2 Troubleshooting Procedures
2-20 [CONFIDENTIAL] dynabook PORTEGE A30-E/TECRA A30-G,-J/dynabook S Series Maintenance Manual (960-931)
2.5.3 Procedure 3 Connector Check and Replacement Check
USB connectors are mounted on USB board/LTE board or system board and both the boards
are connected with a cable. The connection of the cable and boards may be loosening.
Otherwise, they may be faulty. Disassemble the computer following the steps described in
Chapter 4, Replacement Procedures and perform the following checks.
If the error is detected on Type-A connector, go to Check 1. If the error is detected on Type-C
connector, go to Check 4.
Check 1 Make sure the USB FPC is firmly connected to the boards. If the connection is
loose, connect it firmly and repeat Procedure 1.
If the problem still occurs, go to Check 2
Check 2 USB FPC may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Check 3 USB board/LTE board may be faulty. Replace it with a new one. If the problem
still occurs, perform Check 4.
Check 4 System board may be faulty. Replace it with a new one.
System board
USB board/
LTE board
USB FPC
CN9640
CN9600
CN4800
Type-C connector
CN4810
Type-A connector
USB unit
CN4830
Type-A connector
(USB board only)
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