Compal NBLB2, Service Manual

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To determine if the computer‟s external USB devices are functioning properly,
perform the following procedures. Figure 6-5 outlines the process. Start with
Procedure 1 and continue as instructed.

Procedure 1: External device and connection check

Procedure 2: Replace system board
6.1 Procedure 1 External device and connection check
The USB device may be damaged or the connection may be faulty. Perform Check 1.
Check 1
Make sure USB device cable is firmly plugged into one of the USB sockets.

If the cable is connected correctly, go to Check 2.
Check 2
Plug the USB device into another USB socket (there are three in all).

If the USB device still does not work, go to Check 4.

If the device functions correctly when connected to another USB port, go to
Check 3
Check 3
Make sure that the USB socket is firmly secured to the system board of the computer.

If the malfunction remains, the system board may be damaged. Go to Procedure
2.
Check 4
Connect an alternative USB device to one of the computer‟s USB ports, and then
boot the computer. The computer automatically detects the external device.

If the alternative USB device works correctly, the original device may be
damaged and should be replaced.

If the alternative USB device appears to have the same problem as the original
device, the system board may be damaged. Go to Procedure 2.
6.2 Procedure 2 Replace system board
If the error persists, the system board may be damaged.