Acer Aspire 5720 Service Guide

Chapter 365
9.Pull the RF cable through the opening in the lower case as shown.
10. Remove the screw holding the RF board to the lower case.
11 . Take out the RF board from the lower case, then de tach the RF cable from the RF board as shown.
12. Remove the RJ-11 jack from the lower case.
NOTE:  RF board on selected models only.
13. Remove the screw fastening the main board to the lower case.
14. Detach the main board from the lower case as shown.
15. Turn the main board over, then remove th e DC-in...

66Chapter 3
Disassembling the Upper Case Assembly
1.Turn the upper case over.
2. Remove the two screws fastening the button board.
3. Detach the button board with FFC from the upper case as shown.
4. Remove the two screws fastening the LED board.
5. Detach the LED board with FFC from the upper case as shown.
6. Remove the two screws fastening the left speaker.
7. Remove the left speaker from the upper case as shown. 

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

68Chapter 3 

Chapter 369
Disassembling the External Modules
Disassembling the HDD Module
1.Remove the four screws holding the HDD ( hard disk drive) case; two on each side.
2. Carefully slide out the hard disk drive from the HDD case.
Disassembling the ODD Module
1.Remove the three screws holding the optical bracket.
2. Then remove the optical bracket from the optical disk drive. 

70Chapter 3 

Chapter 471
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...

72Chapter 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 the...

Chapter 473
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 doa gmpstotics 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...

74Chapter 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 88.
TIf the voltage is not correct, go to the next step.
NOTE:  An audible noise from the power adapter does...