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Chapter 4 135
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:
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 134.
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 137.
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 44).
8. If the Issue is still not resolved, see “Online Support Information” on page 187.
START
Power On? No
goto no power
trouble shooting
step
Replace
Ext. DDR RAM
module
No
No Connect it well
CPU OK?
Replace
M/B
Connect
it well
No
Replace CPU
No
LCD module
OK?
No
Replace
LCD panel/
LCD cable
Ext. DDRRAM
module well
connected?
Ext. DDRRAM
module OK?
CPU well
connected?
VGA BD
OK?
Or Connect it well?
No
Connect it well
or Replace VGA
BD