Power On Issue, Computer Shutsdown Intermittently | Acer 4745

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 a non-defective FRUs:

Computer Shutsdown 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 (see “Thermal Unit Failure” on page 118) 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 167.

108

Chapter 4

Image 118

Acer 4745 manual Power On Issue, Computer Shutsdown Intermittently

Contents

Acer Aspire Service Guide Revision History Copyright III Conventions Preface Page Table of Contents Troubleshooting 107 Viii Acer Aspire 4745 Series Microsoft Windows 7 Environment Test Table of Contents Features Chapter Storage Mini CardAudio Optical Drive Communication Dimensions and weightPower subsystem Privacy control Interface Special keys and controlsSoftware Optional Items WarrantyEnvironment System Block Diagram Intel Front View Your Acer Notebook tourIcon Description HDD Left View Closed Front ViewHdmi Right View Indicators Bottom View Icon Function Description TouchPad Basics Function Left Button Right Button Main TouchPad Lock Keys and embedded numeric keypad Using the KeyboardLock key Description Windows Keys Key Description Hot Keys Hotkey Icon Function Description Core Bus Cache Package Acer P/N Speed Hardware Specifications and ConfigurationsSpecification Size Memory Combinations Slot Total Memory System Memory Specification4GB 0MB LAN Module Specification Wireless Module SpecificationBluetooth Specification Hard Disk Drive Interface Specification Super-Multi Drive Module Audio Interface Specification Card Reader Specification Power and Keyboard Controller SpecificationBattery Specification Cell SANYO/SONY/PANASONIC/SAMSUNG/SIMPLO AS2009A Bios Setup Utility Navigating the Bios Utility Parameter Description Aspire 4745 BiosInformation Uuid Main Parameter Description Format/Option Parameter Description Option Disabled orSecurity Clear or Set Setting a Password Removing a Password Changing a Password Continue Boot USB Cdrom Exit Cmos Bios Flash Utilities DOS Flash Utility USB HDDPage WinFlash Utility Remove HDD/BIOS Password Utilities Remove HDD Password Removing Bios Passwords Cleaning Bios Passwords Using Boot Sequence Selector Output Using DMIToolsInput Input dmitools /wu Using the LAN MAC Eeprom Utility Chapter Machine Disassembly and Replacement Disassembly Requirements General Information Pre-disassembly InstructionsDisassembly Process Main Screw List Quantity Part Number External Modules Disassembly Flowchart External Module Disassembly ProcessScrew List Step Quantity Removing the Battery Pack Removing the SD dummy card Removing the Lower Cover Removing the Optical Drive Module Step Size Quantity Screw Type ODD Module M2.5*4L Step Size Quantity Screw Type ODD Bracket M2.0*3L Removing the Dimm Modules Removing the Wlan Module Step Size Quantity Screw Type Wlan Board M2.0*3 Removing the Hard Disk Drive Module Step Size Quantity Screw Type HDD Carrier M3.0*4L Main Unit Disassembly Process Main Unit Disassembly Flowchart Removing the Keyboard Step Size Quantity Screw Type Chapter Removing the Upper Cover Chapter Remove the eight 8 screws from the top cover Removing the Power Switch Board Removing the Function Board Step Size Quantity Screw Type Function Board M2.0*3widehead Removing the Left Speaker Module Step Size Quantity Screw Type Speaker Module M2.5*4L Removing the USB Board Step Size Quantity Screw Type USB Board M2.5*4L Lift the USB Board upward away from the chassis Removing the Bluetooth Module Step Size Quantity Screw Type Bluetooth Board M2.3*3L Removing the LCD Module Removing the Mainboard Step Size Quantity Screw Type LCD Module M2.5*6.5 Chapter Step Size Quantity Screw Type Mainboard M2.5*4L Removing the Thermal Module Removing the CPU Removing the RTC Battery Removing the WiFi Antenna Cable Removing the Right Speaker Step Size Quantity Screw Type Right Speaker 3widehead Module Removing the DC-In Cable Step Size Quantity Screw Type DC-In Cable M2.5*4 LCD Module Disassembly Process LCD Module Disassembly Flowchart Removing the LCD Bezel Step Size Quantity Screw Type LCD Bezel M2.5*4 Removing the Camera Module Removing the LCD Panel Step Size Quantity Screw Type LCD Panel M2.3*3 Removing the FPC Cable Removing the Hinges Removing the Microphone ModuleStep Size Quantity Screw Type LCD Hinges M2.5*3 Removing the Antennas Chapter LCD Module Reassembly Procedure Replacing the MIC and WiFi Antennas Replacing the Microphone Module Replacing the FPC Cable Replacing the LCD Panel Replacing the Webcam Replacing the LCD Bezel Replace the two screws and screw caps as shown Main Module Reassembly Procedure Replacing the DC-In Cable Replacing the LCD Module Replacing the Right Speaker Replacing the RTC Battery Replacing the CPU Replacing the Thermal Module Replacing the Mainboard Chapter Connect the right speaker cable Chapter Replacing the Bluetooth Module Replacing the USB Board Replacing the TouchPad Bracket Replacing the Left Speaker Module Replacing the Power Switch Board Replacing the Function Board Replacing the Upper Cover Page 100 Chapter Replacing the Keyboard Replacing the Hard Disk Drive Module 102 Chapter Replacing the Dimm Modules Replacing the Wlan BoardInsert the Wlan board into the Wlan socket Replacing the ODD Module Replacing the Lower Covers Replacing the Battery Pack Replacing the Dummy Cards Common Problems Symptoms Verified Go To Power On Issue Computer Shutsdown Intermittently No Display Issue No Post or Video Random Loss of Bios Settings Abnormal Video Display LCD Failure Built-In Keyboard Failure TouchPad Failure Internal Speaker Failure Microphone Problems Sound ProblemsSelect Set up microphone Select Repair your computer HDD Not Operating CorrectlySelect Startup Repair ODD Failure ODD Not Operating Correctly Discs Do Not Play Drive Not Detected Wireless Function Failure Thermal Unit Failure External Mouse Failure Other Failures Undetermined Problems Intermittent ProblemsDimm Post Code Range Phase Post Codes Peienterrecoverymode PEI Peimemoryinstall PEIPeiswitchstack PEI Peirecoverymediafound PEI Bdsenumerateallbootoption BDS Bdsinstallhotkey BDSBdsbeforepciioinstall BDS Dxesmmcontrolerinit DXE Bdsenterbootmanager BDS Bdsendofbootselection BDSBdsentersetup BDS Bdsbootdeviceselect BDS Smmacpidisablestart SMM Smmacpienablestart SMMSmmacpienableend SMM Smmacpidisableend SMM 126 Chapter Top View Description Desciption RTC Mini Card Wlan PJ2 Power JackLAN FAN Conn Steps for Clearing Bios Password Check Clearing Password Check and Bios RecoveryClearing Password Check Description Location G1 / G2 Clear Cmos Jumpers WiFi Bay Bios Recovery Hotkey Bios Recovery by Crisis DiskBios Recovery Boot Block Steps for Bios Recovery from USB Storage FRU Field Replaceable Unit List LCD Assembly Acer Aspire 4745 Exploded DiagramsDescription Acer P/N Chassis Assembly Wwan Minicard BEVT-22A23T0 STN HDD-BKTZQ1 ZR6FBZR6004,REV MBSG,PARK,SAM,BT WO Cpuassy BSQ Acer Aspire 4745 FRU List Category Partname Description Acer Part Number ZY9 Bluetooth Speaker L Lower Case Assy W/FFC *2, DC ZQ1 Base SUB JV/65W ODD Bracket ZQ1 ODD BKT MK2565GSX-EUL S.P Sata 8MB LF F/WGJ001J Keyboard ZQ1 K/BUI S.P Mainboard Mainboard UMA HM55 W/CARD ZQ1 MBUMA,BT,WO Heatsink Thermal Module for 35W UMA ZQ1 Thermal Module Screw List Category Partname Description Acer Part Numeber Chapter 145 Acer Aspire 4745 Series Appendix aCountry Acer Description AS4745G-624G64Bn EM W7HP64EMATTH1 MC S2.PSL0 LX.PSM Emea LX.PSM China LX.PSM AAPGctwn LX.PSM TWN S2.PSM LX.PSR Emea LX.PSR AAP Model Country Acer Part No VGA Chip AS4745G Thailand LX.PSL02.018 Ci5520M AS4745G S2.PSL02.003 Ci5430M LX.PSM0C.01 ParkxtLX.PSM0C.00 UMA AS4745 Malaysia LX.PSR0C.011 Ci3330M Model Country Acer Part No Memory SO4GBIII10 SO2GBIII SO4GBIII10LX.PSL0C.00 SO2GBIII10 SO1GBIII10 LX.PSM0C.01 SO2GBIII10 LX.PSM0C.00 SO2GBIII10 LX.PSM0C.00 SO2GBIII10 SO1GBIIILX.PSM0C.00 SO1GBIII10 LX.PSR0C.01 SO2GBIII10 SO2GBIII10 SO1GBIIILX.PSR0C.01 SO1GBIII10 LX.PSR0C.01 SO2GBIII10 SO1GBIII AS4745 Thailand 163 Appendix a 164 Test Compatible Components Appendix B Microsoft Windows 7 Environment Test Vendor Description Sanyo PanasoniSamsung Simplo Bluetooth Sony Intel PMDP600 Intel HDD Seagate 4KSBRToshiba MK3265GSX Sata 8MB LF F/WGJ002J Wxgags AC4TA1 AcerNLED14 AUO NLED14 CMO SO1GBIII Hynix SO1GBIII ElpidaSO2GBIII Elpida SO2GBIII Hynix SO1GBIII Smart KN.1GBBB.03KN.2GBBB.02 KN.1GBBS.00 NBDCB4 Plds NBDRW4 PanasoniNSM8XS Panasoni NSM8XS Plds WiFi Antenna Lan Intel Wlan 633AN.HMWG Online Support Information Appendix C 168 Index 170