sher@bbn.com (Lawrence D. Sher) (05/02/91)
When a monitor fails, it could be anything. But when two monitors
partially fail in the identical way, one cannot help suspect that
this is a known failure mode, and fixing it must be known too.
So...
I have two IBM EGA "Enhanced Color Display" monitors, IBM type 5154,
that have identical failure patterns. The symptoms:
When first turned on, the picture is OK except for
unusual background brightness
occasional whole-screen glitches
ocassional raster lines near the top or center that seem misplaced
During the first few minutes of warm-up
the unusual background brightness fades to a normal black
A few minutes later a new mode of behavior suddenly appears:
the background brightness level is up again
the raster appears ragged, possibly every other line misplaced by 1-2
pixels
the beast shrieks (15 kHz?)
it smells like a component has overheated
Momentary disconnect of the signal line restores normal operation for a
few minutes.
Any ideas?
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Larry Sher < US Mail: BBN, MS 6/5A, 10 Moulton St., Cambridge, MA 02138
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