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Chapter 4 • Disassembly and Power
Tech
Tip
Power values for energy-efficient monitors
Always keep the screen saver timeout value shorter than the power saver timeout value,
especially with green (energy-efficient) monitors!
To see if the screen saver causes a problem, use the Display Control Panel and set the
screen saver option to None. Identifying a problem adapter, device, or driver will take Internet
research. Check each adapter, device, and driver one by one. Use the Power Options Control
Panel to change the power scheme. Also check all devices for a Power Management tab on the
Properties dialog box. Changes can be made there.
Links on the left of the Power Options Control Panel provide access to advanced settings
such as requiring a password to come out of sleep mode. The power options for a Windows 7
laptop are shown in Figure 4.29.
Figure 4.29 Windows 7 power settings
Other laptop Power Options Control Panel settings include the following links: Require a
password on wakeup, Choose what the power button does (as shown in Figure 4.29), Choose
what closing the lid does, Create a power plan, Choose when to turn off the display, and
Change when the computer sleeps. Laptop power settings affect battery life. Users and techni-
cians should adjust these settings to best fit how the laptop or mobile device is used.
In Windows Vista and 7, use the Power Options Control Panel to edit the power settings.
Select the Change advanced power settings link to configure passwords, standby power behav-
ior, and other power-related settings. If the computer does not go into the Sleep mode, check
the following:
• Determine if ACPI is enabled in BIOS.
• Try disabling the antivirus program to see if it is causing the problem.
• Set the screen saver to None to see if it is causing the problem.
• Determine if all device drivers are ACPI compliant.
• Determine if power management is enabled through the operating system (use the
Power Options Control Panel).
• Disconnect USB devices to see if they are causing problems.
- Guide to PCs 2
- Complete CompTIA 3
- Contents at a Glance 4
- Contents 10
- Contents 11
- About the Author 19
- Dedication 20
- Acknowledgments 20
- We Want to Hear from You! 21
- Reader Services 21
- It Pays to Get Certified 22
- CompTIA Career Pathway 23
- Steps to Certication 23
- Content Seal of Quality 24
- Why CompTIA? 24
- Introduction 25
- Organization of the Text 26
- Features of This Book 27
- IT work 31
- CompTIA A+ Exam Objectives 32
- CompTIA Exam Objectives 33
- Disassembly 36
- Disassembly Overview 37
- Electrostatic Discharge (ESD) 37
- Opening the Case 41
- Cables and Connectors 41
- Snug connections 43
- Storage Devices 45
- Motherboards 46
- Mobile Device Issues 47
- Reassembly 49
- Preventive Maintenance 49
- Basic Electronics Overview 51
- Electronics Terms 51
- Good connection Broken wire 53
- Power Supply Overview 54
- Power Supply Form Factors 55
- Tech Tip 56
- Purposes of a Power Supply 58
- Power Supply Voltages 60
- Mobile Device Power 61
- Keep Li-ion batteries cool 63
- Power Interface) 64
- Windows power management 65
- Watch the wattage 68
- Solving Power Supply Problems 70
- Adverse Power Conditions 71
- Adverse Power Protection 72
- Surge Protectors 72
- Line Conditioners 74
- Figure 4.32 Line conditioner 75
- Figure 4.33 Sine wave and 75
- Standby Power Supply (SPS) 77
- Electrical Fires 78
- Computer Disposal/Recycling 79
- Chapter Summary 81
- Review Questions 82
- Exercises 85
- External Cables 86
- Computer Case Removal 86
- Adapter Placement 86
- Motherboard 88
- Lab 4.3 Amps and Wattage 89
- Lab 4.4 Continuity Check 89
- Lab 4.5 Pin-Out Diagramming 90
- Lab 4.6 Fuse Check 91
- Lab 4.7 Using a Multimeter 91
- Figure 4.38 AC outlet 93
- GND to hot 120VAC 93
- GND to neutral 0VAC 93
- Hot to neutral 120VAC 93
- +5 volts 95
- +12 volts 95
- Activities 97
- Critical Thinking Skills 99
- A+ Certification Exam Tips 99
- Complete PC Restore tool 107
- FireWire 114
- IRQs (Interrupt Requests) 120
- PBs (petabytes) 129
- Setup program 136
- SSDs (solid state drives) 138
- SSDs (solid state drives) 139
- TBs (terabytes) 140
- troubleshooting 143
- video 145
- Windows 147
- Windows Vista 148
- Windows Vista 149
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