Toshiba A105-S4004 Maintenance Manual - Page 62
Display, Troubleshooting, The System board may be faulty.
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2.7 Display 2 Troubleshooting Check 3 Check 4 Check 5 The FL may be faulty. Replace it with a new one and return to Procedure 3. If there is still an error, perform Check 4. The FL inverter board may be faulty. Replace it with a new one and return to Procedure 3. If there is still an error, perform Check 5. Make sure the LCD/FL cable has been firmly connected to the system board and LCD module. FL inverter board System board CPU Check 6 Check 7 Check 8 Check 9 Check 10 LCD/FL cable If the cable is loose or off, reconnect it firmly and return to Procedure 3. If there is still an error, perform Check 6. The LCD/FL inverter cable may be faulty. Replace it with a new one and return to Procedure 3. If there is still an error, perform Check 7. The LCD module may be faulty. Replace it with a new one and return to Procedure 3. If there is still an error, perform Check 8. The System board may be faulty. Replace it with a new one. If there is still an error, perform Check 9. The CPU may be faulty. Replace it with a new one following the instructions in Chapter 4. The memory may be defective. Replace the memory module with a new one following the steps described in Chapter 4. If the problem persist, perform Check 10. Satellite A100/A105 / TECRA A7 Maintenance Manual 2-19