Monitor FLATRON LB575E Schematic

SPECIFICATIONS

- 2 -

1. LCD CHARACTERISTICS

Type : TFT XGA LCD
Size : 15 inch (38.10cm)
Pixel Pitch : 0.297mm x 0.297mm
Pixel Format : 1024 x 768 pixels (XGA)

RGB Stripe Arrangement
Color Depth : 6-bit, color(18bits)
Active Video Area : 304.1mm x 228.1mm
Surface Treatment : Anti-Glare, Hard Coating (3H)
Backlight Unit : Four-CCFL (Cold Cathode

Fluorescent Lamp)

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

≥

10
Left : 65° typ., 50° min.
Right : 65° typ., 50° min.
Top : 45° typ., 30°min.
Bottom : 60° typ., 45° min.

2-2. Luminance : 220 cd/m

2

typ.

2-3. Angle at Half Luminance

Left : 50° min.
Right : 50° min.
Top : 45° min.
Bottom : 30° min.

2-4. Contrast Ratio : 400:1 (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 : 31 ~ 69kHz
Vertical : 56 ~ 85Hz

4. POWER SUPPLY

4-1. Power Adaptor

Input : AC 100~240V, 50/60Hz 1.2A-0.6A
Output : DC 24V 1.5A

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 : 394 mm (15.51'') +

Speaker: 64+64mm
Depth : 161.8 mm (6.37'')
Height : 378.7 mm (14.91'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 5.1kg (11.25 lbs) + Speaker: 1 kg
Gross Weight : 8.2kg (18.08 lbs)

8. AUDIO (OPTION)

Input : Max 700mVrms
S/N : More than 43dB (at 50mW output, 1kHz)
Distortion : Less than 2% (at 50mW output, 1kHz)
Amp Output : 1W+1W (at 1 kHz, THD 20%)
Cross-talk : More than 30dB (at 50mW output, 1kHz)

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 36 W

less than 3 W
less than 3 W

less than 3 W
less than 3 W

LED COLOR

GREEN
ORANGE
ORANGE
ORANGE

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 LG 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: 6913TZZ001D)

Bottom (Lower) Backlight Ass’y

(P/N: 6913TZZ001E)

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

28.322

25.175

30.24

31.5

36.0

36.0

40.0

50.0

49.5

56.25

57.2832

65

75

78.75

95.50

Frequency

31.468 KHz

70.0 Hz

31.468 KHz

70.0 Hz

31.469 KHz

60.0 Hz

35.00 KHz

66.67 Hz

37.50 KHz

75.0 Hz

43.27 KHz

85.0 Hz

35.156 KHz

56.25 Hz

37.879 KHz

60.3 Hz

48.077 KHz

72.188 Hz

46.875 KHz

75.0 Hz

53.670 KHz

85.06 Hz

49.725 KHz

74.55 Hz

48.363 KHz

60.0 Hz

56.476 KHz

70.0 Hz

60.023 KHz

75.0 Hz

68.670 KHz

85.0 Hz

Resolution

640 x 350

720 x 400

(TEXT)

640 x 480

640 x 480

640 x 480

640 x 480

800 x 600

800 x 600

800 x 600

800 x 600

800 x 600

832 x 624

(MAC)

1024 x 768

1024 x 768

1024 x 768

1024 x 768

Total

Period

( E )

800
449
900
449
800
525
864
525
840
500
832
509

1024

625

1056

628

1040

666

1056

625

1048

631

1152

667

1344

806

1328

806

1312

800

1376

808

Video

Active

Time ( A )

640
350
720
400
640
480
640
480
640
480
640
480
800
600
800
600
800
600
800
600
800
600
832
624

1024

768

1024

768

1204

768

1024

768

Blanking

Time

( B )

160

99

180

49

160

45

224

45

200

20

192

29

224

25

256

28

240

66

256

25

248

31

320

43

320

38

304

38

288

32

352

40

Sync

Duration

( D )

96

2

108

2

96

2

64

3

64

3

56

3

72

2

128

4

120

6

80

3

64

3

64

3

136

6

136

6

96

3

96

3

Back

Porch

( F )

48
60
55
34
48
33
96
39

120

16
80
25

128

22
88
23
64
23

160

21

152

27

224

39

160

29

144

29

176

28

208

36

Front

Porch

( C )

16
37
17
13
16
10
64

3

16

1

56

1

24

1

40

1
56
37
16

1
32

1
32

1
24

3
24

3
16

1
48

1

MODE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

- 8 -

CONTROL LOCATIONS

NO.

1

2

3

4

5

6

7

Control Function

POWER SWITCH

SET

LEFT

UP

DOWN

RIGHT

OSD

MAIN PCB

CONTROL PCB

1

234567

ADJUSTMENT

- 14 -

24V

AUDIO
DC OUT

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

E

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

F

F

A

A

B

B

C

C

15

10

5

5

69

1

1

1

14

13

25

6

5V

5V

5V

4.7K

4.7K

4.7K

74LS06

74LS06

OFF ON

OFF

ON

11

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 575MS or 575MM on the
IBMcompatible 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.

3. DDC Data Write Procedure

1) Use this procedure only when there is some

probelm on EDID data.

2) Select EEPROM → EDID Write command and

Enter.

3) This will write the EDID data to EEPROM.

BLOCK DIAGRAM

- 11 -

POWER CORD

15-pin D-SUB SIGNAL CABLE

POWER

SUPPLY

CONTROL PCB

INVERTER PCB

MAIN LOGIC

PCB

LCD MODULE

System Block Diagram

- 12 -

18bit(R/ G/B)

Video

Digital

Video Processor

MX88L284

R

G

B

HS/VS

Dot clock

System Controller

MC68HC05BD48

Power Connector

DC/D C

Converter

(L4973D5.1)

REG

REG

REG

REG

REG

Analog

Switch

+5V

+5V Module

I2C

Control

EEPROM

(24LC08B)

Link Connector

Control

Signal

SD A/SCL

15PIN

3 ROW

D-SUB

PRE AMP+ ADC

+PLL

TDA8752B

8 BI T

8 BI T

8 BI T

H-sync

Clamp

Buffer

+24V GND

+5VST

+5VPLL

+3.3VD2

+3.3VD

+5V

+5V

+5VPLL

+5VANA

5VST

+3.3VD

V-sync

ADDR

DA TA

10

16

/RD

/WR

MEMORY

2M Byte * 2

I2C

+3.3VD2

H-sync

V-sync

Communication

8bit

BLOCK DIAGRAM

- 13 -

DESCRIPTION OF BLOCK DIAGRAM

1. Video Amp & PLL & A/D Converter Circuit

TDA8752 (U1) is one chip IC which it supports three function block of Video Amp, PLL and A/D converter.
Video signal (0.7Vp.p) clamped through C6, 7, 16 inputs to U18’s R, G, and B pins. The signal level is 0.7Vac added
3Vdc. This signal is processed as a proper 8 bit digital signal for input of MX88L284 (U5) by U1’s amplifying, phase
locking, and A/D converting operation.
U1 generates clock and horizontal sync for MX88L284 (U5) with D-sub (J1)’s input horizontal sync signal.
MX88L284 (U5)’s clamp output makes U1 keep video signal’s black level constantly regardless of various input video
signals.

2. Macronix Circuit (Scaler chip)

The MX88L284 (U5) gets the video signal converted analog to digital from U1, and carries out four function of image
processing that interpolates input signal less than 1024x768 resolution to that of 1024x768 resolution, displays one to
one image without interpolation, mixes OSD(On Screen Display) signal by interfacing with internal OSD IC, and
controls two memories(U6, 7) as frame converter.
U5 outputs signals of HSYNC-OUT, VSYNC-OUT, DEN, CLKA-ODD, and each 8 bit R, G, B to LCD module.

3. Memory Circuit

2M byte SDRAM(U6, 7) is used as a frame converter for supporting up to 85 Hz frame rate and controlled by
MX88L284(U5).
The control signals are CKA, CLK, UDOM, LDOM, /WE, /CAS, /RAS, /CS, /BA.

4. System Controller (Microprocessor) Circuit

1) Microprocessor (U4) distinguishes polarity and frequency by calculating horizontal and vertical sync input from
signal source.

2) Microprocessor (U4) carries out power control by sending power-down trigger signal to each IC.
U1, U5, and U13 has PD(Power-down) pin which operates at active-low or high.
It also outputs signal to turn inverter on and off for lamp control.

3) Microprocessor (U4) communicates with EEPROM (U3), TDA8752 (U1), and MX88L284 (U5) through IIC(2 lines)
or 8 bit bus line. It makes all devices operated properly with communication channel.

4) Microprocessor (U4) let User adjust screen by each OSD function.

5. DC/ DC Converter

This circuit supplies DC power for each device needing DC voltage of+3.3VD, +3.3VD2, +5V, 5VPLL, and 5VST.
L4973D5.1(U13), the DC/DC controller IC converts input 24Vdc into +5Vdc and +3.3Vdc with peripheral circuit
composed of Transformer (TRANS1), condensing components (ZD5, D6, C201, C26, C72, C73) and Regulators
(U17, U2, U24). 5VST is supplied for Microprocessor through regulators (U10, U11, U22).
+3.3VMOD for LCD module power are switched by U12, switching FET, controlled by Microprocessor.

SCHEMATIC DIAGRAM

- 42 -

1. TDA8752 (PRE-AMP/PLL/ADC)

- 43 -

2. VIDEO PROCESS

- 44 -

3. OUTPUT CON.

- 45 -

4. MEMORY

- 46 -

5. MICOM

- 47 -

6. POWER GEN.

- 48 -

7. CONNECTOR & JACKS

- 8 -

WIRING DIAGRAM

CN1

CN2

P4

J1

J3

CN3

J4

J2

J11

J10

J3

J4

EXPLODED VIEW

1

2

3

4

5

6

7

9

10

11

13

12

15

16

14

8

18

17

EXPLODED VIEW PARTS LIST

Ref. No.

1

2
3
4
5
6
7

8

9

10

11

12
13
14
15
16
17
18

Part No.

3091TKL019T
3091TKL019D
6304TMT150A
4810TKK124A
6633TZA003C
4951TKS055B
6871TMT170A
4950TKK205A
6871TKT013A
6871TKT015A
6871TST158A
6871TST157A
3809TKL010G
3809TKL010F
1BWF0302816

332-105G
3043TKK057A
6634TBZ009B
6866TD9001F
3551TKS033A
3551TKS032A

Description

CABINET ASS’Y FOR 575MM
CABINET ASS’Y FOR 575MS
LCD MODULE
BRACKET (SUPPORTER INVERTER)
INVERTER ASS’Y
MAIN FRAME ASS’Y
MAIN PCB ASS’Y
METAL REAR ASS’Y
INTERFACE ASS’Y FOR 575MS
INTERFACE ASS’Y FOR 575MM
POWER KEY TOTAL
CONTROL PCB ASS’Y
BACK COVER ASS’Y FOR 575MM
BACK COVER ASS’Y FOR 575MS
SCREW
SCREW PVS+4X10
TILT SWIVEL ASS’Y
ADAPTER, AC-DC 100~240V, 24V, 1.5A
SIGNAL CABLE
SPEAKER ASS’Y (LEFT) - FOR 575MM
SPEAKER ASS’Y (RIGHT) - FOR 575MM

Q'ty

1

1
1
1
1
1
1

1

1
1

1

4
2
1
1
1
1
1

Material

LGC ABS HF350U

LGC ABS HF350U

LGC HIPS 60HR