Acer Aspire 5920g Service Guide

							
Chapter 367
9.Remove the two screws fastening the right LCD bracket and detach it.
10. Disconnect the LCD cable from the LCD.
11 . Detach the CMOS cable from the LCD cover and remove the CMOS module.
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 take out the hard disk drive from the HDD case.
Disassembling the ODD Module
1.Remove the two screws holding the optical bracket.
2. Then remove the optical bracket from the optical disk drive. 
						

							
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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 determine which page to go to.
Symptoms (Verified)Go To
Power failure (The power indicator does not go 
on or stay on). “Power System Check” on page 69
POST does not complete. No beep or error 
codes are indicated. “Power-On Self-Test (POST) Error Message” on 
page 72
“Undetermined Problems” on page 84
POST detects an error and displayed messages 
on screen. “Error Message List” on page 73
Other symptoms (i.e. LCD display problems or 
others). “Power-On Self-Test (POST) Error Message” on 
page 72
Symptoms cannot be re-created (intermittent 
problems). Use the customer-reported symptoms and go to 
“Power-On Self-Test (POST) Error Message” on 
page 72
“Intermittent Problems” on page 83
“Undetermined Problems” on page 84
Troubleshooting
Chapter 4 
						

							
68Chapter 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 program runs to FDD Test.
3. Follow the instructions in the message window.
If an error occurs with the internal diskette drive,  reconnect the diskette connector on the system board.
If the error still remains:
1. Reconnect the external diskette drive/DVD-ROM module.
2. Replace the external diskette drive/CD-ROM module.
3. Replace the main board.
External CD-ROM Drive Check
Do the following to isolate the problem to a controller,  drive, or CD-ROM. Make sure that the CD-ROM does 
not have any label attached to it. The label can caus e damage to the drive or can 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 CD-ROM Test is passed when  the program runs to CD-ROM Test.
3. Follow the instructions in the message window.
If an error occurs, reconnect the connector on  the System board. If the error still remains:
1. Reconnect the external diskette drive/CD-ROM module.
2. Replace the external diskette drive/CD-ROM module.
3. Replace the main board.
Keyboard or Auxiliary Input Device Check
Remove the external keyboard if the internal keyboard is to be tested.
If the internal keyboard does not work or an unexpected  character appears, make sure that the flexible cable 
extending from the keyboard is correctly se ated in the connector on the system board.
If the keyboard cable connection is  correct, run the Keyboard Test. 
If the tests detect a keyboard problem, do the following  one at a time to correct the problem. Do not replace a 
non-defective FRU:
1. Reconnect the keyboard cables.
2. Replace the keyboard.
3. Replace the main board.
The following auxiliary input devices are supported by this computer:
TNumeric keypad
TExternal keyboard 
						

							
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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 installed into  the connector. A loose connection can cause an error.
Power System Check
To verify the symptom of the problem, power on the co mputer using each of the following power sources:
1. Remove the battery pack.
2. Connect the power adapter and check that power is supplied.
3. Disconnect the power adapter and install the charged ba ttery pack; then check that power is supplied by 
the battery pack.
If you suspect a power problem, see the approp riate power supply check in the following list:
T“Check the Power Adapter” on page 70
T“Check the Battery Pack” on page 71 
						

							
70Chapter 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 84.
TIf the voltage is not correct, go to the next step.
NOTE:  An audible noise from the power adapter does not always indicate a defect.
3. If the power-on indicator does not light up, check  the power cord of the power adapter for correct 
continuity and installation.
4. If the operational charge does not work, see “Check the Battery Pack” on page 71. 
Pin 1: +19 to +20.5V
Pin 2: 0V, Ground 
						

							
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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 measure  the voltage between battery terminals 1(+) and 6(ground). See the 
following figure
3. If the voltage is still less than 7.5 Vdc  after recharging, replace the battery. 
To check the battery charge operation, use a discharged battery pack or a battery pack that has less than 50% 
of the total power remaining when installed in the computer. 
If the battery status indicato r does not light up, remove the battery pack and let it return to room temperature. 
Re-install the battery pack.
If the charge indicator still does not li ght up, replace the battery pack. If the charge indicator still does not light 
up, replace the DC/DC charger board. 
Touchpad Check
If the touchpad doesn’t work, do the following actions  one at a time to correct the problem. Do not replace a 
non-defective FRU:
1. Reconnect the touchpad cables.
2. Replace the touchpad.
3. Replace the system board.
After you use the touchpad, the pointer drifts on the scr een for a short time. This self-acting pointer movement 
can occur when a slight, steady pressure is applied to the touchpad pointer. This symptom is not a hardware 
problem. No service actions are necessary if the  pointer movement stops in a short period of time. 
						

							
72Chapter 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 symptom is not listed, se e “Undetermined Problems” on page 84.
The following lists the error messages that the BIOS di splays on the screen and the error symptoms classified 
by function. 
NOTE:  Most of the error messages occur  during POST. Some of them display information about a hardware 
device, e.g., the amount of memory installed. Others  may indicate a problem with a device, such as the 
way it has been configured. 
NOTE:  If the system fails after you make changes in the B IOS Setup Utility menus, reset the computer, enter 
Setup and install Setup defaults or correct the error.  
						

							
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Index of Error Messages
Error Code List
Error CodesError Messages
006 Equipment Configuration Error Causes:
1. CPU BIOS Update Code Mismatch
2. IDE Primary Channel Master Drive Error
(THe causes will be shown before “Equipment Configuration 
Error”)
010 Memory Error at xxxx:xxxx:xxxxh (R:xxxxh, W:xxxxh) 
070 Real Time Clock Error
071 CMOS Battery Bad
072 CMOS Checksum Error
110 System disabled. Incorrect password is specified.
 Battery critical LOW In this situation BIOS will issue 4 short beeps then shut down 
system, no message will show.
 Thermal critical High In this situation BIOS will shut down system, not show message.
Error Message List
Error MessagesFRU/Action in Sequence
Failure Fixed Disk Reconnect hard disk drive connector. “Load Default Settings” in BIOS Setup Utility.
Hard disk drive
System board
Stuck Key see “Keyboard or Auxiliary Input Device Check” on page 68. 
Keyboard error see “Keyboard or Auxiliary Input Device Check” on page 68. 
Keyboard Controller Failed see “Keyboard or Au xiliary Input Device Check” on page 68. 
Keyboard locked - Unlock key switch Unlock external keyboard
Monitor type does not match CMOS - Run Setup Run “Load Default Settings” in BIOS Setup Utility.
Shadow RAM Failed at offset: nnnn BIOS ROM System board
System RAM Failed at offset: nnnn DIMM System board
Extended RAM Failed at offset: nnnn DIMM System board
System battery is dead - Replace and run Setup Replace  RTC battery and Run BIOS Setup Utility to reconfigure 
system time, then reboot system.
System CMOS checksum bad - Default 
configuration used RTC battery
Run BIOS Setup Utility to reconfigure system time, then reboot 
system.
System timer error RTC battery Run BIOS Setup Utility to reconfigure system time, then reboot 
system.
System board 
						

							
74Chapter 4
Real time clock error RTC battery
Run BIOS Setup Utility to reconfigure system time, then reboot 
system.
System board
Previous boot incomplete - Default configuration 
used Run “Load Default Settings” in BIOS Setup Utility.
RTC battery
System board
Memory size found by POST differed from 
CMOS Run “Load Default Settings” in BIOS Setup Utility.
DIMM
System board
Diskette drive A error Check the drive is de fined with the proper diskette type in BIOS 
Setup Utility
See “External Diskette Drive Check” on page 68. 
Incorrect Drive A type - run SETUP Check the drive is  defined with the proper diskette type in BIOS 
Setup Utility
System cache error - Cache disabled System board
CPU ID: System board
DMA Test Failed DIMM System board
Software NMI Failed DIMM System board
Fail-Safe Timer NMI Failed DIMM System board
Device Address Conflict Run “Load Default Settings” in BIOS Setup Utility. RTC battery
System board
Allocation Error for device Run “Load Default Settings” in BIOS Setup Utility. RTC battery
System board
Failing Bits: nnnn DIMM BIOS ROM
System board
Fixed Disk n None
Invalid System Configuration Data BIOS ROM System board
I/O device IRQ conflict Run “Load Default Settings” in BIOS Setup Utility. RTC battery
System board
Operating system not found Enter Setup and see if fi xed disk and drive A: are properly identified.
Diskette drive
Hard disk drive
System board
Error Message List
Error MessagesFRU/Action in Sequence