AOC E2252VW User manual

ServiceManual AOCe2252VW
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LCD 显示器维修手册
Custom：AOC
Model：e2252VW
本手册适用于主板为 715G4502，Scalar IC NT68660
This manual applies to mainboard715G4502，Scalar IC NT68660

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REVISION LIST
Version Release Date Revision
History Model TPV Model No Editor
A00 Jun-28-2011 Initial Release AOCe2252VW TIAAN22YAYA1HNJ TPV-BJ-Rainsun

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CONTENTS
1. LCD Specifications...................................................................................................................................4
1.1 Product Features ...............................................................................................................................4
1.2 Factory preset modes ........................................................................................................................5
1.3 New Features..................................................................................................................................... 5
1.4. DVI+VGA Interface description.........................................................................................................6
2. Operation instruction................................................................................................................................7
2.1 Connection.........................................................................................................................................7
2.2 Control Buttons ..................................................................................................................................7
2.3 OSD User mode adjustment..............................................................................................................8
2.4 OSD Locked.....................................................................................................................................12
3. Panel Feature ........................................................................................................................................13
3.1 General Specifications .....................................................................................................................13
3.2 Electrical Absolute Ratings ..............................................................................................................13
3.3 Electrical Characteristics .................................................................................................................14
3.4 TFT LCD Module Block Diagram.....................................................................................................14
3.5 LCD module input terminal pin assignment ....................................................................................15
3.6 LED Interface ................................................................................................................................15
3.7 Optical Specifications.......................................................................................................................16
4.Block Diagram.........................................................................................................................................17
4.1 LCD Block Diagram .........................................................................................................................17
4.2 MainBoard Block Diagram...............................................................................................................17
4.3 Power Board Block Diagram ...........................................................................................................18
4.4 Software Flow Chart ........................................................................................................................19
5. Circuit Schematic...................................................................................................................................20
5.1 Main Board 1-715G4502 .................................................................................................................20
5.2 Power Board 715G4750-P0C..........................................................................................................26
5.3 Converter Board -715G3977-P0C...................................................................................................27
5.4 Key Board 715G4851k..................................................................................................................28
6. Monitor exploded view ...........................................................................................................................29
7. PCB Layout ............................................................................................................................................30
7.1 MainBoard 715G4502......................................................................................................................30
7.2 PowerBoard 715G4750-P0C...........................................................................................................32
7.3 Converter Board 1-715G3977 .........................................................................................................33
7.4 KeyBoard715G4851 ........................................................................................................................34
8. Maintenance Trouble treatment.............................................................................................................35
8.1 Maintainability Requirement ............................................................................................................35
8.2 Disassembly SOP............................................................................................................................35
8.3 Trouble Shooting..............................................................................................................................38
8.4 Software update step.......................................................................................................................43
8.5 Re-Writing DDC program step.........................................................................................................49
8.6 Factory mode adjustment ................................................................................................................52
9.BOM List .................................................................................................................................................54
9.1 Model：TIAAN22YAYA1HNJ...........................................................................................................54

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1. LCD Specifications
1.1 Product Features
Monitor Model AOC e2252VW
LCD Panel
Driving system TFT Color LCD
Active Display Area 476.64mm (W)×268.11mm(H) 546.86mm diagonal
Pixel Pitch 0.24825 mm×0.24825mm
Input
Video
R,G,B Analog Interface，75ohm,0.7V
DVI digital Interface
Separate Sync. H/V TTL
H-Frequency 30kHz—80kHz
V-Frequency 56Hz--75Hz
Input Connector
D-Sub 15pin
DVI 24pin
Display Colors 16.7M Colors
Dot Clock 108MHz
Max. Resolution 1600 x 900@60Hz
Plug & Play VESA DDC2B DDC/CI
Power Consumption
ON Mode <35W
Power Saving Mode <1W
Switch OFF <0.5W
Power Source 90~264VAC,47~63Hz, 1.5A Max supply current
Environmental
Considerations
Operating Temp: 0° to 40°C
Storage Temp.: -20° to 60°C
Operating Humidity : 8% to 80%
Altitude：Operating 0~3,658m (0~12,000ft)
Non-Operating 0~12192m (0~40,000ft)
Dimensions(including stand) 496.5(W)x378.6(H)x186 (D)mm
Weight (N. W.): 3.5kg
Safety FCC B CE mark CCC IEC950CB etc.

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1.2 Factory preset modes
STANDARD RESOLUTION HORIZONTAL
FREQUENCY
VERTICAL
FREQUENCY
VGA
640×480 31.469kHz 59.94Hz
640×480 35.00kHz 66.67Hz
640×480 37.861kHz 72.80Hz
640 × 480 37.50kHz 75.00Hz
DOS-mode
640 × 480 31.469kHz 70.087Hz
720 × 400 31.469kHz 70.087Hz
Mac-mode 832 ×624 49.725kHz 74.50Hz
SVGA
800 × 600 35.16kHz 56.25Hz
800 × 600 37.879kHz 60.317Hz
800 × 600 48.07kHz 72.188Hz
800 × 600 46.875kHz 75Hz
XGA
1024 × 768 48.363kHz 60Hz
1024 × 768 56.476kHz 70Hz
1024 × 768 60kHz 75Hz
1280 × 720 45kHz 60KHz
WXGA 1600 × 900 60.00kHz 60Hz
WSXGA
+
1920 x 1080@60Hz 67.5kHz 60.000Hz
1920 x 1080@60Hz 67.158kHz 59.963Hz
1.3 New Features
21.5”W Active matrix LCD panel，LED driver backlight;
Resolutions: 640 x 480 up to 1920 x 1080/60HZ
Dynamic Contrast Ratio(DCR) 20000000:1
Display Interface: VGA, DVI；EPA 5.0

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1.4. DVI+VGA Interface description
VGA 15pin Connector
Pin No. Description Pin No. Description
1. Red Input 9. +5VDC
2. Green Input 10. Logic GND
3. Blue Input 11. N/A
4. N/A 12. SDA- DDC-Serial Data
5. Connection detect 13. H Sync
6. Red GND 14. V Sync
7. Green GND 15. SCL- DDC-Serial Clock
8. Blue GND
VGA Connector layout
15
610
11 15
DVI Connector
Pin No. Description Pin No. Description
1. TMDS Data 2- 13. TMDS Data 3+
2. TMDS Data 2+ 14. +5V Power
3. TMDS Data 2/4 Shied 15. Ground (for +5V)
4. TMDS Data 4- 16. Hot Plug Detect
5. TMDS Data 4+ 17. TMDS Data 0+
6. DDC Clock 18. TMDS Data 0-
7. DDC Data 19. TMDS Data 0/5 Shield
8. N.C. 20. TMDS Data 5-
9. TMDS Data 1- 21. TMDS Data 5+
10. TMDS Data 1+ 22. TMDS Clock Shield
11. TMDS Data 1/3 Shield 23. TMDS Clock+
12. TMDS Data 3- 24. TMDS Clock-
DVI Connector layout

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2. Operation instruction
2.1 Connection
The power cord should be connected.
Connect the video cable from the video card of PC to the monitor.
Press the power button to turn on the monitor, the power indicator will light up.
2.2 Control Buttons
Control Button Description
1
To turn ON/OFF the moniteor, and power indicator
(Green/Orange).
2 Menu / Enter
Active main menu while no OSD display,enter next level on
main menu or sub menu status, or enter last level on
adjustment bar. Select Exit icon then press Menu button to
return to superior menu.
3Auto/Exit
Hotkey ,Input Source selection.
There is OSD, press Auto button to exit OSD.
4 +/4:3 or wide
/up
Hotkey, chang 4:3 or wide image ratio or do auto configure
OSD, increase current value of bar, or move to next item of
menu
5 -/Down
Hotkey, Switch display mode
OSD, it will decrease current value of bar, or it will move to
last item of menu.

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2.3 OSD User mode adjustment
a) OSD Menu adjustment steps:
1. Press MENU to activate OSD main menu, Touch +/ - button may select other Menu item..
2. Press MENU button to select items of each main menu.Touch +/ - to move and select.
3. Press MENU may select item you wish to enter. Touch +/ - to adjust item you selected.
4. Press MENU button to enter,
5. Press AUTO to EXIT OSD
6. Repeat steps 2-5 to adjust an additional item,

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b) hotkey OSD Menu as shown below
AUTO
Source selection
+
Screen switching
_
Switch display mode

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2.4 OSD Locked
When press “ ” to switched on the monitor, while holding press the” menu” button, the menu
will be locked. Again, the OSD menu is non-locked.

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3. Panel Feature
This specification applies to the 21.5 inch-wide Color a-Si TFT-LCD Module M215HW01.The display supports the Full
HD - 1920(H) x 1080(V) screen format and 16.7M colors (RGB 6-bits + Hi-FRC data). All input signals are 2-channel
LVDS interface and this module doesn’t contain an driver board for backlight.
3.1 General Specifications
3.2 Electrical Absolute Ratings

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3.3 Electrical Characteristics
LED array ELECTRICAL CHARACTERISTICS
3.4 TFT LCD Module Block Diagram

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3.5 LCD module input terminal pin assignment
3.6 LED Interface
LED connector on Backlight Unit pin configuration CI1406M1HRB-NH

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3.7 Optical Specifications

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4.Block Diagram
4.1 LCD Block Diagram
4.2 MainBoard Block Diagram
Crystal
14.318MHz
Panel Interface
(CN301/302)
MCU-Scarlar NT68660
(Include ADC, OSD, MCU)
(U401)
D-Sub
Connector
(CN101)
EEPROM
MX25L2026
(U402)
H sync
V sync
Key Board
Control
(CN401/402)
Voltage converter
5V
5V 3.3V 1.8V
DVI
Connector
(CN102)
Converter
AC-DC(5V/12V)
Power Board
Main Board
715G4502
Key board PC- VGA
/DDC
LED-bar backlight
Panel
LVDS
AC supply
90V-264V
Monitor Block Diagram
PC- DVI
/DDC
Input signal

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4.3 Power Board Block Diagram
Power MOS
MP3389
EMI Filter
16V Output
Dimming Signal
8A/700V
Protection Circuit
AC Input
Condenser
AUDIO
(2)10A/200V
Input Filter
Feedback Circuit
5V Output
Feedback Circuit
LD7750RGR
MMD 21.5" LIPS Block Diagram
Bridge Rectification
Rectifier Diode
BOOST
Flyback
LED Light bar
(1)10A/60V
CN902
Adapter IC
Transformer
2A 800V
ON/OFF Signal
Inverter IC

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4.4 Software Flow Chart
Start
Initial_MCU
Check if DataBuffer Is blank
Check if Sum is chan
g
ed ?
To Write default values
Read parameter_from Buffer
PowerHandler
Init_GlobalVariables
Initial_MCU Device
while
InputTiming
ModeHandler
MenuHandler
DebugHandler
if standby mode?
Brightness
Contrast
Language
InputType InputTimingStableCounter
OsdCounter
PowerDownCounter
LED turn-on
Show power on logo
if factory mode?
No signal message
UnsupportModeFlag
END
OSD Menu
Software Flow Chart
InputTiming
Phaes/Frequency
Image setup
Color
Oi
Enter factory mode OSD
Y
N
Y

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5. Circuit Schematic
5.1 Main Board 1-715G4502
03.DVI INPUT
03.DVI INPUT
RX0+
RX0-
RX1-
RX1+
RX2+
RX2-
RXC-
RXC+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
EDID_WP
+5V
DVI_HPD
Audio_EN
AVS0
on_BACKLIGHT
+5V
PS_EN
EDID_WP
VLCD
Adj_BACKLIGHT
Audio_DET
+5V
RX1+
04.SCALER
04.SCALER
Adj_BACKLIGHT
on_BACKLIGHT
Audio_EN
Audio_DET
PS_EN
Panel_ON
PB[0..9]
PA[0..9]
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
RXC+
RXC-
RX2-
RX2+
RX1+
RX1-
RX0-
RX0+
DDCSCL2
DDCSDA2
DVI_CABLE_DET
DVI_HPD
VCC1.8
VCC3.3
+5V
P_SCL
P_SDA
VLCD
DDCSCL1
02.INPUT
02.D-SUB INPUT
R0+
R0-
SOG_DET
G0+
G0-
B0+
B0-
+5V
AHS0
AVS0
DDCSCL1
DDCSDA1
EDID_WP
VGA_CABLE_DET
DVI_CABLE_DET
RX1-
R0-
EDID_WP
RXC-
Panel_ON
DDCSDA2
PB[0..9]
VCC3.3
PA[0..9]
DDCSCL2
DVI_HPD
+5V
G0+
VCC1.8
AHS0
+5V
R0+
SOG_DET
RX0-
EDID_WP
05.PANEL INTERFACE
05.PANEL INTERFACE
VLCD
PA[0..9]
PB[0..9]
P_SCL
P_SDA
VGA_CABLE_DET
G0-
RX0+
06.POWER
06.POWER
Adj_BACKLIGHT
on_BACKLIGHT
Audio_EN
Audio_DET
PS_EN
Panel_ON
+5V
VCC3.3
VCC1.8
VLCD
B0+
RX2+
DDCSDA1
RX2-
VCC1.8
VCC3.3
B0-
RXC+