LG L1511S Schematic

COLOR MONIT OR

SER VICE MANUAL

Website:http://biz.LGservice.com

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

CAUTION

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

CHASSIS NO. : CL-32 F ACTORY MODEL: LB501K

MODEL: L151 1S (LB501K-GL)

*( ) ID LABEL MODEL No.

TO/

S ELECT

CONTENTS

SPECIFICATIONS

- 2 -

1. LCD CHARACTERISTICS

Type : TFT XGA LCD Module Size : 352.0(H) x 263.5(V) x 14.0(T) Pixel Pitch : 0.297mm x 0.297mm Color Depth :

6bits(with FRC)/ 16M colors

Active Video Area : 15.0inch

(304.128 x 228.096) Surface Treatment : Anti-Glare, Hard Coating (3H) Backlight Unit : Top/Bottom edge side 2CCFL Electrical Interface : LVDS interface

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

10 Left : 55° min. Right : 55° min. Top : 40° min. Bottom : 40° min.

2-2. Luminance

200(min.), 250(typ.) at Center point

2-3. Contrast Ratio :250(min.), 350(typ.)

3. SIGNAL (Refer to the Timing Chart)

3-1. Sync Signal

1) Type : Separate Sync. (Horizontal & Vertical)

2) Input Voltage Level: Low=0~0.8V, High=2.1~5.5V

3) Sync Polarity : Positive or Negative

3-2. Video Input Signal

1) Type : R, G, B Analog

2) Voltage Level : 0~0.714 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

Horizontal : 30 ~ 63kHz Vertical : 56 ~ 75Hz

4. POWER SUPPLY

4-1. Power

100~240V, 50/60Hz 0.6A

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.)

Lamp Life : 30,000 Hours (Min.)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 356mm (14.01'') Depth : 151.7mm (5.97'') Height : 359.8mm (14.16'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.0kg (8.82 lbs) Gross Weight : 5.5kg (12.13 lbs)

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

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

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

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

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

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

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

ADJUSTMENT ........................................................ 9

TROUBLESHOOTING GUIDE .............................. 10

PRINTED CIRCUIT BOARD................................... 14

EXPLODED VIEW...................................................15

REPLACEMENT PARTS LIST ...............................17

PIN CONFIGURATION............................................20

SCHEMATIC DIAGRAM ........................................ 22

MODE

POWER ON (MAX)

POWER ON (NORMAL)

STAND-BY

SUSPEND

DPMS OFF

H/V SYNC

ON/ON

ON/ON OFF/ON ON/OFF

POWER CONSUMPTION

less than 30 W less than 28 W

less than 3 W less than 3 W

less than 3 W

LED COLOR

GREEN GREEN AMBER AMBER AMBER

VIDEO ACTIVE ACTIVE

OFF 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 manufacturer 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

H / V

H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines)

Sync

Polarity

– –

– – – – – – – –

+ + + + + + + +

– – – – – –

+ +

Dot

Clock

25.175

28.322

25.175

30.24

31.5

36.0

40.0

50.0

49.5

57.2832

78.75

Frequency

31.468 KHz

70.0 Hz

31.468 KHz

70.0 Hz

31.469 KHz

60.0 Hz

35.00 KHz

66.67 Hz

37.861 KHz

72.8 Hz

37.50 KHz

75.0 Hz

35.156KHz

56.25 Hz

37.879 KHz

60.3 Hz

48.077 KHz

72.188 Hz

46.875 KHz

75.0 Hz

49.725 KHz

74.55 Hz

48.363 KHz

60.0 Hz

56.476 KHz

70.0 Hz

60.023 KHz

75.0 Hz

Resolution

640 x 350

720 x 400

640 x 480

800 x 600

832 x 624

1024 x 768

Total

Period

( E )

800 449 900 449 800 525 864 525 832 520 840 500

1024

625

1056

628

1040

666

1056

625

1152

667

1344

806

1328

806

1312

800

Video

Active

Time ( A )

640 350 720 400 640 480 640 480 640 480 640 480 800 600 800 600 800 600 800 600 832 624

1024

768

1024

768

1024

768

Blanking

Time

( B )

160

180

160

224

192

200

224

256

240

256

320

304

288

Sync

Duration

( D )

108

128

120

136

Back

Porch

( F )

48 60 55 34 48 33 96 39

128

120

128

22 88 23 64 23

160

224

160

144

176

Front

Porch

( C )

16 37 17 13 16 10 64

1 56 37 16

1 32

1 24

3 24

3 16

MODE

(MAC)

(TEXT)

- 5 -

OPERATING INSTRUCTIONS

FRONT VIEW

REAR VIEW

Front Control Panel

1. Power Button

Use this button to turn the display on or off.

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.

2. Menu Button

Use this button to enter or exit the On Screen Display.

3. Button

Use these buttons to choose or adjust items in the On Screen Display.

AUTO/SELECT Button

Use this button to enter a selection in the On Screen Display.

Power Connector

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.

See front control panel

D-Sub Signal Connector

Bring up Contrast and Brightness adjustment.

100

PROCESSING

AUTO CONFIGURATION

1142 3

TO/

ELECT

- 6 -

WIRING DIAGRAM

J706

J702

J705

CN2

CN3

Connector Ass’y : P/N: 6631T11016C

Connector Ass’y : P/N: 6631T20008U

- 7 -

BLOCK DIAGRAM

EEPROM

24LC16

ADC/PLL/Scaler

(GMZAN2)

MICOM

(MTV312)

Schmitt Trigger

(74HCT14A)

Panel

Interface

20 Pin

Connector

RGB

H.V

D-

Sub

15P

E-DDC

Control

SCLK

SDATA

CON

3.3VD

3.3V_PL Module Power 3.3V

3.3V_PL3.3VD

5VR

3.3V_AD

Regulator

BA033

Regulator

BA033

3.3V_A

+3.3V

Regulator

BA033

Hsync2 Vsync2

Hsyncm

Vsyncm

2.5V_A 2.5V_D

Regulator

RC117

+2.5V_A

2.5V_D

5VR

LVDS

Filter

SMPS

5VR

CON 8P

Inverter block

12VS

LIPS

CON 2P

EEPROM

24LC02

24 Bit

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

CON 2P

PWM

Controller

DESCRIPTION OF BLOCK DIAGRAM

- 8 -

1. Scaler One chip IC(GMZAN-2, U201)

GMZAN-2 (U201) is one chip IC which it supports four internal function blocks of Video Amp, PLL, A/D converter and Video processor. Video signal (0.7Vp.p) clamped through C207, 208, 209 with matching IC’s proper cut off voltage. This signal is processed as a proper 8 bit digital signal by U201’s amplifying, phase locking, A/D converting,

and scaling operations. U201 outputs 24bit RGB data and control signals(Clock, Horizontal and Vertical sync, and Data Enable) as LVDS IC’s input signals.

2. System Controller (Microprocessor) Circuit

1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input

from signal source.

2) Microprocessor (U501) carries out power control by sending power-down trigger signal to each IC.

3) Microprocessor (U501) communicates with EEPROM (U502), and GMZAN-2 (U201)

through IIC(2 lines) or 4 bit bus line. It makes all devices operated properly.

4) Microprocessor (U501) let User adjust screen by OSD function.

3. LVDS(Low Voltage Differential Signal, U411)

LVDS transmitter (U411) delivers digital signal to the receiver inside LCD module by method of abstraction. The abstracted signals are pairs of RIN0+-, RIN1+-, RIN2+-, RIN3+-, and RCLKIN+- of which voltage swing is 0.5V each. When SHUTON pin’s input is High, transmitter goes to power down mode.

4. DC/DC block

This block is composed of regulators which supplies 2.5V and 3.3V. Each regulator’s source power is 5VR from LIPS(LCD Inverter and Power Supply) block. U806 supplies 2.5VD and 2.5VA and U802 supplies 3.3VD, 3.3V_AD, and 3.3V_PL powers to GMZAN-2’s internal PLL, ADC, Pre-amp, and scaler by dropping down 5VR. U805 supplies MODPWR-3.3V for LCD module’s operation by dropping down 5VR.

5. LIPS Block (LCD Inverter and Power Supply)

This block supplies DC voltages of 5VS to interface board and 12V to inverter by converting AC input voltage of 100~240Vac. Converting method is SMPS(Switching Mode Power Supply). Inverter on/off signal from microprocessor makes inverter turned on or off . DIMADJ signal from microprocessor does inverter’s current adjustment for Brightness control.

- 9 -

ADJUSTMENT

All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several minor adjustment may be required. Adjustment should be following procedure and after warming up for a minimum of 10 minutes. Alignment appliances and tools.

- IBM Compatible PC

- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)

- E(E)PROM with each mode data saved.

- Alignment Adapter and Software.

1. Adjustment for Factory Preset Mode

1) Run alignment program for LB501K on the IBM compatible PC.

2) Select EEPROM All Init. command and Enter.

3) Display cross hatch pattern at Mode 1.

4) Select EDID WRITE command and Enter.

2. Adjustment for White Balance

1) Display color 0,0 pattern at Mode 13.

2) Set External Bright to MAX position and Contrast to MAX Position.

3) Select PRESET START → BIAS CAL command and Enter.

4) No attempt to manually adjust, BIAS data is automatically adjusted and saved to the EEPROM.

5) Display color 15,0 pattern at Mode 13.

6) Select DRIVE CAL command and Enter.

7) Color 1 (9300K) and Color 2 (6500K) are automatically adjusted and saved to the EEPROM.

8) Select PRESET EXIT command and Enter.

Figure 1. Cable Connection

220

IBM Compatible PC

PARALLEL PORT

Power inlet (required)

Power LED

ST Switch

Power Select Switch (110V/220V)

Control Line

Not used

RS232C

PARALLEL

V-SYNC

POWER

VGS

MONITOR

V-Sync On/Off Switch (Switch must be ON.)

4.7K

74LS06

OFF ON

OFF

Video Signal Generator

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