Acer SG G235H Schematic

G235H
Service Manual

Service Manual

LCD Monitor G235H

Copyright

Copyright 2009 Innolux Display Corp. Ltd

All Rights Reserved

This manual may not, in whole or in part, be copied, Photocopied, reproduced, translated, or converted to any
electronic or machine readable form without prior written permission of Innolux Display Corp. Ltd.

G235H Wide Service Manual

- 0 -

1

Table of Contents

Important Safety Notice ......................................................................................02

01 Product Specification .......................................................................................03

02 Flat Panel Specification ....................................................................................29

03 Exploded Diagram ............................................................................................61

04 Troubleshooting..................................................................................................66

05 Spare Parts List .................................................................................................73

06 Schematics and Layouts....................................................................................77

07 Assembly and Disassembly .............................................................................92

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Important Safety Notice

1. Safety precautions

This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However,
improper usage or installation may cause damage to the monitor as well as to the user.

Warnings:

z This monitor should be operated only at the correct power sources indicated on the label on the rear of the

monitor. If you’re unsure of the power supply in you residence, consult your local dealer or Power
Company.

z Do not try to repair the monitor by yourself, as it contains no user-serviceable parts. This monitor should

only be repaired by a qualified technician.

z Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock to

human bodies.

z Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.
z Put your monitor only in a lean, cool, dry environment. If it gets wet, unplug the power cable immediately

and consult your closed dealer.

z Always unplug the monitor before cleaning it. Clean the cabinet with a clean, dry cloth. Apply

non-ammonia based cleaner onto the cloth, not directly onto the class screen.

z Do not place heavy object on the monitor or power cord.

2. Product safety notice

Many electrical and mechanical parts in this chassis have special safety visual inspections and the
protection afforded by them cannot necessarily be obtained by using replacement components rated for
higher voltage, wattage, etc. Before replacing any of these components read the parts list in this manual
carefully. The use of substitute replacement parts, which do not have the same safety characteristics as
specified in the parts list, may create shock, fire, or other hazards.

3. Service notes

z When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

z Keep wires away from high voltage, high temperature components and sharp edges.

z Keep wires in their original position so as to reduce interference.

z Adjustment of this product please refers to the user’s manual.

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01 Product Specification

1. General:

G235H series LCD monitor is designed with a wide screen 23.0” WSXGA+ TFT LCD panel, LVDS interface, analog RGB signal

input. Additional a DVI-D&HDMI input function is as option block..

It featured with embedded universal AC power supply. This monitor can support maximum resolution up to 1920 x 1080@60Hz. It

support HDCP and color management function.

Details in this document DVI&HDMI referred to is an option function depending on client’s requirement. In our factory, products

should be distinguished by module names.

1.1 Main Features

Maximum resolution : 1920 x 1080 @ 60Hz
Back light system : 4 CCFL (top & bottom edge side)
Pixel pitch : 0.2652 (H) x 0.2652 (V)
Display area : 509.184(H)x286.416(V) 23.0 inch diagonal

Brightness : ≥250cd/m²
Contrast ratio : 1000
ACM (option) :80000:1
Response time (Tr+Tf) : 5ms (typ.) (2)
GTG (Option) : 2ms

Viewing angle : 170°(H)/ 160°(V), typ (3)

Input interface : Analog (D-sub 15 pin)

Digital Option(DVI-D 24 pin)

Power management : Compatible with VESA DPMS
Plug & Play : VESA DDCCI

OSD language

Non EU version : English, French, German, Italian, Spanish, Chinese S. Chinese T. Japanese
EMEA version : English, French, German, Italian, Spanish, Dutch, Finnish, Russian
Russian version : Russian

Universal AC power supply

Note (1)(2)(3): This item spec depend on the LCD panel.

׃1 (typ.) (1)

1.2 Accessories

Items

Description

AC Power Cord(option) : 1.8 m. (Black. Cord type depend on sale region)
VGA cable : 1.8 m. (15 pin D-SUB, black cable with blue male connector)

Quick-start Guide : User manual English (640Mb CD)
Audio cable : 1.8m. (Green/Blue header)
DVI cable : 1.8 m. (18+1 pin, black cable with white connector)

Power cable

(option)

1.8m 1.8m 1.8m 1.8m 1.8m Multi Multi Multi

● ● ● ●

VGA

cable

2. Operation Specifications

The unit should suffer no visible cosmetic damage and should operate with no degradation in display quality during

exposure to the operating conditions and after exposure to the non-operating conditions, in any sequence.

2.1 Environmental conditions

2.1.1 Operating:

DVI

Cable

Audio

cable

HDMI cable

Warranty

card

● ●

Quick-start

Guide

Camera CD

Wizard

Temperature range : 0°C to 40°C

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Relative humidity : 20% to 90%

2.1.2 Storage

Temperature range : -20°C to 60°C

Humidity range : 10% to 90%

2.1.3 Altitude

Operating 10000 ft (Ta=50, t=24h)

Storage 40000 ft (Ta=30, t=24h )
Note 1: Temperature and relative humidity range must be in the area shown as the following figure due to panel limited
Note 2: Altitude spec must not over panel spec.

note 1

note 2

:

Figure 1 Absolute Ratings of Environment

2.2 Safety, EMC, Ergonomics and Compatibility Requirements

Safety & EMC

Ergonomics

Compatibility

Power Management

UL/ cUL, CE, CB, CCC, Nemko/Ergo, C-Tick (N214), VCCI,
FCC, CCC, BSMI,

Nemko/Ergo,MPR II,ISO13460-2

Windows 98/Me/2000, Windows XP, Window Vista

Energy Star V4

2.3 Electrostatic Discharge Requirements

The subject unit must withstand ±8KV for contact discharge and ±15KV for air discharge of Electrostatic Discharge
and meet the standard of IEC61000-4-2(EN55024). (without discharge on VGA/DVI/HDMI pin)

Item Condition Spec Remark

Contact discharge : +/-4KV

Electrostatic

Discharge

Acer SPEC

Contact discharge : +/-8KV

Air discharge : +/-8KV

Air discharge : +/-15KV

150pF/330ohm.

●

●

Each point 10

times.

1 time/Sec.

2.4 Reliability

The MTBF of this product shall be greater than 50,000 hours excluding the LCD panel. The LCD panel life which is
defined as the time period for the maximum luminance to reduce to 50% of the initial value is 40,000 hours minimum at
the condition of displaying an all WHITE field at mid Brightness and Contrast settings.

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3. Electrical and Optical Characteristics and Performance

3.1 Main Power Supply

3.1.1

Input characteristics

Items Condition Spec Note

AC Input Voltage range Universal input full range 90~264Vac

AC Input Voltage rating Universal input full range 100~240Vac

AC input frequency range 90~264Vac 47~63Hz

AC input frequency rating 100~240Vac 50~60Hz

100Vac 1.5A(max) AC Input Current

240Vac 0.8A(max)

Inrush Current

AC-DC power Efficiency

Note2. Before each test, the buck capacitor needs to be discharged.
Before each test, it must be 10 minutes at least after the latest test.
Hot star not component be damaged.

115Vac,cold star,25°C 35A (max)

230Vac,cold star,25°C 70A(max)

DC output full loading ≥80%

See Note2

3.1.2 Output characteristics

Items Condition Spec Note

Ripple and Noise

DC Output Voltage

DC output loading
capability

Rise Time <50mS

Hold-up time AC input: 100V~240V >10mS

Overshoot <10%

+25V output <2800mv

+5V output
Audio +5V output:

+25V output <480mv

+5V output
Audio +5V output:

25V loading:0.3A~1.4A
5V loading:0.75A~1.8A
Audio 5V: 0A~1.5A

25v loading:0.1A~1.4A
25V loading: 0A

Vcc5V:1.8A,

<150mv
<500mv

<100mv
<100mv

Vcc25V:23.8V~28V
Vcc5V: 4.75V~5.25V
Audio 5V: 4.8V~5.4V

Vcc25V: 23.8V~30V
Vcc5V: 4.75V~5.25V

Vcc25V:1.4A
Audio 5V: 1.5A

System load, see note 3

Dummy load.

For system active.

For power saving or DC
off.

Turn on delay time 2S

Power management See Table-1

Note3: Paralleled a 0.1uF ceramic Cap. And 47uF aluminum Cap. Between the end of DC loading side, Measured
band-width=20MHz. Ripple voltage of +25V is less than 1500mV when enter into burst mode.

3.1.3

Protection characteristics
Protection Condition Spec

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OPP nominal AC input 65W ( min )

SCP(short circuit protection) with auto-recovery function

OVP(Over voltage protection) Auto-recovery

OTP(Over temperature protection) NA

Fuse protection NA

Table-1

Status H-sync V-sync Video Power LED

Power On on on active ≤ 55W Blue

off on blanked < 2W Yellow

Power Saving

Power Off -- -- -- < 1W Off

3.1.4 Backlight Power Supply

on off blanked < 2W Yellow

off off blanked < 2W Yellow

Items Specification

Panel INL_MT230DW01 V.0

<output capacitor voltage.

Lamp 4 CCFL

Input Voltage

Input current

On/Off switch level

Brightness PWM Duty (ACM Off)

Brightness PWM Duty (ACM On)

CCFL operating Voltage 900Vrms (Typ.),

CCFL Current

CCFL startup voltage ≥1500 Vrms (25˚C)

CCFL startup voltage ≥1840 Vrms (0˚C)

Operating frequency 40~60 KHz

Protect delay time

Efficiency ≥75%

Note: Other panels please refer to the reference panel specs.

23.8---28V

1.2A (Typ.), 1.40A (Max.)

2.0V ≤ V on ≤ 3.6 V (on)

-0.3v ≤ V off ≤ 0.8 V (off)

35%~100%

3%~100%

3.0mA (Min.)

7.5mA (Typ.)

8.0mA (Max.)

> 1 second

3.2 Brightness output

The test to verify specifications in this section shall be performed under the following standard conditions unless otherwise
noted.

Temperature : 25 ± 5°C
Test pattern : white
Video Resolution : 1920 x 1080
Video input level : 700 mV ± 2%
Warm-up time : 30 minutes

Set brightness control and also contrast control at maximum, to measure the screen center, the light output shall ≥ 250

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2

cd/m

(as panel spec)

3.3 White balance

The test standard conditions refer to Sec 3.3.(Brightness control is at 100 contrast control is at 50 )

Cool

Warm

User

3.4 Brightness uniformity

The test standard conditions refer to Sec 3.4.

Mode

9300K 0.283 ± 0.030 0.297 ± 0.030

6500K 0.313 ± 0.030 0.329 ± 0.030

Panel While x Panel While y

)(backlight points nine of luminance Min.

≥

)(backlight points nine of luminance Max.

Chromaticity Coordinate

x y

(4)

≥75%

%

75

L/2

4 6

1 2

7

5

8

L/10

W/10

3

9

W/2

Fig.3

Note (4): 75% is for InnoLux panel MT230DW01 V.0(first source).The second source panel spec follow Sec 5.1.

3.5 Audio Signal

Items Specification

10K ohm

Input impedance

Frequency response range

Signal to noise ratio

≥

200Hz –20kHz

40 dB

≥

Output power

Loading impedance

≤

1.5 W + 2 W(±20% tolerance), THD 10%.

4 ohm

4. Input / Output Signal Specifications

4.1 Video signals

Analog

Sync: TTL level (Input impedance 1k Ohm)

RGB signal: 0.7Vp-p (Input impedance = 75 Ohm)

≥

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Positive and negative sync of Separate Horizontal/Vertical Sync

Digital : TMDS Signal: (min) ±200mVpp@24Bit

4.2 Signal Timing

Through D-SUB/DVI/HDMI connectors, this unit can support FH= 31~84 KHz, Fv=56~75Hz, with maximum pixel clock

180MHz input signal and UXGA+ output. Modes details as below:

VESA MODES

Mode Resolution Total

VGA

SVGA

XGA

VESA

SXGA

UXGA

WXGA

WXGA+

WSXGA+

UXGA+

640*480@60Hz 800*525 31.469 N 59.941 N 25.175

640*480@72Hz 832*520 37.861 N 72.809 N 31.500

800*600@56Hz 1024*625 35.156 P 56.250 P 36.000

800*600@60Hz 1056*628 37.879 P 60.317 P 40.000

800*600@72Hz 1040*666 48.077 P 72.188 P 50.000

1024*600@60Hz 1312*622 37.32 P 60.000 P 48.964

1024*768@60Hz 1344*806 48.363 N 60.004 N 65.000

1024*768@70Hz 1328*806 56.476 N 70.069 N 75.000

1152*864@75Hz 1600*900 67.500 P 75.000 P 108.000

1280*960@60Hz 1800*1000 60.000 P 60.000 P 108.000

1280*720@60Hz 1650*750 44.955 P 59.94 P 74.176

1280*1024@60Hz 1688*1066 63.981 P 60.020 P 108.000

1600*1200@60Hz 2160*1250 75.000 P 60.000 P 162.000

1360*768@60Hz 1792*795 47.712 P 60.015 P 85.500

1280*800@60Hz 1680*831 49.702 P 59.810 P 83.500

1440*900@60Hz 1904*931 55.935 P 59.887 N 106.500

1680*1050@60Hz 2240*1089 65.290 N 59.954 N 146.250

1920*1080@60Hz 2200*1125 67.500 N 60.000 P 148.500

1920*1080@60Hz 2576*1120 67.158 N 59.963 P 173.000

Horizontal Vertical

Nominal

Frequency

+/-0.5KHz

Sync

Polarity

Nominal

Frequency

+/-1Hz

Sync

Polarity

Nominal

Pixel Clock

(MHz)

1920*1080@60Hz 2080*1111 66.587 N 59.934 P 138.500

IBM MODES

VESA

720x400@70Hz 900*449 31.469 N 70.087 P 28.322

MAC MODES

640*480@66.66Hz

864*525

35.000 P

66.667 P 30.240

HDMI Preset Timming

Mode Resolution Pixel Clock MHz H sync KHz V sync Hz

VGA 4:3 640 x 480p 25.2 31.5 60

NTSC (480i) 4:3 720 x 480 13.50 15.73 60

NTSC (480i) 16:9 720 x 480 13.50 15.73 60

NTSC (480p) 4:3 720 x 480 27.00 31.47 60

NTSC (480p) 16:9 720 x 480 27.00 31.47 60

PAL (576i) 4:3 720 x 576 13.50 15.63 50
PAL (576p) 4:3 720 x 576 27.00 31.27 50
PAL (576p) 16:9 720 x 576 27.00 31.27 50

720p 16:9 1280 x 720 74.25 37.5 50
720p 16:9 1280 x 720 74.25 44.96 60

1080i 16:9 1920 x 1080 74.25 28.125 50

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1080i 16:9 1920 x 1080 74.25 33.72 60
1080P 16:9 1920 x 1080 148.50 56.250 50
1080P 16:9 1920 x 1080 148.50 67.50 60

Note: 1. Non-interlace signals only (An interlace signal cannot be display)

2. Please refer to F/W specification for more detail

3. Each frequency of Power Macintosh and Sun Ultra is a reference value

4.3 Timing requirements

The LCD monitor must be capable of displaying standard resolutions within the vertical frequency range of 56 ~ 75 Hz
and the horizontal scan range of 31~84 KHz with maximum pixel clock of 180MHz.
Vertical / Horizontal Sync polarity: positive or negative.

If input signal is out of range of horizontal 31~84 KHz or vertical 56-75Hz, or pixel clock large than 180MHz, message

“Input not Supported” is shown on screen.

4.4 DDC date

G235H Analog

0 1 2 3 4 5 6 7 8 9 A B C D E F

00 FF FF FF FF FF FF 00 04 72 CB 00 00 00 00 00

0

00 00 01 03 08 34 1D 78 EA DE 95 A3 54 4C 99 26

1

0F 50 54 BB 8C 10 B3 00 71 4F 81 00 95 00 81 80

2

81 C0 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20

3

25 00 09 25 21 00 00 1F 00 00 00 FD 00 38 4B 1F

4

54 12 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30

5

30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC

6

00 47 32 33 35 48 0A 20 20 20 20 20 20 20 00 A8

7

G235H DVI

0 1 2 3 4 5 6 7 8 9 A B C D E F

00 FF FF FF FF FF FF 00 04 72 CB 00 00 00 00 00

0

00 00 01 03 80 34 1D 78 EA DE 95 A3 54 4C 99 26

1

0F 50 54 BB 8C 10 B3 00 71 4F 81 00 95 00 81 80

2

81 C0 D1 C0 01 01 1A 36 80 A0 70 38 1F 40 30 20

3

25 00 09 25 21 00 00 1F 00 00 00 FD 00 38 4B 1F

4

54 12 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30

5

30 30 30 30 30 30 30 30 30 30 30 0A 00 00 00 FC

6

00 47 32 33 35 48 0A 20 20 20 20 20 20 20 00 30

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G235H HDMI(N/A)

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5. Function Specifications

All the tests to verify specifications in this section shall be performed under the following standard conditions unless

otherwise noted. The standard conditions are:

Temperature : 25 ± 5°C
Warm-up time : 30 minutes minimum
Checking display modes : All the specified modes

5.1 Panel general specifications

5.1.1 General specifications

Supplier: INL

Model name MT230DW01 V.0

Display Area 509.184(H)x286.416(V) mm

Pixel Pitch 0.2652 x 0.2652 mm

Display Colors: 16.7 Million (RGB 8-bit data)

Number of Pixel 1920x1080 pixels

Pixel Arrangement RGB vertical stripe

Brightness 300cd/m2 (Typ.) 250cd/m2 (Min.)

Contrast Ratio 1000:1 (Typ.), 700:1(Min)

Viewing Angle Hor:150°, Ver: 140°(Min, CR>10)

Brightness Uniformity

Display Mode Normally White

Response Time(Tr+Tf) 5ms (Typ.), 10ms (Max.)

Surface Treatment Anti-glare, Hard coating (3H)

Lamp 4 CCFL

5.1.2 LCD module defects

LCD module defects check follows IIS.

Min/Max≧0.75

5.2 Keypad Function

5.2.1

Control buttons

[AUTO]

A. When OSD un-displays, press [AUTO] and the function menu will show on the screen;
B. When function menu displays, press [AUTO] to perform auto-adjustment;
C. When OSD displays, press [AUTO] to return to previous level menu;
D. When “e Color OSD” OSD displays, press [AUTO] to exit the OSD.

A. When OSD isn’t shown on screen, press [MENU] to enter the function menu;

[MENU]

[◄]

[►]

B. When function menu displays, press [AUTO] to enter the main menu OSD;
C. When OSD displays, press [MENU] to perform function of menu icon that is highlight or

enter next level menu

A. When OSD isn’t show on screen, press [◄] to enter the function menu;
B. When “MENU OSD” displays, press these keys to change the contents of an

adjustment item, or change an adjustment value;

C. When Function menu displays, press [◄] to show “Audio” OSD and decrease the

volume.

A. When OSD isn’t show on screen, press [►]to enter the function menu;
B. When “MENU OSD” displays, press these keys to change the contents of an

adjustment item, or change an adjustment value;
C. When Function menu displays:
a. Press [►] key one time to search (a port with signal in order)

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b. Show “source icon” at the same time, as searching that port
c. Go into next port automatically, if search the port without signal

d. Display it, if search the port with signal
D. When the volume menu displays, press [►] to increase the volume.
A. When function menu displays, press [e Color] to show “e Color OSD”, and press

again the OSD can not disappear, but the time of “e Color OSD ”disappearing is reset

[e Color ]

[POWER] Power on or power off the monitor

to 10 seconds again.

B. When OSD disappear not including “e Color OSD”, press [e Color] to show “e Color

OSD” OSD, the OSD before disappears, but the parameters of it should be saved

5.2.2

Hot Key Operation

HOT KEY OPERATION

FUNCTION

FACTORY
MODE

e Color AUTO MENU

●

◄ ►

POWER

ON

Press [e], and then press [POWER] for DC
power on. OSD menu will be shown with “F” on
the left top. Select “F” for entering factory mode.

5.3 OSD Structure

The On-Screen Display (OSD) shall be an easy to use icon based menu through keypad OSD buttons or remote control

unit. The unit shall leave the factory with all OSD controls set to their default values.

First Second Third Fourth

empowering

technology

--- --- ---

Function

Menu

e-color

Auto --- --- --- ---

Main menu Main menu (Pictiure) --- --- ---

Control

Range

DESCRIPTION

Default Value

Audio Audio menu --- --- ---

Input --- --- --- ---

Picture

Acer eColor Management

Brightness --- ---

Contrast --- ---

empowering

technology

--- --- Standard

User mode

Text mode 44

0～100

0～100

Standard mode 77

Graphics mode

Movie mode

User mode

Text mode

Standard mode

Graphics mode

11

77

97

77

50

50

50

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56

H.Position

0～100

Movie mode

50

V.Position

Focus

Clock

Colour Temp

Auto Config --- --- --- ---

OSD OSD Timeout --- ---

Wide Mode

DDC/CI --- --- --- ON

ACM --- --- --- OFF

--- ---

Warm --- --- Default

Cool --- --- ---

Red

User

Full --- --- Default

Aspect --- --- ---

Analog --- --- ---

Green

Blue

0～100

0～100

0～100

0～100

0～100

0～100

10～120

50

---

50 ○

80

80

80

10

1

Setting

Info

Source

Language

Reset --- --- --- ---

Resolution --- --- --- ---

H.Freq --- --- --- ---

V.Freq --- --- --- ---

Digital --- --- ---

HDMI --- --- ---

EMEA NO-EMEA

English English --- ---

Russian

Deutsch Deutsch --- ---

Français Français --- ---

Español Español --- ---

Italiano Italiano --- ---

Dutch

Finnish

繁體中文

简体中文

日本語

--- ---

--- ---

English

--- ---

--- ---

Input Type --- --- --- ---

S/N --- --- --- ---

Volume --- --- --- 0~100 50

Notes; ○

1

Clock default 50 is for Visa timing. Others depend on timing.

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6. SOP of PCBA ISP Programming

6.1 Operational condition:
Equipment: PC, ISP card, signal cable and power cable.
ESD requirements: antistatic wrists, antistatic gloves(fingers), and connecting cable
Name of ISP program: ISP_Tool_V4.4.2.4
Manufacture of FW IC : PMC/SST/MX

6.2 Operational steps:

1. Connection: connect PC to PCBA with signal cable, and then keep AC and DC in open state.

Signal cable

One port of ISP

program card is

connected to

PC

2. Adjust ISP programming

Firstly, double click ISP_Tool_ V4.4.2.4 exit and click “Connect ” button; The ISP tool will connect to
monitor automatically, and it will show flash IC type automatically

FW IC
Model

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Secondly﹐download FW software: first select “READ”, and then load FW software in Rooter
(Fig.2).

Software

Checksum value

FW BIN file

Thirdly, select “AUTO”, and keep its default value. Click “RUN” for beginning programming. There will
be prompting if programming is OK.

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◆Note: if programming fails or success rate is not high, click “Config” and adjust its speed to lower

in “I2C Speed Setting”and check Communication Setting. If connect port is print port, please check
port type.

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3. Flow Chart

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7. SOP of EDID

7.1 Request of hardware and software:

1. Software
a.port95nt.exe
b.Edid.exe
c.G235H model

2. Hardware
a. PC(winXP or win2000) 1PCS;
b. Tool(EDID Card, VGA cable & DVI cable)

7.2 Operational steps:

1. First set up Port95nt.exe

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2. Click next button continually then can finish setting.

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EDID Tool Set up

A : USB interface provide +5V DC power（No Power is ok ）
B : Connect DDC Card and PC with collateral interface ；
C :VGA、DVI use different cable to link DDC and PC

A

A

B

B

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C

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EDID ISP Card:

C

A

B

A：Collateral printing interface (connect with PC)
B : VGA interface (one VGA connect with PC to provide signal for monitor the other one connect with

PC VGA interface to write VGA EDID, Write EDID can without providing signal)

C : DVI interface (connect with Monitor)

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3. Write EDID Process：

3.1 Choose File menu in main menu ，choose Auto Write button，click S/N blank .

G235H

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3.2 Cloose the Model in main menu, and the password is 1234.

G235H

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