LG FPD1570 Service Manual

COLOR MONIT OR

SER VICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS NO. : CL-18

MODEL: FPD1570, LB680A

CONTENTS

SPECIFICATIONS

1. LCD CHARACTERISTICS

Type : TFT Color LCD Module

Size : 335.0(H) x 273.5(V) x 11.2(D)

Pixel Pitch : 0.243mm x 0.243mm

Color Depth : 8-bit, 16,777,216 colors

Active Video Area : 15.7inch (39.88cm)

(39.832diagnal 311mm x 284.8mm)

Surface Treatment : Anti-Glare, Hard Coating (3H)

Backlight Unit : Two-CCFL (Cold Cathode

Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

Left : 60° typ., 60° min.

Right : 60° typ., 60° min.

Top : 45° typ., 45° min.

Bottom : 45° typ., 45° min.

2-2. Luminance : 200 cd/m

typ.

2-3. Angle at Half Luminance

Left : 45° min.

Right : 45° min.

Top : 45° min.

Bottom : 45° 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 : 30 ~ 80kHz

Vertical : 56 ~ 85Hz

4. POWER SUPPLY

4-1. Power Adaptor

Input : AC 100~240V, 50/60Hz 1.2A

Output : DC 24V 1.2A

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

6. DIMENSIONS (with TILT/SWIVEL)

Width : 370.2mm (14.57'')

Depth : 134.0mm (5.27'')

Height : 387.7mm (15.26'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.5kg (9.92 lbs)

Gross Weight : 6.8kg (14.99 lbs)

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

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

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

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

CONTROL LOCATIONS ......................................... 8

WIRING DIAGRAM ................................................. 8

DISASSEMBLY ....................................................... 9

BLOCK DIAGRAM ................................................. 11

DESCRIPTION OF BLOCK DIAGRAM.............. 12

ADJUSTMENT ...................................................... 13

TROUBLESHOOTING GUIDE .............................. 14

PRINTED CIRCUIT BOARD................................... 20

EXPLODED VIEW...................................................22

REPLACEMENT PARTS LIST ...............................24

PIN CONFIGURATION............................................31

SCHEMATIC DIAGRAM......................................... 36

MODE

POWER ON (NORMAL)

STAND-BY

SUSPEND

DPM OFF

POWER OFF

H/V SYNC

ON/ON

OFF/ON

ON/OFF

OFF/OFF

POWER CONSUMPTION

less than 36 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 Gate Way. 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.

CAUTION

• There is two backlight, must distinguish between

the top (upper) and the bottom (lower), and be

careful of treatment it.

• MTBF (Mean Time Between Failure) of a backlight

is about 25,000 hours.

Top (Upper) Backlight Ass’y

(P/N: 6913TZZ003A)

Bottom (Lower) Backlight Ass’y

(P/N: 6913TZZ003B)

IF BRIGHTNESS OF THE LCD MODULE DARKEN,

REPLACE THE BACKLIGHT ONE OR ALL.

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)

H (Pixels)

V (Lines)

H (Pixels)

V (Lines)

Sync

Polarity

–

+/–

–

+/–

Dot

Clock

25.175

28.321

25.175

31.5

36.0

40.0

49.5

56.25

57.283

65.0

78.75

94.5

100.0

92.978

108.0

135.0

Frequency

31.469 KHz

70.8 Hz

31.468 KHz

70.8 Hz

31.469 KHz

59.94 Hz

37.5 KHz

75 Hz

43.269 KHz

85.0 Hz

37.879 KHz

60.317 Hz

46.875 KHz

75.0 Hz

53.674 KHz

85.061 Hz

49.725 KHz

74.55 Hz

48.363 KHz

60.0 Hz

60.123 KHz

75.029 Hz

68.677 KHz

84.997 Hz

68.681 KHz

75.062 Hz

61.805 KHz

65.96 Hz

63.981 KHz

60.02 Hz

79.976 KHz

75.035 Hz

Resolution

640 x 350

720 x 400

640 x 480

800 x 600

832 x 624

1024 x 768

1152 x 870

1152 x 900

1280 x 1024

Total

Period

( E )

800

449

900

449

800

525

840

500

832

509

1056

628

1056

625

1048

631

1152

667

1344

806

1312

800

1376

808

1456

915

1504

937

1688

1066

1688

1066

Video

Active

Time ( A )

640

350

720

400

640

480

640

480

640

480

800

600

800

600

800

600

832

624

1024

768

1024

768

1024

768

1152

870

1152

900

1280

1024

1280

1024

Blanking

Time

( B )

160

180

160

200

192

256

248

320

288

352

304

352

308

408

Sync

Duration

( D )

108

128

136

128

134

144

Back

Porch

( F )

120

160

152

224

160

176

208

144

200

248

Front

Porch

( C )

MODE

OPERATING INSTRUCTIONS

FRONT VIEW REAR VIEW

Front Control Panel

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; in DPMS (Energy Saving) mode,

-stand-by, suspend, or power off mode -its color

changes to orange.

3. Button

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

display.

AUTO/SET Button

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

5. OSD Button

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

Buttons

OSD Button

AUTO/SET Button

Power Button

Power Indicator

DC Power Connecter

D-Sub Signal

Connector

15 4

100

• 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

BRIGHTNESS CONTRAST

On-Screen-Display (OSD) Control

To adjust an image size, position, and operating

parameters are quick and easy with the On-Screen-

Display control system, using the OSD button and the

Adjustment control button. A quick example is given below

to familiarize you with use of the controls.

Example;

Note:

Allow the monitor to stabilize for at least 30 minutes

before making image adjustment.

To make adjustments in the On Screen Display, follow these

steps:

1. Press the OSD Button, then the main menu of the OSD

appears.

To acces a control, use the or Buttons. When the icon

you want becomes highlighted, press the AUTO/SET Button.

Use the Buttons to adjust the item to the desired

level.

Accept the changes by pressing the AUTO/SET Button.

Exit the OSD by Pressing the OSD Button.

Listed below are icons, icon names, and icon descriptions

of the OSD menu.

100

BRIGHTNESS CONTRAST

9300K 6500K

COLOR

PRESET

RED

GREEN

BLUE

Brightness

Used to adjust the brightness of the

screen.

Contrast

Adjust the display to the contrast

desired.

COLOR

POSITION

PRESET

RED

GREEN

BLUE

9300K/ 6500K

To appear the displays color

temperature.

• 9300K:Slightly bluish white.

• 6500K:Slightly reddish white.

To set your own color levels.

Vertical Position

To move image up and down.

Horizontal Position

To move picture image left and right.

TRACKING

SETUP

TRACKING

CLOCK

PHASE

To minimize any vertical bars or

stripes visible on the screen

background.The horizontal screen

size will also change.

To adjust the focus of the display.

This item allows you to remove any

horizontal noise and clear or

sharpen the image of characters.

CLOCK

PHASE

LANGUAGE ENGLISH

FULL

OSD POSITION

48.3kHz / 60.0Hz

PRESET MODE

MODE INFO ON

IMAGE SIZE

SETUP

To choose the language in which the

control names are displayed.

This function displays the image in its

original size or enlarged size so as to

fit in the full screen of the LCD panel.

To adjust position of the OSD

window on the screen.

There is information of video modes-

preset and user modes.

LANGUAGE

IMAGE SIZE

OSD POSITION

MODE INFO

CONTROL LOCATIONS

MAIN PCB

CONTROL PCB

12 5

NO.

Ref. No.

SW301

SW304

SW303

SW306

SW302

SW307

SW305

Control Function

OSD BUTTON

ADJUST LEFT

ADJUST UP

ADJUST DOWN

ADJUST RIGHT

AUTO/SET

POWER SWITCH

WIRING DIAGRAM

CN3

J10

CN2

CN1

J301

DISASSEMBLY

(a)

1. TILT/SWIVEL REMOVAL

(1) Remove two screws (a).

(2) Remove the Tilt/swivel.

2. BACK COVER REMOVAL

(1) Remove four sheet (a) from Back Cover.

(2) Remove four screws (b) from the Back Cover.

(3) Remove the Back Cover.

3. METAL REAR ASSEMBLY REMOVAL

(1) Remove eight screws (a).

(2) Remove the Metal rear Ass’y.

(a)

Back Cover

(b)

(a)

J10

(a)

(b)

4. CONTROL, MAIN PCB ASSEMBLY

REMOVAL

(1) Disconnect J2, J4 and J10.

(2) Remove four screws (a).

(3) Remove the Main PCB Ass’y.

(4) Remove three screws (b).

(5) Remove the Control PCB Ass’y.

CN3

CN2

6. BACKLIGHT REMOVAL

(1) Remove two screws (a).

(2) Remove the Backlight from the LCD Module.

5. INVERYTER REMOVAL

(1) Disconnect CN2,CN3 .

(1) Remove two screws (a).

(2) Remove the Inverter.

Bottom (Lower) Backlight Ass’y

Top (Upper) Backlight Ass’y

LCD Module

(a)

(b)

5.METAL FRAME ASSEMBLY

REMOVAL

(1) Remove five screws (a).

(2) Remove six screws (b).

(3)Remove theMetal Frame Ass’y

D-SUB

Video Controller

MX88L282

LVDS

(LVDS83)

LVDS

(LVDS83)

Memory

(KM416S102BT)

H-Sync

A/D

converter

AD9884

M-CLK

Out - CLK

DE ,H/V Sync out

R,G,B odd

Out - CLK

DE ,H/V Sync out

R,G,B Even

LCD Module

R,G,B

differential

L VDS:Low Voltage Differential Signaling

Data 48 BitAddress

H-Sync

R,G,B

3.3V

ADC CLK

R,G,B

even, odd

Micom

68HC08-BD48

Inverter CTL

Module CTL

V-Sync

Power CTL

H-Sync

3.3V

Inverter

24V

DC-DC

Converter

3.3V

Reg.

3.3V

24V Input

5.0V

Video Signal

3.3V

DESCRIPTION OF BLOCK DIAGRAM

- 12 -

1. Pre-amp/ ADC / PLL Part.

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.

2. Video Controller Part.

This part consists of the Scaler and frame buffers which converts frame rate of input signal to 60Hz frame rate.

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.

3. Display Data Transmitter Part.

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

4. Power Part.

This part consists of the DC/DC converter and several 3.3V regulators .

The DC/DC converter coverts 24V to be entered power adapter to 5V.

5V, output of DC/DC converter, supply to the micom and 3.3V regulators.

The output voltage of 3.3V regulator supply to IC of each part.

5. 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 mode is stored in EEPROM.

6. Inverter

The inverter converts from 24V to AC 700Vrms and drive back-light lamp of module.

ADJUSTMENT

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

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 FPD1570 on the IBM

compatible PC.

2) Select EEPROM all clear command and Enter.

3) Display cross hatch pattern at Mode 1.

4) Select COMMAND PRESET START command.

5) Select FOS DEFAULT command and Enter.

6) 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 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 auto-

matically 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.

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