The information presented in this manual has been reviewed and validated for accuracy. The included set of
instructions and descriptions are accurate for the QOSMIO G20 at the time of this manual's production.
However, succeeding computers and manuals are subject to change without notice. Therefore, Toshiba assumes
no liability for damages incurred directly or indirectly from errors, omissions, or discrepancies between any
succeeding product and this manual.
Trademarks
IBM is a registered trademark and IBM PC is a trademark of International Business Machines Corporation.
Intel, Intel SpeedStep, Centrino, Pentium are trademarks or registered trademarks of Intel Corporation or its
subsidiaries in the United States and other countries/regions.
Windows and Microsoft are either registered trademarks of Microsoft Corporation.
Bluetooth is a trademark owned by its proprietor and used by TOSHIBA under license.
Memory Stick id a registered trademark and i.LINK is a trademark of Sony Corporation.
Other trademarks and registered trademarks not listed above may be used in this manual.
ii [CONFIDENTIAL] QOSMIO G20 Maintenance Manual (960-511)
Preface
This maintenance manual describes how to perform hardware service maintenance for the
Toshiba Personal Computer QOSMIO G20.
NOTE: Each model of QOSMIO G20 has a different configuration. For each model’s
configuration, refer to the parts list dedicated to it.
The procedures described in this manual are intended to help service technicians isolate
faulty Field Replaceable Units (FRUs) and replace them in the field.
SAFETY PRECAUTIONS
Four types of messages are used in this manual to bring important information to your
attention. Each of these messages will be italicized and identified as shown below.
DANGER: “Danger” indicates the existence of a hazard that could result in death or
serious bodily injury, if the safety instruction is not observed.
WARNING: “Warning” indicates the existence of a hazard that could result in bodily
injury, if the safety instruction is not observed.
CAUTION: “Caution” indicates the existence of a hazard that could result in property
damage, if the safety instruction is not observed.
NOTE: “Note” contains general information that relates to your safe maintenance
service.
Improper repair of the computer may result in safety hazards. Toshiba requires service
technicians and authorized dealers or service providers to ensure the following safety
precautions are adhered to strictly.
Be sure to fasten screws securely with the right screwdriver. Be sure to use the PH
Point size “0” and “1” screwdrivers complying with the ISO/DIS 8764-1:1996. If a
screw is not fully fastened, it could come loose, creating a danger of a short circuit,
which could cause overheating, smoke or fire.
If you replace the battery pack or RTC battery, be sure to use only the same model
battery or an equivalent battery recommended by Toshiba. Installation of the wrong
battery can cause the battery to explode.
QOSMIO G20 Maintenance Manual (960-511) [CONFIDENTIAL] iii
The manual is divided into the following parts:
Chapter 1 Hardware Overview describes the QOSMIO G20 system unit and each
FRU.
Chapter 2 Troubleshooting Procedures explains how to diagnose and resolve
FRU problems.
Chapter 3 Test and Diagnostics describes how to perform test and diagnostic
operations for maintenance service.
Chapter 4 Replacement Procedures describes the removal and replacement of the
iv [CONFIDENTIAL] QOSMIO G20 Maintenance Manual (960-511)
Conventions
This manual uses the following formats to describe, identify, and highlight terms and
operating procedures.
Acronyms
On the first appearance and whenever necessary for clarification acronyms are enclosed in
parentheses following their definition. For example:
Read Only Memory (ROM)
Keys
Keys are used in the text to describe many operations. The key top symbol as it appears on
the keyboard is printed in boldface type.
Key operation
Some operations require you to simultaneously use two or more keys. We identify such
operations by the key top symbols separated by a plus (+) sign. For example, Ctrl + Pause (Break) means you must hold down Ctrl and at the same time press Pause (Break). If
three keys are used, hold down the first two and at the same time press the third.
User input
Text that you are instructed to type in is shown in the boldface type below:
DISKCOPY A: B:
The display
Text generated by the QOSMIO G20 that appear on its display is presented in the type face
below:
Format complete
System transferred
QOSMIO G20 Maintenance Manual (960-511) [CONFIDENTIAL] v
Table of Contents
Chapter 1 Hardware Overview
1.1 Features ...................................................................................................................... 1-1
1.2 System Block Diagram .............................................................................................. 1-5
1.3 2.5-inch Hard Disk Drive......................................................................................... 1-10
The QOSMIO G20 series are high performance all-in-one PCs running a Pentium-M
processor.
The features are listed below.
❑ Microprocessor
Microprocessor that is used will be different of the model.
®
Intel
Mobile Pentium ®-M
Pentium-M 1.60GHz (Processor Number : 730)
1.73GHz (Processor Number : 740)
1.86GHz (Processor Number : 750)
2.00GHz (Processor Number : 760)
2.13GHz (Processor Number : 770)
L1 cache : 64KB (32KB + 32KB)
L2 cache : 2MB
❑ Memory
Two DDR2-SDRAM slots. Memory modules can be installed to provide a maximum
of 2GB. Memory modules are available in 256MB, 512MB and 1024MB sizes.
❑ VGA
nVIDIA NV43M is mounted.
❑ HDD
Double (or single) 60GB 80GB or 100GB internal serial-ATA drive. 2.5 inch x
9.5mm height.
❑ Optical devices
A slot-loading style DVD Super Multi drive (supporting double layer) is equipped.
❑ Keyboard
An-easy-to-use 85(US)/86(UK)-key keyboard provides a numeric keypad overlay for
fast numeric data entry or for cursor and page control. The keyboard also includes
two keys that have special functions in Microsoft Windows XP. It supports
software that uses a 101- or 102-key enhanced keyboard.
Built-in 17.0-inch, WXGA+ (1,440 x 900 dots) amorphous silicon TFT color
display.
Interface
To external monitor via - RGB connector
- S-video OUT connector
- D-port OUT connector
To internal monitor via - S-video IN connector
- Monitor IN port
❑ Sound system
Harman/Kardon-made stereo speaker is equipped. An internal microphone, external
monaural microphone connector, stereo headphone connector is also equipped.
❑ Battery
The RTC battery is equipped inside the computer.
The main battery is a detachable lithium ion battery (4,400mAh:Li-Ion, 6cell).
❑ TV-tuner (Mini PCI slot)
This enables to watch TV and record it. (Supporting world wide signal : NTSC, PAL
and SECAM).
❑ Wireless LAN (Mini PCI slot)
The wireless LAN is equipped on the mini PCI slot.
❑ LAN/MODEM
Connectors for LAN and Modem are separately mounted.
❑ Bluetooth
Depending on the model, the computer is equipped with a dedicated Bluetooth
module. This enables a communication to devices that support Bluetooth
Version 1.2/1.1/. Adopting AFH (Adaptive Frequency Hopping), reduce the
interference with the wireless communication in 2.4GHz. It can be switched on or off
with a switch on the computer.
A remote controller for easy operation from some distance.
❑ USB FDD
USB FDD supports 720KB and 1.44MB.
❑ PC card slot
The PC card slot (PCMCIA) accommodates one 5mm Type II card. (Based on PC
Card Standard, supporting CardBus)
❑ ExpressCard slot
The ExpressCard slot accommodates an ExpressCard.
❑ USB (Universal Serial Bus)
Four USB ports are provided. The ports comply with the USB2.0 standard, which
enables data transfer speeds 40 times faster than USB1.1 standard. USB1.1 is also
supported.
❑ Bridge Media slot
One SD memory card/ SDIO card/Memory stick (PRO)/xDPicture card/MultiMedia
card slot. Data can be read and written by inserting each media to the slot.
❑ IEEE1394 port
The computer has one IEEE 1394 port. It enables high-speed data transfer directly
from external devices such as digital video cameras.
❑ S/PDIF
This port can send or receive the digital sound data with the equipment like CD, MD
Player. (This port is also used for headphone I/F.)
Two memory slots capable of accepting DDR2-SDRAM 256MB, 512MB or 1024MB
memory modules for a maximum of 2GB.
- 200-pin small-size DIMM
- 2.5V operation
- PC3200(DDR2-400)/PC4300(DDR2-533) support
❑ BIOS ROM (Flash memory)
- 8Mbit (512K×16-bit chip)
64KB used for logo/icon
224KB used for system BIOS
64KB used for VGA-BIOS
60KB used for Intel PXE
32KB used for ACPI
16KB used for MBI
17KB used for booting
16KB used for Parameter Block
19KB are reserved
2.4GHz DSSS/OFDM, 5.0GHz OFDM wireless LAN card is equipped.
Conformity with IEEE 802.11b/g or IEEE 802a/b/g. Transfer speed is maximum
of 11Mbit/sec. Supports 128bit WEP.
TV tuner
Some signals (NTSC, PAL and SECAM) are supported for worldwide use and
MPEG2 hardware encoding function are also supported.
LAN controller (ICH4-M Kinnerth 82562EP)
Controls LAN and supports 100BASE-TX (Fast Ethernet)/10BASE-T (Ethernet).
Other main system chips
¾ PSC (Toshiba-made TMP87PM48U x 1)
¾ Clock Generator (ICS-made 954204BGFT x 1)
¾ EC/KBC (Renesas-made M306KA x 1)
¾ FWH (ST-Micro-made M50FW080N1 x 1)
¾ AC97-CODEC (ADI-made AD1981 x 1)
¾ Audio AMP (Matsushita-made AN12941A-VF x1)
¾ SVP EX (Trident-made 7052-LF x 1)
Supported by MDC.
Uses secondary AC97 line.
Data and FAX transmission is available.
Supports ITU-TV.90.
The transfer speed of data receiving is 56kbps, of data sending is 33.6kbps and of
FAX is 14.4kbps. Actual speed depends on the quality of the line used.
Connected to telephone line through RJ11 MODEM jack.
1.4.1 DVD Super Multi Drive (supporting Double-Layer)
The DVD Super Multi drive (supporting Double Layer) accommodates 12 cm (4.72-inch)
CD/DVD-ROM, CD-R/RW, DVD±R/±RW and DVD-RAM. It is a high-performance drive
that reads DVD-ROM at maximum 8-speed and CD-ROM at maximum 24-speed. It writes
CD-R at maximum 24-speed, CD-RW at maximum 10-speed, DVD±R at maximum 8-speed,
DVD±RW at maximum 4-speed, DVD-RAM at maximum 5-speed and DVD+R (Double
Layer) at maximum 2.4-speeed.
The DVD Super Multi drive is shown in Figure 1-6. The dimensions and specifications of the
DVD Super Multi drive are described in Table 1-7, Table 1-8.
Table 1-3 DVD Super Multi drive (Double-Layer) outline dimensions
A keyboard which consists of 85(US)/86(UK) keys is mounted on the system unit. The
keyboard is connected to membrane connector on the system board and controlled by the
keyboard controller.
Figure 1-7 is a view of the keyboard.
Figure 1-5 Keyboard
See Appendix E for details of the keyboard layout.
The TFT color display is 17.1 inch and consists of LCD module and FL inverter board.
1.6.1 LCD Module
The LCD module used for the TFT color display uses a backlight as the light source and can
display a maximum of 320,000 colors with 1,440 x 900 resolution.
Figure 1-8 shows a view of the LCD module and Table 1-9 lists the specifications.
Figure 1-6 LCD module
Table 1-5 LCD module specifications
Specifications
Item
Number of Dots
Dot spacing (mm) 0.255 (H) x 0.255 (V)
Display range (mm) 367.2 (W) x 229.5 (H)
Outline dimensions 382.2 (w) x 246.8 (H) x 10.0(max) (D)