LG Flatron L1511S, LB501K-GL Service Manual

COLOR MONIT OR

SER VICE MANUAL

CHASSIS NO. : CL-32
F ACT OR Y MODEL: LB501K

MODEL: L1511S (LB501K-GL)

CAUTION

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

MENU

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CONTENTS

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

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

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

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

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

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

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

SPECIFICATIONS

1. LCD CHARACTERISTICS

Type : TFT XGA LCD Module
Size : 352.0(H) x 263.5(V) x 14.0(T)
Pixel Pitch : 0.297mm x 0.297mm
Color Depth :

Active Video Area : 15.0inch

Surface Treatment : Anti-Glare, Hard Coating (3H)
Backlight Unit : Top/Bottom edge side 2CCFL
Electrical Interface : LVDS interface

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio

Left : 55° min. Right : 55° min.
Top : 40° min. Bottom : 40° min.

6bits(with FRC)/ 16M colors

(304.128 x 228.096)

≥

10

ADJUSTMENT ........................................................ 9

TROUBLESHOOTING GUIDE .............................. 10

PRINTED CIRCUIT BOARD................................... 14

EXPLODED VIEW...................................................15

REPLACEMENT PARTS LIST ...............................17

PIN CONFIGURATION............................................20

SCHEMATIC DIAGRAM ........................................ 22

4. POWER SUPPLY

4-1. Power

100~240V, 50/60Hz 0.6A

4-2. Power Consumption

MODE

POWER ON (MAX)

POWER ON (NORMAL)

STAND-BY

SUSPEND

DPMS OFF

H/V SYNC

ON/ON

ON/ON
OFF/ON
ON/OFF

VIDEO

POWER CONSUMPTION
ACTIVE
ACTIVE

OFF
OFF

-

-

less than 30 W
less than 28 W

less than 3 W
less than 3 W

less than 3 W

LED COLOR

GREEN
GREEN
AMBER
AMBER
AMBER

2-2. Luminance

200(min.), 250(typ.) at Center point

:

2-3. Contrast Ratio :250(min.), 350(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 ~ 63kHz
Vertical : 56 ~ 75Hz

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.)

Lamp Life : 30,000 Hours (Min.)

6. DIMENSIONS (with TILT/SWIVEL)

Width : 356mm (14.01'')
Depth : 151.7mm (5.97'')
Height : 359.8mm (14.16'')

7. WEIGHT (with TILT/SWIVEL)

Net. Weight : 4.0kg (8.82 lbs)
Gross Weight : 5.5kg (12.13 lbs)

PRECAUTION

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.

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.

• 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.)

CAUTION

Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.

TIMING CHART

VIDEO

SYNC

B

D

C

F

E

A

MODE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

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)

Sync

Polarity

+

–
–

+

–
–
–
–
–
–
–
–

+
+
+
+
+
+
+
+

–
–
–
–
–
–

+
+

Dot

Clock

25.175

28.322

25.175

30.24

31.5

31.5

36.0

40.0

50.0

49.5

57.2832

65

75

78.75

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

37.861 KHz

72.8 Hz

37.50 KHz

75.0 Hz

35.156KHz

56.25 Hz

37.879 KHz

60.3 Hz

48.077 KHz

72.188 Hz

46.875 KHz

75.0 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

Total

Period

( E )

800
449
900
449
800
525
864
525
832
520
840
500

1024

625

1056

628

1040

666

1056

625

1152

667

1344

806

1328

806

1312

800

Video

Active

Time ( A )

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

1024

768

1024

768

1024

768

Blanking

Time

( B )

160

99

180

49

160

45

224

45

192

40

200

20

224

25

256

28

240

66

256

25

320

43

320

38

304

38

288

32

Sync

Duration

( D )

96

2

108

2

96

2

64

3

40

3

64

3

72

2

128

4

120

6

80

3

64

3

136

6

136

6

96

3

Back

Porch

( F )

48
60
55
34
48
33
96
39

128

28

120

16

128

22
88
23
64
23

160

21

224

39

160

29

144

29

176

28

Front

Porch

( C )

16
37
17
13
16
10
64

3

24

9

16

1

24

1

40

1
56
37
16

1
32

1
24

3
24

3
16

1

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

832 x 624

(MAC)

1024 x 768

1024 x 768

1024 x 768

OPERATING INSTRUCTIONS

100

100

PROCESSING

AUTO CONFIGURATION

FRONT VIEW

MENU

See front control panel

REAR VIEW

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Power Connector

D-Sub Signal Connector

Front Control Panel

1. Power Button

Use this button to turn the display on or off.

<Power (DPMS) Indicator>

This Indicator lights up green when the display
operates normally. If the display is in DPM (Energy
Saving) mode, this indicator color changes to
amber.

2. Menu Button

Use this button to enter or exit the On Screen
Display.

3. Button

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

1142 3

AUTO/SELECT Button

4.

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

When adjusting your display settings, always
press the AUTO/SELECT button before entering
the On Screen Display(OSD). This will
automatically adjust your display image to the
ideal settings for the current screen resolution
size (display mode).

The best display mode is 1024x768.

Bring up Contrast and

Brightness adjustment.

WIRING DIAGRAM

J706

J702

J1

J705

CN2

CN3

Connector Ass’y :
P/N: 6631T11016C

Connector Ass’y :
P/N: 6631T20008U

EEPROM

24LC16

ADC/PLL/Scaler

(GMZAN2)

MICOM

(MTV312)

Schmitt Trigger

(74HCT14A)

Panel

Interface

20 Pin

Connector

RGB

H.V

D­Sub
15P

E-DDC

Control

SCLK
SDATA

CON

8P

3.3VD

3.3V_PL

Module Power 3.3V

3.3V_PL3.3VD

5VR

3.3V_AD

Regulator

BA033

Regulator

BA033

3.3V_A

+3.3V

Regulator

BA033

Hsync2 Vsync2

Hsyncm
Vsyncm

2.5V_A 2.5V_D

Regulator

RC117

+2.5V_A

2.5V_D

5VR

LVDS

Filter

BD

SMPS

5VR

CON 8P

Inverter block

12VS

LIPS

CON 2P

EEPROM

24LC02

24 Bit

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

Inverter on/off

DIMADJ

CON 2P

PWM

Controller

DESCRIPTION OF BLOCK DIAGRAM

1. Scaler One chip IC(GMZAN-2, U201)

GMZAN-2 (U201) is one chip IC which it supports four internal function blocks of Video Amp, PLL,
A/D converter and Video processor.
Video signal (0.7Vp.p) clamped through C207, 208, 209 with matching IC’s proper cut off voltage.
This signal is processed as a proper 8 bit digital signal by U201’s amplifying, phase locking, A/D converting,

and scaling operations.
U201 outputs 24bit RGB data and control signals(Clock, Horizontal and Vertical sync, and Data Enable)
as LVDS IC’s input signals.

2. System Controller (Microprocessor) Circuit

1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input

from signal source.

2) Microprocessor (U501) carries out power control by sending power-down trigger signal to each IC.

3) Microprocessor (U501) communicates with EEPROM (U502), and GMZAN-2 (U201)

through IIC(2 lines) or 4 bit bus line. It makes all devices operated properly.

4) Microprocessor (U501) let User adjust screen by OSD function.

3. LVDS(Low Voltage Differential Signal, U411)

LVDS transmitter (U411) delivers digital signal to the receiver inside LCD module by method of abstraction.
The abstracted signals are pairs of RIN0+-, RIN1+-, RIN2+-, RIN3+-, and RCLKIN+- of which voltage swing
is 0.5V each.
When SHUTON pin’s input is High, transmitter goes to power down mode.

4. DC/DC block

This block is composed of regulators which supplies 2.5V and 3.3V.
Each regulator’s source power is 5VR from LIPS(LCD Inverter and Power Supply) block.
U806 supplies 2.5VD and 2.5VA and U802 supplies 3.3VD, 3.3V_AD, and 3.3V_PL powers to GMZAN-2’s
internal PLL, ADC, Pre-amp, and scaler by dropping down 5VR.
U805 supplies MODPWR-3.3V for LCD module’s operation by dropping down 5VR.

5. LIPS Block (LCD Inverter and Power Supply)

This block supplies DC voltages of 5VS to interface board and 12V to inverter by converting AC input voltage
of 100~240Vac.
Converting method is SMPS(Switching Mode Power Supply).
Inverter on/off signal from microprocessor makes inverter turned on or off .
DIMADJ signal from microprocessor does inverter’s current adjustment for Brightness control.

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

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

Video Signal
Generator

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 LB501K on the IBM
compatible PC.

2) Select EEPROM All Init. command and Enter.

3) Display cross hatch pattern at Mode 1.

4) Select EDID WRITE command and Enter.

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

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