USING THE SYMPTOM CHART
Find the symptom that best describes how the defective monitor
appears and then try the recommended actions in the order listed.
If the first corrective action does not solve the problem,
put back the original module or part before trying the next action.
Symptom Corrective Action
No power 1. Check fuse; replace if blown.
(LED doesn't light) If it blows again, replace transformer.
2. Replace transformer.
3. Replace power switch.
No raster 1. Check that video cable is securely connected.
2. Adjust the external brightness control on the
back of the case.
3. Adjust the contrast control.
4. Check that all connectors are secure
on the CRT board and the main logic board.
5. Replace main logic board.
6. Replace CRT.
One vertical 1. Replace main logic board.
raster line appears 2. Replace CRT assembly.
Raster deformed Replace CRT assembly.
Wavy picture Replace main logic board.
Spot remains Replace main logic board.
with unit off
Brightness range 1. Replace main logic board.
abnormal 2. Replace power transformer.
Raster size small, Replace main logic board.
picture abnormally
bright
No vertical Replace main logic board.
synchronization
Screen bright, Replace main logic board.
no picture
15 or more seconds Change CRT assembly.
for picture to appear
Picture appears 1. Replace main logic board.
and disappears 2. Replace CRT assembly.
Out of focus See "Focus" in Section 3, Adjustments*
Won't focus 1. Replace main logic board.
2. Replace CRT.
Narrow raster Replace main logic board.
Picture compressed Replace main logic board.
or stretched out
Picture tears See "Horizontal Synchronization" in
Section 3, Adjustments*
Image reversed Yoke connector (P4) is plugged in backwards.
(after servicing)
Image inverted Yoke connector (P3) is plugged in backwards.
(after servicing)