Power On Issue, Computer Shuts down Intermittently | Acer 4235

Power On Issue

If the system doesn’t power on, perform the following actions one at a time to correct the problem. Do not replace non-defective FRUs:

Start
	OK
		Swap
Check	NG	AC/Battery
AC/Batt	NG
AC/Batt
only power
on

OK

Swap M/B

Computer Shuts down Intermittently

If the system powers off at intervals, perform the following actions one at a time to correct the problem.

1.Check the power cable is properly connected to the computer and the electrical outlet.

2.Remove any extension cables between the computer and the outlet.

3.Remove any surge protectors between the computer and the electrical outlet. Plug the computer directly into a known good electrical outlet.

4.Disconnect the power and open the casing to check the Thermal Unit and fan airways are free of obstructions.

5.Remove all external and non-essential hardware connected to the computer that are not necessary to boot the computer to the failure point.

6.Remove any recently installed software.

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

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Chapter 4

Image 149

Acer 4235, 4535G manual Power On Issue, Computer Shuts down Intermittently, AC/Battery

Contents

Aspire 4535/4535G/4235 Series Service Guide Revision History Copyright Problems Gives precautionary measures toProcedures Following conventions are used in this manual Preface Page Table of Contents 139 Clearing Password Check Clearing Password Check and Bios RecoveryBios Recovery by Crisis Disk Top View Chapter Features Power subsystem Dimensions and WeightCommunication Privacy control Modem RJ-11 port DC-in jack for AC adapter Environment System Block Diagram Your Acer Notebook tour Indicates when the hard disk drive isFront View Icon Description Closed Front View Hdmi Left View Rear View Right View Icon Function Description Bottom ViewEasy-Launch Buttons Function Left Button Right Button Main touchpad Touchpad Basics with fingerprint reader Lock Keys and embedded numeric keypad Using the Keyboard Key Description Windows Keys Euro symbol Using the System UtilitiesSpecial Key US dollar sign Acer GridVista dual-display compatible Processor Specification Hardware Specifications and ConfigurationsProcessor Specifications System Board Major Chips Specifications Supported Protocols Bios ROM Memory Combinations Slot Total Memory System Memory Specifications 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 LCD Specification Super-Multi Combo Module Specification Keyboard Specification VGA Graphic Controller SpecificationAudio Interface Specification Bluetooth Specification Battery Finger Print Reader Specification Navigating the Bios Utility Bios Setup Utility Setup System Bios VersionInformation CPU Speed Disabled Enables or disables the Press F12 to display bootMain Parameter Description Format/Option Security Disabled orParameter Description Option Clear or Set Removing a Password Setting a Password Enter New Password Changing a Password USB KEY Boot Cmos Exit Bios Flash Utilities DOS Flash Utility Execute the KBYF010.BAT batch file to update Bios Flash process begins as shown Plug in the AC power to continue Chapter WinFlash Utility Progress screen displays Chapter Remove HDD Password Remove HDD/BIOS Password UtilitiesThis section provide you with removing HDD/BIOS method Cleaning Bios Passwords Removing 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 Disassembly Requirements Machine Disassembly and Replacement Disassembly Process Pre-disassembly InstructionsGeneral 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 Cover Removing the Lower Covers Remove the HDD Cover as shown Chapter Removing the Wlan Module Remove the Wlan Module as shown Chapter Step Size Quantity Screw Type Wlan Module M2*3 Removing the Dimm Modules Removing the Hard Disk Drive Module Lift the HDD carrier to remove Step Size Quantity Screw Type HDD Carrier M3*3 Step Size Quantity Screw Type ODD Module M2.5*5 Removing the Optical Disk Drive Module Step Size Quantity Screw Type ODD Bracket M2*3 Main Unit Disassembly Flowchart Main Unit Disassembly Process Step Size Quantity Screw Type Hinge Covers M2*3 Removing the Hinge Covers Step Size Quantity Screw Type Removing the Switch Cover Chapter Removing the Keyboard Step Size Quantity Screw Type Speaker Module M2.5*3 Removing the Speaker ModulePage 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 Carefully remove the LCD Module from the chassis Remove the two securing screws from the right LCD hinge Upper Cover M2.5*5 Red callout M2.5*3 Green callout Chapter Removing the Upper Cover Chapter Page Step Size Quantity Screw Type Function Board M2*3 Removing the Function Board 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 Step Size Quantity Screw Type Modem Module M2*3 Removing the Modem Module Chapter Step Size Quantity Screw Type Mainboard M2.5*3 Removing the Mainboard Removing the RJ-11 Port Page Step Size Quantity Screw Type Thermal Module 5*3.2 Removing the Thermal ModulePage Removing the CPU LCD Module Disassembly Flowchart LCD Module Disassembly Process Step Size Quantity Screw Type LCD Bezel M2.5*5 Removing the LCD Bezel Lift the bezel away from the panel Chapter Step Size Quantity Screw Type Camera Module M2.5*3 Removing the Camera Module 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 Replacing the CPU Main Module Reassembly Procedure Replacing the Thermal Module Chapter 105 Connect fan cable to the mainboard as shown Replacing the RJ-11 Port Insert the cable through the casing to the top side as shown Replacing the Mainboard Insert the single securing screw Replacing the USB Board Replacing the Bluetooth Board Step Size Quantity Screw Type Replacing the Modem Module Secure the Modem cable in place with the adhesive tape Replacing the TouchPad Bracket 114 Chapter Replacing the Finger Print Reader 116 Chapter Chapter 117 Replacing the Function Board Replacing the Upper Cover Page Upper Cover M2.5*10 Red call out M2.5*5 Green callout Replace the two securing screws in the Upper Cover Chapter 121 Replacing the LCD Module Reconnect the Microphone cable to the Mainboard as shown Page 124 Chapter Replacing the Speaker Module Replace the two securing screws as shown Replacing the KeyboardPage Replacing the Switch Cover Step Size Quantity Screw Type Replacing the Hinge Covers Replacing the ODD Module External Module Reassembly Process 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 Symptoms Verified Go To Common Problems AC/Battery Power On IssueComputer Shuts down Intermittently AC/Batt No Post or Video No Display Issue Abnormal Video Display Random Loss of Bios Settings LCD Failure Chapter 145 Built-In Keyboard Failure Touchpad Failure Chapter 147 Internal Speaker Failure Sound Problems Internal Microphone Failure Microphone ProblemsSelect Set up microphone Select Startup Repair HDD Not Operating CorrectlySelect Repair your computer ODD Not Operating Correctly ODD Failure Discs Do Not Play Drive Not Detected USB Failure Rightside Chapter 155 Wireless Function Failure Bluetooth Function Failure Function/B Easy Button FailureFFC to M/B To M/B FFC Fingerprint Reader Failure Chapter 159 Thermal Unit Failure External Mouse Failure MB Cmos Discharge Other Failures Intermittent ProblemsUndetermined Problems Code Beeps Post Routine Description Post Codes Tables 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 Steps for Clearing Bios Password Check Clearing Password CheckHardware Open Gap Description Description Location Clear Cmos Jumper Memory bay Bios Recovery Boot Block Bios Recovery by Crisis DiskBios Recovery Hotkey Steps for Bios Recovery by Crisis Disk FRU Field Replaceable Unit List Main Module Aspire 4535/4535G/4235 Exploded Diagrams HDD Door Memory Cover MiniPCI Door Lower Cover Chapter 175 Base Cable Aspire 4535/4535G/4235 FRU ListCategory Description Acer PN Board Category Description Acer PN Case/Cover/Bracket Assembly Keyboard Combo Drive Super Multidrive 6M.PBP02.003 42.PAA02.007LK.14005.006 220NIT 8MS LK.14005.008 200NIT 8MS LK.14005.008 LK.14005.006LK.14006.009 LK.14008.001 6M.PBP02.006 60.PAA02.007 Miscellaneous Speaker Category Description Acer PN Screw Screw List 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 Appendix B Test Compatible Components Brand Microsoft Windows Vista Environment Test Type Description Appendix B 213 Appendix B Camera Appendix B 215 Card Bus1 Appendix B 217 HDD Appendix B 219 Appendix B Appendix B 221 Appendix B Appendix B 223 Keyboard LAN Appendix B 225 226 Appendix B 227 228 Appendix B 229 230 Appendix B 231 232 Modem Appendix B 233 Toshiba NSM8XS Appendix B 235 Southbridge Chipset Type Description VGA Chip Appendix B 237 238 Appendix B 239 240 Appendix C Online Support Information 242 243 Index 244 ODD