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mitac 8081


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SERVICE MANUAL FOR

                       8081




                     BY: Sissel Diao
      Repair Technology Research Department /EDVD
                        Jul. 2003
                                            8081 N/B Maintenance
Contents

1. Hardware Engineering Specification ...........................................................................                          4

  1.1 Introduction ........................................................................................................................ 4
  1.2 Hardware System .................................................................................................................. 8
  1.3 Other Functions .................................................................................................................... 28
  1.4 Peripheral Components .......................................................................................................... 34
  1.5 Power Management ............................................................................................................... 36
  1.6 Appendix 1 : Intel 82801DBM ICH4-M GPIO Definitions ............................................................... 39
  1.7 Appendix 2 : MiTAC 8081 Product Specification .......................................................................... 40

2. System View and Disassembly ....................................................................................                        41
  2.1 System View ........................................................................................................................ 41
  2.2 System Disassembly ............................................................................................................... 44

3. Definition & Location of Connectors / Switches ..............................................................                           69
  3.1 Mother Board ...................................................................................................................... 69
  3.2 DC to DC Board ................................................................................................................... 71

4. Definition & Location of Major Components .................................................................                             72
  4.1 Mother Board ...................................................................................................................... 72

5. Pin Description of Major Component ..........................................................................                           74
  5.1 Intel Banias Pentium M Processor ............................................................................................. 74

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                                             8081 N/B Maintenance
Contents

   5.2 Intel 82855GM Memory Controller Hub (GMCH) ........................................................................ 78
   5.3 Intel 82801DBM I/O Controller Hub Mobile (ICH4-M) .................................................................. 84

6. System Block Diagram .............................................................................................                        92

7. Maintenance Diagnostics ..........................................................................................                        93
   7.1 Introduction ........................................................................................................................ 93
   7.2 Error Codes ......................................................................................................................... 94
   7.3 Maintenance Diagnostics ......................................................................................................... 96

8. Trouble Shooting ...................................................................................................                      97
   8.1 No Power ............................................................................................................................ 98
   8.2 No Display ........................................................................................................................... 103
   8.3 VGA Controller Failure LCD No Display .................................................................................... 106
   8.4 External Monitor No Display ................................................................................................... 108
   8.5 Memory Test Error ............................................................................................................... 110
   8.6 Keyboard (K/B) Touch-Pad (T/P) Test Error ............................................................................... 112
   8.7 Hard Driver Test Error .......................................................................................................... 114
   8.8 CD-ROM Driver Test Error .................................................................................................... 116
   8.9 USB Port Test Error .............................................................................................................. 118
   8.10 Audio Failure ..................................................................................................................... 120
   8.11 LAN Test Error .................................................................................................................. 123
   8.12 PC Card & 1394 Socket Failure ............................................................................................. 125
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                                       8081 N/B Maintenance
Contents

9. Spare Parts List .....................................................................................................   127

10. System Exploded Views ..........................................................................................        139

11. Circuit Diagram ...................................................................................................     140

12. Reference Material ................................................................................................     171




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                                 8081 N/B Maintenance
1. Hardware Engineering Specification
 1.1 Introduction
  1.1.1 General Description
  This document describes the brief introduction for MiTAC 8081 portable notebook computer system.



  1.1.2 System Overview

  The MiTAC 8081 model is designed for Intel Banias/Dothan processor with 400MHz FSB with Micro-FCPGA
  package. It can support Banias 1.3GHz~1.7GHz CPU/Dothan CPU with 1.8GHz or above.

  This system is based on PCI architecture and is fully compatible with IBM PC/AT specification, which has standard
  hardware peripheral interface. The power management complies with Advanced Configuration and Power Interface
  (ACPI) 2.0. It also provides easy configuration through CMOS setup, which is built in system BIOS software and can
  be pop-up by pressing F2 key at system start up or warm reset. System also provides icon LEDs to display system
  status, such as AC Power indicator, Wireless on/off indicator, Battery status indicator, CD-ROM, HDD, NUM LOCK,
  CAP LOCK, SCROLL LOCK. It also equipped with LAN, 56K Fax MODEM, 4 USB port, 3D stereo audio functions,
  and audio line out, external microphone in function.

  The memory subsystem supports one expansion DDR SDRAM slot with unbuffered PC1600/PC2100 DDR-SDRAM,
  and 16Mx16 DDR RAM on board 256MB.


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                                8081 N/B Maintenance
The Montara-GM GMCH Host Memory Controller integrates a high performance host interface for Intel Banias
processor, a high performance 2D/3D Graphic Engine, a high performance memory controller, Digital Video port
(DVOB & DVOC) interface, and Intel Hub interface Technology connecting with Intel 82801DBM ICH4-M.

The Intel ICH4-M integrates three Universal Serial Bus 2.0 Host Controllers Interface (UHCI), the Audio Controller
with AC97 interface, the Ethernet includes a 32-bit PCI controller, the IDE Master/Slave controllers, and Intel Hub
interface technology.

The VIA VT6105LOM "Rhine III" Ethernet controller is a cutting edge, feature-rich, and cost-competitive single
ASIC chip solution for PC "LAN On Motherboard" applications or Low Cost NIC applications. The 6105LOM eases
server processor utilization by optimizing throughput between NIC and PCI bus allowing data transfers of up to at
200Mbps in full duplex mode, without using the system CPU. The VT6105LOM contains advanced power
management feature for low power consumption including Wake On LAN (WOL) and is implemented using a low
power 0.22-micron design.

The R5C551 is the single chip solution offering single PCI bus-PC Card Bridge. The R5C551 is compliant with the
latest specification in both PC card and IEEE 1394. The R5C551 has two PCI functions compliant, the PC Card
interface and the IEEE 1394 interface. The PC Card controller of the R5C551 is compliant with PC Card Standard
Release 7.0. The R5C551 provides features that make it the best choice for bridging between the PCI bus and PC
Cards, and supports any combination of 16-bit (Card-16), and CardBus (Card-32) PC Cards in one socket, powered at
5V or 3.3V, as required. The R5C551 provides the IEEE1394 OHCI-Link and two ports the IEEE1394 PHY that are
compliant with the IEEE1394-1995, IEEE1394a-2000 and the latest 1394 OHCI specifications. The R5C551 data rate
is capable of 100, 200, and 400Mbits per second.The R5C551 is compliant with the latest PCI Bus Power
Management Specification, and provides several low-power modes that enable the host power system to further reduce
power consumption.


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                                8081 N/B Maintenance
The NS PC87393 LPC Super I/O device is targeted for a wide range of portable applications. PC99 and ACPI
compliant, it also incorporates: a Floppy Disk Controller (FDC), two enhanced Serial Ports (UARTs), one with Fast
Infrared (FIR, IrDA 1.1 compliant), General-Purpose Input/Output (GPIO) support for a total of 32 ports, Interrupt
Serialize for Parallel IRQs and an enhanced WATCHDOG timer.

The NS PC87393 Super I/O controller integrates the standard PC I/O functions: LPC bus interface, X-Bus Extension
for read and write operations, floppy disk interface and one EPP/ECP capable parallel port. Like all LPC Super I/O
devices, the PC87393 offers a single-chip solution to the most commonly used PC I/O peripherals to provide for the
increasing number of multimedia application.

CMI9738-S is a 4CH AC97 CODEC, applicable for major MB chipsets of Intel, VIA, Ali, and SIS. CMI9738-S is
ideal for PC2001-compliant desktops, notebooks, and home entertainment PCs where high-quality audio is a must.
The specially-designed 4CH hardware architecture of CMI9738-S allows multi-channel south bridge to playback 4CH
audio. As to the cost concern, CMI9738-S integrates the earphone buffer, analog CD differential interface, and analog
switch for rear channel audio to Line-in for traditional 3 jacks audio port to output 4 channels audio. CMI9738-S also
has built-in PLL to save additional crystal. Last but not least, CMI9738-S provides HRTF 3D audio which interface
compatible with EAX/ A3D/DirectSound3D. In addition, it provides Sensaura 3D audio option. In that regard,
the audio quality of CMI9738-S is fabulous beyond general expectation.

The H8/F3437 is a high performance micro controller with a fast H8/300 CPU core and a set of on-chip supporting
functions optimized for embedded control. These include ROM, RAM, four types of timers, a serial communication
interface, optional I



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