LG 808K, FPD1830 Service Manual

AUTO SOURCE/SETOSD

COLOR MONIT OR

SER VICE MANUAL

CAUTION

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

CHASSIS NO. : CL-42 F ACT OR Y MODEL: LG808K

MODEL: FPD1830

1. LCD CHARACTERISTICS

Type : TFT Color LCD Module Size : 18.1inch(45.974cm diagonal) Pixel Pitch : 0.2805(H) x 0.2805(V) Color Depth : 8-bit, 16,777,216 colors Electrical Interface : LVDS Surface Treatment : Anti-Glare, Hard Coating(3H) Operating Mode : Normally Black Backlight Unit : Six-CCFL (Cold Cathode

Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

Left : -60° min., -80°(Typ) Right : +60° min., +80°(Typ) Top : +60° min., +80°(Typ) Bottom : -60° min., -80°(Typ)

2-2. Luminance : 200(min), 250(Typ) 2-3. Contrast Ratio : 200(min), 350(Typ)

3. SIGNAL (Refer to the Timing Chart)

3-1. Sync Signal

Type : Separate Sync, Digital

3-2. Video Input Signal

1) Type : R, G, B Analog

2) Voltage Level : 0~0.70 V a) Black : 0.0 Vp-p b) 128 Gray : 0.35 Vp-p c) Full White : 0.70 Vp-p

3) Input Impedance : 75 Ω

3-3. Operating Frequency

Horizontal : 30 ~ 83 kHz Vertical : 56 ~ 75 Hz

4. MAX. RESOLUTION

Analog : 1280 x 1024

@75Hz

Digital : 1280 x 1024@75Hz

4. POWER SUPPLY

4-1. Power

AC 100~240V, 50/60Hz , 1.0A

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)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 422 mm (16.61'') Depth : 205 mm (8.07'') Height : 424 mm (16.69'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 7.5kg (16.54 lbs) Gross Weight : 9.3kg (20.50 lbs)

CONTENTS

SPECIFICATIONS

- 2 -

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

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

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

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

WIRING DIAGRAM ................................................. 6

BLOCK DIAGRAM ................................................... 7

DESCRIPTION OF BLOCK DIAGRAM.....................8

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

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

PRINTED CIRCUIT BOARD................................... 16

EXPLODED VIEW...................................................19

REPLACEMENT PARTS LIST ...............................21

SCHEMATIC DIAGRAM......................................... 25

MODE

POWER ON (NORMAL)

STAND-BY

SUSPEND

DPM OFF

H/V SYNC

ON/ON OFF/ON ON/OFF

OFF/OFF

POWER CONSUMPTION

less than 55 W

LED COLOR

GREEN

AMBER

VIDEO

ACTIVE

OFF OFF OFF

less than 2 W

(at 115V/60Hz)

- 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

VIDEO

SYNC

<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>

Mode

Sync

H/V

Polarity

Sort

H + 31.469 800 640 16 96 48 V – 70.09 449 350 37 2 60 H – 31.468 900 720 18 108 54 V + 70.08 449 400 12 2 35

H – 31.469 800 640 16 96 48 V – 59.94 525 480 10 2 33 H – 37.5 840 640 16 64 120 V – 75 500 480 1 3 16

H + 37.879 1056 800 40 128 88 V + 60.317 628 600 1 4 23 H + 46.875 1056 800 16 80 160 V + 75.0 625 600 1 3 21 H+/– 49.725 1152 832 32 64 224 V+/– 74.55 667 624 1 3 39 H – 48.363 1344 1024 24 136 160 V – 60.0 806 768 3 6 29 H – 60.123 1312 1024 16 96 176 V – 75.029 800 768 1 3 28 H+/– 68.681 1456 1152 32 128 144 V+/– 75.062 915 870 3 3 39 H+/– 61.805 1504 1152 18 134 200 V+/– 65.96 937 900 2 4 31 H + 63.981 1688 1280 48 112 248 V + 60.02 1066 1024 1 3 38 H + 79.976 1688 1280 16 144 248 V + 75.035 1066 1024 1 3 38

Dot

Clock

25.175

28.321

25.175

31.5

40.0

49.5

57.283

65.0

78.75

100.0

92.978

108.0

135.0

Frequency

Total Period

(E)

Video Active Time

(A)

Front Porch

(C)

Sync Duration

(D)

Back Porch

(F)

Resolution

640x350

70Hz

720x400

70Hz

640x480

60Hz

640x480

75Hz

800x600

60Hz

800x600

75Hz

832x624

75Hz

1024x768

60Hz

1024x768

75Hz

1152x900

75Hz

1152x900

65Hz

1280x1024

60Hz

1280x1024

75Hz

OPERATING INSTRUCTIONS

AUTO SOURCE/SETOSD

FRONT VIEW REAR VIEW

Power Indicator

OSD Button

SOURCE/SET Button

Buttons

Front Control Panel

Power Button

Power Connecter

D-Sub Signal

Connector

DVI-D Signal Connector

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 amber.

3. Button

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

SOURCE/SET Button

Use this button to make Dsub or DVI connector active. This feature is used when two computers are connected to the monitor. The default setting is Dsub. 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.

CN4

CN3

CN6

CN5

CN1

CN7

CN2

J702

J710

J801

P902

P705

WIRING DIAGRAM

Connector Ass’y P/N:

6631T25008Q

6631T11016D

Connector Ass’y P/N:

6631T20015B

Connector Ass’y P/N:

6631T20015G

DESCRIPTION OF BLOCK DIAGRAM

1. Input signal switching part.

There are two inputs which are analog and digital input. They come from each 15 pin D-Sub and 24 pin DVI-D connector.

2. Video Controller 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 pixelclock. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 135MHz.

This part consists of the Scaler, Flash-ROM IC which stores program data,Reset IC. The Scaler gets the video signal converted analog to digital, interpolates input to1280 X 1024 resolution signal and outputs R, G, B signal to transmitter.

The controlled data of each modes and user setting is stored in EEPROM Especially Micom/pre-amp / ADC / Video controller are merged to one chip ‘Gm5120’ by Genesis. .

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 one 5V, one 3.3V and one 2.5 regulators to convert power which is provided 12V, 5V in Power Board. 12V is provided for LCD Panel. Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.

- 9 -

EMI

COMPONENTS

LINE

100 ~ 240V

INPUT RECTIFIE R

AND FILTER

ENERGY

TRANSFER

OUTPUT RECTIFIE R

AND FILTER

12V

GND

SIGNAL

COLLECTION

PHOTO-COUPLER

ISOLATION

PWM CONTROL

CIRCUIT

HVDC

100KHz

PRIMARY

SECONDARY

50 ~ 60Hz

OPERATION DESCRIPTION_POWER

1. EMI components.

This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.

2. Input rectifier and filter.

This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.

3. Energy Transfer.

This part function is transfer the primary energy to secondary through a power transformer.

4. Output rectifier and filter.

This part function is to make a pulse width modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and also the over power protection is also monitor by this part.

5. Photo-Coupler isolation.

This part function is to feed back the dc output changing status through a photo transistor to primary controller to achive the stablized dc output voltage.

6. Signal collection.

This part function is to collect the any change from the dc output and feed back to the primary through photo transistor

POWER BOARD

+ 21 hidden pages

LG 808K, FPD1830 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual