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EN7220
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AOC EN7220 Schematic

EN7220 Service Manual
SERVICE MANUAL
17” LCD Monitor
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
Manufacture Date:Apr-09-04
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EN7220 Service Manual
Table of Contents
Table of Contents ---------------------------------------------------------------------- 02
Revision List ---------------------------------------------------------------------------- 04
1. Monitor Specification --------------------------------------------------------------05
2. LCD Monitor Description ---------------------------------------------------------05
3. Operation Instructions -------------------------------------------------------------06
3.1 General Instructions -----------------------------------------------------------06
3.2 Adjusting The Picture ---------------------------------------------------------06
4. Input/Output Specification ------------------------------------------------------- 08
4.1 Input Signal Connector -------------------------------------------------------08
4.2 Factory Preset Display Modes ---------------------------------------------09
4.3 Power Supply Requirements -----------------------------------------------10
4.3.1 Input/Output Requirements --------------------------------------------10
4.3.2 Inverter Max Brightness ------------------------------------------------10
4.3.3 Inverter Min Brightness -------------------------------------------------10
4.4 Panel Specification (QDI L07) ----------------------------------------11
4.4.1 Display Characteristics -------------------------------------------------11
4.4.2 Optical Characteristics ------------------------------------------------12
4.4.3 Parameter guide line for CCFL Inverter -------------------------12
5. Block Diagram -----------------------------------------------------------------------13
5.1 Monitor Exploded View -----------------------------------------------------13
5.2 Software Flow Chart -----------------------------------------------------------14
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EN7220 Service Manual
5.3 Electrical Block Diagram -----------------------------------------------------16
5.3.1 Scalar Board --------------------------------------------------------------16
5.3.2 Inverter/Power Board ---------------------------------------------------17
6. Schematic ----------------------------------------------------------------------------19
6.1 Scalar Board --------------------------------------------------------------------19
6.2 Inverter/Power Board ------------------------------------------------------22
6.3 Key Pad Board -----------------------------------------------------------------24
7. PCB Layout --------------------------------------------------------------------------25
7.1 Main Board ---------------------------------------------------------------------25
7.2 Inverter/Power Board --------------------------------------------------------26
7.3 Keypad Board -----------------------------------------------------------------26
8. Maintainability -----------------------------------------------------------------------27
8.1 Equipments and Tools Requirements -----------------------------------27
8.2 Trouble Shooting -------------------------------------------------------------28
8.2.1 Main Board -------------------------------------------------------------28
8.2.2 Power/Inverter Board --------------------------------------------------31
8.2.3 Key Pad Board ------------------------------------------------------------33
9. White-Balance, Luminance Adjustment ---------------------------------------34
10. EDID Content ----------------------------------------------------------------------35
11. BOM List ---------------------------------------------------------------------36～50
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EN7220 Service Manual
1. MONITOR SPECIFICATIONS
Driving system TFT Color LCD
LCD Panel Size 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V )
Viewable angle 140˚ (H) 130˚ (V)
Response time (typ.) 25 ms
Video Analog
Input Sync. Type H/V TTL
H-Frequency 30kHz – 80kHz
V-Frequency 55-75Hz
Display Colors Over 16 million Colors
Dot Clock 135MHz
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Consumption ON Mode
OFF Mode
Maximum Screen Size
Power Source
Environmental
Considerations
Weight (N. W.) Packaged 7.4Kgs Unit
Operating Temp: 0°C to 40°C
<45W
<3W
Horizontal : 13.3”(337.92mm) Vertical : 10.6”(270.336mm)
100~240VAC,47~63Hz
Storage Temp.: -20°C to 60°C
Operating Humidity : 15% to 90%
Unpackaged 6.6Kgs Unit
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EN7220 Service Manual
(
)
)
2. LCD MONITOR DESCRIPTION
The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal
adapter which house the flat panel control logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion.
Monitor Block Diagram
CCFT Drive.
Flat Panel and
CCFL backlight
Power board
include:adapter,inverter
Keyboard
Main Board
RS232 Connector
For white balance
adjustment in
factory mode
AC-IN
100V-240V
HOST Computer
Video signal, DDC
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EN7220 Service Manual
3. OPERATING INSTRUCTIONS
3.1 GENERAL INSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons are located at front
panel of the monitor. By changing these settings, the picture can be adjusted to your personal
preferences.
The power cord should be connected.
-
Connect the video cable from the monitor to the video card.
-
Press the power button to turn on the monitor, the power indicator will light up.
-
3.2 Adjusting the Picture
The descriptions for function control LEDS
Main
Main Menu
Sub Menu
Sub Menu
Menu
Item
Item
Icon
Icon
Contrast
Luminance
Brightness
Focus
Image Setup
Clock
Description
Contrast from Digital-register.
Backlight Adjustment
Adjust Picture Phase to reduce
Horizontal-Line noise
Adjust picture Clock to reduce
Vertical-Line noise.
Adjust
Reset Value
Range
Recall Cool
0-100
Contrast Value
Recall Cool
0-100
Brightness Value
0-100 Do Auto Config
0-100 Do Auto Config
Image
Position
Color Temp.
H. Position
V. Position
Warm N/A
Cool N/A
Adjust the horizontal position of
Adjust the vertical position of the
Recall Warm Color Temperature
Recall Cool Color Temperature
the picture.
picture.
from EEPROM.
from EEPROM.
6
0-100 Do Auto Config
0-100 Do Auto Config
The Color
N/A
Temperature will
be set to Cool.
N/A
EN7220 Service Manual
(Analog-Onl
y Model)
OSD Setup
User / Red
User /
Green
User / Blue
Yes
No N/A
H. Position
V. Position
OSD
Timeout
N/A
Red Gain from Digital-register.
Green Gain Digital-register.
Blue Gain from Digital-register.
Auto Adjust the H/V Position,
Focus and Clock of picture.
Do not execute Auto Config,
return to main menu.
Adjust the horizontal position of
Adjust the vertical position of the
Adjust the OSD timeout.
the OSD.
OSD.
0-100
The User R/G/B
value(default is
100) will not be
0-100
Modified by Reset
function.
0-100
N/A N/A Auto Config
N/A N/A
0-100 50
0-100 50
10-120 10
Language
Information
English N/A
Deutsch N/A
Français N/A
Español N/A
Italiano N/A
简体中文
N/A
Information N/A
Set OSD display language to
English.
Set OSD display language to
German.
Set OSD display language to
French.
Set OSD display language to
Spain.
Set OSD display language to
Italian.
Set OSD display language to
Simplified Chinese.
Show the resolution, H/V
frequency and input port of
current input timing.
Clear each old status of
N/A
N/A
N/A
The Language
will be set to
N/A
English.
N/A
N/A
N/A N/A
Reset
Exit
Yes N/A
Auto-configuration and set the
color temperature to Cool.
N/A N/A
No N/A
N/A N/A
Do not execute reset, return to
main menu.
Exit OSD
N/A N/A
N/A N/A
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4. Input/Output Specification
4.1 Input Signal Connector
EN7220 Service Manual
PIN NO.
DESCRIPTION
DESCRIPTION
PI N NO.
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. NC
4. Ground 12. DDC-Serial Data
5. Ground 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA connector layout
15
6
11 15
10
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EN7220 Service Manual
4.2 Factory Preset Display Modes VESA MODES
Horizontal Vertical
Mode Resolution Total
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA
640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
SVGA
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
800x600@75Hz
1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@60Hz 1312x813 48.78 N 60.00 N 64.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
XGA
1024x768@72Hz 1304x798 57.515 P 72.074 P 75.000
Nominal
Frequenc
y
+/-
0.5kHz
Sync
Polarity
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Nominal
Pixel
Clock
(MHz)
1024x768@75Hz 1328x804 60.200 N 74.90 N 80.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
XGA 1152x864@75Hz 1600x900 67.50 P 75.000 P 108.000
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
SXGA
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
IBM MODES
Horizontal Vertical
Nominal
Nominal
Frequenc
Mode Resolution Total
y
Sync
Polarity
+/-
Nominal
Freq.
+/- 1 Hz
Sync
Polarity
Pixel
Clock
(MHz)
0.5kHz
DOS* 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
DOS** 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175
MAC MODES
VGA
640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA
832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832
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EN7220 Service Manual
4.3 Power Supply Requirements
4.3.1 Input Requirements
INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120KΩX4(ROOM TEMPERATURE 25℃ ±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage
Input current Iin 2250 2500 mA FOR 4 LOAD
Output Current Iout 6.0 6.5 7.0 mA FOR 1 LOAD
Frequency
H.V open
H.V Load
Start voltage Vst
Protect delay time PDT
4.3.2 Output Requirements
INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=120KΩX4(ROOM TEMPERATURE 25℃ ±4℃)
Vin
F 50.0 55.0 60.0 KHZ
Vopen
Vload
10.8 12 13.2 V
1450 1600 1750 Vrms NO LOAD
710 810 910 Vrms RL=120KΩ
1650 1750 1850 Vrms RL=CCFL
0.4 1 4 Sec
FOR 1 LOAD
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage
Input current Iin 660 750 mA FOR 4 LOAD
Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD
Frequency
H.V open
Start voltage Vst
H.V Load
Vin
F 50.0 55.0 60.0 KHZ
Vopen
Vload
10.8 12 13.2 V
1450 1600 1750 Vrms NO LOAD
1650 1750 1850 Vrms RL=CCFL
350 450 550 Vrms RL=120KΩ
FOR 1 LOAD
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EN7220 Service Manual
4.4 Panel Specification (QDI L07)
4.4.1 Display Characteristics
PARAMETER SPECIFICATION UNIT
Display Size 43(17") Diagonal cm
Active area 337.9(H) x 270.3(V) mm
Pixel format
Pixel pitch 0.264(H) x 0.264(V) mm Pixel configuration R, G, B vertical stripe Display mode Normally White
Unit outline dimensions (typ.)*1 358.5 x 296.5x 16.5 mm
weight 1970(Max.) g
Surface treatment
Lamp Quantity
4.4.2 Optical Characteristics
The optical characteristics are measured under stable conditions at 25℃(Room Temperature)：
Parameter Symbol Condition Min Typ. Max. Unit Remark
1280(H) x 1024(V) pixel (1 Pixel=R+G+B dots)
Anti-glare and hard-coating 3H Low reflection (~ 5%)
4 pcs
Horizontal θ21, θ22 65 75 Deg
θ11 55 65 Deg
Vertical
Viewing angle
range
Contrast ratio CR θ=0° 300 450 — Note2, 4
Response time t θ=0° — 20 ms
Rise time tr 4 ms
Fall time td 16 ms
Chromaticity of White(CIE 1931)
Horizontal θ21, θ22 85 Deg
Vertical
θ12
θ11 75 Deg
θ12
Wx 0.283 0.313 0.343
Wy 0.299 0.329 0.359
CR>10
50 60 Deg
CR>5
70 Deg
Note1,4
Note3, 4
Note4
Rx 0.603 0.633 0.663
Chromaticity of Red(CIE 1931)
Ry 0.306 0.336 0.366
hromaticity of Green(CIE 1931) Gx 0.270 0.300 0.330
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Chromaticity of Blue(CIE 1931)
EN7220 Service Manual
Gy 0.556 0.586 0.616
Bx 0.116 0.146 0.176
By 0.073 0.103 0.133
Luminance of white
YL 240 300
Note 4[Note 4]
White Uniformity δw — 1.25 1.33 Note5
Cross talk 1.50% Note6
4.4.3 Parameter Guide for CFL Inverter
The backlight system is an edge-lighting type with 2- CCFL(Cold Cathode Fluorescent Lamp).
The characteristics of four lamps are shown in the following tables.
PARAMETER SYMBOL MIN TYP MAX UNIT REMARK
Lamp current range IL 3.0 7.0 8.0 mArms Note1 Lamp voltage VL 725 Vrms Lamp power consumption PL 5.1 W Note2 IL=7.0mA
cd/㎡
IL=7.0
mArms
Lamp frequency FL 52 kHz Note3
Established starting voltage Vs
1100 Vrms 1420 Vrms
Lamp life time LL 40000 50000 hour Note5
Ta= 25℃ Ta= 0℃
Note4
12
5.2 Software Flow Chart
2
10
12
643
8
9
141113
1516
1719
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EN7220 Service Manual
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5
7
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EN7220 Service Manual
r
1) MCU initialize.
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.
Scaler initialize.
10) In standby mode ?
11) Update the life time of back light.
12) Check the analog port, are there any signals coming ?
13) Does the scalar send out a 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 afte
the message disappear.
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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5.3 Electrical Block Diagram
5.3.1 Main Board
EN7220 Service Manual
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