Instruction manual

94 Chapter 4
Troubleshooting
No Display troubleshooting
• Whether BIOS options are correct or not as described in “To Confirm or Set the BIOS
Options” on page 121.
Step 4. Checking with the external monitor
Connect an external VGA monitor to the VIDEO output on the E5061A/E5062A rear
panel.
• If something is displayed on the external monitor, the problem is present around the
LCD. Also check the A21 and A22 because the ON/OFF setting of the LCD backlight
is controlled by the A21 through the A22.
• If nothing is displayed even on the external monitor, the problem seems in the A20
digital motherboard.
Step 5. Checking flat cable
Check a flat cable between the A20 and A22.
Step 6. Check around the backlight
Check A52 inverter board and a cable between the A52 and A22. Also check the cables
between the A51 LCD and A52. If the cables are normal, check the A51 LCD.