Texas Instruments 660

Field Service 6-21

6.5.11 Removing/Replacing the LED PWB Assembly

The procedure for removing and replacing the LED PWB Assembly is as follows:

1. Turn off the computer; disconnect the AC power adapter (if attached), and

remove the battery packs as described in Paragraphs 6.5.1 and 6.5.2.

2. Press the Cover Release Latch and open the notebook to a full 180 degree

position.

3. Remove the Keyboard Assembly as described in Paragraph 6.5.6.

4. Remove the Heat Sink Assembly as described in Paragraph 6.5.7.

5. Remove the Cover-Display Assembly as described in Paragraph 6.5.9.

6. Remove the Top Cover Assembly as described in Paragraph 6.5.10.

7. Remove two screws and remove the LED PWB from the Top Cover Assembly.

8. Reassembly is the reverse of Steps 1 through 7.

Figure 6-15 Removing/Replacing the LED PWB Assembly

Top Cover

Assembly

LED Board

Assembly

Contents

Main Page Preface Introduction Intended Audience Contents Page Contents Preface Section 1 General Description Section 2 Installation Section 2 Installation (continued) Section 3 Operating Instructions Section 4 Theory of Operation Section 5 Troubleshooting Procedures Section 6 Field Service Section 6 Field Service (continued) Appendix A Schematic Diagrams 1 General Description 1.1 Introduction 1.2 Product Overview 1.3 Extensa 660 Series Notebook Features Page Figure 1-2 660 Series Notebook External Features 1.3.1 V ideo Display Features Bottom of Notebook Left Side of Notebook Page 1.3.2 Keyboard Features 1.3.3 Software Features 1.3.4 Standard Peripheral Devices 1.3.5 660 Series Connectivity Features 1.3.6 Expansion Capabilities 1.3.7 Advanced PCI Card Options Bottom of Notebook 1.3.8 PCMCIA Card Options 1.4 Notebook Batteries 1.4.1 Deter mining Battery Charge Level Charge Indicators Charge Display Button 1.5 Standard Test Features 1.5.1 Power On Self Test 1.5.2 PC-Doctor Diagnostics Program Page 1.6 Extensa 660 Series Specifications 1-16 General Description Built-in Mouse Device Video Subsystem LCD Aspect Ratio Video Memory Size RS-232-D Serial Port: Transfer Data Rate Connector Type Method: 16550 UART Support Selectable Serial Port (BIOS Setup) 1.7 Regulatory Agency Approvals 2 Installation 2.1 Introduction 2.2 Unpacking Instructions 2.3 Installing Internal Notebook Options 2.3.1 Installing Main Memory Expansion (Optional) 2.3.2 Setting up the Software 2.3.3 Installing Advanced PCI Option Card 2.3.4 Installing PCMCIA Options Bottom of Notebook Page 2.4 Installing External Notebook Options 2.4.1 Installing Ext. Keyboard/Mouse/Numeric Keypad 2-8 Installation 2.4.2 Installing an Exter nal Parallel Printer PIN Note: Figure 2-5 Parallel Port Pinouts PARALLEL PORT PINOUTS 2.4.3 Installing an Exter nal Serial Port Device 2.4.4 Installing an Exter nal VGA Monitor 2.5 Battery Pack Installation 2.6 Installing the AC Power Adapter 2.7 Initial Software Load 2.8 Backing Up System Files 2.9 Demo Program 2.9.1 Stopping the Demo Program 2.9.2 Running the Demo Again 2.10 Initial System Checkout Page 3 Operating Instructions 3.1 Introduction 3.2 Controls/Indicators 3.2.1 Power On/Of f Switch 3.2.2 Notebook LEDs 3.2.3 LED Icons 3.2.4 Keyboard Hot Key Sequences Using the Internal Numeric Keypad A Table 3-2 Summary of Notebook Hot Key Sequences Function Key Sequence 3.2.4.1 Windows 95 Special Keys 3.2.4.2 DOS Special Keys 3.3 Configuring the Glidepad 3.4 Using a CD-ROM Drive 3.4.1 Auto Speed/Max Speed Settings 3.4.2 Inserting a CD into the Drive 3.4.3 Handling CDs 3.5 Built-in Sound System 3.6 Using Remote Connections 3.6.1 Using the Fast Infrared (FIR) Port 3.6.2 Using Zoomed V ideo Features 3.6.3 MPEG PC Card 3.7 Battery Saving Tips 3.7.1 Lowering Inactivity T imeouts 3.7.2 Suspending Operation While Idle 3.7.3 Responding to a Low Battery Condition 3.7.4 Replacing the battery 3.7.5 Saving to Disk 4 Theory of Operation 4.1 Introduction 4.2 Notebook Functional Overview 4-2 Theory of Operation Figure 4-1 Extensa Functional Block Diagram 4.2.1 System Processor 4.2.2 Memory Subsystem 4.2.2.1 Main Memory 4.2.2.2 Flash ROM Page 4.2.4 V ideo Subsystem 4.2.5 Sound Subsystem 4.2.6 Keyboard Subsystem 4.2.7 Hard Disk Drive Subsystem 4.2.7.1 Hard Disk Drive Power Management 4.2.8 Floppy Disk Drive Subsystem 4.2.9 Power Subsystem Page 5 Troubleshooting Procedures 5.1 Introduction 5.2 Overview of Fault Isolation Process 5-2 Troubleshooting Procedures Figure 5-1 Notebook Computer Troubleshooting Flow Chart SEE PARAGRAPHS 5.3.3.1 and 5.3 .3.2 Press Power button; Selftest automatically runs when power turned on. 5.3 Troubleshooting Procedures 5.3.1 T roubleshooting a Power Supply Problem 5.3.2 T roubleshooting a Display Problem Page 5.3.3 Fault Isolation Using Power On Self Test 5.3.3.1 POST Error Messages 5-6 Troubleshooting Procedures Table 5-2 Power On Self Test Error Messages Message Possible Cause Action Table 5-2 POST Error Messages (continued) Message Possible Cause Action 5-8 Troubleshooting Procedures 5.3.3.2 POST Beep Error Messages Table 5-2 POST Erro r Messages (conti nued) hex-value Message Possible Cause Action hex- value Beep Code Port 80h Description 5-10 Troubleshooting Procedures Table 5-3 Self Test Beep Messages Beep Code Port 80h Description 5.3.4 Run T ime Error Messages xxxxh interrupt at address address 5.3.5 PCMCIA Modem Problems 5.4 General Fault Isolation Procedures Table 5-5 General Troubleshooting Procedures 5-14 Troubleshooting Procedures Table 5-5 General Troubleshooting Procedures (continued) 5.5 Fault Isolation Using Diagnostics 5.5.1 PC-Doctor (In DOS Mode or DOS W indows) 5.5.2 Supporting Online Documentation 5.5.3 User Inter face to PC-Doctor 5.5.4 Quitting PC-Doctor 5.6 Board Level Troubleshooting Procedures 5-18 Troubleshooting Procedures Figure 5-2 System Fails to Boot, Initial Checks System Fails to Boot: Initial Tests Memory Interface Tests Figure 5-3 Memory Interface Troubleshooting Diagram END 5-20 Troubleshooting Procedures Figure 5-4 CRT Interface Troubleshooting Diagram 3System Fails to Boot: CRT Interface Checks Figure 5-5 FDD Interface Troubleshooting Diagram 4 No END System Fails to Boot: FDD Interface Check HDD Interface Checks 5-22 Troubleshooting Procedures Figure 5-6 HDD Interface Troubleshooting Diagram Figure 5-7 Keyboard Interface Troubleshooting Diagram System fils to boot: Keyboard Interface Checks CD-ROM Interface Checks 5-24 Troubleshooting Procedures Figure 5-8 CD-ROM Interface Troubleshooting Diagram System Fails to Boot: Glide Pad Interface Checks 8 END Check CN21 Pin3 5-26 Troubleshooting Procedures System Fails to Boot: DC/DC Converter Interface Checks Figure 5-11 Battery Charger Interface Troubleshooting Diagram System Fails to Boot: Battery Charger Interface Checks 10 END END 5-28 Troubleshooting Procedures 11 LED Indicator Function Troubleshooting Figure 5-13 Serial Port Function Troubleshooting Diagram Check Transmitting END System Boots: Serial Port Checks Suspend Function Troubleshooting 5-30 Troubleshooting Procedures Figure 5-14 Suspend Function Troubleshooting Diagram 13 END System Boots: Cover Switch Function Checks Check COVSW#: System Boots: Cover Close Function Checks END 5-32 Troubleshooting Procedures System Boots: External Keyboard Checks System Boots: PS/2 External Mouse Interface Check Figure 5-19 Printer Port Interface Troubleshooting Diagram END System Boots: Printer Port Interface Checks Page 6 Field Service 6.1 Introduction 6.2 Preventive Maintenance 6.2.1 Cleaning the Computer 6.2.2 Handling the Computer 6.2.3 Handling the Computer Battery Pack 6.2.4 Password Caution 6.3 Required Tools and Equipment 6.4 Notebook FRUs 6.4.1 Cover-Display Assembly 6.4.2 System Base Assembly Page Field Service 6-7 Table 6-2 System Base Assembly FRU Listing Base Assembly FRU Description Assembly/ Disassembly Paragraph TI Part No. 6-8 Field Service Table 6-3 Customer-Replaceable Units (CRUs) Table 6-2 System Base Assembly FRU Listing 6.5 FRU Removal/Replacement Procedures 6.5.1 Removing/Replacing the Primary Battery Pack 6.5.2 Removing/Replacing a Media Bay Device Page 6.5.3 Removing/Replacing PCMCIA Options 6.5.4 Removing/Replacing the APCI Card Option Bottom of Notebook 6.5.5 Removing/Replacing the Hard Disk Drive Assembly 6.5.6 Removing/Replacing the Keyboard Assembly 6.5.7 Removing/Replacing the Heat Sink Assembly 6.5.8 Removing/Replacing the CPU PWB Assembly 6.5.9 Removing/Replacing the Display Assembly 6.5.10 Removing/Replacing the Top Cover Assembly Page 6.5.12 Removing/Replacing the Glidepad Assembly Page 6.5.14 Removing/Replacing the Audio PWB Assembly 6.5.15 Removing/Replacing the Main PWB Assembly 6.5.16 Removing/Replacing the Battery/HDD Transfer PWB Assembly Battery/HDD Board 6.5.17 Removing/Replacing the Display FRUs