No Display Issue - Acer Aspire One D255 Series Service Manual

No Display Issue

If the Display doesn't work, perform the following actions one at a time to correct the problem. Do not replace
a non-defective FRUs:
Replace LCD
panel/cable
No POST or Video
If the POST or video doesn't display, perform the following actions one at a time to correct the problem.
1. Make sure that the internal display is selected. On this notebook model, switching between the internal
display and the external display is done by pressing Fn+F5. Reference Product pages for specific model
procedures.
2. Make sure the computer has power by checking at least one of the following occurs:
• Fans start up
• Status LEDs light up
If there is no power, see "Power On Issue" on page 126.
3. Drain any stored power by removing the power cable and battery and holding down the power button for
10 seconds. Reconnect the power and reboot the computer.
4. Connect an external monitor to the computer and switch between the internal display and the external
display is by pressing Fn+F5 (on this model).
If the POST or video appears on the external display, see "LCD Failure" on page 129.
5. Disconnect power and all external devices including port replicators or docking stations. Remove any
memory cards and CD/DVD discs. Restart the computer.
If the computer boots correctly, add the devices one by one until the failure point is discovered.
6. Reseat the memory modules.
7. Remove the drives (see "Disassembly Process" on page 46).
8. If the Issue is still not resolved, see "Online Support Information" on page 259.
Chapter 4
No LCD panel/cable ok?
Replace
M/B
START
go to no power
Power On? No trouble shooting
Ext. DDRRAM
Connect
module well No
it well
connected?
Replace
Ext. DDRRAM
No Ext. DDR RAM
module OK?
module
LCD cable well
No Connect it well
connected?
step
127