Acer Aspire 4920 Service Guide

Chapter 391
17.Detach the acetic tapes holding the FPC cable to the edge of the LCD panel. 
18.Detach the acetic tape securing the FPC connector.
19.Disconnect the FPC cable from the LCD panel. 
Removing the LCD Brackets
1.See “Removing the Battery Pack” on page 53.
2.See “Removing the Lower Cover” on page 55.
3.See “Removing the DIMM” on page 56.
4.See “Removing the WLAN Board Module” on page 57.
5.See “Removing the Hard Disk Drive Module” on page 58.
6.See “Removing the Optical Drive Module” on page...

92Chapter 3
15.Remove the four screws (H) securing the left and right LCD brackets to remove the brackets. 
Removing the LCD Module Hinges
1.See “Removing the Battery Pack” on page 53.
2.See “Removing the Lower Cover” on page 55.
3.See “Removing the DIMM” on page 56.
4.See “Removing the WLAN Board Module” on page 57.
5.See “Removing the Hard Disk Drive Module” on page 58.
6.See “Removing the Optical Drive Module” on page 59.
7.See “Removing the CPU Heatsink Module” on page 62.
8.See “Removing the CPU” on...

Chapter 393
17.Remove the left and right hinges from the LCD back cover. 
Removing the Antennas 
1.See “Removing the Battery Pack” on page 53.
2.See “Removing the Lower Cover” on page 55.
3.See “Removing the DIMM” on page 56.
4.See “Removing the WLAN Board Module” on page 57.
5.See “Removing the Hard Disk Drive Module” on page 58.
6.See “Removing the Optical Drive Module” on page 59.
7.See “Removing the CPU Heatsink Module” on page 62.
8.See “Removing the CPU” on page 63.
9.See “Removing the Keyboard” on...

94Chapter 3
16.Detach the gasket tape holding the left antenna in place, remove the antenna bracket, then carefully 
remove the antenna.
Removing the Microphones 
1.See “Removing the Battery Pack” on page 53.
2.See “Removing the Lower Cover” on page 55.
3.See “Removing the DIMM” on page 56.
4.See “Removing the WLAN Board Module” on page 57.
5.See “Removing the Hard Disk Drive Module” on page 58.
6.See “Removing the Optical Drive Module” on page 59.
7.See “Removing the CPU Heatsink Module” on page 62....

Chapter 395
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Chapter 497
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 recreate the failure by running the diagnostic tests or repeating the 
same operation.
3.Do not use any power sources when performing an assembly or...

98Chapter 4
System Check Procedures
External CD/DVD-ROM Drive Check
Perform the following procedures to isolate the possible problem a controller, drive, or CD-ROM. 
NOTE: Make sure that the CD-ROM does not have any label attached to it. The label may damage the drive or 
cause drive failure.
1.Boot from the diagnostic disc and start the diagnostic programs.
2.See if CD-ROM Test is passed when the program runs the CD-ROM Test.
3.Follow onscreen instructions.
If an error occurs, reconnect the drive to the...

Chapter 499
Power System Check
Do the following:
1.Remove the battery pack.
2.Connect the power adapter and check the power supply.
3.Disconnect the power adapter and install the battery pack; then check that power supply.
If you suspect a power problem, see the appropriate power supply check in the following list:
T“Check the Power Adapter” on page 99
T“Check the Battery Pack” on page 99
Check the Power Adapter
Unplug the power adapter cable from the system and measure the output voltage at the plug of...

100Chapter 4
Touchpad Check
If the touchpad doesn’t work, do the following  procedures in sequence to correct the problem. Do not replace 
a non-defective FRU:
1.After rebooting, run Tracking Pad PS2 Mode Driver. For example Syn touch driver.
2.Run utility with the PS/2 mouse function and check if the mouse is working.
3.If the PS/2 mouse does not work, then click if the main board to switch board FPC is connected properly.
4.If the main board to switch board FPC is connected correctly, then check if the...