Chapter 2 Troubleshooting Procedures
2.18 CRT Troubleshooting
To check if the computer’s CRT is malfunctioning or not, follow the troubleshooting procedures below as instructed.
Procedure 1: External Monitor Check
Procedure 2: Connector and Cable Check
Procedure 3: Replacement Check
Procedure 1 External Monitor Check
Connect an external monitor to the computer’s external CRT port, and then to see if you can transfer video image to external monitor. If not, go procedure2.
Procedure 2 Connector and Cable Check
CRT board is connected to system board by a CRT cable. Their cables may be disconnected from system board. Disassemble the computer following the steps described in Chapter 4, Replacement Procedures.
If the connection is loose, reconnect firmly and restart the computer. If the problem still occurs, go to Procedure 3.
Procedure 3 Replacement Check
Check 1 CRT cable may be faulty. Replace CRT cable with a new one following the instructions in Chapter
Check 2 CRT board may be faulty. Replace CRT board with a new one following the instructions in Chapter 4, Replacement Procedure, and then test again. If the problem still occurs, perform Check 3.
Check 3 System board may be faulty. Replace it with a new one following the instructions in Chapter 4, Replacement Procedure.
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