Texas Instruments 51X 4.2.3

•Integral address decoder - provides selection of all primary and

secondary ISA addresses including COM1-4 and LPT1-3.

•Enhanced Power Management Fun ction

•Special configuration registers for power down

•Enhanced programmable power-down and wake-up modes

•Auto power-down and wake-up modes

•3 special pins for power management

•Typical current consumption during power-down is less than 10A

4.2.3 Video Subsystem

The video subsystem, implemented on the Main Board and on the LCD

Display Unit, displays text, graphics and drives an external VGA port. The

video subsystem is implemented with a Chips and Technology hig h

performance flat panel/RT VGA controller and supporting logic and video

RAM (1 MB).

The major features of the VGA controller include:

•Highly integrated design (flat panel / CRT VGA controller, RAMDAC,

clock synthesizer)

•Multiple Bus Architecture Integrated Interface

• Local Bus (32-bit CPU Direct and VL)

• PCI Bus

• EISA/ISA (PC/AT) 16-bit Bus

•Advanced frame buffer architecture uses available display memory,

maximizing integration and minimizing chip count

•Integrated programmable linear address feature accelerates GUI

performance

•High performance resulting from zero wait state writes (write buffer) and

minimum wait state reads (internal asynchronous FIFO design)

•Supports panel resolutions up to 800 x 600

•SMARTMAP intelligent color to gray scale conversion enhances text

legibility

•Text enhancement feature improves white text contrast on flat panel

displays

•Fully Compatible with IBM VGA

4-4 Theory of Operation

Contents

Main Page Contents Preface 1 General Description 2 Installation 3 Operating Instructions 4 Theory of Operation 5 Troubleshooting Procedures 6 Field Service ASelf Test Error Messages BPC-Doctor Diagnostics Preface Introduction Intended Audience Contents Other Manuals About the System Ordering Parts and Supplies 1 General Description 1.1 1.2 Model 510 Model 515 1.3 Configuration P/N Suffix Configuration P/N Suffix 1.4 Page Figure 1-2 Extensa 51x Series Features 1-4 General Description 1.4.1 1.4.2 1.4.3 n 1.4.3.1 Controls and Indicators ^ 1.4.4 1.4.5 Status LEDs 1.4.6 1.5 1.6 Subassemblies 1.6.1 1.6.2 1.7 Specifications Table 1-3 Extensa 51x Notebook Features Specifications Model 510 Model 515 General Description 1-13 * Weight specifications do not include AC Adapter 1.8 2 Installation 2.1 2.2 n 2.3 c n 2.3.1 Page 2.3.2 2.3.3 2.4 c 2.5 2.5.1 2.5.2 2.5.3 c 2.5.4 2.5.5 2.5.6 2.5.7 2.6 c 2.7 2.8 2.9 2.10 3 Operating Instructions n 3.1 3.2 3.2.1 3.2.2 Status LEDs 3.2.3 3.2.4 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 n 4 Theory of Operation 4.1 4.2 4.2.1 MAIN BOARD Figure 4-1 Notebook Functional Block Diagram 4-2 Theory of Operation 4.2.2 4.2.3 4.2.3.1 External VGA Drive Capability c 4.2.4 c 4.2.5 4.2.6 4.2.7 Page Table 4-4 Primary Battery Pack Specifications Function Specifications 4-8 Theory of Operation 5 Troubleshooting Procedures 5.1 5.2 SEE PARAGRAPH 5.3.3 Figure 5-1 Troubleshooting Flowchart 5-2 Troubleshooting 5.3 5.3.1 (EG. a lamp) to verify that voltage is present. If the voltage is OK, try replacing the AC Adapter 5-4 Troubleshooting MAIN BOARD n 5.3.3 5.3.4 5.3.5 5.3.5.1 Interactive Tests Page 5.3.5.3 Creating a Bootable Floppy Diskette n 5.3.5.4 Running PC-Doctor Page 6 Field Service c 6.1 6.2 6.2.1 c 6.2.2 6.2.3 6.2.4 6.3 c 6.4 and Assemblies 6.4.1 Page 6.4.2 Table 6-2 Base Assembly, Field-Replaceable Units (FRUs) FRU Description Page CRU Description c 6.5 c Replacement Procedures 6.5.1 Pack 6.5.2 n c 6.5.3 6.5.4 6.5.5 Assembly 6.5.6 Hard Drive Cover HDD Release Latches 6.5.7 6.5.8 6.5.9 or Contrast Board c 6.5.10 6.5.11 Control Board 6.5.12 Supply Board Assembly 6.5.13 6.5.14 Page A Self Test Error Messages A.1 Error Messages A-1 Error Message Corrective Action Table A-2 POST Checkpoint List A-2 Error Messages Error Messages A-3 A-4 Error Messages Page B PC-Doctor Diagnostics B.1 B.2 B.3 B.4 B.4.1 B.4.2 n B.4.3 B.4.4 B.4.5 B.5 B.6