Acer Aspire 5940g Service Guide

							Chapter 3131
Replacing the DIMM Modules
Replacing the Hard Disk Drive Module
1.Insert the DIMM Module in place. 2.Press down to lock the DIMM module in place.
1. Place the HDD in the HDD carrier. 2.Replace the four screws (two each side) to secure 
the carrier.
3. Insert the HDD SATA interface connector as 
shown. 4.
Place the HDD into the chassis as shown to 
engage the interface. 
						

							132Chapter 3
Replacing the ODD Module
1.With the ODD tray in the eject position, replace the 
ODD bezel on the new ODD Module. 2.
Secure ODD bracket with two screws.
3. Slide the module in to the chassis and press until 
the module is flush with the chassis. 4.
Replace the single screw to secure the Module. 
						

							Chapter 3133
Replacing the Lower Covers
Replacing the SD Dummy Card
Push the SD Dummy into the slot until an audible click indicates that the card is correctly inserted.
1.
Replace the Memory Cover back edge first as 
shown. 2.
Replace the memory/HDD cover back edge first as 
shown.
IMPORTANT:  Ensure that the all the securing tabs are correctly located in the casing.
3. Secure the four captive screws.
HDD 
Cover
WLAN 
Cover 
						

							134Chapter 3
Replacing the PCI Express Dummy Card
Push the Express Dummy into the slot until an audible click indicates that the card is correctly inserted.
Replacing the Battery
1.Slide and hold the battery release latch to the 
release position (1), insert the battery pack and 
press down (2).2.Slide the battery lock in the direction shown to 
secure the battery in place.
1 2 
						

							Chapter 4135
Troubleshooting
Common Problems
Use the following procedure as a guide for computer problems.
NOTE: The diagnostic tests are intended to test only Acer  products. Non-Acer products, prototype cards, or 
modified options can give false e rrors and invalid system responses.
1. Obtain the failing symptoms in as much detail as possible.
2. Verify the symptoms by attempting to re-create the fa ilure by running the diagnostic test or by repeating 
the same operation.
3. Use the following table with the verified symptom to determine which page to go to.
4. If the Issue is still not resolved, see “Online Support Information” on page 219.
Symptoms (Verified)Go To
Power On Issue Page 136
No Display Issue Page 137
LCD Failure Page 139
Internal Keyboard Failure Page 139
TouchPad Failure Page 140
Internal Speaker Failure Page 140
Internal Microphone Failure Page 142
ODD Failure Page 144
Modem Failure Page 147
WLAN Failure Page 147
Thermal Unit Failure Page 148
Other Functions Failure Page 149
Intermittent Failures Page 150
Undermined Failures Page 150
Chapter 4 
						

							136Chapter 4
Power On Issue
If the system doesn’t power on, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Computer Shutsdown Intermittently
If the system powers off at intervals, perform the fo llowing actions one at a time to correct the problem.
1. Check the power cable is properly connected  to the computer and the electrical outlet. 
2. Remove any extension cables between the computer and the outlet.
3. Remove any surge protectors between  the computer and the electrical outlet. Plug the computer directly 
into a known good electrical outlet. 
4. Disconnect the power and open the casing to check the Thermal Unit (see “Thermal Unit Failure” on page 
148) and fan airways are free of obstructions.
5. Remove all external and non-essential hardware con nected to the computer that are not necessary to 
boot the computer to the failure point.
6. Remove any recently  installed software.
7. If the Issue is still not resolved, see “Online Support Information” on page 219. 
						

							Chapter 4137
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 foll owing 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 “P ower On Issue” on page 136.
3. Drain any stored power by removing the power cabl e 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 s witch 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 139.
5. Disconnect power and all external devices including  port replicators or docking stations. Remove any 
memory cards and CD/DVD di scs. 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 “Disas sembly Process” on page 46).
8. If the Issue is still not resolved, see “Online Support Information” on page 219. 
						

							138Chapter 4
Abnormal Video Display
If video displays abnormally, perform the following actions one at a time to correct the problem.
1.Reboot the computer.
2. If permanent vertical/horizontal lines  or dark spots display in the same location, the LCD is faulty and 
should be replaced. See “Disassembly Process” on page 46.
3. If extensive pixel damage is present (different colore d spots in the same locations on the screen), the LCD 
is faulty and should be replaced.  See “Disassembly Process” on page 46.
4. Adjust the brightness to its highest level. See the Us er Manual for instructions on adjusting settings. 
NOTE:  Ensure that the computer is not running on batter y alone as this may reduce display brightness.
If the display is too dim at the hi ghest brightness setting, the LCD is faulty and should be replaced. See 
“Disassembly Process” on page 46.
5. Check the display resolution  is correctly configured:
a. Minimize or close all Windows. 
b. If display size is only abnormal in an application,  check the view settings and control/mouse wheel 
zoom feature in the application. 
c. If desktop display resolution is not norma l, right-click on the desktop and select 
Personalize ´ Display Settings . 
d. Click and drag the Resolution slider to the desired resolution. 
e. Click  Apply  and check the display. Readjust if necessary.
6. Roll back the video driver to the previous version if updated.
7. Remove and reinstall the video driver.
8. Check the Device Manager to determine that:
• The device is properly installed. There ar e no red Xs or yellow exclamation marks. 
• There are no device conflicts. 
• No hardware is listed under Other Devices.
9. If the Issue is still not resolved, see “Online Support Information” on page 219.
10. Run the Windows Memory Diagnostic from the operating system DVD and follow the onscreen prompts.
11 . If the Issue is still not resolved, see “Online Support Information” on page 219.
Random Loss of BIOS Settings
If the computer is experie ncing intermittent loss of BIOS informati on, perform the following actions one at a 
time to correct the problem.
1. If the computer is more than one  year old, replace the CMOS battery.
2. Run a complete virus scan using  up-to-date software to ensure the computer is virus free.
3. If the computer is experiencing  HDD or ODD BIOS information loss,  disconnect and reconnect the power 
and data cables between devices.
If the BIOS settings are still lost, replace the cables.
4. If HDD information is missing from the BIOS, t he drive may be defective and should be replaced. 
5. Replace the Motherboard.
6. If the Issue is still not resolved, see “Online Support Information” on page 219. 
						

							Chapter 4139
LCD Failure
If the LCD fails, perform the following actions one at a time to correct the problem. Do not replace a non-
defective FRUs:
Built-In Keyboard Failure
If the built-in  Keyboard fails, perform the following actions one at a ti me to correct the problem. Do not replace 
a non-defective FRUs: 
						

							140Chapter 4
TouchPad Failure
If the To u c h P a d  doesn’t work, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:
Internal Speaker Failure
If the internal  Speakers fail, perform the following actions one at a time to correct the problem. Do not replace 
a non-defective FRUs: