LG StudioWorks 570LE User manual

++
COLOR MONITOR
SERVICE 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-06
MODEL: StudioWorks 570LE / 570LS, LB570BZ
ID LABEL : LB570D-EA / LB570E-EA / LB570D-EN
Same looking with New Chassis
Issue Date: JULY 2000

The Discrimination of Same Model Name
Chassis No.: CL-06
Factory ID:GG
MODEL NO. : LB570BE
POWER : DC 24V
1.2A
SERIAL NO. : 007KG00001
MANUFACTURED : JULY 2000
FCC ID : BEJLB570B
3850TIZ254A
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions : (1) this
device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.
This Class B digital apparatus meets all requirements
of the Canadian Interference Causing Equipment
Regulations. Cet appareil numérique de Ia classe B
respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
LISTED 59B9
ITE E82982 LR53545
MADE IN KOREA
LG Electronics Inc.
LG Twin Towers, 20, Yoido-Dong,
Youngdungpo-Gu, Seoul, 150-721, Korea.
StudioWorks 570LE
Chassis No.: CL-06
Factory ID:GG
MODEL NO. : LB570D -EA
POWER : DC 24V
1.2A
SERIAL NO. : 007KG00001
MANUFACTURED : JULY 2000
FCC ID : BEJLB570C
3850TIZ254A
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions : (1) this
device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.
This Class B digital apparatus meets all requirements
of the Canadian Interference Causing Equipment
Regulations. Cet appareil numérique de Ia classe B
respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
LISTED 59B9
ITE E82982 LR53545
MADE IN KOREA
LG Electronics Inc.
LG Twin Towers, 20, Yoido-Dong,
Youngdungpo-Gu, Seoul, 150-721, Korea.
StudioWorks 570LE
Model No: LB570BE
Manufactured: Before JULY 2000 Model No: LB570D-EA
Manufactured: After JULY 2000
Chassis No.: CL-06
Factory ID:GG
MODEL NO. : LB570CE
POWER : DC 24V
1.2A
SERIAL NO. : 007KG00001
MANUFACTURED : JULY 2000
FCC ID : BEJLB570C
3850TIZ254A
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions : (1) this
device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.
This Class B digital apparatus meets all requirements
of the Canadian Interference Causing Equipment
Regulations. Cet appareil numérique de Ia classe B
respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
LISTED 59B9
ITE E82982 LR53545
MADE IN KOREA
LG Electronics Inc.
LG Twin Towers, 20, Yoido-Dong,
Youngdungpo-Gu, Seoul, 150-721, Korea.
StudioWorks 570LS
Chassis No.: CL-06
Factory ID:GG
MODEL NO. : LB570E-EA
POWER : DC 24V
1.2A
SERIAL NO. : 007KG00001
MANUFACTURED : JULY 2000
FCC ID : BEJLB570C
3850TIZ254A
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions : (1) this
device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.
This Class B digital apparatus meets all requirements
of the Canadian Interference Causing Equipment
Regulations. Cet appareil numérique de Ia classe B
respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
LISTED 59B9
ITE E82982 LR53545
MADE IN KOREA
LG Electronics Inc.
LG Twin Towers, 20, Yoido-Dong,
Youngdungpo-Gu, Seoul, 150-721, Korea.
StudioWorks 570LS
Model No: LB570CE
Manufactured: Before JULY 2000 Model No: LB570E-EA
Manufactured: After JULY 2000
• StudioWorks 570LE
• StudioWorks 570LS

CONTENTS
SPECIFICATIONS
- 2 -
1. LCD CHARACTERISTICS
Type : Color Active Matrix TFT LCD
Size : 15.1inch (38.35cm)
Pixel Pitch : 0.3mm x 0.3mm
Pixel Format : 1024 x 768 pixels (XGA)
RGB Stripe Arrangement
Color Depth : 8-bit, 16 million colors (570LE)
6-bit, 262,000 colors (570LS)
Active Video Area : 307mm x 230mm
Surface Treatment : Anti-Glare, Hard Coating (3H)
Backlight Unit : Two-CCFL (Cold Cathode
Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥ 10
Left : 60° typ., 55° min.
Right : 60° typ., 55° min.
Top : 45° typ., 40° min.
Bottom : 45° typ., 40° min.
2-2. Luminance : 200 cd/m2typ.
2-3. Angle at Half Luminance
Left : 50° min.
Right : 50° min.
Top : 35° min.
Bottom : 35° min.
2-4. Contrast Ratio : 200° 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
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 : 405.2mm (15.95'')
Depth : 182.4mm (7.18'')
Height : 361.6mm (14.24'')
7. WEIGHT (with TILT/SWIVEL)
Net. Weight : 5.2kg (11.46 lbs)
Gross Weight : 7.1kg (15.65 lbs)
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
CONTROL LOCATIONS ......................................... 7
WIRING DIAGRAM ................................................. 7
DISASSEMBLY ....................................................... 8
BLOCK DIAGRAM ..................................... 10, 11, 13
DESCRIPTION OF BLOCK DIAGRAM..............12, 14
ADJUSTMENT ...................................................... 15
TROUBLESHOOTING GUIDE .............................. 16
PRINTED CIRCUIT BOARD................................... 21
EXPLODED VIEW...................................................24
REPLACEMENT PARTS LIST ...............................26
PIN CONFIGURATION............................................33
SCHEMATIC DIAGRAM......................................... 43
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
CFE
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
940
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

OPERATING INSTRUCTIONS
- 5 -
FRONT VIEW REAR VIEW
Front Control Panel
OSD ON/OFF
Button OSD Selection
Buttons
ID Label
Power (DPMS) Indicator
Power (DPMS) Indicator
+ +
1. Power ON/OFF Button
This button is used to turn the monitor ON and 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 orange.
3. OSD ON/OFF Button
Use this button to start and exit from the On-Screen-
Display(OSD).
4. OSD Selection Buttons
Use these buttons to select (highlighting) an OSD
icon.
5. OSD Adjustment Buttons
Use these buttons for adjusting the level of the
selected item.
6. Brightness Control Buttons
Use these buttons for adjusting
the brightness of screen.
7. Auto Button
This button is for the automatic adjustment
of the screen position, clock,
and clock phase.
++
Power ON/OFF Button
Power ON/OFF Button
4
3
OSD Adjustment
Buttons
52
1
Auto Button
7
Brightness
Control Buttons
6
Front Control Panel
+
+
Brightness
MaxMin
Auto Adjust
NO YES
SEL : ENT : -+
Power Input Socket
15-pin D-Sub
Signal Connector

Self Diagnosis
This monitor has a SELF DIAGNOSIS OSD feature that is
pops up when the signal cable is not connected between a
PC and a monitor. The message will be highlighted
as below.
Mode Recall
Image Size
Information
Color Select
OSD Position
Language Select
Contrast
V Position
Clock
OSD Time
Clock Phase
H Position
On-Screen-Display (OSD) Control
To adjust an image size, position and operating
parameters are quick and easy with the On-Screen-
Display control system.
1. To start the OSD, press OSD ON/OFF button. ( )
2.
Select an OSD icon with OSD Selection buttons. ( )
3. Adjust the level of the selected item with OSD Adjustment
buttons. ( )
4.To exit the OSD, press OSD ON/OFF button ( ) once
again.
Listed below are icons, icon names and icon descriptions
of the OSD menu.
- 6 -
ADJ: –+
SEL:
Contrast
MaxMin
Contrast
H Position
ADJ: –+
SEL:
MaxMin
ADJ: –+
SEL:
V Position
MaxMin
ADJ: –+
SEL:
CClock
MaxMin
ADJ: –+
SEL:
Clock Phase
MaxMin
ADJ: –+
SEL:
OSD TIME
50 Seconds
To adjust the screen
contrast level.
+
To move the image
left or right.
To move the image
up or down.
To adjust the horizontal
size of the image.
To adjust the focus
of the display.
ADJ: –+
SEL:
MAIN: –+
SEL:
9300K 6500K User
9300K 6500K User
R
G
B
Recall : –+
ADJ: –+
SEL:
OSD Position
H Position
V Position
MAIN: –+
SEL:
Language
EN DE FR ES IT
[English]
MAIN: –+
MODE:
1024X768/75Hz
Preset Mode: 14
User Mode: 0
Information
To select OSD display
time. (5~100 seconds)
To adjust OSD image’s
horizontal and vertical
position.
To choose one of the
five languages for the
OSD menu.
To inform preset and
user mode data.
This item provides
information about the
stored video modes.
OSD
To select color
temperature or set
color level;
9300K / 6500K / User.
MAIN: –+
ENT:
YES
Mode Recall
MAIN: –+
SEL:
Full 1:1
Image Size
This control will reset the
image to factory preset
mode.
This function displays
the image in its original
size or enlarged size so
as to fit in the full screen
of the LCD Panel.
Check Signal Cable

- 7 -
CONTROL LOCATIONS
MAIN PCB
CONTROL PCB
123456789
NO.
1
2
3
4
5
6
7
8
9
Ref. No.
S9
S1
S2
S3
S4
S5
S6
S7
S8
Control Function
POWER SWITCH
AUTO BUTTON
BRIGHTNESS +
BRIGHTNESS -
OSD +
OSD -
OSD RIGHT
OSD LEFT
OSD ON/OFF
WIRING DIAGRAM
CN1
CN2
P1
P2
J7
CN3
J8
J2
P3

- 8 -
DISASSEMBLY
(a)
1. TILT/SWIVEL REMOVAL
(1) Remove four screws (a).
(2) Remove the Tilt/swivel.
2. BACK COVER REMOVAL
(1) Remove four screws (a) from the Back Cover.
(2) Remove the Back Cover.
3. TOP SHIELD & INVERTER SHIELD REMOVAL
(1) Remove six screws (a).
(2) Remove the Top Shield.
(3) Remove two screws (b).
(4) Release two latchs (c).
(5) Remove the Inverter Shield.
(b)
(b)
(a)
(a)
(a)
(a)
(a)
(c)
(a)
(a)
(a)
Back Cover

- 9 -
5. BACKLIGHT REMOVAL
(1) Remove two screws (a).
(2) Remove the Backlight from the LCD Module.
6. LCD MODULE REMOVAL
(1) Remove four screws (a).
(2) Separate the LCD Module from the Main Frame.
Bottom (Lower) Backlight Ass’y
Top (Upper) Backlight Ass’yLCD Module
(a)
(a)
(a)
(a)
(a)
(a)
(a)
(a)
CN2
J5
CN3
J2
J3
(a)
(d)
(d)
(d)
(d)
(b)
(b)
(a)
(c)
(c)
Front Cabinet
4. INVERTER, POWER, CONTROL,
AND MAIN PCB ASSEMBLY REMOVAL
(1) Disconnect J8, J2 and J7.
(2) Remove four screws (a).
(3) Remove the Main PCB Ass’y.
(4) Disconnect CN2 and CN3.
(5) Remove two screws (b).
(6) Remove the Inverter PCB Ass’y.
(7) Remove two screws (c).
(8)
Remove the Control and Power PCB Ass’y.
(9) Remove four screws (b).
(10) Remove the Front Cabinet.

BLOCK DIAGRAM
- 10 -
POWER CORD
15-pin D-SUB SIGNAL CABLE
POWER
SUPPLY
CONTROL PCB
INVERTER PCB
MAIN LOGIC
PCB
LCD MODULE
System Block Diagram

- 11 -
BLOCK DIAGRAM FOR LB570D (570LE)
24bit Video
Digital Video Processor
MX88L284
R
G
B HS/VS
Dot clock
System Controller MC68HC05BD32 Power Connector
DC/D C Converter (L4973D5.1)
REG REG
REG
REG
REG
Analog Switch
+5V +5V Module
I2C
Control
EEPROM (24LC08B)
Link Connector
Panel Link Transmitter ( Sil 100 )
Control Signal
TMDS
SDA/SCL
15PIN 3 ROW D-SUB
PRE AMP+ ADC +PLL TDA8752B
8 BIT
8 BIT
8 BIT
H-sync
Clamp
Buffer +24V GND
+5VST
+5VPLL
+3.3VD2
+3.3VD
+5V
+5V +5VPLL +5VANA
5VST
+3.3VD
+3.3VD
V-sync
ADDR
DA TA
10 16
/RD
/WR
MEMORY 2M Byte * 2
I2C
+3.3VD2
H-sync
V-sync
Control
Communication
8bit

DESCRIPTION OF BLOCK DIAGRAM FOR LB570D (570LE)
- 12 -
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 transmitter
IC (U16).
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. Panel-Link Circuit
Panel link transmitter (U16) delivers digital signal to the receiver inside LCD module by method of abstraction.
The abstracted signals are pairs of TX0+-, TX1+-, TX2+-, TXC+- of which voltage swing is 0.5V each.
Its swing is similar to LVDS (Low Voltage Differential Signal).
Transmitter (U16) gets signals of HSYNC-OUT, VSYNC-OUT, DEN, CLKA-ODD from U5, and outputs TMDS
(Transition Minimized Differential Signal) through TX pins.
When PD pin’s input is low, transmitter goes to power down mode.
5. 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, U16, 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.
6. 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 (U11, U22).
+5VMOD for LCD module power are switched by U12, switching FET, controlled by Microprocessor.

- 13 -
BLOCK DIAGRAM FOR LB570E (570LS)

- 14 -
DESCRIPTION OF BLOCK DIAGRAM FOR LB570E (570LS)
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.

ADJUSTMENT
- 15 -
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
1510
5
569
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 570LE-New or 570LS-New
on the IBM compatible 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 auto-
matically 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.

TROUBLESHOOTING GUIDE
- 16 -
1. NO POWER
CHECK U22, U11.
CHECK
U22 PIN5 VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK ADAPTER,
AND FIND OUT
A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J1’S
VOLTAGE
(24V) ?
NO
CHECK T1’S PRIMARY
COIL (OPEN CHECK)
CHECK
U17 Voltage
(5V) ?
NO
U13’S PIN11
0V ?
CHECK U13, AND
CHECK 5VA LINE
CHECK IIC LINE
CONNECTION
(U3, U1)
CHECK U4’S VCC,
XTAL, RESET
IS U5 PIN12
VOLTAGE REPEATED
AS PULSE SHAPE ? NO
YES
YES
YES
NO YES
NO PROBLEM
NO
CHECK KEY CONTROL
CONNECTOR ROUTINE

- 17 -
2. NO RASTER (OSD IS NOT DISPLAYED) –INVERTER
CHECK MICOM INV
ON/OFF PORT.
J4 PIN5
5V? NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK ADAPTER
J4 PIN10
24V? NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT
J4 PIN1
5V? NO
REPLACE
INVERTER ASS’Y
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL.
(CONTACT PROBE TO
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
NO
REPLACE CCFL LAMP
IN THE LCD MODULE
YES
YES
YES
YES

- 18 -
1. CHECK PIN34, 35
SOLDERING CONDITION
2. CHECK X1
3. TROUBLE IN U5
U5
POWER PINS
3.3V?
NO CHECK U2, U24
U5 PIN34, 35
OSCILLATE AS 14.3M? NO
CHECK U5’S SOLDERING
CONDITION AND
CHECK CONNECTION LINE
FROM U5 TO J5
NO
TROUBLE IN CABLE
OR LCD MODULE
TROUBLE IN CABLE
OR LCD MODULE
CHECK U12, U10
CHECK SOLDERING
STATE OF U16
J5 PIN40
3.3V?
IS APPEAR LOW
VOLTAGE SIGNAL
AT J4?
YES
YES
NO
NO
CHECK U12
J4 PIN4
5V? NO
YES
YES
YES
570LS
570LE
YES
3. NO RASTER (OSD IS NOT DISPLAYED) –MX88L284
NO RASTER
(OSD IS NOT DISPLAYED)
J5
PIN2 IS 65MHz CLOCK?
PIN4 IS 48KHz H-SYNC?
PIN5 IS 60Hz V-SYNC?
PIN37 IS 48KHz H-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?

- 19 -
CHECK U101
U1 PIN3
2.5V? NO
CHECK U17, +5V
U1
POWER PIN
5V?
NO
1. CHECK PC
2. CHECK SIGNAL CABLE
& D-SUB CONNECTOR
LINE
CHECK
R,G,B INPUT?
U1 PIN 12, 20, 28 NO
CHECK IIC LINE
CHECK
IIC PULSE ?
U1 PIN32, 33
NO
CHECK H-SYNC LINE
(D-SUB→U8→MICOM
→U1 PIN95)
CHECK
CKREF(H-SYNC) INPUT?
U1 PIN94
NO
CHECK CKREF INPUT
CHECK
H-SYNC INPUT?
U1 PIN90?
NO
YES
YES
YES
YES
YES
YES
YES
NO RASTER
(OSD IS DISPLAYED)
4. NO RASTER (OSD IS DISPLAYED) –TDA8752BH