Troubleshooting - Toshiba Satellite U840 Maintenance Manual

2 Troubleshooting Procedures
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2.1

Troubleshooting

Chapter 2 describes how to determine which Field Replaceable Unit (FRU) in the computer
is causing the computer to malfunction.
The FRUs covered are:
1. Power supply
2. System Board
3. USB FDD
4. SSD/2.5" HDD
5. Keyboard
The Test Program operations are described in Chapter 3. Detailed replacement procedures are
described in Chapter 4.
NOTE: After replacing the system board, it is necessary to execute the subtest 01 initial
configuration of the 3.3 Setting of the hardware configuration in Chapter 3. Also
update with the latest BIOS as described in Appendix G "BIOS Rewrite
Procedures"
After replacing the LCD, update with the latest EC/KBC and brightness data as
described in Appendix H "EC/KBC Rewrite Procedures" to set the SVP
parameter.
The implement for the Diagnostics procedures is referred to Chapter 3. Also, following
implements are necessary:
1. Phillips screwdrivers (For replacement procedures)
2. Implements for debugging port check
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Toshiba Free-DOS system
Satellite U840 Maintenance Manual (960-Q08)
6. Touch pad
7. Display
8. LAN
9. Wireless LAN
/Bluetooth
10. Sound
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