parts one at a time until
the problem is solved:
1. Display switch spring.
2. Keyboard cover.
-------------------------------------------------------
Defective power Replace power interface
interface board. board.
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Defective system board. Replace system board.
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* On the color STN models, brightness is adjusted with the control
slide on the right, and contrast is adjusted with the control slide
on the left.
** When using an external monitor and simultaneously displaying an
image on the internal display, the image on the external monitor may
not fill the screen.
*** This problem indicates that the backlight or its power circuitry has
failed. Since you cannot observe the POST results on the display
panel when the backlight is not functioning, connect the unit to an
external monitor before powering the unit up. If an external monitor
is not available, verify that POST completes by opening and closing
the display, listening for the single or double beep, and watching
for the LEDs to turn on at the front of the computer.
**** The spare display panel, inverter board, display cable, and display
enclosure for the 9.5" color TFT models come preinstalled in a
display assembly. To replace these parts on the 9.5-inch color TFT
models, replace the entire display assembly.
***** The brightness adjustment function on TFT panels must be tested with
the display bezel on, since these panels contain a light feedback
circuit. Outside light affects the operation of the circuit and
does not allow the brightness to adjust.
****** Blocks usually appear in an even fraction of the display (1/2, 1/4,
1/6, 1/8, etc.).
===========================================================================
NOTE: To perform a "self-test" on an external VGA color or monochrome
monitor, complete the following steps:
1. Turn off the monitor.
2. Turn off the computer.
3. Disconnect the monitor signal cable from the computer.
4. Turn on the monitor and allow it to warm up for one minute.
The screen should be white. A narrow black border may also appear on the
left and right sides of the display. Either of these displays indicates
that the monitor is working properly.
Table 2-20. External Device Installation Problems
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