MiTAC 8381 User manual

SERVICE MANUAL FOR
8381
SERVICE MANUAL FOR
SERVICE MANUAL FOR
8381
8381
BY: Valley. Valley.Hu Hu
RepairTechnologyResearchDepartment /EDVD
RepairTechnologyResearchDepartment /EDVD
Jul.2003

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Contents
1. Hardware Engineering Specification ----------------------------------------------------------------------------
1.1 Introduction ----------------------------------------------------------------------------------------------------------
1.2 SystemHardwareParts----------------------------------------------------------------------------------------------
1.3 OtherFunctions------------------------------------------------------------------------------------------------------
1.4PeripheralComponents----------------------------------------------------------------------------------------------
1.5 Power Management--------------------------------------------------------------------------------------------------
1.6 Appendix1: VT 8235 GPIO DEFINITIONS ------------------------------------------------------------------------
1.7 Appendix2: H8 Pins Definitions -------------------------------------------------------------------------------------
2. SystemView& Disassembly --------------------------------------------------------------------------------------
2.1 SystemView ---------------------------------------------------------------------------------------------------------
2.2 SystemDisassembly -------------------------------------------------------------------------------------------------
3. Definition & Location of Connectors / Switches Setting ----------------------------------------------------
4. Definition & Location of Major Component ------------------------------------------------------------------
5. Pin Description of Major Component ---------------------------------------------------------------------------
5.1 Mobile AthlonXP(Thoroughbred / Barton) Processor model 8 --------------------------------------------------
5.2 VIA VT8372 North Bridge with S3 ProSavage8 AGP8X-----------------------------------------------------------
5.3 VIA VT8235 PCI-LPC South Bridge -------------------------------------------------------------------------------
6. SystemBlock Diagram---------------------------------------------------------------------------------------------
7. Maintenance Diagnostics ------------------------------------------------------------------------------------------
7.1 Introduction ----------------------------------------------------------------------------------------------------------
7.2 ErrorCodes ----------------------------------------------------------------------------------------------------------
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8. Trouble Shooting --------------------------------------------------------------------------------------------------
8.1 No Power -----------------------------------------------------------------------------------------------------------
8.2 Battery Can t Be Charged -----------------------------------------------------------------------------------------
8.3 No Display ----------------------------------------------------------------------------------------------------------
8.4 LCD No Display or Picture Abnormal----------------------------------------------------------------------------
8.5 External Monitor No Display or Color Abnormal----------------------------------------------------------------
8.6 Memory Test Error ------------------------------------------------------------------------------------------------
8.7 Keyboard and Touch-Pad Test Error-----------------------------------------------------------------------------
8.8 Hard DriveTest Error --------------------------------------------------------------------------------------------
8.9 CD-ROM DriveTest Error----------------------------------------------------------------------------------------
8.10 USB Port Test Error ---------------------------------------------------------------------------------------------
8.11 PC-Card Socket Fail ---------------------------------------------------------------------------------------------
8.12 LAN Test Error --------------------------------------------------------------------------------------------------
8.13 Audio Failure -----------------------------------------------------------------------------------------------------
8.14 Mini PCI Test Error ---------------------------------------------------------------------------------------------
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9. Spare Parts List ----------------------------------------------------------------------------------------------------
10. SystemExploded Views -----------------------------------------------------------------------------------------
11. Circuit Diagram---------------------------------------------------------------------------------------------------
12. Reference Material-----------------------------------------------------------------------------------------------
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Contents
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1. HardwareEngineering Specification
1.1Introduction
The 8381 motherboard would support the AMD35WMobile Thoroughbred /Barton CPU with OPGA, 462 Socket,
which will support different speeds up to 2200+ forThoroughbred35W(L2 cache 256K) and to 2500+ for Barton
35W(L2 cache 512K).
This system is based on PCIarchitecture,which have standard hardware peripheral interface. The power
management complieswith Advanced Configuration and Power Interface (ACPI)2.0. Italso provides easy
configuration through CMOS setup, which is built in system BIOS software and can be pop-up bypressing F2 at
system start up or warm reset. System also provides icon LEDsto displaysystem status, such as Power indicator,
HDD,CDROM, NUM LOCK, CAP LOCK, SCROLL LOCK,WIRELESS LAN and Batterycharging status. It also
equipped 4USB ports.The memorysubsystem supports 256MB on board DDR memory,One JEDEC-standard 200-
pin, small-outline, dual in-line memory module (SODIMM) ,support PC2100.
Integrated VIA Apollo KN266 and S3 Graphics, ProSavage8 128-bit 2D/3D graphics controller with equivalent 8x
AGP performance in a single chip, 64-bit Advanced Memorycontroller supporting PC2100/PC1600 DDR SDRAM.
Combines with VIA VT8235 Vlink-LPC South Bridge with integrated audio, 4USB ports, ATA100 IDE and LAN
Mac.
To provide for the increasing number of multimedia applications,the AC97 CODEC CMI9738S is integrated onto
the motherboard.
Afull set of software drivers and utilities are available to allow advanced operating systems such as Windows 2000
and Windows XP Home/Professional Edition to take full advantage of the hardware capabilities such as bus

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mastering IDE, Windows 95-readyPlug &Play,Advanced Power Management (APM) and Advance configuration
and power interface (ACPI).
Following chapters will have more detail description for each individual sub-systems and functions.

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1.2SystemHardware Parts
Item System A System B
CPU AMD 35WAthlon XPCPUAMD 35W Athlon XPCPU
Corelogic VIAKN266 (VT8372 +VT8235) VIAKN266 (VT8372 +VT8235)
Memory onBoard DDRRAM:SamsungK4H561638D-TCB0DDRRAM: SamsungK4H561638D-TCB0
ACAdapter Delta:60W FSP:90WFSP090-1ADC21
IDEExternal DVD-ROM Driver 8X DVD MKE: SR-8177(8X)
IDEInternal Combo Drive 24*10*8*24 Combo(QSI:SBW-242)
USBExternalFDD driver W/O Mitsumi ext. FDD W/O Mitsumi ext. FDD
HDD Fujitsu 20GBMHT2020ATFujitsu 40GBMHT2040T
TFTLCD Display 14.1 XGAQDIQD141*1LH12 14.1 XGA(CMO:N141X6-L01)
Video Controller S3 ProSavage8S3 ProSavage8
Pointing Device SynapticsTM41PDM-311SynapticsTM41PDM-311
FIR/ SIR NoneNone
PCMCIA TI PCI1510 TI PCI1510
Audio CMI9783 CMI9783
I/O NoneNone
KeyboardController Hitachi H8/2140BHitachi H8/2140B
Fax Modem Askey V1456VQL-P1(INT)Askey1456VQL4A(INT)
Battery MSL6 cells 2000mAH(Panasoniccell) MSL6 cells 2000mAH(sanyo cell)

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1.2.1 The AMD AthlonXP processor model 8
The AMD AthlonXP processor model 8is the latest member of the AMD Athlonfamily of processors designed to
meet the computation-intensive requirements of cutting-edge software applications running on high-performance
desktop systems. Delivered in an OPGA package, the AMD AthlonXP processor model 8deliversthe integer,
floating-point, and 3D multimedia performance for highlydemanding applications running on x86 system platforms.
The AMD AthlonXP processor model 8 delivers compelling performance for cutting-edge software applications that
include high-speed Internet capability, digital content creation, digital photo editing, digital video, image
compression, video encoding for streaming over the Internet, soft DVD, commercial 3D modeling, workstation-class
Computer-Aided Design (CAD), commercial desktop publishing, and speech recognition. The AMD AthlonXP
processor model 8 also offers the scalabilityand reliabilitythat ITmanagers and businessusersrequire for enterprise
computing.
The AMD AthlonXP processor model 8features aseventh-generation micro architecturewith an integrated,
exclusive L2 cache, which supports the growing processor and system bandwidth requirements of emerging software,
graphics, I/O, and memory technologies. The high-speed execution coreof the AMD AthlonXP processor model 8
includes multiple x86 instruction decoders, adual-ported 128-Kbytesplit level-one (L1) cache, an exclusive 256-
KbyteL2 cache, three independent integer pipelines, three addresscalculation pipelines, and asuper scalar, fully
pipelined, out-of-order,three-way floating-point engine. The floating-point engine is capable of delivering
outstanding performance on numerically complex applications.
The features of the AMD AthlonXP processor model 8 are Quaint Speed architecture, a high-performance full-speed
cache, a266-MHz, 2.1-Gigabyte per second systembus, and 3DNow! Professional technology.The AMD Athlon
system bus combines the latest technological advances, such as point-to-point topology,source-synchronous packet-
based transfers, and low-voltage signaling to provide an extremely powerful, scalable busfor an x86 processor.

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The AMD AthlonXP processor model 8is binary-compatible with existing x86 software and backwards compatible
with applications optimized for MMX, SSE, and 3DNow! technology.Using adata format and Single-Instruction
Multiple-Data (SIMD) operations based on the MMX instruction model, the AMD AthlonXP processor model 8
can produce as many as four, 32-bit, single-precision floating-point results per clock cycle. The 3DNow!
Professional technology implemented in the AMD AthlonXP processor model 8includes new integer multimedia
instructions and software-directed data movement instructions for optimizing such applications as digital content
creation and streaming video for the internet, as well as new instructions for Digital Signal Processing (DSP) and
communications applications.
The following featuressummarize the AMD AthlonXP processor model 8QuantiSpeedarchitecture:
An advanced nine-issue, super pipelined, super scalar x86 processor micro architecture designed for increased
Instructions Per Cycle (IPC) and high clock frequencies
Hardware data pre-fetch that increases and optimizes performance on high-end software applications utilizing
high-bandwidth system capabilities
Fully pipelined floating-point unit that executes all x87(floating-point), MMX, SSE and 3DNow! Instructions
Advanced two-level Translation Look-aside Buffer (TLB) structures for both enhanced data and instruction
address translation.
The AMD AthlonXP processor model 8with QuantiSpeedarchitecture incorporates three TLB optimizations: the
L1 DTLB increases from 32 to 40 entries, the L2 ITLB and L2 DTLBboth use exclusive architecture, and the TLB
entries can be speculativelyloaded.
The AMD AthlonXP processor model 8 delivers excellent system performance in acost-effective, industry-standard
form factor. The AMD AthlonXP processor model 8 is compatible with motherboards based on Socket A.

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1.2.2 System frequency
System frequencysynthesizer ICS950902 pinconfiguration is suitable for VIA KN266 chipsetwith PC133 or DDR
memory.
OutputFeatures:
1 -Pair of differential CPU clocks @ 3.3V (CK408)/ 1 -Pair of differential open drain CPU clocks (K7)
1 -Pair of differential push pull CPU_PP clocks @ 2.5V
3 -AGP @3.3V
7 -PCI @ 3.3V
1 -48MHz @ 3.3V fixed
1 -24_48MHz @ 3.3V
2 -REF @3.3V, 14.318MHz
Features/Benefits:
Programmable output frequency.
Programmable output divider ratios.
Programmable output rise/fall time.

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Programmable output skew.
Programmable spread percentage for EMI control.
Watchdog timer technologyto reset system if system malfunctions.
Programmable watch dog safe frequency.
Support I 2 C Index read/write and block read/write operations.
Uses external 14.318MHz crystal.
KeySpecifications:
CPU_CS -CPUT/C: <250ps
CPU_CS -AGP: <250ps
CPU -DDR/SD: <250ps
PCI -PCI: <500ps