Acer G195HQ User manual

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Acer G195HQ
Service Guide

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Service Guide Version and Revision
Version Release Date Revision History Customer model TPV model
A00 Sep-10-2009 Initial Release G195HQ T89AM6D8MXAFH2
T89AM5D8MXAFN2

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Copyright
Copyright © 2009 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced,
Transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in
any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without
the prior written permission ofAcer Incorporated.
Disclaimer
The information in this guide is subject to change without notice. Acer Incorporated makes no representations or
warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties
of merchantability or fitness for any particular purpose. Any Acer Incorporated software described in this manual is
sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not Acer
Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any
incidental or consequential damages resulting from any defect in the software.
Intel is a registered trademark of Intel Corporation.
Pentium and Pentium II/III are trademarks of Intel Corporation.
Other brand and product names are trademarks and/or registered trademarks of their respective holders.
Trademarks
Acer is a registered trademark of Acer Incorporated.
All other trademarks are property of their respective owners.
Conventions
The following conventions are used in this manual:
Screen messages Denotes actual messages that appear on screen.
Note Gives bits and pieces of additional information related to the current topic.
Warning Alerts you to any damage that might result from doing or not doing specific actions.
Caution Gives precautionary measures to avoid possible hardware or software problems.
Important Remind you to do specific actions relevant to the accomplishment of procedures.

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Preface
Before using this information and the product it supports, please read the following general information.
1. This Service Guide provides you with all technical information relating to the BASIC CONFIGURATION decided
for Acer's "global" product offering. To better fit local market requirements and enhance product competitiveness,
your regional office may have decided to extend the functionality of a machine (e.g. add-on card, modem, or extra
memory capability). These LOCALIZED FEATURES will NOT be covered in this generic service guide. In such
cases, please contact your regional offices or the responsible personnel/channel to provide you with further
technical details.
2. Please note WHEN ORDERING FRU PARTS, that you should check the most up-to-date information available on
your regional web or channel. If, for whatever reason, a part number change is made, it will not be noted in the
printed Service Guide. For ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may have a
DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You MUST use the list
provided by your regional Acer office to order FRU parts for repair and service of customer machines.
Warning: (For FCC Certified Models)
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency energy, and if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experienced radio/TV technician for help.
Notice:
1. The changes or modifications not expressly approved by the party responsible for compliance could void the
user's authority to operate the equipment.
2. Shielded interface cables andAC power cord, if any, must be used in order to comply with the emission limits.
3. The manufacturer is not responsible for any radio or TV interference caused by unauthorized modification to this
equipment. It is the responsibility of the user to correct such interference.
As ENERGY STAR®Partner our company has determined that this product meets the ENERGY STAR®
guidelines for energy efficiency.
Warning:
To prevent fire or shock hazard, do not expose the monitor to rain or moisture. Dangerous high voltages are present
inside the monitor. Do not open the cabinet. Refer servicing to qualified personnel only.

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Precautions
zDo not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in
a wet basement.
zDo not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can injure a person and
cause serious damage to the appliance. Use only a trolley or stand recommended by the manufacturer or sold
with the monitor. If you mount the monitor on a wall or shelf, uses a mounting kit approved by the manufacturer
and follow the kit instructions.
zSlots and openings in the back and bottom of the cabinet are provided for ventilation. To ensure reliable
operation of the monitor and to protect it from overheating, be sure these openings are not blocked or covered.
Do not place the monitor on a bed, sofa, rug, or similar surface. Do not place the monitor near or over a radiator
or heat register. Do not place the monitor in a bookcase or cabinet unless proper ventilation is provided.
zThe monitor should be operated only from the type of power source indicated on the label. If you are not sure of
the type of power supplied to your home, consult your dealer or local power company.
zThe monitor is equipped with a three-pronged grounded plug, a plug with a third (grounding) pin. This plug will fit
only into a grounded power outlet as a safety feature. If your outlet does not accommodate the three-wire plug,
have an electrician install the correct outlet, or use an adapter to ground the appliance safely. Do not defeat the
safety purpose of the grounded plug.
zUnplug the unit during a lightning storm or when it will not be used for long periods of time. This will protect the
monitor from damage due to power surges.
zDo not overload power strips and extension cords. Overloading can result in fire or electric shock.
zNever push any object into the slot on the monitor cabinet. It could short circuit parts causing a fire or electric
shock. Never spill liquids on the monitor.
zDo not attempt to service the monitor yourself; opening or removing covers can expose you to dangerous
voltages and other hazards. Please refer all servicing to qualified service personnel
zTo ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate
configured receptacles marked between 100 - 240V AC, Min. 5A.
zThe wall socket shall be installed near the equipment and shall be easily accessible.
Special Notes on LCD Monitors
The following symptoms are normal with LCD monitor and do not indicate a problem.
Notes
zDue to the nature of the fluorescent light, the screen may flicker during initial use. Turn off the Power Switch and
then turn it on again to make sure the flicker disappears.
zYou may find slightly uneven brightness on the screen depending on the desktop pattern you use.
zThe LCD screen has effective pixels of 99.99% or more. It may include blemishes of 0.01% or less such as a
missing pixel or a pixel lit all of the time.
zDue to the nature of the LCD screen, an afterimage of the previous screen may remain after switching the image,
when the same image is displayed for hours. In this case, the screen is recovered slowly by changing the image
or turning off the Power Switch for hours.

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Table of Contents
Chapter 1 Monitor Features ………………………………………… 7
Introduction ……………………………………… 7
Electrical Requirements ……………………………………… 8
LCD Monitor General Specification ……………………………………… 9
LCD Panel Specification ……………………………………… 11
Factory Preset Timing ……………………………………… 13
Monitor Block Diagram ……………………………………… 14
Main Board Diagram ……………………………………… 15
Power Board Diagram 16
Software Flow chart ……………………………………… 17
Main Board Layout ……………………………………… 19
Installation ……………………………………… 20
Chapter 2 Operating Instructions ……………………………………… 22
User Controls ……………………………………… 22
Front Panel Controls ……………………………………… 22
eColor Management (OSD) ……………………………………… 23
How to Adjust a Setting ……………………………………… 23
How to Optimize The DOS-Mode ……………………………………… 26
Enter into the factory mode ……………………………………… 26
Chapter 3 Machine Disassembly ……………………………………… 27
Chapter 4 Troubleshooting ……………………………………… 33
Chapter 5 Connector Information ……………………………………… 39
Chapter 6 FRU (Field Replacement Unit) List ……………………………………… 40
Exploded Diagram ……………………………………… 40
Chapter 7 Schematic Diagram ……………………………………… 45

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Monitor Features
Introduction
Scope
This short specification describes the electrical, optical and functional performance requirements for a 47cm (18.5”)
TFT LCD color monitor with VGA&DVI compatible interface.
Description
The LCD monitor is designed with the latest LCD technology to provide a performance oriented product with no
radiation. This will alleviate the growing health concerns. It is also a space saving design, allowing more desktop
space, and comparing to the traditional CRT monitor, it consumes less power and gets less weight in addition MTBF
target is 50k hours or more.
Chart of G195HQ
Panel M185XW01
Signal Interface D-Sub 15pin;
DVI 24pin(Dual-Input Model);
Sync Type Separate / Compatible
Color Temp User Adjust Support
DDC DDC2B
Speaker Option
Headphone Jack Option
Microphone Jack No
USB Hub No
Tilt / Swivel Yes /No
Chapter 1

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Electrical Requirements of G195HQ
Standard Test Conditions
All tests shall be performed under the following conditions, unless otherwise specified.
Warm up time ＞30 min.
AC supply voltage 220V± 5％, 50± 3 Hz
Ambient temperature 20°C ±5°C
Humidity 50% ±10%
Display mode 1366 x 768, 60 Hz, all white
e-color mode Set to “User” mode
Contrast control Set to The value under user mode, which allows that the brightest
two of 32 linear distributed gray-scales (0～700mv) can be
distinguished.
Color temperature 6500°K
Brightness control The value under user mode
Analog Input signal 700 mVss
Picture position and size Factory preset value,
Viewing angle 90 ° H and V
Viewing distance 40 cm for LCD performance, 20 cm for LCD failures
Ambient illumination Dark room < 1 cd/m2
Measurement systems
The units of measure stated in this document are listed below:
1 gamma = 1 nano tesla
1 tesla = 10,000 gauss
cm = in x 2.54
Lb = kg x 2.2
Degrees F = [°C x 1.8] + 32
Degrees C = [°F - 32]/1.8
u' = 4x/(-2x + 12y + 3)
v' = 9y/(-2x + 12y + 3)
x = (27u'/4)/[(9u'/2) - 12v' + 9]
y = (3v')/[(9u'/2) - 12v' + 9]
nits = cd/(m2) = Ft-L x 3.426
lux = foot-candle x 10.76

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LCD Monitor General Specification
LCD Panel
Driving system TFT Color LCD
Pixel pitch 0.3(H) x 0.3(V)
Contrast Ratio 1000 : 1 (typ)
Response time 5ms(Typ.). 8ms(max)
Luminance of White 250 cd/m2(Typ.)
Input
Separate Sync. H/V TTL
H-Frequency 30kHz – 80kHz
V-Frequency 55-75Hz
Viewing angle H:170°/ V:160° ( type)(CR>10)
Display Colors 16.7M
Weight(with stand) 3.7KG
Weight(without stand) 3.36KG
Dimension(with stand) 452.59(H)x 348.90(V) x 173.80(D) (mm)
Dimension(without stand) 452.59(H)x 288.95(V) x 60.00(D) (mm)
Display mode 1366 x 768 @60Hz
EPA ENERGY STAR® ON Mode < 37W
OFF Mode < 1W
Contrast control Set to The value under user mode, which allows that the brightest two of 32 linear
distributed gray-scales (0～700mv) can be distinguished.
Power Source 100 V ~ 240 V，50 ±3Hz, 60 ±3Hz
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp: -20° to 60°C
Operating Humidity: 15% to 90%
Storage Humidity: 15% to 90%
Operating Altitude: 12,000 feet
Storage Altitude: 40,000 feet
Peak surge current < 55A peak at 240 VAC and cold starting
Power line surge No advance effects (no loss of information or defect)

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348.90 mm
288.95 mm
452.59 mm 60.00 mm
173.80 mm
261.18 mm
G195HQ

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LCD Panel Specification of G195HQ
This specification applies to the 18.5 inch-wide Color a-Si TFT-LCD Module M185XW01.The display supports the
WXGA - 1366(H) x 768(V) screen format and 16.7M colors (RGB 6-bits +Hi-FRC data). All input signals are
1-channel LVDS interface and this module doesn’t contain an inverter board for backlight.
General Specifications
Block Diagram
TFT LCD Module

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Optical Specifications

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Factory Preset Timing of G195HQ

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Monitor Block Diagram
The LCD MONITOR will contain a main board, a power board, and a key board which house the flat panel control
logic, brightness control logic and DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips
each voltage.
Power Board
Flat Panel and
CCFL backlight
Main Board
Key board D-SUB Signal
CCFL Drive.
AC-IN
100V-240V DVI Signal
(Dual-Input model)

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Main Board Diagram
T89AM6D8MXAFH2 (Dual-Input Model)
T89AM5D8MXAFN2
Flash Memory
EN25F20
(U402)
Panel Interface
(CN301)
Crystal 14.31818MHZ
(X401)
Key control Interface
(CN402)
Scalar IC TSUMU5PEHL-LF
(Include MCU, ADC, OSD)
(U401)
D-Sub
Connector
(CN101)
H sync
V sync
RGB
DVI
Connector
(
CN102
)
D-Data
D-Clock
Flash Memory
EN25F20
(U402)
Panel Interface
(CN301)
Crystal 14.31818MHZ
(X401)
Key control Interface
(CN402)
Scalar IC TSUM1PEL
(Include MCU, ADC, OSD)
(U401)
D-Sub
Connector
(CN101)
H sync
V sync
RGB

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Power Board Diagram
DIM
EMI filter
Start Resistor
(R908)
PWM Control
(U901)
Transformer
AC input 14.5V
ON/OFF
Feedback
Circui
t
Transformer
(T801) MOSFET
(Q803)
Lamp
5V
Bridge
Rectifier
and Filter
Feedback
Circuit
Rectifier
diodes
Output
Circui
t
PWM Control
AM9000ES
(U801)
Power Switch
(Q901)
Photo coupler
(U902)
5V
14.5V

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Software Flow Chart
N
Y
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
15
Y
N16
17
19
Y
N
18

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Remark:
1) MCU initializes.
2) Is the EEPROM blank?
3) Program the EEPROM by default values.
4) Get the PWM value of brightness from EEPROM.
5) Is the power key pressed?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed?
8) Enter factory mode.
9) Save the power key status into EEPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an interrupt request?
14) Wake up the scalar.
15) Are there any signals coming from analog port?
16) Display "No connection Check Signal Cable" message. And go into standby mode after the
message disappears.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed?

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Main Board Layout
715G2883 1 6
Symbol Description Symbol Description
U401 TSUM1PEL PQFP-100 TSUMU5PEHL-LF
PQFP-100(Dual-Input Model) CN302 WAFER
U701 AP1117E33L-13 CN701 CONNECTOR 9P 2.0
U106 AZC099-04S SOT23-6L CN402 CONN 6PIN 2.0
U103 AZC099-04S SOT23-6L CN101 D-SUB 15PIN VERTICAL CONN WITH SCREW
U402 EN25F20-100GCP 2Mb SOP-8 CN102 DVI 24PIN CONN F ATTACHED
SCREW(Dual-Input Model)
U104 AZC099-04S SOT23-6L U105 AZC099-04S SOT23-6L(Dual-Input Model)
X401 14.31818MHZ/32PF/49US U107 AZC099-04S SOT23-6L(Dual-Input Model)
U106 AZC099-04S SOT23-6L(Dual-Input
Model)

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Installation
To install the monitor to your host system, please follow the steps as given below:
Steps
1. 1-1 Connect Video Cable
a. Make sure both the monitor and computer are powered-OFF.
b. Connect the VGA video cable to the computer.
1-2 Digital Cable (Only Dual-Input Model)
a. Make sure both the monitor and computer are powered-OFF.
b. Connect one end of the 24-pin DVI cable to the back of the monitor and connect the other end to the
computer’s port.
1-3 Connect one end of the 19-pin HDMI cable to the back of the monitor and connect the other end to the
computer’s port(Optional).
2. Connect the Audio Cable (Only Audio-Input Model)(Optional)
3. Connect power cord
Connect the power cord to the monitor, then to a properly grounded AC outlet.
4. Power-ON Monitor and Computer
Power-ON the monitor first, then power-ON the computer. This sequence is very important.
5. If the monitor still does not function properly, please refer to the troubleshooting section to diagnose the problem.