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Acer 4535G, 4235 manual Random Loss of Bios Settings

Models: 4535G 4235

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Random Loss of BIOS Settings

If the computer is experiencing intermittent loss of BIOS information, perform the following actions one at a time to correct the problem.

1.If the computer is more than one year old, replace the CMOS battery.

2.Run a complete virus scan using up-to-date software to ensure the computer is virus free.

3.If the computer is experiencing HDD or ODD BIOS information loss, disconnect and reconnect the power and data cables between devices.

If the BIOS settings are still lost, replace the cables.

4.If HDD information is missing from the BIOS, the drive may be defective and should be replaced.

5.Replace the Motherboard.

6.If the Issue is still not resolved, see “Online Support Information” on page 241.

Chapter 4

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Acer 4535G, 4235 manual Random Loss of Bios Settings

Contents

Aspire 4535/4535G/4235 Series Service Guide Revision History Copyright Gives precautionary measures to ProblemsProcedures Following conventions are used in this manual Preface Page Table of Contents 139 Clearing Password Check and Bios Recovery Clearing Password CheckBios Recovery by Crisis Disk Top View Features Chapter Dimensions and Weight Power subsystemCommunication Privacy control Environment Modem RJ-11 port DC-in jack for AC adapter System Block Diagram Indicates when the hard disk drive is Your Acer Notebook tourFront View Icon Description Closed Front View Left View Hdmi Right View Rear View Icon Function Description Bottom ViewEasy-Launch Buttons Touchpad Basics with fingerprint reader Function Left Button Right Button Main touchpad Using the Keyboard Lock Keys and embedded numeric keypad Windows Keys Key Description Using the System Utilities Euro symbolSpecial Key US dollar sign Acer GridVista dual-display compatible Hardware Specifications and Configurations Processor SpecificationProcessor Specifications System Board Major Chips Specifications Bios ROM Supported Protocols System Memory Specifications Memory Combinations Slot Total Memory Hard Disk Drive Interface Specifications Internal transfer Rate Mbits/sec Max Data transfer Rate Mbytes/sec Max DC Power Requirements VoltagePerformance Specifications Buffer size Interface Super-Multi Combo Module Specification LCD Specification VGA Graphic Controller Specification Keyboard SpecificationAudio Interface Specification Bluetooth Specification Finger Print Reader Specification Battery Bios Setup Utility Navigating the Bios Utility System Bios Version SetupInformation CPU Speed Enables or disables the Press F12 to display boot DisabledMain Parameter Description Format/Option Disabled or SecurityParameter Description Option Clear or Set Setting a Password Removing a Password Changing a Password Enter New Password Boot USB KEY Exit Cmos Bios Flash Utilities Execute the KBYF010.BAT batch file to update Bios DOS Flash Utility Plug in the AC power to continue Chapter Flash process begins as shown WinFlash Utility Progress screen displays Chapter Remove HDD Password Remove HDD/BIOS Password UtilitiesThis section provide you with removing HDD/BIOS method Removing Bios Passwords Cleaning Bios Passwords Miscellaneous Utilities Using Boot Sequence SelectorUsing DMITools Using the LAN MAC Eeprom Utility DOS mode, run the MAC.BAT file to write MAC values to eeprom Machine Disassembly and Replacement Disassembly Requirements Pre-disassembly Instructions Disassembly ProcessGeneral Information Main Screw List Description Quantity Acer P/N Screw List Step Quantity External Module Disassembly ProcessExternal Modules Disassembly Flowchart Removing the Battery Pack Removing the SD Dummy Card Removing the Lower Covers Cover Remove the HDD Cover as shown Chapter Removing the Wlan Module Step Size Quantity Screw Type Wlan Module M2*3 Remove the Wlan Module as shown Chapter Removing the Dimm Modules Removing the Hard Disk Drive Module Step Size Quantity Screw Type HDD Carrier M3*3 Lift the HDD carrier to remove Removing the Optical Disk Drive Module Step Size Quantity Screw Type ODD Module M2.5*5 Step Size Quantity Screw Type ODD Bracket M2*3 Main Unit Disassembly Process Main Unit Disassembly Flowchart Removing the Hinge Covers Step Size Quantity Screw Type Hinge Covers M2*3 Removing the Switch Cover Step Size Quantity Screw Type Chapter Removing the Keyboard Removing the Speaker Module Step Size Quantity Screw Type Speaker Module M2.5*3Page Lift the securing tape to expose the Antenna cable as shown Removing the LCD ModuleStep Size Quantity Screw Type LCD Module M2.5*5 Page Chapter Remove the two securing screws from the left LCD hinge Remove the two securing screws from the right LCD hinge Carefully remove the LCD Module from the chassis Removing the Upper Cover Upper Cover M2.5*5 Red callout M2.5*3 Green callout Chapter Chapter Page Removing the Function Board Step Size Quantity Screw Type Function Board M2*3 Lift the bracket clear of the casing Chapter Removing the Finger Print ReaderStep Size Quantity Screw Type Finger Print M2*3 Reader Chapter Removing the TouchPad Bracket Remove the TouchPad Bracket from the Upper Cover Remove the two screws from the TouchPad BracketStep Size Quantity Screw Type TouchPad M2*3 Bracket Removing the RTC Battery Removing the Bluetooth Module Bluetooth Module Remove the USB Board from the Lower Cover Removing the USB BoardStep Size Quantity Screw Type USB Board M2.5*3 Removing the Modem Module Step Size Quantity Screw Type Modem Module M2*3 Chapter Removing the Mainboard Step Size Quantity Screw Type Mainboard M2.5*3 Removing the RJ-11 Port Page Removing the Thermal Module Step Size Quantity Screw Type Thermal Module 5*3.2Page Removing the CPU LCD Module Disassembly Process LCD Module Disassembly Flowchart Removing the LCD Bezel Step Size Quantity Screw Type LCD Bezel M2.5*5 Lift the bezel away from the panel Chapter Removing the Camera Module Step Size Quantity Screw Type Camera Module M2.5*3 Removing the LCD Panel Lift the LCD Panel out of the casing as shown Removing the LCD Brackets and FPC Cable Removing the Antennas Removing the MIC Module Replacing the Antennas LCD Module Reassembly ProcedureReplacing the MIC Module Page Chapter Replacing the LCD Panel 100 Chapter Replacing the Camera Module Replacing the LCD Bezel Main Module Reassembly Procedure Replacing the CPU Replacing the Thermal Module Connect fan cable to the mainboard as shown Chapter 105 Replacing the RJ-11 Port Replacing the Mainboard Insert the cable through the casing to the top side as shown Insert the single securing screw Replacing the USB Board Replacing the Bluetooth Board Step Size Quantity Screw Type Replacing the Modem Module Replacing the TouchPad Bracket Secure the Modem cable in place with the adhesive tape 114 Chapter Replacing the Finger Print Reader 116 Chapter Replacing the Function Board Chapter 117 Replacing the Upper Cover Page Replace the two securing screws in the Upper Cover Upper Cover M2.5*10 Red call out M2.5*5 Green callout Replacing the LCD Module Chapter 121 Reconnect the Microphone cable to the Mainboard as shown Page 124 Chapter Replacing the Speaker Module Replacing the Keyboard Replace the two securing screws as shownPage Replacing the Switch Cover Step Size Quantity Screw Type Replacing the Hinge Covers External Module Reassembly Process Replacing the ODD Module Place the HDD carrier on the HDD Replacing the Hard Disk Drive ModuleReplace the securing screw Replace the four securing screws two each side Insert the Wlan board into the Wlan socket Replacing the Dimm ModulesReplacing the Wlan Module Replace the two screws to secure the module Replace the Lower Covers and secure the captive screws Replacing the Lower CoversReplacing the SD Dummy Card Replacing the Battery 138 Chapter Common Problems Symptoms Verified Go To Power On Issue AC/BatteryComputer Shuts down Intermittently AC/Batt No Display Issue No Post or Video Abnormal Video Display Random Loss of Bios Settings LCD Failure Built-In Keyboard Failure Chapter 145 Touchpad Failure Internal Speaker Failure Chapter 147 Sound Problems Internal Microphone Failure Microphone ProblemsSelect Set up microphone Select Startup Repair HDD Not Operating CorrectlySelect Repair your computer ODD Failure ODD Not Operating Correctly Discs Do Not Play Drive Not Detected USB Failure Rightside Wireless Function Failure Chapter 155 Bluetooth Function Failure Easy Button Failure Function/BFFC to M/B To M/B FFC Fingerprint Reader Failure Thermal Unit Failure Chapter 159 External Mouse Failure MB Cmos Discharge Other Failures Intermittent ProblemsUndetermined Problems Post Codes Tables Code Beeps Post Routine Description 164 Chapter Code Beeps Post Routine Description Code Beeps For Boot Block in Flash ROM Top View Bottom View LS-4921P Function Board 170 Chapter Clearing Password Check Steps for Clearing Bios Password CheckHardware Open Gap Description Description Location Clear Cmos Jumper Memory bay Bios Recovery by Crisis Disk Bios Recovery Boot BlockBios Recovery Hotkey Steps for Bios Recovery by Crisis Disk FRU Field Replaceable Unit List Aspire 4535/4535G/4235 Exploded Diagrams Main Module Base HDD Door Memory Cover MiniPCI Door Lower Cover Chapter 175 Cable Aspire 4535/4535G/4235 FRU ListCategory Description Acer PN Board Case/Cover/Bracket Assembly Category Description Acer PN Keyboard Super Multidrive Combo Drive 42.PAA02.007 6M.PBP02.003LK.14005.006 220NIT 8MS LK.14005.008 200NIT 8MS LK.14005.006 LK.14005.008LK.14006.009 LK.14008.001 60.PAA02.007 6M.PBP02.006 Speaker Miscellaneous Screw List Category Description Acer PN Screw Chapter 185 Appendix a 186 Appendix aAspire 4535/4535G/4235 Series Appendix a Appendix a 188 Thailand LX.PBH0C.011 AS4535G-722G25Mn Appendix a 190 Thailand LX.PBG0C.003 AS4535G-862G50Mn Appendix a 192 China LX.PBF0C.005 AS4535-641G25Mn Appendix a 194 USA Appendix a 196 Acla Appendix a 198 LCD VGA Vram Appendix a 200 NLED14WXGAG UMA SO2GBII6 SO1GBII6 Appendix a 202 741G25Mn AS4535 Appendix a 204 ODD Appendix a 206 3rd WiFi 1x2 BGN 742G25Mn AS4535G Appendix a 208 3rd WiFi 1x2 BGN AS4535-822G32Mn Appendix a 210 Test Compatible Components Appendix B Microsoft Windows Vista Environment Test Brand Appendix B 213 Type Description Appendix B Appendix B 215 Camera Card Bus1 Appendix B 217 HDD Appendix B 219 Appendix B Appendix B 221 Appendix B Appendix B 223 Keyboard Appendix B 225 LAN 226 Appendix B 227 228 Appendix B 229 230 Appendix B 231 232 Appendix B 233 Modem Toshiba NSM8XS Appendix B 235 Southbridge Chipset Appendix B 237 Type Description VGA Chip 238 Appendix B 239 240 Online Support Information Appendix C 242 Index 243 ODD 244