Download Sharp 21H-S3P Specifications

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2 Troubleshooting Procedures
Procedure 4
2.8 Display Troubleshooting
Replacement Check
Fluorescent lamp, FL inverter, LCD module, HV cable and LCD/FL cable are connected
to display circuits. Any of these components may be faulty. Refer to Chapter 4,
Replacement Procedures, for instructions on how to disassemble the computer and then
perform the following checks:
If fluorescent lamp does not light, perform Check 1.
If characters or graphics on the internal display are not displayed clearly,
perform Check 4.
If some screen functions do not operate properly, perform Check 4.
If fluorescent lamp remains lit when the display is closed, perform Check 5.
Check 1
Replace fluorescent lamp with a new one following the instructions in Chapter
4, Replacement Procedures and test the display again. If the problem still
occurs, perform Check 2.
Check 2
LCD/FL cable may be faulty. Replace FL/LCD cable with a new one following
the instructions in Chapter 4, Replacement Procedure and test the display again.
If the problem still occurs, perform Check 3.
Check 3
FL inverter may be faulty. Replace FL inverter with a new one following the
instructions in Chapter 4, Replacement Procedure and test the display again. If
the problem still occurs, perform Check 4.
Check 4
LCD module may be faulty. Rep lace LCD module with a new one following
the instructions in Chapter 4, Replacement Procedure and test the display again.
If the problem still occurs, perform Check 5.
Check 5
System board may be faulty. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedure.
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[CONFIDENTIAL]
Satellite A50S/TECRA A3X Maintenance Manual (96 0-534)