LG L180P Schematic

COLOR MONITOR

SERVICE MANUAL

CAUTION

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

MODEL: L180p(9180-HB9)

Chassis No. : CL-42

1. LCD CHARACTERISTICS

Type : TFT SXGA LCD Size : 18.1inch(459.74mm) Pixel Pitch : 0.2805(H) x 0.2805(V) Color Depth : 8-bit, 16,777,216 colors Electrical Interface : LVDS Surface Treatment : Anti-Glare, Hard Coating (3H) Operating Mode : Normally Black Backlight Unit : Six-CCFL (Cold Cathode

Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

Left : -60° min., -85°(typ) Right : +60° min., +85°(typ) Top : +60° min., +85°(typ) Bottom : -60° min., -85°(typ)

2-2. Luminance : 200(min), 250(typ) 2-3. Contrast Ratio : 250(min), 400(typ)

3. SIGNAL (Refer to the Timing Chart)

3-1. Sync Signal

• Type : Separate, Composite, SOG (Sync On Green) Digital

3-2. Video Input Signal

1) Type : R, G, B Analog

2) Voltage Level : 0~0.71 V

a) Color 0, 0 : 0 Vp-p b) Color 7, 0 : 0.467 Vp-p c) Color 15, 0 : 0.714 Vp-p

3) Input Impedance : 75 Ω

3-3. Operating Frequency

Analog

Horizontal : 31 ~ 81kHz Vertical : 55 ~ 75Hz

Digital

Horizontal : 31 ~ 68kHz Vertical : 55 ~ 75Hz

4. POWER SUPPLY

4-1. Power Adaptor

Input : AC 90~240V, 50/60 ±3Hz , 1.0A

4-2. Power Consumption

5. ENVIRONMENT

5-1. Operating Temperature: 10°C~35°C (50°F~95°F)

(Ambient)

5-2. Relative Humidity : 10%~80%

(Non-condensing)

5-3. MTBF : 50,000 Hours(Min)

6. DIMENSIONS

Without Tilt/Swivel

Width : 396.0 mm (15.59'') Depth : 71.1 mm ( 2.79'') Height : 330.5 mm (13.01'')

With Tilt/Swivel

Width : 396.0 mm (15.59'') Depth : 259.0 mm (10.19'') Height : 349.7 mm (13.7'')

7. WEIGHT

Without Stand : 5.3kg (11.69 lbs) With Stand : 7.7kg (16.98 lbs)

CONTENTS

SPECIFICATIONS

- 2 -

SPECIFICATIONS ................................................... 2

PRECAUTIONS ....................................................... 3

TIMING CHART ....................................................... 4

OPERATING INSTRUCTIONS ................................ 5

WIRING DIAGRAM ................................................. 6

BLOCK DIAGRAM ................................................... 7

DESCRIPTION OF BLOCK DIAGRAM.....................8

ADJUSTMENT ...................................................... 10

TROUBLESHOOTING GUIDE .............................. 12

EXPLODED VIEW...................................................16

EXPLODED VIEW PARTS LIST..............................17

REPLACEMENT PARTS LIST ...............................18

PIN CONFIGURATION............................................21

SCHEMATIC DIAGRAM......................................... 23

MODE

POWER ON (MAX)

ACITIVE OFF POWER OFF

H/V SYNC

ON/ON

OFF/OFF

POWER CONSUMPTION

less than 55 W

less than 3 W less than 3 W

LED COLOR

GREEN AMBER

OFF

VIDEO

ACTIVE

OFF

- 3 -

WARNING 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 manufacturer’s specified parts to prevent electric shock, fire or other hazard.

• Do not modify original design without obtaining written permission from IBM or you will void the original parts and labor guarantee.

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 person’s 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.)

WARNING

BE 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.

PRECAUTION

CAUTION

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

TIMING CHART

- 4 -

VIDEO

SYNC

<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>

H + 31.469 800 640 16 96 48 V – 70.09 449 350 37 2 60

H + 37.879 1056 800 40 128 88 V + 60.317 628 600 1 4 23

H – 31.469 800 640 16 96 48 V – 59.94 525 480 10 2 33 H – 37.5 840 640 16 64 120 V – 75 500 480 1 3 16

H – 31.468 900 720 18 108 54 V + 70.08 449 400 12 2 35

H + 46.875 1056 800 16 80 160 V + 75.0 625 600 1 3 21 H+/– 49.725 1152 832 32 64 224 V+/– 74.55 667 624 1 3 39 H – 48.363 1344 1024 24 136 160 V – 60.0 806 768 3 6 29 H – 60.123 1312 1024 16 96 176 V – 75.029 800 768 1 3 28 H+/– 68.681 1456 1152 64 128 144 V+/– 75.062 915 870 1 3 39 H+/– 61.805 1504 1152 18 134 200 V+/– 65.96 937 900 2 4 31 H + 63.981 1688 1280 48 112 248 V + 60.02 1066 1024 1 3 38 H + 79.976 1688 1280 16 144 248 V + 75.035 1066 1024 1 3 38

Mode

H/V

Sort

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

640x350

70Hz

800x600

60Hz

640x480

60Hz

640x480

75Hz

720x400

70Hz

800x600

75Hz

832x624

75Hz

1024x768

60Hz

1024x768

75Hz

1152x870

75Hz

1152x900

65Hz

1280x1024

60Hz

1280x1024

75Hz

Sync

Polarity

Frequency

Dot

Clock

Total Period

(E)

Video Active Time

(A)

Sync Duration

(D)

Back Porch

(F)

Front Porch

(C)

Resolution

OPERATING INSTRUCTIONS

- 5 -

FRONT VIEW REAR VIEW

Front Control Panel

Power Connect

AUDIO DC OUT

USER CONTROL FEATURES

Icon Direct Access Functions

Switches the monitors on and off.

Bring up Brightness adjustment.

Executes automatic image setup.

Switch between input signals.

Icon Monitor controls

and

Display main OSD menu and selects highlighted menu item.

Moved the cursor to highlight icons or make adjustments.

Exits from current OSD menu.

CONTROLS LOCK / UNLOCK

This feature allows you to secure the current control settings, while allowing the user to adjust Brightness, so that they cannot be inadvertently changed. Push and hold the enter button[ ] for 10 seconds; the message “Menu is Locked” appears.

You can unlock the OSD controls at any time by pushing the enter button[ ] for 10 seconds; the message “Menu is Unlocked” will appear.

J705

J702

- 6 -

WIRING DIAGRAM

Connector Ass’y P/N:

6631T20022E

Connector Ass’y P/N:

6631T11016D

- 7 -

BLOCK DIAGRAM

LVDS

(Low Voltage

Differential

Signaling)

Micom

MTV412

DVI-I

Digital Signal or

Analog R,G,B,H/V

LCD Module

Inverter Output

Inverter

12V

R,G,B

differential

2.5V

3.3V

Reg.

including

MST9151B

/INPUT SWITCHING

(ADC/LVDS/SCALER

2.5V

3.3V

12V

/TMDS )

Power

R,G,B, H/V Sync

D-SUB

AC Input

- 8 -

DESCRIPTION OF BLOCK DIAGRAM

1. Video Controller Part & Display Data Transmitter Part.(MST9151B)

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"MST9151B" 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. Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for Scaler IC in the main board.

12V is provided for LCD Panel.

4. Inverter

The inverter converts from DC12V to AC 700Vrms and operates back-light lamps of module.

- 9 -

50 ~ 60Hz

Operation description_Power

1. 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 rectifier and filter.

This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.

3. Energy Transfer.

This part function is transfer the primary energy to secondary through a power transformer.

4. Output rectifier and filter.

This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also the over power protection is also monitor by this part.

5. Photo-Coupler isolation.

This part function is to feed back the dc output changing status through a photo transistor to primary controller to achieve the stabilized dc output voltage.

6. Signal collection.

This part function is to collect the any change from the dc output and feed back to the primary through photo transistor

LINE

100 ~ 240V

EMI

COMPONENTS

INPUT RECTIFIER

AND FILTER

HVDC

ENERGY

TRANSFER

100KHz

OUTPUT RECTIFIER

AND FILTER

12V

GND

PWM CONTROL

CIRCUIT

PHOTO

ISOLATION

-COUPLER

SIGNAL

COLLECT-

ION

PRIMARY SECONDARY

12V

INVERTER CIRCUIT

High Voltage output

+ 19 hidden pages