LG L1810B, LB800H Schematic

SOURCE

AUTO/SELECT

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-29 F ACTORY MODEL: LB800H

MODEL: L1810B(LB800H-UL)

*( ) ID LABEL MODEL No.

1. LCD CHARACTERISTICS

Type : TFT SXGA LCD Size : 18inch 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, Positive/Negative Composite, SOG (Sync On Green) Digital

3-2. Video Input Signal

1) Type : R, G, B Analog

2) Voltage Level : 0~0.71 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(Built-in Power)

Input : 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 : 406 mm (15.98'') Depth : 223 mm (8.78') Height : 431 mm (16.97'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 7.8kg (17.19 lbs) Gross Weight : 10.0kg (22.04 lbs)

8. USB

Upstream : 1 port, Downstream : 2 port Speed : Full-12Mbps, Low-1.5Mbps

CONTENTS

SPECIFICATIONS

- 2 -

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

PRECAUTIONS ....................................................... 4

TIMING CHART ....................................................... 5

OPERATING INSTRUCTIONS ................................ 6

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

BLOCK DIAGRAM ................................................... 9

DESCRIPTION OF BLOCK DIAGRAM...................10

ADJUSTMENT ...................................................... 12

TROUBLESHOOTING GUIDE .............................. 13

PRINTED CIRCUIT BOARD................................... 18

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

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

PIN CONFIGURATION............................................30

SCHEMATIC DIAGRAM......................................... 32

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 53 W

less than 3 W less than 3 W

LED COLOR

GREEN AMBER AMBER AMBER

OFF

VIDEO

ACTIVE

OFF OFF OFF

- 3 -

Signal Connector Pin Assignment

Pin Signal (DVI-I)

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15

T. M. D. S. Data2T. M. D. S. Data2+ T. M. D. S. Data2/4 Shield T. M. D. S. Data4T. M. D. S. Data4+ DDC Clock DDC Data Analog Vertical Sync. T. M. D. S. Data1T. M. D. S. Data1+ T. M. D. S. Data1/3 Shield T. M. D. S. Data3T. M. D. S. Data3+ +5V Power Ground

(return for +5V,

H. Sync. and V. Sync.)

Pin Signal (DVI-I)

16 17 18 19 20 21 22 23

24 C1 C2 C3 C4 C5

Hot Plug Detect T. M. D. S. Data0T. M. D. S. Data0+ T. M. D. S. Data0/5 Shield T. M. D. S. Data5T. M. D. S. Data5+ T. M. D. S. Clock Shield T. M. D. S. Clock+ T. M. D. S. ClockAnalog Red Analog Green Analog Blue Analog H. Sync. Analog Ground

T. M. D. S. (Transition Minimized Differential Signaling)

• DVI-I Connector (Digital/Analog)

- 4 -

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

- 5 -

VIDEO

SYNC

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

H + 31.469 800 640 16 96 48 V – 70.8 449 350 38 2 59

H – 43.269 832 640 56 56 80 V – 85.0 509 480 1 3 25

H – 31.469 840 640 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 – 31.468 900 720 18 108 54 V + 70.8 449 400 12 2 35

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 + 53.674 1048 800 32 64 152 V + 85.061 631 600 1 3 27 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 + 68.677 1376 1024 48 96 208 V + 84.997 808 768 1 3 36 H+/– 68.681 1456 1152 32 128 144 V+/– 75.062 915 870 3 3 39 H+/– 61.805 1504 1125 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

Mode

H/V

Sort

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

640x350

70Hz

640x480

85Hz

640x480

60Hz

640x480

75Hz

720x400

70Hz

800x600

60Hz

800x600

75Hz

800x600

85Hz

832x624

75Hz

1024x768

60Hz

1024x768

75Hz

1024x768

85Hz

1152x870

75Hz

1152x900

65Hz

1280x1024

60Hz

1280x1024

75Hz

Sync

Polarity

Frequency

Dot

Clock

Total Period

(E)

Video Active Time

(A)

Sync Duration

(D)

Back Porch

(F)

Front Porch

(C)

Resolution

- 6 -

FRONT VIEW

Front Control Panel

REAR VIEW

OPERATING INSTRUCTIONS

SOURCE

AUTO/SELECT

Front Control Panel

Power Connect

USB Port

213 46 5

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 display is in DPM(Energy

Saving)mode, this indicator color change to amber.

3. MENU Button

Use these buttons to enter or exit the On Screen Display.

▼▲◀▶

Button

Use these buttons to choose or adjust items in the On Screen Display.

5. AUTO/SELECT Button

Use this button to enter a selection in the On Screen Display.

6. SOURCE 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.

DVI Connect

D-Sub Signal Connect

- 7 -

Making use of USB (Universal Serial Bus)*

USB (Universal Serial Bus) is an innovation in connecting your different desktop peripherals conveniently to your computer. By using the USB, you will be able to connect your mouse, keyboard, and other to your monitor instead of having to connect them to your computer. This will give you greater flexibility in setting up your system. USB allows you to connect chain up to 120 devices on a single USB port, and you can “hot” plug (attach them while the computer is running) or unplug them while maintaining Plug and Plug auto detection and configuration. This monitor has an integrated BUS-powered USB hub, allowing up to 2 other USB devices to be attached it.

USB connection

1. Connect the upstream port of the Display to the downstream port of the USB compliant PC or another hub using the USB cable. (Computer must have a USB port)

2. Connect the USB compliant peripherals to the downstream ports of the monitor.

NOTE

To activate the USB hub function, the monitor must be connected to a USB compliant PC(OS) or another hub with the USB cable(enclosed).

When connecting the USB cable, check that the shape of the connector at the cable side matches the shape at the connecting side.

Even if the monitor is in a power saving mode, USB compliant devices will function when they are connected the USB ports(both the upstream and downstream) of the monitor.

USB downstream Port

connect the cables from USB compliant peripherals-such as keyboard, mouse, etc

This is a simplified representation

of rear view.

To USB downstream port of the USB compliant PC or another hub cable

MODULE

MAIN PCB

MATAL FRAME

J702

J801

J705

P902

J710

CN7

CN3

CN2

CN1

CN6

CN5

CN4

CN_C01

CN301

CN_C02

- 8 -

WIRING DIAGRAM

Connector Ass’y P/N:

6631T11012P

Connector Ass’y P/N:

6631T25008Q

Connector Ass’y P/N:

6631T20008U

Connector Ass’y P/N:

6631T20015R

- 9 -

D-SUB

DVI-I

Gm5020

including

(ADC / TMDS Rx )

LVDS

(THC63LVD823)

Memory

(KM416S102BT)

H-Sync A

V-Sync A

Micom

68HC08-BD48

M-CLK

Out - CLK

DE ,H/V Sync out

R,G,B Even/Odd

LCD Module

R,G,B

differential

LVDS:Low Voltage Differential Signaling

Data 48Bit

Address

Inverte r CTL

Module CTL

R,G,B

Inverter

Digital Signal

3.3V

Reg.

DVDD 3 .3 V

AVD D 3. 3 V

12V

Powe r CTL

V-Sync

12V

2.5V

Reg.

DVDD2.5V

AVDD2.5V

3.3V

Reg.

PVDD 3 .3 V

3.3 VM

5V 5V

DVI-Analog Signal

R,G,B

H-Sync B

V-Sync B

BA7657

(Video Switch)

R,G,B

H/V-Sync

Hsync

Switch

(A or B)

H-Sync A

H-Sync

H-Sync B

3.3 VM

Power Board

12V

BLOCK DIAGRAM

- 10 -

DESCRIPTION OF BLOCK DIAGRAM

1. Input signal switching part(BA7657).

There are two anolog inputs which are D-Sub analog and DVI-anolog input. They come from each 15 pin D-Sub and 29 pin DVI-I connector.

2. Video Controller Part(GM5020).

This part amplifies the level of video signal for the anolog to 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 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 to1280 X 1024 resolution signal and outputs 8-bit R, G, B signal to transmitter. Especially pre-amp / ADC / Video controller are merged to one chip ‘Gm5020’ by Genesis. Also FRC is separate.

3. Display Data Transmitter Part(LVDS).

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

4. Power Part.

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

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 modes is stored in EEPROM.

6. Inverter

The inverter converts from DC12V to AC 700Vrms and operate back-light lamp of module.

- 11 -

EMI

COMPONENTS

LINE

100 ~ 240V

INPUT RECTIFIE R

AND FILTER

ENERGY

TRANSFER

OUTPUT RECTIFIE R

AND FILTER

12V

GND

SIGNAL

COLLENTION

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

- 12 -

ADJUSTMENT

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.

1. Adjustment Start

1) Display any pattern at any Mode.

2) Run alignment program for LB800H on the IBM compatible PC.

3) Select EEPROM → ALL INIT command and Enter

4) This will make all data to default state

5) Select COMMAND → PRESET START command and Enter

2. Adjustment for Factory Preset Mode

1) Select DIST. ADJ → FOS DEFAULT command and Enter

2) It will copy all factory default data to EEPROM automatically.

3. Adjustment for White Balance

1) Display color 0,0 pattern at Mode 15.

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 15.

6) Select DRIVE CAL command and Enter.

7) 5800K and 9300K are automatically adjusted and saved to the EEPROM.

8) Select PRESET EXIT command and Enter.

4. Adjustment for EDID

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

2) Connect the D-sub cable.

3) Select EEPROM → EDID Write command and Enter.

4) Select DDC(A) Write command and Enter.

5) Connect the DVI-I cable.

6) Select DDC(D) Write command and Enter.

220

IBM Compatible PC

Video Signal Generator

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

- 13 -

TROUBLESHOOTING GUIDE

1. NO POWER

TROUBLE IN BULT-IN POWER

CHECK J801

5VST VOLTAGE

(5V) ?

NO POWER

(POWER INDICATOR OFF)

TROUBLE

SOMEWHERE ELSE

TROUBLE IN BULT-IN POWER

CHECK J801

INPUT VOLTAGE

(12V) ?

TROUBLE IN U501 or X501

YES

CHECK

U501’s PIN 6.

IS THIS PIN

OSCILLATED?

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