162 Chapter 7
Troubleshooting the Processor, Power Supply, and Display
Isolating a Display Problem
Verifying HSYNC, VSYNC, and LCD Clock
To verify that the HSYNC (horizontal sync), VSYNC (vertical sync), and
LCD clock are functioning correctly, measure the following signals as
indicated in Figure 7-3. If all of these signals measure correctly, suspect
a defective backlight or LCD. The backlight is the most probable cause.
NOTE
The P2 connector on the front panel interface board has supports
soldered at each end, as shown in the figure. Make sure to measure the
correct pins. Be very careful when measuring these signals to ensure
you do not short out any pins.
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