LG Flatron L1720B

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COLOR MONITOR SERVICE MANUALCHASSIS NO. : CL-43

MODEL:CAUTION

L1720B (L1720BL-AL**R)

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTSSPECIFICATIONS ................................................... 2 PRECAUTIONS ....................................................... 3 TIMING CHART ....................................................... 4 OPERATING INSTRUCTIONS ................................ 5 WIRING DIAGRAM ................................................. 6 BLOCK DIAGRAM ................................................... 7 DESCRIPTION OF BLOCK DIAGRAM.....................8 ADJUSTMENT ...................................................... 10 TROUBLESHOOTING GUIDE .............................. 11 PRINTED CIRCUIT BOARD................................... 15 EXPLODED VIEW...................................................17 REPLACEMENT PARTS LIST ...............................19 SCHEMATIC DIAGRAM ......................................... 22

SPECIFICATIONS1. LCD CHARACTERISTICS Type : TFT SXGA LCD Size : 17 inch Pixel Pitch : 0.264 (H) x 0.264 (V) Color Depth : 16.2M colors Electrical Interface : LVDS Surface Treatment : Hard-coating(3H) Operating Mode : Normally White Backlight Unit : Top/Bottom edge side 4-CCFL (Cold Cathode Fluorescent Lamp) 2. OPTICAL CHARACTERISTICS 2-1. Viewing Angle by Contrast Ratio 10 Left : -60 min., -70(Typ) Right : +60 min., +70(Typ) Top :+50 min., +60(Typ) Bottom : -45min., -60(Typ) 2-2. Luminance 2-3. Contrast Ratio : 200(min), 250(Typ) : 300(min), 400(Typ) 4. Max. Resolution Analog 5. POWER SUPPLY 5-1. Power : AC 100-240V~, 50/60Hz , 1.0A 5-2. Power ConsumptionMODE POWER ON (NORMAL) STAND-BY SUSPEND DPMS OFF H/V SYNC VIDEO POWER CONSUMPTION LED COLOR ON/ON OFF/ON ON/OFF OFF/OFF ACTIVE OFF OFF OFF

: 1280 x 1024 / 75Hz

less than 40 W less than 2 W less than 2 W less than 2 W

BLUE AMBER AMBER AMBER

6. ENVIRONMENT 6-1. Operating Temperature: 10C~35C (50F~95F) (Ambient) 6-2. Relative Humidity : 10%~80% (Non-condensing) 6-3. MTBF : 50,000 Hours(Min) 7. DIMENSIONS (with TILT/SWIVEL) FullUp Position Width : 394 mm (15.51'') Depth : 232 mm (9.13'') Height : 379 mm (14.92'') Folded Position Width Depth Height : 394mm (15.51'') : 127mm (9.13'') : 412mm (14.92'')

3. SIGNAL (Refer to the Timing Chart) 3-1. Sync Signal Type : Separate Sync, SOG (Sync On Green) Composite Sync 3-2. Video Input Signal 1) Type 2) Voltage Level a) Color 0, 0 b) Color 7, 0 c) Color 15, 0 3) Input Impedance : R, G, B Analog : 0~0.71 V : 0 Vp-p : 0.467 Vp-p : 0.714 Vp-p : 75

3-3. Operating Frequency Horizontal : 30 ~ 83kHz Vertical : 56 ~ 75Hz

8. WEIGHT (with TILT/SWIVEL) Net. Weight Gross Weight : 4.5 kg (9.92 lbs) : 7.6 kg (16.76 lbs)

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PRECAUTIONWARNING FOR THE SAFETY-RELATED COMPONENT. There are some special components used in LCD monitor that are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturers specified parts to prevent electric shock, fire or other hazard. Do not modify original design without obtaining written permission from manufacturer or you will void the original parts and labor guarantee.

WARNINGBE CAREFUL ELECTRIC SHOCK ! If you want to replace with the new backlight (CCFL) or inverter circuit, must disconnect the AC adapter because high voltage appears at inverter circuit about 650Vrms. Handle with care wires or connectors of the inverter circuit. If the wires are pressed cause short and may burn or take fire.

TAKE CARE DURING HANDLING THE LCD MODULE WITH BACKLIGHT UNIT. Must mount the module using mounting holes arranged in four corners. Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen. Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel. Protect the module from the ESD as it may damage the electronic circuit (C-MOS). Make certain that treatment persons body are grounded through wrist band. Do not leave the module in high temperature and in areas of high humidity for a long time. The module not be exposed to the direct sunlight. Avoid contact with water as it may a short circuit within the module. If the surface of panel become dirty, please wipe it off with a softmaterial. (Cleaning with a dirty or rough cloth may damage the panel.)

CAUTIONPlease use only a plastic screwdriver to protect yourself from shock hazard during service operation.

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TIMING CHART

VIDEO

B

A

C

E D F

SYNC

> ModeH/V SortSync Polarity

Dot Clock

Frequency

Total Period Video Active Time (E) (A)

Front Porch (C)

Sync Duration (D)

Back Porch (F)

Resolution

1 2 3 4 5 6 7 8 9 10 11 12 13

H V H V H V H V H V H V H V H V H V H V H V H V H V

+ + + + + + +/ +/ +/ +/ +/ +/ + + + +

25.175 28.321 25.175 31.5 40.0 49.5 57.283 65.0 78.75 100.0 92.978 108.0 135.0

31.469 70.8Hz 31.468 70.09 31.469 59.94 37.5 75 37.879 60.317 46.875 75.0 49.725 74.55 48.363 60.0 60.123 75.029 68.681 75.062 61.805 65.96 63.981 60.02 79.976 75.035

800 449 900 449 840 525 840 500 1056 628 1056 625 1152 667 1344 806 1312 800 1456 915 1504 937 1688 1066 1688 1066

640 350 720 400 640 480 640 480 800 600 800 600 832 624 1024 768 1024 768 1152 870 1152 900 1280 1024 1280 1024

16 37 18 12 16 10 16 1 40 1 16 1 32 1 24 3 16 1 32 3 18 2 48 1 16 1

96 2 108 2 96 2 64 3 128 4 80 3 64 3 136 6 96 3 128 3 134 4 112 3 144 3

48 60 54 35 48 33 120 16 88 23 160 21 224 39 160 29 176 28 144 39 200 31 248 38 248 38

640x350 70Hz 720x400 70Hz 640x480 60Hz 640x480 75Hz 800x600 60Hz 800x600 75Hz 832x624 75Hz 1024x768 60Hz 1024x768 75Hz 1152x870 75Hz 1152x900 65Hz 1280x1024 60Hz 1280x1024 75Hz

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OPERATING INSTRUCTIONSFRONT VIEW REAR VIEW

D-sub Connect Power Connect

See front control panel

Front Control Panel

3

2

4

1

1. Power Button Use this button to turn the display on or off. This Indicator lights up blue when the display operates normally. If the display is in DPM (Energy Saving) mode, this indicator color changes to amber. 2. Button Use these buttons to choose or adjust items in the On Screen Display.This function optimizes the brightness, contrast or color value to the surrounding conditions and settings and enables you to enjoy the most suitable picture by adjusting the surroundings (DAY/NIGHT/USER MODE). TEXT: For viewing letters MOVIE: For viewing movies PHOTO: For viewing pictures or the photographs USER MODE: This function memorizes the manual adjustment -Brightness, Contrast and Color value on the On Screen Display.100 100

3. Menu Button Use this button to enter or exit the On Screen Display. 4. AUTO/SELECT Button Use this button to enter a selection in the On Screen Display.

When adjusting your display settings, always press the AUTO/SELECT button before entering the On Screen Display(OSD). This will automatically adjust your display image to the ideal settings for the current screen resolution size (display mode). The best display mode is 1024x768/60Hz.

Bring up Contrast and Brightness adjustment. :

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Connector Assy : P/N: 6631T11016C

J702 J707 CN4 CN5

Connector Assy : P/N: 6631T20023A

Connector Assy : P/N: 6631T20024C

CN1 CN3 CN2

Connector Assy : P/N: 6631T20008G

5V

LCD Module

5V

5V

R,G,B differential

LVDS (Low Voltage Differential Signaling)

3.3V Reg.3.3V

2.5V Reg.5V 2.5V 2.5V

MST9111 including(ADC/LVDS/SCALER )

MTV312 Micom

3.3V

5V

AC Input

LIPS

R,G,B, H/V Sync

D-SUB

DESCRIPTION OF BLOCK DIAGRAM1. Video Controller Part & Display Data Transmitter Part.(MST9111) This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 135MHz. This part consists of the Scaler. The Scaler gets the video signal converted analog to digital, interpolates input to 1280 x 1024 resolution signal and outputs 8-bit R, G, B signal to transmitter. Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip MST9111 by MSTAR. This part transmit digital signal from the Scaler to the receiver of module. 2. Micom Part This Part consists of EEPROM IC which stores control data, Reset IC and the Micom. The Micom distinguishes polarity and frequency of the H/V Sync are supplied from signal cable. The controlled data of each modes is stored in EEPROM. 3. Power Part This part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 5V in LIPS Board. 5V is provided for LCD Panel. Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.

LIPS Board Block Diagram

12V50 ~ 60Hz HVDC 100KHz

EMI COMPONENTS

INPUT RECTIFIER AND FILTER

ENERGY TRANSFER

OUTPUT RECTIFIER AND FILTER

5V GND

LINE 100 ~ 240V

PWM CONTROL CIRCUIT

PHOTOCOUPLER ISOLATION

SIGNAL COLLECTI ON

PRIMARY

SECONDARY

Operation description_LIPS1. EMI components. This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse. 2. Input r