LG Flatron E1908s Service Manual
Copyright © 2010 LG Electronics. Inc. All right reserved. - 1 - LGE Internal Use Only
Only for training and service purposes
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COLOR MONITOR
SERVICE MANUAL
MODEL: E1908s (E1908s-PNT.A**DAS for
LCM190A1L0G
) **Sales Market
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the Realtek Chip.
Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only
Only for training and service purposes
CONTENTS
SPECIFICATIONS ..........................................................2
PRECAUTIONS ..............................................................3
TIMING CHART ..............................................................7
DISASSEMBLY ...............................................................8
BLOCK DIAGRAM.........................................................11
DISCRIPTION OF BLOCK DIAGRAM ......................... 13
ADJUSTMENT ............................................................. 14
SERVICE MODE ......................................................... 16
TROUBLESHOOTING GUIDE .................................... 17
WIRING DIAGRAM ...................................................... 23
EXPLODED VIEW........................................................ 24
SCHEMATIC DIAGRAM............................................... 26
SPECIFICATIONS
1. LCD CHARACTERISTICS
Type: Flat Panel Active matrix-TFT LCD
Active Display Area: 19 inches
Pixel Pitch: 0.2835 (H) x 0.2835 (V) mm
Color Depth: 16.7M colors
Size: 278(V) × 428 (H) × 11.6(D) (Typ.)
Interface: 2-channel LVDS
Surface Treatment: Anti-Glare (Haze25),
Hard coating (3H)
Operating Mode: Normally White
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
θ
x
+
/θx-: 75(Min), 75(Typ)
θ
Y
+
/θY-: 70(Min), 80(Typ)
2-2. Center Luminance of White: 200Cd / m
2
2-3. Contrast Ratio:
700(min), 1000(Typ)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
Type: Separate Sync.
3-2. Video Input Signal
1) Type: R, G, B Analog, Digital
2) Voltage Level: 0.7 Vp-p
3) Input impedance: 75 Ω
3-3. Operating Frequency
Ho Horizontal: 30 ~ 83 kHz
Vertical: 56 ~ 75Hz
4. Max. Resolution
D-sub Analog: VESA 1440x 900 @ 75 Hz
5. POWER SUPPLY
5-1. Power: AC 100-240V~50/60Hz
5-2. Power Consumption
On Mode: 26 W (Typ.)
Sleep Mode: ≤ 0.5 W
Off Mode: ≤ 0.5 W
6. ENVIRONMENT
6-1. Operating
Temperature: 10°C to 35°C
Humidity: 10 % to 80% non-Condensing
6-2. Storage
Temperature: -20°C to 60 °C
Humidity: 5 % to 90 % non-Condensing
7. DIMENSIONS (with Stand)
Width: 43.86 cm (17.27 inches)
Depth: 18.00 cm (7.09 inches)
Height: 36.25 cm (14.27 inches)
8. WEIGHT (excl. packing)
Weight: 3.10 kg (6.82 lb)
Copyright © 2010 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only
Only for training and service purposes
Copyright © 2010 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only
Only for training and service purposes
Copyright © 2010 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only
Only for training and service purposes
Copyright © 2010 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only
Only for training and service purposes
Copyright © 2010 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only
Only for training and service purposes
TIMING CHART
Display Modes (Resolution) Horizontal Freq. (kHz) Vertical Freq. (Hz)
1 640 x 480 31.469 59.940
2 640 x 480 37.500 75.000
3 800 x 600 37.879 60.317
4 800 x 600 46.875 75.000
5 1024 x 768 48.363 60.004
6 1024 x 768 56.476 70.069
7 1024 x 768 60.023 75.029
8 1280 x 1024 63.981 60.020
9 1280 x 1024 79.976 75.025
10 1440 x 900 55.935 59.887
Copyright © 2010 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only
Only for training and service purposes
DISASSEMBLY-Set
#1
Put the monitor on a soft flat and unscrew the screw
to remove the stand and the base.
#2
Use tool to open all latches.
#3
Put the front face down, disassemble back cover.
#4
Pull the key board out of bezel.
#5
Disassemble the LVDS cable and tear the aluminum
foils.
#6
Unscrew the 6 screws to remove the main board,
the power board and the adapter board.
Copyright © 2010 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only
Only for training and service purposes
#7
The mainframe.
#8
Disconnect the marked cables from the boards.
#9
Unscrew the 4 screws to remove the bezel.
#10
The panel.
Copyright © 2010 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only
Only for training and service purposes
DISASSEMBLY-Stand
#1
Press the release button.
#2
Consequently, pull the base directly.
#3
The stand.
#4
Directly remove the stand cover by hand.
#5
Unscrew the 3 screws to remove the hinge and the
stand.
#6
Stand cover, stand and hinge.
Copyright © 2010 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only
Only for training and service purposes
BLOCK DIAGRAM
MAIN BOARD
U401
DDC-DSUB PORT
SCALAR RTD2271-GR
Crystal X401
14.31818MHZ
CN402 to Keyboard
A
/D input control
M24C16-WMN6TP
U402
CN406 to Panel
LVDS output
Panel Power
sequence
control circuit
Block Q705
Q706
Power input
CN701
LDO
U701
CAPACITOR
U703
3.3V 1.2V
DSUB
CN101
EEPROM
U101
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