Acer Aspire 8935g Service Guide
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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 yellow exclamation marks. • There are no device conflicts. • No hardware is listed under Other Devices. 3.Roll back the audio driver to the previous version, if updated recently. 4.Remove and reinstall the audio driver. 5.Ensure that all volume controls are set mid range: a.Click the volume icon on the taskbar and drag the slider to 50. Ensure that the volume is not muted. b.Click Mixer to verify that other audio applications are set to 50 and not muted. 6.Navigate to Start´ Control Panel´ Hardware and Sound´ Sound. Ensure that Speakers are selected as the default audio device (green check mark). NOTE: If Speakers does not show, right-click on the Playback tab and select Show Disabled Devices (clear by default). Start Check M/B SPK cable Re-assemble th e SPK cable to M/B OK NG Ch eck Logic Upper/Logic upper OK Swap Logic lower/Logic u pper OK NG Swap M/B
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 the internal Microphone fails, perform the following actions one at a time to correct the problem. Do not replace non-defective FRUs: Microphone Problems If internal or external Microphones do no operate correctly, perform the following actions one at a time to correct the problem. 1.Check that the microphone is enabled. Navigate to Start´ Control Panel´ Hardware and Sound´ Sound and select the Recording tab. 2.Right-click on the Recording tab and select Show Disabled Devices (clear by default). 3.The microphone appears on the Recording tab. 4.Right-click on the microphone and select Enable. 5.Select the microphone then click Properties. Select the Levels tab. 6.Increase the volume to the maximum setting and click OK. 7.Test the microphone hardware: a.Select the microphone and click Configure. Start Ch eck M/B Mic. cable Re-assemble th e MIC cable to M/B OK NG Check MIC wire of LCD modu le OK Swap MIC wire of LCD modu le OK NG Swap M/B
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 Windows Vista Startup Repair Utility: a.insert the Windows Vista Operating System DVD in the ODD and restart the computer. b.When prompted, press any key to start to the operating system DVD. c.The Install Windows screen displays. Click Next. d.Select Repair your computer. e.The System Recovery Options screen displays. Click Next. f.Select the appropriate operating system, and click Next. NOTE: Click Load Drivers if controller drives are required. g.Select Startup Repair. h.Startup Repair attempts to locate and resolve issues with the computer. i.When complete, click Finish. If an issue is discovered, follow the onscreen information to resolve the problem. 4.Run the Windows Memory Diagnostic Tool. For more information see Windows Help and Support. 5.Restart the computer and press F2 to enter the BIOS Utility. Check the BIOS settings are correct and that CD/DVD drive is set as the first boot device on the Boot menu. 6.Ensure all cables and jumpers on the HDD and ODD are set correctly. 7.Remove any recently added hardware and associated software. 8.Run the Windows Disk Defragmenter. For more information see Windows Help and Support. 9.Run Windows Check Disk by entering chkdsk /r from a command prompt. For more information see Windows Help and Support. 10.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. 11 .Replace the HDD. See “Disassembly Process” on page 54.
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 Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a recurring problem exists. When analyzing an intermittent problem, do the following: 1.Run the advanced diagnostic test for the system board in loop mode at least 10 times. 2.If no error is detected, do not replace any FRU. 3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors. Start Check USB/B to M/B cable Re-assemble th e USB/B cable to M/B OK NG Check USB/B OK Swap USB/B and USB cable OK NG Swap M/B
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 page 196.): 1.Power-off the computer. 2.Visually check them for damage. If any problems are found, replace the FRU. 3.Remove or disconnect all of the following devices: • Non-Acer devices • Printer, mouse, and other external devices •Battery pack • Hard disk drive •DIMM • CD-ROM/Diskette drive Module • PC Cards 4.Power-on the computer. 5.Determine if the problem has changed. 6.If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7.If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU: • System board • LCD assembly
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 POST values 0Eh Initialize I/O component 0Fh Initialize the local bus IDE 10h Initialize Power Management 11h Load alternate registers with initial POST values 12h Restore CPU control word during warm boot 13h Initialize PCI Bus Mastering devices 14h Initialize keyboard controller 16h 1-2-2-3 BIOS ROM checksum 17h Initialize cache before memory autosize 18h 8254 timer initialization 1Ah 8237 DMA controller initialization 1Ch Reset Programmable Interrupt Controller 20h 1-3-1-1 Test DRAM refresh 22h 1-3-1-3 Test 8742 Keyboard Controller 24h Set ES segment register to 4 GB 26h Enable A20 line 28h Autosize DRAM 29h Initialize POST Memory Manager 2Ah Clear 512 KB base RAM 2Ch 1-3-4-1 RAM failure on address line xxxx* 2Eh 1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus 2Fh Enable cache before system BIOS shadow 30h 1-4-1-1 RAM failure on data bits xxxx* of high byte of memory bus 32h Test CPU bus-clock frequency 33h Initialize Phoenix Dispatch Manager 36h Warm start shut down 38h Shadow system BIOS ROM
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 Initialize EISA board 52h Test keyboard 54h Set key click if enabled 58h 2-2-3-1 Test for unexpected interrupts 59h Initialize POST display service 5Ah Display prompt Press F2 to enter SETUP 5Bh Disable CPU cache 5Ch Test RAM between 512 and 640 KB 60h Test extended memory 62h Test extended memory address lines 64h Jump to UserPatch1 66h Configure advanced cache registers 67h Initialize Multi Processor APIC 68h Enable external and CPU caches 69h Setup System Management Mode (SMM) area 6Ah Display external L2 cache size 6Bh Load custom defaults (optional) 6Ch Display shadow-area message 6Eh Display possible high address for UMB recovery 70h Display error messages 72h Check for configuration errors 76h Check for keyboard errors 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 Code Beeps POST Routine Description
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 95h Install CD ROM for boot 96h Clear huge ES segment register 97h Fixup Multi Processor table 98h 1-2 Search for option ROMs. One long, two short beeps on checksum failure 99h Check for SMART Drive (optional) 9Ah Shadow option ROMs 9Ch Set up Power Management 9Dh Initialize security engine (optional) 9Eh Enable hardware interrupts 9Fh Determine number of ATA and SCSI drives A0h Set time of day A2h Check key lock A4h Initialize Typematic rate A8h Erase F2 prompt AAh Scan for F2 key stroke ACh Enter SETUP AEh Clear Boot flag B0h Check for errors B2h POST done - prepare to boot operating system B4h 1 One short beep before boot B5h Terminate QuietBoot (optional) B6h Check password (optional) B9h Prepare Boot BAh Initialize DMI parameters BBh Initialize PnP Option ROMs BCh Clear parity checkers BDh Display MultiBoot menu BEh Clear screen (optional) BFh Check virus and backup reminders C0h Try to boot with INT 19 Code Beeps POST Routine Description
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 check point code, followed by a delay, the high-order byte, another delay, and then the low-order byte of the error. It repeats this sequence continuously. C1h Initialize POST Error Manager (PEM) C2h Initialize error logging C3h Initialize error display function C4h Initialize system error handler C5h PnPnd dual CMOS (optional) C6h Initialize notebook docking (optional) C7h Initialize notebook docking late C8h Force check (optional) C9h Extended checksum (optional) D2h Unknown interrupt Code Beeps For Boot Block in Flash ROM E0h Initialize the chipset E1h Initialize the bridge E2h Initialize the CPU E3h Initialize system timer E4h Initialize system I/O E5h Check force recovery boot E6h Checksum BIOS ROM E7h Go to BIOS E8h Set Huge Segment E9h Initialize Multi Processor EAh Initialize OEM special code EBh Initialize PIC and DMA ECh Initialize Memory type EDh Initialize Memory size EEh Shadow Boot Block EFh System memory test F0h Initialize interrupt vectors F1h Initialize Run Time Clock F2h Initialize video F3h Initialize System Management Mode F4h 1 Output one beep before boot F5h Boot to Mini DOS F6h Clear Huge Segment F7h Boot to Full DOS Code Beeps POST Routine Description