Acer Aspire 4520 Service Guide

Chapter 365
Removing the Touchpad Cable
6.Disconnect the touchpad cable from the touchpad module as shown.
Disassembling the Main Board
Removing the USB Board
1.Remove the two screws fastening the USB board.
2. Remove the USB board.
Removing the MDC Card Module
3.Remove the screw fastenin g the MDC card module.
4. Remove the MDC card module. 

66Chapter 3
Removing the Thermal Module and System Fan
5.Unscrew the four spring screws and remove  the two screws fastening the thermal module.
6. Disconnect the system fan cable as shown.
7. Remove the thermal m odule and system fan.
Removing the CPU
8.Use a flat screwdriver to release th e CPU lock (Turn counter clockwise).
9. Remove the CPU from the CPU socket carefully. 

Chapter 367
Disassembling the LCD Module
1.Remove the six screw rubbers as shown.
2. Then remove the six screws fastening the LCD bezel.
3. Detach the LCD bezel from the LCD module carefully.
4. Remove the four screws holding the LCD.
5. Detach the two inverter cable con nectors from the inverter board.
6. Disconnect the CCD cable connector from the CCD board.
7. Take out the LCD from the LCD panel.
8. Remove the two screws fastening the left LCD bracket and detach it. 

68Chapter 3
9.Remove the two screws fastening the right LCD bracket and detach it.
10. Disconnect the LCD cable from the LCD.
11 . Detach the microphone cable from the LCD cover and remove the microphone.
12. Remove the CCD from the LCD cover as shown.
Disassembling the External Modules
Disassembling the HDD Module
1.Remove the two screws fastening the bracket to the HDD module.
2. Remove the bracket.
Disassembling the ODD Module
1.Remove the two screws holding the optical bracket.
2. Then remove the...

Chapter 469
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...

70Chapter 4
System Check Procedures
External Diskette Drive Check
Do the following to isolate the problem to a controller, driver, or diskette. A write-enabled, diagnostic diskette is 
required.
NOTE:  Make sure that the diskette does not have more than on e label attached to it. Multiple labels can cause 
damage to the drive or cause the drive to fail. 
Do the following to select the test device:
1. Boot from the diagnostics diskette and start the diagnostics program.
2. See if FDD Test is passed as...

Chapter 471
If any of these devices do not work, reconnect the cable connector and repeat the failing operation. 
Memory check
Memory errors might stop system operations, show  error messages on the screen, or hang the system.
1. Boot from the diagnostics diskette and start the di agnostic program (please refer to main board).
2. Go to the diagnostic memory in the test items.
3. Press F2 in the test items.
4. Follow the instructions in the message window.
NOTE:  Make sure that the DIMM is fully...

72Chapter 4
Check the Power Adapter
Unplug the power adapter cable from the computer and measure the output voltage at the plug of the power 
adapter cable. See the following figure:
1. If the voltage is not correct , replace the power adapter.
2. If the voltage is within the range, do the following:
TReplace the System board.
TIf the problem is not corrected, s ee “Undetermined Problems” on page 86.
TIf the voltage is not correct, go to the next step.
NOTE:  An audible noise from the power adapter does...

Chapter 473
Check the Battery Pack 
To check the battery pack, do the following:
From Software:
1.Check out the Power Management in Control Panel
2. In Power Meter, confirm that if the parameters sh own in the screen for Current Power Source and Total 
Battery Power Remaining are correct.
3. Repeat the steps 1 and 2, for both battery and adapter.
4. This helps you identify first the prob lem is on recharging or discharging. 
From Hardware:
1. Power off the computer. 
2. Remove the battery pack and...

74Chapter 4
Power-On Self-Test (POST) Error Message 
The POST error message index lists the error message and their possible causes. The most likely cause is 
listed first.
NOTE: Perform the FRU replacement or actions in the s equence shown in FRU/Action column, if the FRU 
replacement does not solve the proble m, put the original part back in the computer. Do not replace a 
non-defective FRU.
This index can also help you determine the next possible FRU to be replaced when servicing a computer.
If the...