Acer Aspire 5739 Service Guide

							Chapter 3131
Replacing the Battery
1.Slide and hold the battery release latch to the 
release position (1), then insert the battery and 
press down (2).2.Slide the battery lock/unlock latch to the lock 
position.
1
2 
						

							132Chapter 3 
						

							Chapter 4133
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 errors 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 failure 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 215.
Symptoms (Verified)Go To
Power On Issue Page 134
No Display Issue Page 136
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 145
Rightside USB Failure Page 149
Modem Failure Page 149
WLAN/WiMAX Failure Page 150
Bluetooth Failure Page 150
EasyTouch Button Failure Page 151
Media Board Failure Page 151
Finger Print Reader Failure Page 152
Thermal Unit Failure Page 152
Other Functions Failure Page 153
Intermittent Failures Page 154
Undetermined Failures Page 154
Chapter 4 
						

							134Chapter 3
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: 
						

							Chapter 3135
Computer Shutsdown Intermittently
If the system powers off at intervals, perform the following 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 and fan airways are free of obstructions.
5.Remove all external and non-essential hardware connected 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 215. 
						

							136Chapter 3
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: 
						

							Chapter 3137
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 139.
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 48).
8.If the Issue is still not resolved, see “Online Support Information” on page 215. 
						

							138Chapter 3
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 48.
3.If extensive pixel damage is present (different colored spots in the same locations on the screen), the LCD is 
faulty and should be replaced. See “Disassembly Process” on page 48.
4.Adjust the brightness to its highest level. See the User Manual for instructions on adjusting settings. 
NOTE: Ensure that the computer is not running on battery alone as this may reduce display brightness.
If the display is too dim at the highest brightness setting, the LCD is faulty and should be replaced. See 
“Disassembly Process” on page 48.
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 normal, 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 are 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 215.
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 215.
Random Loss of BIOS Settings
If the computer is experiencing intermittent loss of BIOS information, 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, the 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 215. 
						

							Chapter 3139
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 time to correct the problem. Do not replace 
a non-defective FRUs: 
						

							140Chapter 3
Touchpad Failure
If the To u c h pa 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: