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Troubleshooting Procedures
Procedure 2 Antenna Connection Check
The 3G wiring diagram is shown below:
Any of the connections may be disconnected. Disassemble the computer following the steps
described in Chapter 4, Replacement Procedures, and perform the following checks:
Check 1 Make sure the 3G antenna cables are firmly connected to the 3G card and FWGAN
board.
If the 3G antenna cables are disconnected, connect them firmly and go to
Procedure 1. If the 3G card is still not functioning properly, go to Check 2.
Check2 Make sure the 3G card is firmly connected to CN2610 on the system board. If the
connector is disconnected, connect it firmly and go to Procedure 1. If the 3G card
is still not functioning properly, perform Procedure 3.
Procedure 3 Replacement Check
The 3G antenna, 3G card and the system board are connected to the circuits. Any of these
components may be damaged. Refer to Chapter 4, Replacement Procedures, for instructions
how to disassemble the computer and then perform the following checks:
Check 1 The 3G card may be defective or damaged. Replace it with a new one following
the steps in Chapter 4, Replacement Procedures. If the problem still exists, perform
Check 2.
Check 2 The 3G antennas may be defective or damaged. Replace the antennas with new
ones following the steps in Chapter 4, Replacement Procedures. If the problem still
exists, perform Check 3.
Check 3 The system board may be defective or damaged. Replace the board with a new one
following the instructions in Chapter 4, Replacement Procedures.
2-70 [CONFIDENTIAL] PORTEGE M780 Maintenance Manual (960-809)