Power On Issue, Computer Shutsdown Intermittently | eMachines D720

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 120) and fan airways are free of obstructions.

5.Disable the power management settings in the BIOS to ensure they are not the cause of the problem (see “Power” on page 29).

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

7.Remove any recently installed software.

8.If the Issue is still not resolved, see “Online Support Information” on page 161.

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Chapter 4

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eMachines D720 manual Power On Issue, Computer Shutsdown Intermittently

Contents

EMachines D720/D520 Series Service Guide Revision History Copyright III Conventions Preface Page Table of Contents 107 Viii Model Definition and Configuration 142 Table of Contents Features Chapter Privacy control Power subsystemCommunication Special keys and controls System Block Diagram Front View Your Acer Notebook tourIcon Description HDD Closed Front ViewRear View Icon Description Latch Locks and releases the lid Left View Right View Bottom View Indicators Icon Function Description 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 Hot Keys Hotkey Icon Function Description Special Key Euro symbolUS dollar sign Using the System Utilities Acer GridVista dual-display compatible Processor Specification Hardware Specifications and ConfigurationsICH9-M Wireless Module 802.11b/g Specification System Memory SpecificationLAN Interface Specification Memory Combinations Slot Total Memory 8MB Hard Disk Drive Interface SpecificationSata Keyboard Specification Super-Multi Drive Module SpecificationAudio Interface Specification System Board Major Chips Controller Battery Specification LCD Specification Bios Setup Utility Navigating the Bios Utility Information Parameter Description Main Parameter Description Format/Option LAN IDE AdvancedParameter Description Submenu Items IGD TV URR USBAspm FER Parameter Description Option Disabled orSecurity Clear or Set Setting a Password Removing a Password Changing a Password Emttm PowerDTS Acpi S3 Boot IDE0 Hitachi HTS542516K9SA00 Exit Exit Saving Changes Bios Flash Utilities DOS Flash Utility USB HDD ABC USB CdromPage WinFlash Utility Remove HDD/BIOS Password Utilities Remove HDD Password Key in biospw 14452 Removing Bios Passwords Cleaning Bios Passwords 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 Wlan HDD Removing the Lower CoversStep Size Quantity Screw Type Memory Cover M2.5*8 Remove the Wlan cover as shown Removing the Dimm Modules Removing the Wlan Module Step Size Quantity Screw Type Wlan Module M2*L3 Chapter Removing the Hard Disk Drive Module Step Size Quantity Screw Type HDD Carrier M3*3 Removing the Optical Drive Module Step Size Quantity Screw Type ODD Module M2.5*5 Step Size Quantity Screw Type ODD Bracket M2*L3 Main Unit Disassembly Process Removing the Switch Cover Step Size Quantity Screw Type Switch Cover M2.5*5 Chapter Removing the Keyboard Removing the Antenna Page Removing the LCD Module Step Size Quantity Screw Type LCD Module M2.5*8 Step Size Quantity Screw Type Step Size Quantity Screw Type Upper Cover M2.5*8 Removing the Upper CoverStep Size Quantity Screw Type Upper Cover M2.5*5 Disconnect a as shown Chapter Removing the TouchPad Bracket Step Size Quantity Screw Type TouchPad Bracket M2*L3 Chapter Removing the Speaker Modules Remove the Speaker Modules from the upper cover Removing the Power Board Removing the Modem Module Step Size Quantity Screw Type Modem Module M2*L3 Removing the Main Board Step Size Quantity Screw Type Mainboard M2.5*5 Chapter Removing the CPU Fan Step Size Quantity Screw Type Mainboard M2.5*4 Removing the Thermal Module Step Size Quantity Screw Type Thermal Module M2.5*6.5 Removing the CPU LCD Module Disassembly Process Removing the LCD Bezel Step Size Quantity Screw Type LCD Bezel M2.5*5 Removing the Inverter Board Step Size Quantity Screw Type Inverter Board M2.5*5 Removing the Camera Module Step Size Quantity Screw Type Camera Module M2*L3 Removing the LCD Panel Step Size Quantity Screw Type LCD Panel M2.5*5 Removing the LCD Brackets and FPC Cable Step Size Quantity Screw Type LCD Brackets M2*L3 Removing the Antennas Removing the MIC Module LCD Module Reassembly Procedure Replacing the LCD PanelPage Chapter Page Replacing the LCD Bezel Replacing the CPU Main Module Reassembly ProcedureReplacing the Thermal Module Replacing the Mainboard Replacing the CPU Fan ModuleAlign the Fan Module on the screw brackets Replacing the Modem Module Replacing the Power Board Replacing the Speaker Module Chapter Replacing the TouchPad Bracket Replacing the Upper Case Chapter Replacing the LCD Module Chapter Replacing the Antenna Cable Replacing the Keyboard Replacing the Switch Cover Replacing the ODD Module Replacing the Hard Disk Drive Module Place the HDD in the HDD carrier Replacing the Dimm Modules Replacing the Wlan ModuleInsert the Wlan board into the Wlan socket Replacing the Lower Covers Replace the Memory Cover Replace the Wlan Cover Replacing the Battery 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 Sound Problems Select Set up microphone Microphone ProblemsInternal Microphone Failure 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 Modem Function Failure Thermal Unit Failure External Mouse Failure Other Failures Undetermined Problems Intermittent ProblemsDimm Memory Post CodesSec Code Description BDS & Specific action Each Peim entry point used in 80PORT Each Driver entry point used in 80PORT Fvbservice CF9RESETBootpriority Smbios Setuputility LegacybiosLegacybiosplatform Fwblockservice Each SmmDriver entry point used in 80PORT Top View Bottom View Steps for Clearing Bios Password Check Clearing Password Check and Bios RecoveryClearing Password Check Hardware Open Gap Description Bios Recovery Hotkey Bios Recovery by Crisis DiskBios Recovery Boot Block Steps for Bios Recovery from USB Storage FRU Field Replaceable Unit List Main Assembly EMachines D720/D520 Exploded DiagramsDescription Acer P/N LCD Panel EMachines D720/D520 FRU List Multi Drive Category Description Acer Part NoCPU/Processor Combo Drive Keyboard LCD Panel G 14.1 Wxga Samsung LTN141W3-L01-J Assy LCD Module 14.1 IN. Wxga Glare W/ANTENNA CCDLCD Panel G 14.1 Wxga AUO B141EW04 LCD Panel G 14.1 Wxga CMO N141I3-L02 Screw List Chapter 141 EMachines D720/D520 Series Appendix aModel Country Acer Part No Description China AAP TWN Gctwn Model Country Acer Part No Description CPU LCD Appendix a 148 571G12Mi 4KS 149 Appendix a 150 571G12Mi 4KS 151 Appendix a 152 Test Compatible Components Appendix B Microsoft Windows Vista Environment Test Intel Vendor Type DescriptionCPU Test Mvpqs Vendor Type Description HDD Test LAN Test Northbridge Chipset Test Vendor Type Description LCD TestModem Test ODD Test Southbridge Chipset Test Wlan Test 160 Online Support Information Appendix C 162 Index 164