Acer Aspire 9420 Service Guide

71Chapter 3
11. Release the screw holding the CCD module and carefully pull the CCD module cable and LCD cable through 
the latch bar and LCD cover.
12. Remove the CCD module cap.
13. Remove the CCD module ring.
14. Push the CCD module upper case a little bit.
15. Then Separate the lower case from the upper case.
16. Release the two screws holding the CCD module board the detach the CCD module board. 

Chapter 472
Please use the following procedures 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 may occur errors or invalid responses.
1. Obtain the detailed fail symptoms as many as possible.
2. Verify the symptoms by attempting to recreate, running the diagnostic tests or repeating the same operation.
3. Disassemble and assemble the unit without any power sources.
4. If any problem occurs, you...

73Chapter 4
System Check Procedures
External Diskette Drive Check
Do the following procedures to isolate the possible effects from a controller, driver, or diskette. A writable, 
diagnostic diskette is required.
Note: Make sure that the diskette does not have more than one label attached. Multiple labels may cause 
damage to the drive or make the drive fail.
1. Boot from the diagnostic diskette and start the diagnostic programs.
2. See if FDD test is passed as the programs run the FDD test.
3. Follow the...

Chapter 474
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 correctly inserted into the connector. A wrong connection will cause errors.
Power System Check
To verify the symptoms, power on the computer by using the following power sources separately.
1. Remove the battery pack.
2. Connect the power adaptor and check the power supply.
3. Disconnect the power adaptor and install the battery...

75Chapter 4
If the charge indicator does not light up, replace the battery pack. If the charge indicator still does not light up, 
replace the AC/DC charger board.
Touchpad Check
If the touchpad does not work, follow the procedures one at a time to correct the problem. Do not replace a non-
defective FRU.
1. After rebooting, run Tracking Pad PS2 Mode Driver. For example, run Syn touch driver.
2. Run utility with the PS/2 mouse function and check if the mouse is working.
3. If the PS/2 mouse does not...

Chapter 476
Power-On Self-Test (POST) Error Message
The POST error message index lists the error message and their possible causes.
Note: Perform the FRU replacement or actions in the sequence shown in Error Message List, if the FRU 
replacement does not solve the problem, put the original part back in the computer. Do not replace a non-
defective FRU.
The error messages are listed in the coming pages to indicate the BIOS signals on the screen and the error 
symptoms classified by functions. If the...

77Chapter 4
Index of Error Messages
Error Message List
Error MessagesFRU/Action in Sequence
Struck Key See “Keyboard or Auxiliary Input Device Check“.
System CMOS checksum bad - 
Default configuration usedRTC battery
Run BIOS Setup Utility to reconfigure system, then 
reboot system.
Real time clock error RTC battery
Run BIOS Setup Utility to reconfigure system time, then 
reboot system.
Main board
Previous boot incomplete - Default 
configuration used“Load Default Settings” in BIOS Setup Utility.
RTC...

Chapter 478
Phoenix BIOS Beep Codes
CodeBeepsPOST Routine Description
02h Verify Real Mode
03h Disable Non-Maskable Interrupt (NMI)
04h Get CPU type
06h Initialize system hardware
07h Disable shadow and execute code from 
the ROM.
08h Initialize chipset with initial POST 
values
09h Set IN POST flag
0Ah Initialize CPU registers
0Bh Enable CPU cache
0Ch Initialize caches to initial POST values
0Eh Initialize I/O component
0Fh Initialize the local bus IDE
10h Initialize Power Management
11h Load alternate...

79Chapter 4
3Ah Autosize cache
3Ch Advanced configuration of chipset 
registers
3Dh Load alternate registers with CMOS 
values
41h Initialize extended memory for 
RomPilot.
42h Initialize interrupt vectors
45h POST device initialization
46h 2-1-2-3 Check ROM copyright notice
47h Initialize I20 support
48h Check video configuration against 
CMOS
49h Initialize PCI bus and devices
4Ah Initialize all video adapters in system
4Bh QuietBoot start (optional)
4Ch Shadow video BIOS ROM
4Eh Display BIOS copyright...

Chapter 480
7Ch Set up hardware interrupt vectors
7Eh Initialize coprocessor if present
80h Disable onboard Super I/O ports and 
IRQs
81h Late POST device initialization
82h Detect and install external RS232 ports
83h Configure non-MCD IDE controllers
84h Detect and install external parallel ports
85h Initialize PC-compatible PnP ISA 
devices
86h Re-initialize onboard I/O ports
87h Configure Motherboard Configurable 
Devices (optional)
88h Initialize BIOS Data Area
89h Enable Non-Maskable Interrupts...