Acer Aspire 9120 Service Guide

Chapter 375
21.Remove the two screws holding the VGA heatsink.
22.Then detach the VGA heatsink from the main board. 

76Chapter 3
Disassembling the LCD Module
1.Remove the four screw caps as shown.
2.Remove the four screws holding the LCD bezel.
3.Then detach the LCD bezel from the LCD module.
4.Remove the four screws fastening the LCD and the LCD inverter to the panel.
5.Place the LCD as shown.
6.Disconnect the LCD back light cable.
7.Disconnect the LCD cable on the other side, then remove the inverter.
8.Take out the LCD assembly from the LCD panel.
9.Tear off the tape fastening the LCD cable then disconnect the LCD...

Chapter 377
13.Take out the spring carefully.
14.Remove the LCD latch from the LCD panel.
15.Release the foil fasteing the CCD module cable.
16.Remove the screw holding the CCD module to the LCD panel then detach the CCD module.
17.Separate the CCD panel from the CCD assembly.
18.Then remove the two screws fastening the digital camera to CCD hinge and CCD panel.
19.Take out the CCD hinge.
20.Take out the digital camera board from the CCD panel.
21.Disconnect the cable from the digital camera board. 

78Chapter 3
Disassembling the External Modules
Disassembling the HDD Module
1.Remove two screws hodling the HDD bracket on one side.
2.Remove another two screws fastening the HDD bracket on the other side.
3.Detach the HDD from the HDD bracket.
Disassembling the ODD Module
1.Remove the three screws holding the optical bracket.
2.Remove the optical bracket from the optical disk drive. 

Chapter 479
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...

80Chapter 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 one 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 the...

Chapter 481
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 doagmpstotics 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 installed into...

82Chapter 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, see “Undetermined Problems” on page 96.
TIf the voltage is not correct, go to the next step.
NOTE: An audible noise from the power adapter does not...

Chapter 483
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 shown 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 problem is on recharging or discharging. 
From Hardware:
1.Power off the computer. 
2.Remove the battery pack and measure the...

84Chapter 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 sequence shown in FRU/Action column, if the FRU 
replacement does not solve the problem, 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...