LG LM505J, L1510M Schematic

COLOR MONIT OR

SER VICE MANUAL

CAUTION

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

CHASSIS NO. : CL-38 F ACTORY MODEL: LM505J

MODEL: L1510M (LM505J-GL)

*( ) ID LABEL MODEL No.

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 : 8Bits/ 16M colors Active Video Area : 15.0 inch

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

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

10 Left : 60° min. Right : 60° min. Top : 45° min. Bottom : 45° 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 : 31 ~ 63kHz(Automatic) Vertical : 56 ~ 75Hz(Automatic)

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 : 360.0mm (14.17'') Depth : 153.0mm (6.02'') Height : 359.8mm (14.16'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.15kg (9.15 lbs) Gross Weight : 5.5kg (12.13 lbs)

8. Audio

RMS Audio Output : 1W + 1W(R+L) Input Sensitivity : 0.7Vrms Speaker Impedance : 4

Ω

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

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

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

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

WIRING DIAGRAM ................................................. 7

BLOCK DIAGRAM ................................................... 8

DESCRIPTION OF BLOCK DIAGRAM.................... 9

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

TROUBLESHOOTING GUIDE .............................. 11

PRINTED CIRCUIT BOARD................................... 15

EXPLODED VIEW...................................................17

REPLACEMENT PARTS LIST ...............................19

PIN CONFIGURATION............................................23

SCHEMATIC DIAGRAM ........................................ 28

MODE

POWER ON (NORMAL)

STAND-BY

SUSPEND

DPMS OFF

H/V SYNC

ON/ON OFF/ON ON/OFF

OFF/OFF

POWER CONSUMPTION

less than 30 W

less than 3 W less than 3 W

less than 3 W

LED COLOR

GREEN AMBER AMBER AMBER

VIDEO

ACTIVE

OFF OFF OFF

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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

35.0 KHz

66.67 Hz

37.861 KHz

72.8 Hz

37.50 KHz 75 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 -

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.

Volume:

Use these buttons to decrease or increase the volume level

4. AUTO/

SELECT Button

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

Power Connector

See front control panel

D-Sub Signal Connector

5 6 2 3 4 1

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.

PROCESSING

AUTO CONFIGURATION

OPERATING INSTRUCTIONS

HEAD PHONE

AUDIO IN

5. LIGHT VIEW

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)

6. MUTE

Used to select mute on (means sound off) and mute off (means sound on).

※ CONTROLS LOCKED/UNLOCKED

MENU and Button for 3 seconds

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

OPERATING INSTRUCTIONS

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Front Control Panel

• 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.

LIGHT VIEW

DAY

NIGHT

USER MODE

TEXT

MOVIE

PHOTO TEXT MOVIE PHOTO

This function allows you to secure the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button and button for 3 seconds: the message

“CONTROLS LOCKED”

appears.

You can unlock the OSD controls at any time by pushing the MENU button and button for 3 seconds: the message “CONTROLS UNLOCKED” will appear.

CONTROLS LOCKED

CONTROLS UNLOCKED

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BLOCK DIAGRAM

EEPROM

24 LC08

ADC/PLL/Scaler

(GMZAN-2)

MICOM

(MTV312)

Sc hmit t Trigger

( 7 4HCT 14 A)

Panel

Interface

20 Pin

Connector

RGB

H.V

D-

Sub

15P

Control

SDATA

CON

Inverter

5VR

MODPWR-

3.3V_PL3.3VD

5VR

3.3

3.3V

2.5

V_AD

Regulat or

Regulator

Regulat or

KA7805

BA033

VVV

Hsync2

Vsync2

Hsyncm

Vsyncm

2.5VD

RC1171

5VS

12V

CON 5P

<MAINBLOC

DSCL

DSDA

LVDS

Filter

SMPS

Control

TOP246

12V

5VS

CON 5P

Headphone

Audio In

Audio

Processor

(TDA7449)

Audio Amp

(TDA7496L)

SCLSDA

78M08

8VA

12VA

CON 5P

12V

GND

SCL

SDA

Audio

Mute

Audio Mute

U501

12V

U201

U502

U402

U701

U803

U802

U806

U805

U901

U902

EEPROM

24LC02

U702

DESCRIPTION OF BLOCK DIAGRAM

- 9 -

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 C209, 208, 207 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 generates Clock, Horizontal and Vertical sync, Data Enable signals as LCD Panel’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 6 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, U402)

LVDS transmitter (U402) 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, 3.3V, and 5V. Each regulator’s source power is 5VS and 12V from power block. U806 supplies 2.5VD, 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 5VS from power block. U805 supplies MODPWR-3.3V for LCD module’s operation by dropping down 5VS from power block. U803 supplies 5VR for Microprocessor and Logic IC(U701)’s operation by dropping down 12V from power block.

5. Power Block

This block supplies DC voltages of 5VS and 12V by converting AC input voltage of 100~240Vac. Converting method is SMPS(Switching Mode Power Supply).

6. Audio Part(TDA7449, TDA7496L)

In the circuit, audio processor(TDA7449) which is controlled by microprocessor(U501) adjust

volume/treble/bass/balance of audio signal which come from PC. The signal come from TDA7449 is amplified by TDA7496L. The final output signal is output through speaker.

- 11 -

TROUBLESHOOTING GUIDE

1. NO POWER

CHECK U803.

CHECK

U501 PIN 8

VOLTAGE

(5V) ?

NO POWER

(POWER INDICATOR OFF)

CHECK POWER

BOARD, AND FIND

OUT A SHORT POINT

AS OPENING

EACH POWER LINE

CHECK J707

VOLTAGE

PIN1&PIN2(12V)

PIN4(5V)?

CHECK 5VS LINE

(OPEN CHECK)

CHECK

U805 Voltage

(5V) ?

CHECK IIC LINE

CONNECTION

(U501, U502)

CHECK U201 VCC,

XTAL, RESET

IS U201 PIN12

VOLTAGE REPEATED

AS PULSE SHAPE ?

YES

NO PROBLEM

CHECK KEY CONTROL

CONNECTOR ROUTINE

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