Acer Aspire 8935g Service Guide

Chapter 4201
TouchPad Failure
If the To u c h P a d doesn’t work, perform the following actions one at a time to correct the problem. Do not 
replace non-defective FRUs:
Start
Check M/B T/P 
FFCRe-assemble th e 
T/P  F F C  to   M/B
OK
NG
Ch eck 
To u c h P a d
OK
Swap/Reassemble 
th e T/P  board  or 
T/P  F F C
OK
NG
Swap M/B 

202Chapter 4
Internal Speaker Failure
If the internal Speakers fail, perform the following actions one at a time to correct the problem. Do not replace 
non-defective FRUs:
Sound Problems
If sound problems are experienced, perform the following actions one at a time to correct the problem.
1.Reboot the computer.
2.Navigate to Start´ Control Panel´ System and Maintenance´ System´ Device Manager. Check 
the Device Manager to determine that:
• The device is properly installed. 
• There are no red Xs or...

Chapter 4203
7.Select Speakers and click Configure to start Speaker Setup. Follow the onscreen prompts to configure 
the speakers.
8.Remove and recently installed hardware or software.
9.Restore system and file settings from a known good date using System Restore. 
If the issue is not fixed, repeat the preceding steps and select an earlier time and date.
10.Reinstall the Operating System.
11 .If the Issue is still not resolved, see “Online Support Information” on page 305.
Internal Microphone Failure
If...

204Chapter 4
b.Select Set up microphone.
c.Select the microphone type from the list and click Next.
d.Follow the onscreen prompts to complete the test.
8.If the Issue is still not resolved, see “Online Support Information” on page 305.
HDD Not Operating Correctly
If the HDD does not operate correctly, perform the following actions one at a time to correct the problem. 
1.Disconnect all external devices.
2.Run a complete virus scan using up-to-date software to ensure the computer is virus free. 
3.Run the...

Chapter 4205
USB (Right Up/Down Side) Failure
If the right-side USB fails, perform the following actions one at a time to correct the problem. Do not replace 
non-defective FRUs:
Other Failures
If the CRT Switch, Dock, LAN Port, external MIC or Speakers, PCI Express Card, 5-in-1 Card Reader or 
Volume Wheel fail, perform the following general steps to correct the problem. Do not replace non-defective 
FRUs:
1.Check Drive whether is OK.
2.Check Test Fixture is ok.
3.Swap M/B to Try.
Intermittent Problems...

206Chapter 4
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, 
whether a short circuit is suspected, or whether the system is inoperative. 
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
NOTE: Verify that all attached devices are supported by the computer.
NOTE: Verify that the power supply being used at the time of the failure is operating correctly. (See “Power On 
Issue” on...

Chapter 4207
Post Codes
These tables describe the POST codes and descriptions during the POST.
Chipset POST Codes
The following table details the chipset POST codes and functions used in the POST.
Code Beeps POST Routine Description 
02h Verify Real Mode 
03h  Disable Non-Maskable Interrupt (NMI) 
04h Get CPU type 
06h Initialize system hardware 
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...

208Chapter 4
3Ah Autosize cache 
3Ch  Advanced configuration of chipset registers 
3Dh Load alternate registers with CMOS values 
42h Initialize interrupt vectors 
45h POST device initialization 
46h  2-1-2-3  Check ROM copyright notice 
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 notice 
50h  Display CPU type and speed 
51h...

Chapter 4209
86h  Re-initialize onboard I/O ports. 
87h  Configure Motherboard Configurable Devices (optional) 
88h  Initialize BIOS Data Area 
89h  Enable Non-Maskable Interrupts (NMIs) 
8Ah  Initialize Extended BIOS Data Area 
8Bh  Test and initialize PS/2 mouse 
8Ch Initialize floppy controller 
8Fh  Determine number of ATA drives (optional) 
90h  Initialize hard-disk controllers 
91h  Initialize local-bus hard-disk controllers 
92h Jump to UserPatch2 
93h  Build MPTABLE for multi-processor boards...

210Chapter 4
* If the BIOS detects error 2C, 2E, or 30 (base 512K RAM error), it displays an additional word-bitmap (xxxx) 
indicating the address line or bits that failed. For example, 2C 0002 means address line 1 (bit one set) has 
failed. 2E 1020 means data bits 12 and 5 (bits 12 and 5 set) have failed in the lower 16 bits. Note that error 
30 cannot occur on 386SX systems because they have a 16 rather than 32-bit bus. The BIOS also sends the 
bitmap to the port-80 LED display. It first displays the...