Acer Extensa 900 Series Maintenance Manual page 93

Table 5-5 General Troubleshooting Procedures
Problem
No power
Data on the LCD is unreadable
Corrective Actions
1. Check that the AC adapter is plugged into
the power connector of the system. Also,
check that the AC adapter is plugged into a
properly grounded AC power outlet.
2. If using the battery as main power source,
check if the battery pack is of the right type,
charged, and is inserted correctly.
3. Check the powerboard of the system. Is it
inserted into the motherboard connector
properly? Otherwise, replace the powerboard.
1. Adjust the brightness and contrast display
controls.
2. Check if the LCD cables are inserted
properly. Check connections inside the LCD
panel.
3. Verify if installed VGA driver is correct.
4. Check VGA controller chip on the
motherboard to see if there is any cold or
loose soldering.
5. Replace the motherboard.
Troubleshooting Procedures 5-11