LG Flatron L172WT_LCD Monitor Service Manual

Embed Size (px)

Text of LG Flatron L172WT_LCD Monitor Service Manual

Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html

COLOR MONITOR SERVICE MANUALCHASSIS NO. : CL-56

MODEL:(

L172WT (L172WAL-AL**T)) **Same model for Service

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

CONTENTSSPECIFICATIONS ................................................... 2 PRECAUTIONS ....................................................... 4 TIMING CHART ....................................................... 5 OPERATING INSTRUCTIONS ................................ 6 DISASSEMBLY ..................................................... 10 BLOCK DIAGRAM ................................................. 11 DESCRIPTION OF BLOCK DIAGRAM...................12 ADJUSTMENT ...................................................... 13 TROUBLESHOOTING GUIDE .............................. 16 WIRING DIAGRAM ............................................... 23 EXPLODED VIEW...................................................24 REPLACEMENT PARTS LIST ...............................26 PIN CONFIGURATION............................................33 SCHEMATIC DIAGRAM ......................................... 35

SPECIFICATIONS1. LCD CHARACTERISTICS Type : TFT Color LCD Module Size : 17.1inch Pixel Pitch : 0.291mm x 0.291mm Color Depth : 8-bit, 16,777,216 colors Electrical Interface : LVDS Size : 258.0(V) x 400(H) x 22.0(D) Surface Treatment : Anti-Glare, Hard Coating(3H) Operating Mode : Normally Black, Transmissive Backlight Unit : 6-CCFL (Cold Cathode Fluorescent Lamp) 2. SPECIAL FUNCTION 2-1. Auio AMP 1)Output Rated Output 2)Freq. Character 3)Input 2-2. SPEAKER 1) Impedance 2) Input 2-3. TV 1) Type 2) Tuner IF 4. OPTICAL CHARACTERISTICS 4-1. Viewing Angle by Contrast Ratio Left : -85 min., -88(Typ) Right : +85 min., +88(Typ) Top : +85 min., +88(Typ) Bottom : -85 min., -88(Typ) 4-2. Luminance 4-3. Contrast Ratio

10

: 320(min), 370(Typ) -9300K 300cd/m2(min) -6500K : 300(min), 400(Typ)

: 3Wrms + 3Wrms : 2.7W(Min) : 13.1Vpp(4.65Vrms) : 100Hz~10KHz Range(-3dB) : PC - 0.7 0.1Vrms AV - 0.4 0.1Vrms :8 : Max-5W, Normal-3W

5. RESOLUTION SXGA : 1280 x 1024 @ 60Hz WXGA : 1280 x 768 @ 60Hz 6. POWER SUPPLY 6-1. Power Adaptor Input : AC 100-240V~, 50/60Hz , 1.1A 6-2. Power ConsumptionMODE POWER ON (NORMAL) STAND-BY H/V SYNC VIDEO POWER CONSUMPTION LED COLOR ON/ON OFF/ON ON/OFF OFF/OFF ACTIVE OFF OFF OFF

less than 70 W less than 5 W less than 5 W less than 5 W

GREEN AMBER AMBER AMBER

: NTSC : PIF - 45.75MHz SIF - 41.25MHz CIF - 42.17MHz 3) Receiving Channel : VHF- Low: 55.25~127.25MHz HIGH: 133.25~361.25MHz UHF - 367.25~801.25MHz 2-4. AV 1) Video Level : Input - 0.7 0.15Vp-p 2) Sync Level : Input - 0.286 0.075Vp-p 3) Color Burst : Input - 0.214 0.072Vp-p 4) Audio Level : AV Input - 0.4 0.1Vrms PC Input - 0.7 0.1Vrms 5) Video Cross Talk : 43dB

SUSPEND POWER OFF

7. ENVIRONMENT 7-1. Operating Temperature: 10C~35C (50F~95F) 7-2. Operating Humidity 7-3. MTBF : 10%~80%

: 50,000 Hours(Typ.)

8. DIMENSIONS (with TILT/SWIVEL) Width Height Depth : 505.5 mm (19.90'') : 365 mm (14.37'') : 231.5 mm (9.11'')

3. SIGNAL 3-1. Operating Frequency Horizontal : 30 ~ 66kHz(Digital: 30~63kHz) Vertical : 56 ~ 85Hz 3-2. Sync : Separate, Composite SOG, Digital

9. WEIGHT (with TILT/SWIVEL) Net. Weight Gross Weight : 6.6kg (14.55 lbs) : 10.0kg (22.05 lbs)

-2-

Signal Connector Pin Assignment DVI-D Connector (Digital) Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Signal (DVI-D)T. M. D. S. Data2T. M. D. S. Data2+ T. M. D. S. Data2/4 Shield T. M. D. S. Data4T. M. D. S. Data4+ DDC Clock DDC Data Analog Vertical Sync. T. M. D. S. Data1T. M. D. S. Data1+ T. M. D. S. Data1/3 Shield T. M. D. S. Data3T. M. D. S. Data3+ +5V Power Ground (return for +5V,H. Sync. and V. Sync.)

1 9 17

8 16 24

Pin 16 17 18 19 20 21 22 23 24

Signal (DVI-D)Hot Plug Detect T. M. D. S. Data0T. M. D. S. Data0+ T. M. D. S. Data0/5 Shield T. M. D. S. Data5T. M. D. S. Data5+ T. M. D. S. Clock Shield T. M. D. S. Clock+ T. M. D. S. Clock-

T. M. D. S. (Transition Minimized Differential Signaling)

-3-

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.

-4-

TIMING CHARTVIDEO

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 36.0 40.0 49.5 56.25 57.283 65.0 78.75 108.0 80.14

31.469 70.8 31.468 70.8 31.469 59.94 37.5 75 43.269 85.0 37.879 60.317 46.875 75.0 53.674 85.061 49.725 74.55 48.363 60.0 60.123 75.029 63.981 60.02 47.7 60

800 449 900 449 800 525 840 500 832 509 1056 628 1056 625 1048 631 1152 667 1344 806 1312 800 1688 1066 1680 795

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

16 37 18 12 16 10 16 1 56 1 40 1 16 1 32 1 32 1 24 3 16 1 48 1 66 1

96 2 108 2 96 2 64 3 56 3 128 4 80 3 64 3 64 3 136 6 96 3 112 3 134 3

48 60 54 35 48 33 120 16 80 25 88 23 160 21 152 27 224 39 160 29 176 28 248 38 200 23

640x350 70Hz 720x400 70Hz 640x480 60Hz 640x480 75Hz 640x480 85Hz 800x600 60Hz 800x600 75Hz 800x600 85Hz 832x624 75Hz 1024x768 60Hz 1024x768 75Hz 1280x1024 60Hz 1280x768 60Hz

-5-

OPERATING INSTRUCTIONSFRONT VIEW REAR VIEW

AV(CVBS) Input Terminal(Audio)

AV(CVBS) Input Terminal(Video)S-Video

S-Video Input Terminal

MIC.In

Headphone/Earphone Connection Terminal Microphone Connection Terminal

Front Control Panel(P6)

REAR VIEW CONNECTOR PANEL

Back CapAudio In MIC.OutAudio L R Y Pb

DVI-I

Pr

S-Video

MIC.In

Theft prevention locking device

1. DVI Digital Signal Connector (DVI-D or DVI-A) 2. TV Tuner Jack: Connect the antenna. 3. Connect the power cord. 4. Connent to the jack in the PC sound card 5. HDTV Input Terminal

DVI-I DVI-I

Audio In Audio In MIC.Out MIC.Out

Audio Audio L R L R Y Pb Y Pb

Pr Pr

1 3

4

5

2

S-Video S-Video

MIC.In MIC.In

-6-

OPERATING INSTRUCTIONSFront Control Panel

3

4

6

1

2

5

7

1 2 3 4

Power LED Power Button MENU Button OSD Select/Adjust Button

This Indicator lights up green when the display operates normally. If the display is in DPM (Energy Saving) mode, this indicator color changes to amber. Press the button to turn on the power. Press the button again to turn it off. Use this button to show/hide the OSD (On Screen Display) menu screen. Use the button to select an icon or adjust the setting in the OSD screen. Use this button to directly control brightness and contrast of the PC signal (DVI-D/DVI-A). Use this button to control the channel for the TV signal. Adjust the volume.

5

AUTO/SELECT Button

[For DVI-ANALOG signal] Select the icon to adjust on the OSD screen. If you press the [AUTO/SELECT] button, automatic screen adjustment will be started.

[Other signals that DVI-ANALOG] The current signal and mode information will be displayed.

6

SOURCE Button

SOURCE

AUTO/SELECT

Select the input signal DVI DIGITAL DVI digital signal DVI ANALOG DVI analog signal VIDEO1(CVBS) Composite video VIDEO2(S-Video) S-Video HDTV(Y, Pb, Pr) HD television TV Television

DVI

7

The unit that receives the signal from the remote controller.

OSD Lock/Unlock Button Menu button +Use this button to lock/unlock OSD screen adjustment. (Activated when pressed together longer than 5 seconds.) Under the CAPTION & VCHIP menu, it is also possible to