became loose enough so that it would
oscillate at an audible frequency.
        The solution was to try and pinpoint the area it was
coming from and re-solder everything in that area.  Alternatively,
one could "poke" at various likey bad (oscillating) solder joints
(with a non-conductor :-) ) in an attempt to find the culprit.
The inside of a monitor is *not* a safe place however, and caution
*must* be used near the high voltages at back end of the tube.
        This isn't a slick solution, but it worked for me.  Good luck,

                                - Pete McKinney
                                - pm860605@longs.LANCE.ColoState.Edu

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