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  Troubleshooting Procedures  
   
Procedure 4 
Connector Check and Replacement Check 
 The Fingerprint sensor is connected to the system board as below. 
Check 1  If any of the connections are loose, reconnect firmly and repeat Procedure 1 to 3  . 
If there is still an error, go to Check 2. 
 
Check 2  The Fingerprint sensor may be damaged. Replace it with a new one following the 
instructions in Chapter 4, Replacement Procedures and check the operation. If the 
problem still exists, perform Check 3. 
Check 3  The web camera/digitizer/fingerprint sensor /sw board cable may be damaged. 
Replace it with a new one following the instructions in Chapter 4, Replacement 
Procedures
. If the problem still exists, perform Check 4. 
Check 4  The system board may be damaged. Replace it with a new one following the 
instructions in Chapter 4, Replacement Procedures
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[CONFIDENTIAL]  
PORTEGE M780 Maintenance Manual (960-809)