Acer Travelmate 7720 Service Guide

Chapter 3101
Removing the Left and Right Hinge
1.See “Removing the Battery Pack” on page 62.
2.See “Removing the Lower Cover” on page 64.
3.See “Removing the WLAN Board Modules” on page 68.
4.See “Removing the Middle Cover and the Power Board” on page 78.
5.See “Removing the LCD Module” on page 81.
6.See “Removing the LCD Bezel” on page 97.
7.See “Removing the LCD module with the Brackets” on page 98.
8.Remove the two screws (E) securing the left and right hinge to the back cover. 
9.Remove the left and...

102Chapter 3
9.Loosen the aluminum tape holding the antennas in place.
10.Release the antenna cables from the latches. 
11 .Remove the tapes together with the antenna cables from the back cover. 
Removing the Internal Microphone and Web Camera
1.See “Removing the Battery Pack” on page 62.
2.See “Removing the Lower Cover” on page 64.
3.See “Removing the WLAN Board Modules” on page 68.
4.See “Removing the Middle Cover and the Power Board” on page 78.
5.See “Removing the LCD Module” on page 81.
6.See...

Chapter 3103
7.See “Removing the LCD module with the Brackets” on page 98.
8.See “Removing the Left and Right Hinge” on page 101.
9.See “Removing the Antennas” on page 101.
10.Remove the tape holding the internal microphone in place. 
11 .Remove the internal microphone from the back cover. 
12.Remove the Web camera from the back cover. 
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104Chapter 3
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Chapter 4105
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...

106Chapter 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 4107
External keyboard
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 diagnostic 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...

108Chapter 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:
Replace the System board.
If the problem is not corrected, see “Undetermined Problems” on page 124.
If the voltage is not correct, go to the next step.
NOTE: An audible noise from the power adapter does not...

Chapter 4109
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...

11 0Chapter 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...