Troubleshooting A White Display; Troubleshooting A Black Display; Troubleshooting A Display With Color Problems - HP 8753E Service Manual

Troubleshooting a White Display

If the display is white, the A27 back light inverter is functioning properly.
Connect a VGA monitor to the analyzer.
If the image on the external monitor is normal, then suspect A2, AM, or the
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front panel cabling.

Troubleshooting a Black Display

1. Remove the front panel with the exception of leaving cable W17 (A2 to
motherboard) connected.
2. Press 1Preset) while checking to see if there is a flash of light.
If the light does not flash, suspect the front panel cabling, the display lamp,
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or the A27 inverter.

Troubleshooting a Display with Color Problems

2. Run display service test 74 as described in Chapter 10. Confirm that there
are four intensities for each color.
If the test passes, then continue.
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If the test fails, then suspect the front panel cabling, A2, A19, or Al&
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3. Connect a VGA monitor to the analyzer.
If the image on the external monitor has the same color problems, then
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replace the A19 GSl?
missing color bit. Suspect the front panel cabling, A2, A19, or AM.
Digital Control Troubleshooting