Chapter 6 6-7
Digital Control Troubleshooting
Display Troubleshooting (A2, A18, A19, A27)
Display Troubleshooting (A2, A18, A19, A27)
This section contains the following information:
• Evaluating your Display
• Troubleshooting a White Display
• Troubleshooting a Black Display
• Troubleshooting a Display with Color Problems
Evaluating Your Display
Switch the analyzer off, and then on. The display should be bright with the annotation
legible and intelligible. There are four criteria against which your display is measured:
• Background Lamp Intensity
• Green, Red or Blue Stuck Pixels
• Dark Stuck Pixels
• Newtons Rings
Evaluate the display as follows:
• If either the A18 LCD, A19 GSP, A9 CPU or A27 backlight inverter assemblies are
replaced, perform a visual inspection of the display.
• If it appears that there is a problem with the display, refer to the troubleshooting
information that follows.
• If the new display appears dim or doesn't light, see “Backlight Intensity Check,” next.
Backlight Intensity Check
Required Equipment and Tools
Analyzer warm-up time: 30 minutes. Photometer warm-up time: 30 minutes.
Description HP/Agilent Part or Model Number
Photometer Tektronix J16
Probe Tektronix J6503
Light Occluder Tektronix 016-0305-00
Antistatic Wrist Strap Cord 9300-0980
Antistatic Wrist Strap 9300-1367
Static-control Table Mat and Ground Wire 9300-0797
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