LG LB565T Service Manual

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: LB565T

MODEL: LCD 575LE (LB565T -EA)

*( ) ID LABEL MODEL No.

CONTENTS

SPECIFICATIONS

- 2 -

1. LCD CHARACTERISTICS

Type : TFT XGA LCD Size : 15 inch (38.1cm) Pixel Pitch : 0.297mm (H) x 0.297mm (V) Electrical Interface : LVDS Interface Color Depth : 6-bits/ 16,194,277 colors Active Video Area : 304.1mm (H) x 228.1mm (V) Surface Treatment : Anti-Glare, Hard Coating (3H) Backlight Unit : Bottom edge side 2CCFL

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

10 Left : 50° typ., 50° min. Right : 60° typ., 60° min. Top : 40° typ., 40°min. Bottom : 55° typ., 45° min.

2-2. Luminance : 200 cd/m

typ.

2-3. Angle at Half Luminance

Left : 70° min. Right : 70° min. Top : 40° min. Bottom : 70° min.

2-4. Contrast Ratio : 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 ~ 61 kHz Vertical : 56 ~ 75 Hz

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. Altitude : 0~10,000ft (3,030m)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 394 mm (15.51'') Depth : 161.8 mm (6.37'') Height : 378.7 mm (14.91'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.8 kg (10.58 lbs) Gross Weight : 6.9 kg (15.21 l

bs)

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...................................................17

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

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

SCHEMATIC DIAGRAM......................................... 24

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 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

35.156 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

- 5 -

OPERATING INSTRUCTIONS

FRONT VIEW REAR VIEW

Front Control Panel

24V

AUDIO

DC OUT

AUDIO DC OUT

1. Power ON/OFF Button

This button is used to turn the monitor ON and OFF.

2. Power Indicator

This indicator lights up green when the monitor perates

normally. If the monitor is in DPM (Energy Saving) mode (stand-by/ suspend/power off), this indicator color changes to orange.

3. AUTO/SET Button

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

4. OSD Selection/Adjustment Buttons

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

5. OSD Button

Use this button to enter or exit the on screen display.

Stand Cover

DC Power Connecter

D-Sub Signal Connector

Power ON/OFF Button

Power (DPMS) Indicator

Front Control Panel

• Brightness and Contrast can be adjusted directly without entering the On Screen Display (OSD) system. Touch the buttons to adjust the settings and then the OSD button to save all changes. The Brightness and Contrast functions are also available in the On Screen Display (OSD) menu.

* 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.

PROCESSING

AUTO CONFIGURATION

OSD Selection/Adjustment

Buttons

AUTO/SET Buttons

Power ON/OFF Button

Power (DPMS) Indicator

OSD Buttons

100

- 6 -

WIRING DIAGRAM

CN2

CN1

J10

J11

J10

Connector Ass’y P/N:

6631T1 1012R

Connector Ass’y P/N:

6631T12002B

Connector Ass’y P/N:

6631T20015J

Connector Ass’y P/N:

6631T20013H

BLOCK DIAGRAM

- 7 -

DC/DC

Converter

(L4973)

12V

ST5V

EEPROM

24LC16

ADC/PLL/Scaler

(gmZAN1)

MICOM

(MTV212M)

Switch

FDC6325L

Switch

FDC6325L

Schmitt Trigger

(74HCT14A)

LCD

Interface

20Pin

Connector

(DF14A-20P)

RGB

H.V

D-

Sub

15P

DDC

Control

Jack

SCL

SDA

CON

10P

Inverter

3.3VD

3.3V_PL Module Power 3.3V

3.3V_PL

3.3VD

ST5V

RGB

3.3V_AD

Regulator

BA033

Regulator

BA033

Regulator

BA033

3.3V_AD

+3.3V

LVDS

(LVDS83)

Regulator

BA033

RIN

RCLK

+3.3V

Hsync2 Vsync2

Hsyncm

Vsyncm

DESCRIPTION OF BLOCK DIAGRAM

- 8 -

1. Scaler One chip IC(GMZAN1, U3)

GMZAN1 (U3) 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 C44, 45, 191 with matching IC’s proper cut off voltage. This signal is processed as a proper 8 bit digital signal by U3’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 (U4) distinguishes polarity and frequency by calculating horizontal and vertical sync input from signal source.

2) Microprocessor (U4) carries out power control by sending power-down trigger signal to each IC.

3) Microprocessor (U4) communicates with EEPROM (U1), and GMZAN1 (U3) through IIC(2 lines) or 6 bit bus line. It makes all devices operated properly.

4) Microprocessor (U4) 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. L4973D5.1(U13) , the DC/DC controller IC converts input 12Vdc into 5VS and 3.3Vdc with peripheral circuit composed of Inductor (L11), condensing components (ZD5, C72), and Regulators(U2, U7, U24,U30). MODPWR(3.3V) for LCD module power is switched by U12, switching FET, controlled by Microprocessor.

3.3VD, 3.3V_AD, and 3.3V_PL for GMZAN1 (U3) and 3.3V for LVDS (U9) are switched by U5, 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.

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

24V

AUDIO DC 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 LB565T on the IBM PC.

2) Select EEPROM ALL Init command and Enter.

3) Display cross hatch pattern at Mode 1.

4) Select FOS DEFAULT command and Enter.

5) 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) PRESET START command and Enter.

4) BIAS CAL command and Enter.

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

6) Display color 15,0 pattern at Mode 12.

7) Select DRIVE CAL command and Enter.

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

9) 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.

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