LG FPD1570 Service Manual

COLOR MONIT OR

SER VICE MANUAL

CHASSIS NO. : CL-18

MODEL: FPD1570, LB680A

CAUTION

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

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

≥

10 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

2

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 less than 3 W

LED COLOR

GREEN AMBER AMBER AMBER

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 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

B

D

C

F

E

A

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

99

180

49

160

45

200

20

192

29

256

28

256

25

248

31

320

43

320

38

288

32

352

40

304

45

352

37

308

42

408

42

Sync

Duration

( D )

96

2

108

2

96

2

64

3

56

3

128

4

80

3

64

3

64

3

136

6

96

3

96

3

128

3

134

4

12

3

144

3

Back

Porch

( F )

48 59 54 35 48 33

120

16 80 25 88 23

160

21

152

27

224

39

160

29

176

28

208

36

144

39

200

31

248

38

248

38

Front

Porch

( C )

16 38 18 12 16 10 16

1

56

1

40

1

16

1

32

1

32

1

24

3

16

1

48

1

32

3

18

2

48

1

16

1

MODE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

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.

4

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

3

2

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

On-Screen-Display (OSD) Control

88

100

BRIGHTNESS CONTRAST

9300K 6500K

COLOR

PRESET

RED GREEN BLUE

RGB

61

39

POSITION

To adjust an image size, position, and operating parameters are quick and easy with the On-ScreenDisplay 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:

Listed below are icons, icon names, and icon descriptions of the OSD menu.

BRIGHTNESS CONTRAST

Brightness

Used to adjust the brightness of the screen.

Contrast

Adjust the display to the contrast desired.

COLOR

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

2.

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

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

3.

Use the Buttons to adjust the item to the desired

level.

4.

Accept the changes by pressing the AUTO/SET Button.

5.

Exit the OSD by Pressing the OSD Button.

PRESET

RED GREEN BLUE

POSITION

9300K/ 6500K

To appear the displays color temperature.

• 9300K:Slightly bluish white.

• 6500K:Slightly reddish white.

To set your own color levels. To set your own color levels. To set your own color levels.

Vertical Position

To move image up and down.

Horizontal Position

To move picture image left and right.

TRACKING

CLOCK

PHASE

LANGUAGE ENGLISH

FULL

OSD POSITION

48.3kHz / 60.0Hz PRESET MODE

MODE INFO ON

IMAGE SIZE

SETUP

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.

LANGUAGE

To choose the language in which the control names are displayed.

IMAGE SIZE

This function displays the image in its original size or enlarged size so as to fit in the full screen of the LCD panel.

OSD POSITION

To adjust position of the OSD window on the screen.

MODE INFO

There is information of video modespreset and user modes.

CONTROL LOCATIONS

CN3

J10

J4

J2

CN2

CN1

J301

MAIN PCB

CONTROL PCB

12 5

67

3 4

WIRING DIAGRAM

NO.

1 2 3 4 5 6 7

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

DISASSEMBLY

(a)

1. TILT/SWIVEL REMOVAL

(1) Remove two screws (a). (2) Remove the Tilt/swivel.

(a)

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.

Back Cover

(b)

(a)

(b)

(a)

3. METAL REAR ASSEMBLY REMOVAL

(1) Remove eight screws (a). (2) Remove the Metal rear Ass’y.

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.

J2

J4

J10

(b)

(a)

(b)

(a)

(b)

(a)

5.METAL FRAME ASSEMBLY REMOVAL

(1) Remove five screws (a). (2) Remove six screws (b).

(a)

(3)Remove theMetal Frame Ass’y

(b)

5. INVERYTER REMOVAL

(1) Disconnect CN2,CN3 . (1) Remove two screws (a). (2) Remove the Inverter.

CN3

(a)

6. BACKLIGHT REMOVAL

(1) Remove two screws (a). (2) Remove the Backlight from the LCD Module.

LCD Module

Top (Upper) Backlight Ass’y

(a)

CN2

(a)

Bottom (Lower) Backlight 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

ST

VGS

MONITOR

E

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

F

A

B

C

15

10

5

69

1

14

13

25

6

5V

4.7K

74LS06

OFF ON

OFF

ON

11

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 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