LG Flatron L3020T, Flatron L3020A, Flatron L3020AL-ALT, Flatron L3020AL-ALA, Flatron AGA Service Monitor

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-49

MODEL: L3020T (L3020AL-AL**T)

L3020A (L3020AL-AL**A)

( ) **Same model for Service

MAIN

1. LCD CHARACTERISTICS

Type : TFT Color LCD Module
Size : 30inch
Pixel Pitch : 0.5025 x 0.1675 x RGB
Color Depth : 8-bit, 16,777,216 colors
Electrical Interface : LVDS
Active Display Area :

643.2mm x 385.92mm -LPL Module

: 683.6mm x 433.6mm -CMO Module

Surface Treatment :

Anti-Glare, Hard Coating(3H) -LPL Module

:

Anti-Glare, Hard Coating(2H) -CMO Module
Operating Mode : Normally Black, Transmissive
Backlight Unit : 16-CCFL (Cold Cathode

Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

10

Left : -80° min., -85°(Typ)
Right : +80° min., +85°(Typ)
Top : +80° min., +85°(Typ)
Bottom : -80° min., -85°(Typ)

2-2. Luminance : 380(min), 450(Typ)

-LPL Module

450(min), 500(Typ)

-CMO Module

2-3. Contrast Ratio : 280(min), 350(Typ)

-LPL Module

500(Typ)

-CMO Module

3. SIGNAL (Refer to the Timing Chart)

3-1. PC & Video Input

1)Signal Input : S-video,RCA, Component

2)Input Form : D-SUB Analog, DVI-D,V1(CVBS)
V2(SVHS), DVD(Ycbcr),HDTV(YPbPr),
TV-NTSC(Opion)

3)Resolution(max) : Analog -1280 x 1024

Digital -1280 x 1024

3-2. Audio Signal

1) Input: PC : 700mVrms

AV : 450mVrms

2) Output: PC : 8W

AV : 8W

3-3. Sync Input

Horizontal : 30 ~ 66kHz(Digital: 30~63kHz)
Vertical : 56 ~ 85Hz
Input Form : Separate, TTL,

Positive/Negative Digital

4. POWER SUPPLY

4-1. Power Adaptor

Input : AC 100~240V, 50/60Hz , 2.0A
Output : DC 5V 0.9A, DC12V 1.5A

DC18V 1.0A, DC24V 5.0A

4-2. Power Consumption

5. ENVIRONMENT

6-1. Operating Temperature: 10°C~35°C (50°F~95°F)

6-2. Operating Humidity : 10%~80%

6-3. MTBF : 50,000 Hours(Min.)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 734 mm (28.90'')
Height : 538 mm (21.18'')
Depth : 191 mm (7.52'')

7. WEIGHT (with TILT/SWIVEL)
LPL Module

Net. Weight : 16.4kg (36.16 lbs)
Gross Weight : 21.7kg (47.84 lbs)

CMO Module

Net. Weight : 17kg (37.48 lbs)
Gross Weight : 22.5kg (49.61 lbs)

CONTENTS

SPECIFICATIONS

- 2 -

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

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

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

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

WIRING DIAGRAM ............................................... 10

BLOCK DIAGRAM ................................................. 12

DESCRIPTION OF BLOCK DIAGRAM...................13

ADJUSTMENT ...................................................... 14

TROUBLESHOOTING GUIDE .............................. 16

EXPLODED VIEW...................................................23

REPLACEMENT PARTS LIST ...............................25

PIN CONFIGURATION............................................35

SCHEMATIC DIAGRAM......................................... 37

MODE

POWER ON (NORMAL)

STAND-BY

SUSPEND

POWER OFF

CUT-OFF SWITCHOFF

H/V SYNC

ON/ON
OFF/ON
ON/OFF

OFF/OFF

-

POWER CONSUMPTION

less than 160 W

less than 5 W
less than 5 W

less than 5 W
less than 1 W

LED COLOR

GREEN
AMBER
AMBER
AMBER

OFF

VIDEO

ACTIVE

OFF
OFF
OFF

-

- 3 -

Signal Connector Pin Assignment

Pin Signal (DVI-D)

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-D)

1

8

9

17

24

16

16
17
18
19
20
21
22
23
24

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. Clock-

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

• DVI-D Connector (Digital)

- 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

B

D

C

F

E

A

<< 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 37 2 60

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

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 – 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 + 63.981 1688 1280 48 112 248
V + 60.02 1066 1024 1 3 38

H + 47.7 1680 1280 66 134 200
V + 60 795 768 1 3 23

Mode

H/V

Sort

1

2

3

4

5

6

7

8

9

10

11

12

13

25.175

28.321

25.175

31.5

36.0

40.0

49.5

56.25

57.283

65.0

78.75

108.0

80.14

640x350

70Hz

640x480

85Hz

640x480

60Hz

640x480

75Hz

720x400

70Hz

800x600

60Hz

800x600

75Hz

800x600

85Hz

832x624

75Hz

1024x768

60Hz

1024x768

75Hz

1280x1024

60Hz

1280x768

60Hz

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

REAR VIEW CONNECTOR PANEL

REAR VIEW

OPERATING INSTRUCTIONS

Front Control Panel(P7)

RS-232C EXT.

Theft prevention
locking device

Theft prevention
locking device

Back

Cap

1.

RS-232C Terminal

: The RS-232C protocol is used for communication

between the PC and monitor. You can turn the
monitor on/off, seslect an input source or adjust the

OSD menu from your PC.
The cable for RS-232C terminal connection is not an
accessory included in the product.
Please purchase the cable.

2. DVI Digital Signal Connector

3. D-SUB Analog Signal Connector

4. TV Tuner Jack: Connect the antenna.

-L3020T(Option)

5. Connect the power cord

6. Speaker Terminal: Connect the speaker

PC Audio Input Terminal

-Connect the audio cable

to the LINE OUT jack in the

PC sound card

Headphone/earphone
Connection Terminal

S-Video Input Terminal

AV Output Terminal
(Audio)

DVD Input Terminal

AV Input Terminal(Audio)

AV Output Terminal
(Video)

AV Input Terminal(Video)

HDTV Input Terminal

MAIN

RS-232C

EXT.

- 7 -

OPERATING INSTRUCTIONS

Front Control Panel

MAIN

MAIN

7

2

1568 3 4

• Press the button to turn on the power. Press the button again to turn it off.

• The power LED will be on when power is on.

Power Button

Power (DPMS)

Indicator

Adjust the volume

•

Adjust brightness and contrast.
Press the Menu button to hide
the screen

• Use this button toshow/hide the OSD(on Screen Display) menu screen.

MENU Button

•

Use the button to select an icon or adjust the setting in the OSD screen .

OSD

Buttons

[For DSUB signal]

•Select the icon to adjust on the OSD screen.

•If you press the [AUTO/SELECT] button,

automatic screen adjustment will be started.

AUTO/SELECT Button

1
2

3
4

5

6

8

7

This function allows you to secure the current control settings, so that they cannot be
inadvertently changed. Press and hold the MENU button and right button for 3 seconds:
the message “CONTROLS LOCKED” appears.

You can unlock the OSD controls at any time by pushing the MENU button and right
button for 3 seconds:
the message “CONTROLS UNLOCKED” will appear.

•

Use this button to select an input signal.

• DVI DIGITAL: DVI digital signal

• DSUB ANALOG: 15-pin D-sub analog signal

• VIDEO1 (CVBS): Composite video

• VIDEO2 (S-Video): S-video

• DVD(Y, Cb, Cr): DVD

• HDTV(Y, Pb, Pr): HD television

• TV: television -L3020T(Option)

SOURCE

Button

CONTROLS LOCKED/UNLOCKED :
MENU and

Remote Control Sensor

Power On/Off switch

AUTO/SELECT

SOURCE

[Other signals that DSUB]

•The current signal and mode information will
be displayed.

- 8 -

Remote Controller Buttons

Power On/Off Button

Channel Up/Down Button

•

Input Select Button

•

TV/AV Button

(See next page)

Sleep Button

When watching AV/DVD/HDTV/TV(L3020T)

AV/DVD/HDTV(L3020A)

-

The monitor will be automatically turned off
after a certain period of time.
Press this button repetitively to select an
appropriate time duration

PSM Button

When watching AV/DVD/HDTV/TV(L3020T)

AV/DVD/HDTV(L3020A)

- Automatically adjusts the image.
Press this button repetitively to set the
intended screen.

CAPTION Button

- L3020T(Only U.S.A)
There is not a function

which is supported

- L3020A

•

Menu Button

•

Exit Button

Auto Channel Button

TV: Automatic TV channel setup

(Applicable to the model equipped
with the TV tuner) - (Option)L3020T

PC: Automatic adjustment function

(Operational for the analog signal only)

Channel Number Select

Button

Operational at the TV mode only

Check Button

Sound Mode Select

Select the sound mode

: MONO/STEREO/SAP-(Only U.S.A)

MONO/STEREO-AV

Video Operation Button

Applicable for LG products only

Volume Button

Mute button

- 9 -

1. PIP (Picture in Picture) Button

The sub-screen moves to the next mode whenever you press this button.
: Small -> Large -> Off

2. POP (Picture out Picture) Button

The sub-screen moves to the next mode whenever you press this button.
: POP ON -> PBP(FULL) -> PBP(4:3) -> OFF

If you press the button once,
the following Input Signal
Window will appear. Select
the signal type you want

using the button.

This button will be enabled only
when you selected the TV/AV
signal. The signal type will be
changed with the following order.
Set the signal type you want.

POP ON PBP (FULL) PBP (4:3)

•

Input Select Button

•

TV/AV Button

3. Swap Button

You can swap the main screen and the sub-screen when the PIP/POP/PBP
function is used..

When 'Input Signal 1' comes on in the main screen, only
'Input Signal 2' can be displayed on the sub-screen. On the
contrary, if the main screen displays 'Input Signal 2', the sub­screen can display 'Input Signal 1' only. You can swap 'Input

Signal 1' and 'Input Signal 2' using the SWAP button.

<Table of PIP/POP/PBP Function Support> -L3020T

<Table of PIP/POP/PBP Function Support> -L3020A

TV VIDEO1 VEDIO2 DVD HDTV

VIDEO1 VEDIO2 DVD HDTV

SWAP

SWAP

PIP

POP

PBP

AV

- 10 -

WIRING DIAGRAM(LPL Module)

CN1

CN1

J503

J506

J602

J108

J601

J604

J605

J401

J402

J201

J505

J801

J802

J803

J804

Connector Ass’y P/N:
6631T11016A

Connector Ass’y P/N:
6631T20029C

Connector Ass’y P/N:
6631T20028D

Connector Ass’y P/N:
6631T20028C

Connector Ass’y P/N:
6631T12002P

Connector Ass’y P/N:
6631T12002N

Connector Ass’y P/N:
6631T20029B

Connector Ass’y P/N:
6631T20028E

Connector Ass’y P/N:
6631T20028B

- 11 -

WIRING DIAGRAM(CMO Module)

CN1

CN1

J503

J506

J602

J108

J601

J606

J607

J402

J201

J505

J801

J802

J803

J804

J403

Connector Ass’y P/N:
6631T11016K

Connector Ass’y P/N:
6631T20029C

Connector Ass’y P/N:
6631T20028E

Connector Ass’y P/N:
6631T20028B

Connector Ass’y P/N:
6631T20028D

Connector Ass’y P/N:
6631T20028C

Connector Ass’y P/N:
6631T20020T

Connector Ass’y P/N:
6631T120020S

Connector Ass’y P/N:
6631T20029B

- 12 -

DDR

BLOCK DIAGRAM

128Mb

Video Signal

SDRAM

3.3V

(HY5DU283222Q4)

(29LV040B)

Memory

4Mb Flash

LCD

Module

Even

R,G,B

1.8V

2.5V

3.3V
5V

12V

24V

DC/DC

Regulator

(CMO)

(LPL)

5V

12V

Power

Built-in

Format Converter

2.5V

Circuit

Data

(FSD 0 ..31)

(FSA 0 ..11)

3.3V

2.5V

1.8V

DDC-A

EEPROM

DDC-D

EEPROM

H/ V Sync

Digital Signal

Data

(OCMD 0 ..7)

(OCMA 0 ..19)

(gm1501)

Processor

Video Signal

24Bit

Analog Signal

INV_PWR

LCM_PWR

AMP_PWR

PCB_PWR

System

EEPROM

(FLI2310)

Deinterlacer

64Mb

SDRAM

(HY57V643220)

Control Signals

16 Bit

YUV

Only USA

PCB_PWR

INV_PWR

Caption/V-Chip

Video

Decoder

LCM_PWR

AMP_PWR

12V

(M37136)

Video Out

(VPC3230)

Video Filter(5.2Mhz)

CVBS PAL

CVBS Out

8V

Audio

Amp

(TPA3004D2)

Audio

Decoder

SP (R)

TPA6110

VAROUTR/L

(MSP3420G)

Switch

Analog

H/ V Sync

RGB

D VI-D

D-SUB

(BA7657F)

YPbPr

HDTV

RXD

TXD

MAX232C

Port

Serial

DVD

Y/Cb/Cr

Y-out

C-out

CVBS 1

CVBS 2(Tuner)

S/W

(CXA2040AQ)

Y/C-in

Filter

Y/C-out

(UPD64083)

3D Comb

CVBS Audio

CVBS Out

Out

DTV Audio

DVD Audio

CVBS Audio

PC Audio

- 13 -

DESCRIPTION OF BLOCK DIAGRAM

1. Input Selection Circuit

1) Analog Input Selection
This block is composed of BA7657F(U103) and
peripheral devices.
There are analog H/V Syncs. BA7657F IC chooses one
input and outputs selected input through sync selection
pin (Pin 1).

2) Video Input Selection
This block is composed of video S/W IC (CXA2040Q,
U3) and peripheral devices. There are three inputs in
CXA2040Q IC(CVBS video signal through RF tuner,
video input CVBS, S-video signal). One selected video
signal is transmitted a video decoder IC (VPC3230, U1)

2. DDC controller

This block is composed of GM1501(U402) and
peripheral EEPROM IC(U107,U108).
GM1501(U402) controls peripheral devices through IIC
line.
Major functions are (1) to control Flash memory
through DDC-SCLA, DDC-SDAA of D-sub and (2) to
store EDID data in the EEPROM (U107,U108).

3. Video Decoder

This block is composed of VPC 3230 (U1) and
peripheral devices.
GM 1501 controls this IC through IIC Line.
This IC analyzes input signal of CVBS, Y/C and output
analyzed signal (8bit interlace signal) to De-interlace
block.
Analyzed signal has video control signals like Contrast,
Brightness, Sharpness, Color, tint signals Including
Adaptive Comb Filter.

4. Audio Decoder

This block is composed of MSP3420G (U503) and
peripheral devices.
GM 1501 controls this IC through IIC Line.
This IC analyzes audio input signal through A/V Jack
and PC audio.
The analyzed signals transmitted to audio amplifier
(TPA3004, U505).

5. Audio Amplifier

This block is composed of TPA3004 (U505) and
peripheral devices.
The function of the audio amplifier is that to amplify
audio L/R signal transmitted from audio decoder. The
audio signal is amplified according to pre-defined DC
volume control curve. Also, Headphone
amplifier(Tpa6110, U501) is controlled through Line­out.

6. De-interlacer

This block is composed of FLI 2310(U301) and
peripheral devices.
GM1501 (U402) controls this IC through IIC Line.
And this IC converts 8 Bit Interlaced Y/UV signal to De­interlaced signal.
It output converted signal to Format Converter IC(GM
1501, U402).

7. Format Converter

This block is composed of GM 1501(U402) and
peripheral devices. GM 1501(Scaler,U402) contains
MICOM.

1) This IC contain A/D converter, Pre-amp and PLL
circuit that converting analog video signal(0.7Vp-p)
through D-sub(J103) Pin to digital signal.

2) This IC Decode TMDS signals of 8 line from DVI-D
Pin (J202) and transmit to LVDS Transmitter.

GM 1501 is Format Converter IC that receives Digital
signal and outputs proper frame signal to LCD Module
Timing(1280x768,WXGA).

8. DC/DC Converter block

DC/DC Converter convert the input 12V, 24V to proper

2.5V, 3.3V, 5V, 1.8V for main control system.
For shooting heat trouble, we use the DC/DC
converting IC.

9. Caption/V-CHIP block -Only U.S.A

This block is composed of M37136(U202) and
peripheral devices. M37136 IC is useful for channel
selection system for TV with a closed caption decoder.
It receives text information signal and displays text
information through text receiver decoder. It called
multi-text broadcast.

10. Power Supply Block

This Block generates DC Voltages(12V, 24V) to Main
Control system from AC Power(100-240 V, 50/60 Hz,

1.0 A).
This Circuit contains PFC(Power Factor correction)
circuit.
The Minimum of Power efficiency is about 75%.

- 14 -

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 30 minutes.

• Alignment appliances and tools.

- IBM compatible PC

- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)

- Oscilloscope.

- White Balance Meter. (CA-110)

1. Adjustment Start

1) Display any pattern at any Mode.

2) Run alignment program for L3020AL 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. DDC Data Write Procedure-Analog

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

2) Run alignment program for L3020AL on the IBM
compatible PC.

3) Select EEPROM → Analog EDID write command
and Enter.

4) This will write the Analog EDID data to EEPROM.

3. DDC Data Write Procedure-Digital

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

2) Run alignment program for L3020AL on the IBM
compatible PC.

3) Select EEPROM → Digital EDID write command
and Enter.

4) This will write the Digital EDID data to EEPROM.

DVI-D Connector

RS-232C

EXT.

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

5V

E

F

A

B

C

15

10
5

5

69

1

1

1

14

13

25

6

5V

5V

4.7K

4.7K

4.7K

74LS06

74LS06

OFF ON

OFF

ON

11

Figure 1. Cable Connection