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Video Troubleshooting Table
SYMPTOM
Monitor appears non-
functional
Audio is present
VGM controls operate
normally
WARNING: HIGH VOLTAGE.
voltages. Avoid touching any part of the monitor until power has been off for some time.
A picture tube can maintain a hazardous charge for up to several days. Only qualified
technicians should service monitors. Turn off the power, unplug the VGM and
discharge the CRT before attempting service. Even properly discharged tubes can
revert to a highly charged state, without reapplication of power.
WARNING:
voltage. During bench servicing, you may need to operate the monitor outside the
l
cabinet. If you do, isolate the monitor from line voltage with an isolation transfomer.
CRT
CAUSE
Power problem
Faulty wiring
Improper monitor
adjustments
Faulty monitor
circuitry
VGM
In normal operation, the monitor doesn't require isolation from AC line
*NECK BOARD -,@,,-
Typical Monitor Components
7-l 0
REQUIRED ACTION
Verify connection of AC Power to video monitor.
Inspect CRT neck in dim light. Glowing filament
near CRT base proves that some monitor
circuits receive power. Still, voltages or signals
may not be normal.
1.
Turn off VGM power. Verify that video signal and
Remote Adjustment Board connectors seat
properly on Video Monitor Board.
2. Assure that video cables connect to circuit
boards.
3.
Assure that no wires aie
mounting brackets.
Check
that
CONTRAST are set above their minimum tevels.
Examine AC line fuse on Video Monitor Board. If
fuse is faulty, replace it with identical fuse.
2. If fuse is good: Verify that video monitor
operates correctly by placing it in working VGM
3.
If monrtor
bad: Check monttor power supply.
IS
4 . I f power's;ply
horizontal out ut transistor and related circuit .
and store potentially lethal high
monitors generate
I
*MAIN BOARD
ASSEMBLY
REMOTE ADJUSTMEN
BOARD ASSEMBLY
BRIGHTNESS
(intensity)
i s g o o d : C h e c k mo;or 1
and
1 0
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