If the touchpad doesn't work, do the following actions one at a time to correct the problem. Do not replace a non-defective FRU:
- After rebooting, run Tracking Pad PS2 Mode Driver. For example, run Syn touch driver.
- Run utility with the PS/2 mouse function and check if the mouse is working.
- If the the PS/2 mouse does not work, then check if the main board to switch board FPC is connected O.K.
- If the main board to switch board FPC is connected well, then check if the FCC on touch pad PCB connects properly.
- If the FFC on touch pad PCB connects properly, then check if LS851 JP1 Pin6=5V are pulese. If yes, then replace switch board. If no, then go to next step.
- Replace touch pad PCB.
- If the touch pad still does not work, then replace FPC on Track Pad PCB.
After you use the touchpad, the pointer drifts on the screen for a short time. This self-acting pointer movement can occur when a slight, steady pressure is applied to the touchpad pointer. This symptom is not a hardware problem. No service actions are necessary if the pointer movement stops in a short period of time.
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