LG 568LM, LM568E-GT Full

AUTO

VOL

MUTE MENU

SET

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-18 F ACTORY MODEL: LM568E

MODEL: LCD 568LM (LM568E-GT)

*( ) ID LABEL MODEL No.

*To apply the Toshiba Module +GmZan2 Chip.

CONTENTS

SPECIFICATIONS

- 2 -

1. LCD CHARACTERISTICS

Type : Color TFT LCD Size : 15.0 inch (38.1cm) Pixel Pitch : 0.297mm x 0.297mm Electrical Interface : LVDS Interface Color Depth : 6-bits/ 16,194,277colors Active Video Area : 304.1mm x 228.1mm Surface Treatment : Anti-Glare, Hard Coating (3H) Backlight Unit : Bottom edge side 2CCFL

(Cold Cathode Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio ≥ 10

Left : 60° typ., 50° min. Right : 60° typ., 50° min. Top : 55° typ., 40° min.

Bottom : 45° typ., 40° min. 2-2. Luminance : 160(min), 200(typ) 2-3. Contrast Ratio : 150(min), 250(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 ~ 61kHz Vertical : 56 ~ 75Hz

4. POWER SUPPLY

4-1. Power Adaptor

Input : AC 100~240V, 50/60Hz 1.2A Output : DC 12V 3.0A

4-2. Power Consumption

5. ENVIRONMENT

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

(Ambient)

5-2. Relative Humidity : 5%~95%

(Non-condensing)

5-3. MTBF : 40,000(Min)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 389.2mm (15.32'') Depth : 161.8mm (6.37'') Height : 382.4mm (15.05'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.8kg (10.58 lbs) Gross Weight : 6.8kg (14.99 lbs)

8. Audio Spec

8-1. Audio AMP

Input : 0.700Vrms Output : 1Wrms+1Wrms S/N : more then 40dB

8-2. Speaker

Impedance : 4

Ω

input : Max: 1.5W, Normal: 1W

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................................... 15

EXPLODED VIEW...................................................18

REPLACEMENT PARTS LIST ...............................20

PIN CONFIGURATION............................................24

SCHEMATIC DIAGRAM......................................... 26

MODE

POWER ON (NORMAL)

STAND-BY

SUSPEND

OFF

POWER OFF

H/V SYNC

ON/ON OFF/ON ON/OFF

OFF/OFF

POWER CONSUMPTION

less than 36 W

less than 3 W less than 3 W

LED COLOR

GREEN YELLOW YELLOW YELLOW

OFF

VIDEO

ACTIVE

OFF 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 LG 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

35.156 KHz

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

(TEXT)

640 x 480

800 x 600

832 x 624

(MAC)

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

1204

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

AUTO

VOL

MUTE MENU

SET

OPERATING INSTRUCTIONS

- 5 -

FRONT VIEW REAR VIEW

Front Control Panel

24V

AUDIO DCOUT

MIC.

AUDIO

MIC. OUT

Power (DPMS) Indicator

1. Power ON/OFF Button

Use this button to turn the monitor On or Off.

2. Power Indicator

This indicator lights up green when the monitor operates normally. If the monitor is in DPM (Energy Saving) mode (stand-by/ suspend/power off), this indicator color changes to yellow.

3. AUTO/SET Button

Use this button to enter a selection in the on screen display.

* AUTO adjustment function

Touch the AUTO/SET button before using OSD menu. This button is for the automatic adjustment of the screen position, clock and phase.

Note: Some signal from some graphics boards may not function properly. If the results are unsatisfactory, adjust your monitor’s Position, Clock and Phase manually.

Use these buttons to choose or adjust items in the on screen display.

Use to adjust the brightness. Use to adjust the volume.

5. MENU Button

Use this button to enter and from the on

screen display (OSD).

6. MUTE Button

Use this button to turn on the audio or off.

Power ON/OFF Button

Front Control Panel

DC Power Connector

MIC. IN

MIC. OUT

HEAD PHONE

AUDIO IN

D-Sub

Signal Connector

PROCESSING

AUTO CONFIGURATION

Buttons

1356

VOL

AUTO

SET

MUTE

MUTE MENU

AUTO

VOL

SET

- 6 -

WIRING DIAGRAM

CN2

CN1

J10

Connector Ass’y P/N: 6631T11012N

BLOCK DIAGRAM

- 7 -

Power Part

DC/DC

Converter

(L4973)

12V

ST5V

EEPROM

24WC08

ADC/PLL/Scaler

(gmZAN1)

(MICOM)

(MTV312)

Switch

FDC6325L

Schmitt Trigger

(74HCT14)

RGB

H.V

D-

Sub

15P

DDC

Control

Jack

SCL

SDA

CON

10P

Inverter

3.3 VD

3.3V_PL

Module Power

3.3V

3.3V_PL

3.3VD

2.5VD

5VR

RGB

3.3V_AD

Regulator

BA033S

3.3V_AD

Headphone

MIC In

MIC Out

Audio In

Audio

Processor

(TDA7449)

Audio Amp

(TDA7496L)

SCLSDA

78 M08

8VA

12V

12V(Audio B/d)

Audio Mute

(Audio B/d)

CON 5P

12V

GND

SCL

SDA

Audio

Mute

12V

Audio Mute

LCD

Interface

20Pin

Connector

(12507WR-20P)

LVDS

(LVDS83)

RIN

RCLK

Regulator

BA033S

Hsync2

Vsync2

Hsyncm

Vsyncm

+3.3V

CON 5P

To Audio B/d

Main B/d

Audio B/d

7805

5VR

2.5VD

Regulator

1725

DESCRIPTION OF BLOCK DIAGRAM

- 8 -

1. Scaler One chip IC(GMZAN2, U201)

GMZAN2 (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. U3 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 GMZAN2 (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. DC/ DC Converter.

This circuit supplies DC power for each device needing DC voltage of 3.3VD, 3.3V_AD, 3.3V_PL, Module Power 3.3V

and 5VS. L4978(U801) , the DC/DC controller IC converts input 12Vdc into 5VS and 3.3Vdc, 2.5Vdc with peripheral circuit composed of condensing components (ZD801, C810), and Regulators(U802,U805). MODPWR(3.3V) for LCD module power is Regulator by U805, Regulator, controlled by Microprocessor.

3.3VD, 3.3V_AD, and 3.3V_PL for GMZAN2 (U201) and 3.3V for LVDS (U401) are switched by U804, switching FET,

controlled by Microprocessor for Power saving.

4. Display Data Transmitter Part (LVDS).

This part transmit digital signal from the Scaler to the receiver of module.

5. Audio Part (TDA7449,TDA7496L)

In This 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.

ADJUSTMENT

- 9 -

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

24V

AUDIO DC OUT

MIC.

AUDIO

MIC. OUT

Figure 1. Cable Connection

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 LM568E on the IBM compatible PC.

2) Display cross hatch pattern at Mode 1.

3) Select EEPROM ALL Init command and Enter.

4) Press "Y" key, it will automatically save all FOS data to EEPROM.

2. Adjustment for White Balance

1) Display color 0,0 pattern at Mode 12.

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 12.

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.

3. DDC Data Write Procedure

1) Use this procedure only when there is some probelm on EDID data.

2) Select EEPROM → EDID Write command and Enter.

3) This will write the EDID data to EEPROM.

- 10 -

TROUBLESHOOTING GUIDE

1. NO POWER

CHECK U501,

U803 LINE

CHECK

U803 PIN 1

VOLTAGE

(12V) ?

NO POWER

(POWER INDICATOR OFF)

CHECK ADAPTER,

AND FIND OUT

A SHORT POINT

AS OPENING

EACH POWER LINE

CHECK J04’S

VOLTAGE

(12V) ?

CHECK U803

CHECK

U803 PIN 3

Voltage

(5V) ?

YES

CHECK KEY CONTROL

CONNECTOR ROUTINE

CHECK U501

CHECK

U501 PIN 8

Voltage

(5V) ?

YES

+ 23 hidden pages