This manual contains information about maintenance and service of acer products. Use this manual to
perform diagnostics tests, troubleshoot problems, and align the acer product.
1.1. Trademark
The following terms are trademarks of Acer Inc. :
Acer
Importance
Only trained service personnel who are familiar with this Acer Product shall perform service or
maintenance to it. Before performing any maintenance or service, the engineer MUST read the “Safety
Note”.
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2. Introduction
This section contains general service information, please read through carefully. It should be stored for
easy access place for quick reference.
2.1. RoHS (2002/95/EC) Requirements
– Applied to all countries require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a legal
requirement by EU (European Union) for the global electronics industry which sold in EU and some counties
also require this requirement. Any electrical and electronics products launched in the market after June 2006
should meet this RoHS requirements. Products launched in the market before June 2006 are not required to
compliant with RoHS parts. If the original parts are not RoHS complaints, the replacement parts can be non
ROHS complaints, but if the original parts are RoHS compliant, the replacement parts MUST be RoHS
complaints.
If the product service or maintenance require replacing any parts, please confirming the RoHS requirement
before replace them.
2.2. Safety Notice
1. Make sure your working environment is dry and clean, and meets all government safety requirements.
2. Ensure that other persons are safe while you are servicing the product.
DO NOT perform any action that may cause a hazard to the customer or make the product unsafe.
3. Use proper safety devices to ensure your personal safety.
4. Always use approved tools and test equipment for servicing.
5. Never assume the product’s power is disconnected from the mains power supply. Check that it is disconnected before opening the product’s cabinet.
6. Modules containing electrical components are sensitive to electrostatic discharge (ESD). Follow ESD safety
procedures while handling these parts.
7. Some products contain more than one battery. Do not disassemble any battery, or expose it to high
temperatures such as throwing into fire, or it may explode.
8. Refer to government requirements for battery recycling or disposal.
2.3 .Compliance Statement
Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your
local Laser Safety Compliance Requirements.
2.4. General Descriptions
This Service Manual contains general information. There are 3 levels of service:
Level 1: Cosmetic / Appearance / Alignment Service
Level 2: Circuit Board or Standard Parts Replacement
Level 3: Component Repair to Circuit Boards
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3. Product Overview
Feature items
Specifications
Remark
Panel supplier & module name
SEC LTM200KT01 (4L)
TN, Normally white
Screen diagonal
20W”
Display Format
1600(H) x 900 (V)
Panel Display information
Pixel Pitch
0.2768 mm x 0.2768mm
per one triad
Viewing Angle (@ Contrast Ratio >= 10)
SEC LTM200KT01
R/L: 160(typ), 140 deg(min)
U/D: 160(typ), 140 deg(min)
Analog interface with Scaling supported
Yes
With 15-pin D-sub
connector
HDMI interface with Scaling supported
No
Only For 1A2H model
Panel native resolution supported
1600 (H) x 900 (V)@60Hz
Number of Display Colors supported
16.7 Millions
RGB 6-bit +Hi-FRC
Contrast Ratio
SEC:1000:1 (typ.), 600:1(min)
Test Condition: Set Contrast at
50, Brightness at 100, Color at
User preset
ACM
50000:1
3.1. Introduction
G205H is defined as our new 20’ W model in ACER G series which will be the ACER project in
Qisda. G205H is defined as 20’ W LCD Monitor supports 1600(H) x 900(V) resolution with DPMS
(Display Power Management System) and ACER eColor function. There are double input types,
D-sub, and DVI. G205H adopts SEC LTM200KT01 (glare with 4 lamps). G205H has included
1W+1W speaker. G205H also support ACM 50000:1.
The features summary is shown as below,
*All panel spec. in Q201 definition depends on the variance of panel source.
*All spec. of monitor need to warm up at least 1hr.
* To test the “ Contrast Ratio” and “ Luminance” functions, the color status must be
“ User preset” mode.
* 1. “ Contrast Ratio” : Set “ brightness” at 100, and “ contrast” at 50.
* 2. “ Luminance” : Set “ brightness” at 100, and “ contrast” at 100.
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Luminance
4L:300 (typ.),250 cd/m2 (min)
Test Condition: Set Contrast at
50, Brightness at 100, Color at
User preset
AC power input
Yes
90-264 Volts, 47-63 Hz.
DC power input (with AC power adapter)
No
DPMS supported
Yes
<1W
LED indicator for power status showed
Yes
Blue/Amber
OSD for control & information supported
Yes
Multi-language supported for OSD
Yes
EMEA
Non-EMEA
Buttons control supported
Yes
6 buttons including 1 monitor
power on/off control button.
Flywheel control supported
No
Scaling function supported
Yes
Auto adjustment function supported
Yes
DDC function supported (EDID ver. 1.3)
Yes
DDC2B
DDC-CI support version 1.1 or later
Yes
DDC-CI
Audio speakers supported
Yes
Audio Jack (input connector) supported
Yes
Line-in connector
Earphone Jack (Output connector)
supported
No
Microphone function supported
No
Mechanical Tilt base design
Yes
From -5 to +23 degree
VESA wall mounting design
Yes
Mechanical Rotate design
No
Mechanical Lift base design
No
Kensington compatible lock design
Yes
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- 7 -
Item
Condition
Spec
OK
N.A
Remark
Input Voltage range
Universal input full range
90~264VAC /47~63Hz
Input Current range
90 ~ 264VAC
4CCFL ≦ 1.5Arms
Power Consumption
Normal “ On”
operation
4CCFL < 52 W
LED: Blue
DPMS
DPMS “ Sleep” state
< 1 W
LED: Amber
DPMS
DPMS “ Off” state
< 0.5 W
LED: OFF
Inrush Current
115 VAC
230 VAC
< 35 A (peak)
< 70 A (peak)
Cold-start
Meet Acer Monitor
General Spec.
Earth Leakage Current
264 VAC/50Hz
< 3.5 mA
Hi-Pot
1. 1500VAC, 1 sec
2. Ground test: 30A,
1sec
Without damage
< 0.1 ohm
(on-line test)
(in-lab test)
Power Line Transient
IEC1000-4-4
1KV
IEC1000-4-5 (Surge)
Common: 2KV,
Differential: 1KV
CCFL operation range
90 ~ 264VAC
3.0mA~8.0mA
Depends on panel
source
CCFL Frequency
90 ~ 264VAC
40KHz ~ 80KHz
Depends on panel
source
Power cord
Color: Black
Length: 1800 +/- 50 mm
3.2. Operational Specification
3.2.1 Power supply
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3.2.2 Signal interface
Item
Condition
Spec
OK
N.A
Remark
Signal Cable
15-pin D-Sub
Color: Black
Length: 1800 +/- 30 mm
24-pin DVI-D
Color: Black
Length: 1800 +/- 50 mm
Pin assignment
15-pin D-sub connector
See Note-1
For 15-pin D-sub
24-pin DVI-D connector
See Note-2
For 24-pin DVI-D
19-pin HDMI connector
See Note-3
For 19-pin HDMI
Analog input
Signal type
Separate analog R/G/B
For 15-pin D-sub
Level
700 mV (peak to peak)
Impedance
75 Ohms +/- 1.5 Ohms
Sync input
Signal type
Separate H/V-sync
Composite H/V-sync
(Positive/Negative)
For 15-pin D-sub
Level
Logic High: 2.4V ~ 5.5V
Logic Low: 0V ~ 0.5V
(TTL level)
Refer to VESA VSIS
Standard V1R1
Impedance
Minimum 2.2KΩ (pull
down)
10KΩ for application
Sync Pulse Width (SPW)
0.7μ s < H-SPW
1H < V-SPW
Digital input
Level
600mV for each
differential line
Impedance
50 Ohm TDR Scan
needed for DVI cable and
interface board
P
in
Signal Assignment
Pin
Signal Assignment
1
Red video
9
PC5V (+5 volt power)
2
Green video
10
Sync Ground
3
Blue video
11
Ground
Note-1: The pin assignment of 15-pin D-sub connector is as below,
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4
Ground
12
SDA
5
Ground(Cable Detected)
13
H-Sync (or H+V)
6
Red Ground
14
V-sync
7
Green Ground
15
SCL
8
Blue Ground
P
Signal Assignment
Pin
Signal Assignment
1
TMDS RX2-
13
Floating
2
TMDS RX2+
14
+5V Power
3
TMDS Ground
15
Ground
4
Floating
16
Hot Plug Detect
5
Floating
17
TMDS RX0-
6
DDC Clock
18
TMDS RX0+
7
DDC Data
19
TMDS Ground
8
Floating
20
Floating
9
TMDS RX1-
21
Floating
10
TMDS RX1+
22
TMDS Ground
11
TMDS Ground
23
TMDS Clock+
12
Floating
24
TMDS Clock-
Note-2: The pin assignment of 24-pin DVI-D connector is as below,
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3.2.3 Video performance
Item
Condition
Spec
OK
N.A
Remark
Max. support Pixel rate
151.25 MHz
Both for analog and
digital inputs
Max. Resolution
1600 x 9000
Both for analog and
digital inputs
Rise time + Fall time
< 5 ms
(50% of minimum pixel
clock period)
1600x900 @ 60Hz
(max. support timing)
Settling Time after
overshoot /undershoot
< 5% final full-scale value
Refer to VESA VSIS
Standard V1R1
Overshoot/Undershoot
< 12% of step function
voltage level over the full
voltage range
Refer to VESA VSIS
Standard V1R1
Item
Condition
Spec
OK
N.A
Remark
Horizontal
31-83 KHz
Vertical
56-76 Hz
HDMI supports 50Hz
Item
Condition
Spec
OK
N.A
Remark
DDC channel type
DDC2B
EDID
Version 1.3
Refer to S/W spec.
document to see the
detailed EDID data
definition.
DDC-CI
Version 1.1 or Later
Refer to S/W spec
640x480@60Hz
800 x 525
31.469
59.941
25.175
640x480@72Hz
832 x 520
37.861
72.809
31.500
640x480@75Hz
840 x 500
37.500
75.000
31.500
640x480@66.66Hz
864x525
35
66.66
30.24
720x400@70Hz
900x449
31.469
70.087
28.322
800x600@56Hz
1024 x 625
35.156
56.250
36.000
800x600@60Hz
1056 x 628
37.879
60.317
40.000
800x600@72Hz
1040 x 666
48.077
72.188
50.000
800x600@75Hz
1056x625
46.875
75.000
49.500
832x624@74.55Hz
1152x667
49.722
74.55
57.28
1024x768@60Hz
1344x806
48.363
60.004
65.000
1024x768@70Hz
1328x806
56.476
70.069
75.000
1024x768@75Hz
1312x800
60.023
75.029
78.750
1152x870@75Hz
1456x915
68.681
75.062
100.000
1152x864@75Hz
1600x900
67.5
75
108
1280x960@60Hz
1800x1000
60
60
108
1280x1024@60Hz
1688x1066
63.981
60.020
108.000
3.2.4 Scan range
3.2.5 Plug & Play DDC2B DDC-CI Support
3.2.6 Support Timings
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1280x1024@75Hz
1688x1066
79.976
75.025
135.000
1280x720@60Hz
1650x750
44.955
59.940
74.176
1280x800@60Hz
1680x831
49.702
59.810
83.500
1360x768@60Hz
1792x795
47.712
60.015
85.500
1600x900@60Hz
2122x934
55.990
59.946
118.250
1600x900@60Hz_RB
1800x1000
60.000
60.000
108.000
1600x900@75Hz
2144x942
70.546
74.889
151.250
Note:
Item
Condition
Spec
OK
N.A
Remark
Resolution
Any input resolution modes
which are under 1600x900
1600x900
Contrast ratio
1000(typ.)
Test Condition: Set
Contrast at 50,
Brightness at 100,
Color at User preset.
Brightness
At R/G/B saturated condition
300 cd/m2 (typ.),250 cd/m2
(min)
Test Condition: Set
Contrast at 50,
Brightness at 100,
Color at User preset.
Response time
Rising + Falling time
On/off:5 ms (typ.),10ms(max)
Test Equipment:
Westar TRD 100 or
equal level equipment ;
Viewing angle
At Contrast ratio = 10
R/L: 80/80 degrees (typ.)
70/70degrees (min)
At Contrast ratio = 10
U/D: 80/80 degrees (typ.)
70/70 degrees(min)
CIE coordinate of White
(0.31, 0.33) +/- (0.03, 0.03)
Display colors
16.7 Millions colors
6 bit+Hi-FRC
Item
Condition
Spec
OK
N.A
Remark
Brightness adjustable range
At default contrast level
(saturate point) & Full-white
color pattern
(Max. brightness value –
Min. brightness value)
≧ 100 cd/㎡
1. Show “Input Not Supported” warning message.
When Vertical Frequency is over 76Hz or under 56Hz, the display is Black and showing “Input Not
Supported” warning message. (HDMI supports 50Hz for PAL video signals.)
2. If Hf /Vf is set in the range of 31KHz~83KHz and 56Hz ~76Hz, but is not the above Resolution, then it
will display the nearest mode.
3.3. Operational & Functional Specification
3.3.1 Video performance
*All spec. of monitor need to warm up at least 1hr.