Mitsubishi Diamond Plus 120U User Manual page 20

PROBLEM
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Thin vertical black lines on one or both sides of the screen.
This minor condition is caused by grille element overlap
which can occur during shipping. We suggest slapping the
cabinet sides with an open hand after the monitor is warm.
If this fails, position an open white window over the affected
Black vertical
area of the screen and maximize the brightness and
lines are visible
contrast controls. This will cause localized heating of the
on the screen.
overlap which will clear permanently in a few minutes. Be
sure to readjust the brightness and contrast controls back
to the normal viewing levels after this procedure.
•
The 2 very faint thin lines across the screen are normal.
Two fine horizontal
They are caused by the aperture grille stabilization
lines are visible on
filaments (Damper Wires) which are required for all
the screen.
aperture grille CRTs'.
Shadow of Damper Wires
A buzzing sound
A brief vibration or hum sound that is heard just after power
•
when power on.
up is normal. This is caused by the automatic degaussing
function. This sound will be heard each time the monitor is
powered up from a cold start and each time the manual
degauss button is used.
ITEMS TO CHECK
Aperture Grille
Electron Gun
Damper Wires
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LOCATION
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Shadow of
Damper Wires
Aperture Grille Type
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