Acer Aspire 3935 Service Guide
73
Touchpad Check
If the touchpad doesn’t work, do the following procedures in sequence to correct the problem. Do not replace
a non-defective FRU:
1.
After rebooting, run the Tracking Pad PS2 Mode Driver. For example Syn touch driver.
2.
Run the utility with the PS/2 mouse function and check if the mouse is working.
3.
If the PS/2 mouse does not work, then click if the main board to switch board FPC is connected properly.
4.
If the mainboard to switch board FPC is connected correctly, then check if the FFC on the touchpad board
is connected properly.
5.
If the FFC on the touchpad board is connected correctly, check if LS851 JP1 Pin6 = 5V are pules. If yes,
then replace switch board. If not, then go to the next step.
6.
Replace the touchpad board.
7.
If the touchpad still does not work, then replace the FPC on touchpad board.
After you use the touchpad, the pointer drifts on the screen for a short time. This self-acting pointer movement
will occur when a slight, steady pressure is applied to the touchpad pointer. This symptom is not a hardware
problem. No actions are necessary to be taken if the pointer movement stops in a short period of time.
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a
hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement
should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1.
Run the advanced diagnostic test for the mainboard in loop mode at least 10 times.
2.
If no error is detected, do not replace any FRU.
3.
If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors.
Undetermined Problems
NOTE:
Verify that all attached devices are supported by the computer.
NOTE:
Verify that the power supply being used at the time of the failure is operating correctly. (See “Power
System Check” on page 72)
Follow procedures below to isolate the failing FRU. Do not isolate non-defective FRU.
1.
Power off the computer.
2.
Visually check them for damage. If any problems are found, replace the FRU.
3.
Remove or disconnect all of the following devices:
•
Non-Acer devices
•
Printer, mouse, and other external devices
•
Battery pack
•
Hard disk drive
•
DIMM
•
CD/DVD-ROM drive
4.
Power on the computer.
5.
Determine if the problem has been resolved.
6.
If the problem does not recur, reconnect the removed devices one at a time until you find the failed FRU.
7.
If the problem persists, replace the mainboard, and then LCD assembly (one at a time). Do not replace a
non-defective FRU.
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