LG Flatron L1715S 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-43
MODEL: L1715S (L1715SL-AL**R)
L1716S (L1716SL-AL**R)
( ) **Same model for Service

1. LCD CHARACTERISTICS
Type : TFT SXGA LCD
Size : 17 inch
Pixel Pitch : 0.264 (H) x 0.264 (V)
Color Depth : 16.2M colors
Electrical Interface : LVDS
Surface Treatment : Hard-coating(3H)
Operating Mode : Normally White
Backlight Unit : Top/Bottom edge side 4-CCFL
(Cold Cathode Fluorescent Lamp)
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
≥
10
Left : -60° min., -70°(Typ) Right : +60° min., +70°(Typ)
Top :+50° min., +60°(Typ) Bottom : -45°min., -60°(Typ)
2-2. Luminance : 200(min), 250(Typ)
2-3. Contrast Ratio : 300(min), 400(Typ)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync,
SOG (Sync On Green)
Composite Sync
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 ~ 83kHz
Vertical : 56 ~ 75Hz
4
. Max. Resolution
Analog : 1280 x 1024 / 75Hz
5. POWER SUPPLY
5-1. Power
: AC 100~240V, 50/60Hz , 1.0A
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature: 10°C~35°C (50°F~95°F)
(Ambient)
6-2. Relative Humidity : 10%~80%
(Non-condensing)
6-3. MTBF : 50,000 Hours(Min)
7. DIMENSIONS (with TILT/SWIVEL)
(Full Up Position)
Width : 386 mm (15.20'')
Depth : 152 mm (5.98'')
Height : 372 mm (14.65'')
(Foldedl Position)
Width : 386 mm (15.20'')
Depth : 66 mm (2.60'')
Height : 402 mm (15.83'')
8. WEIGHT (with TILT/SWIVEL)
Net. Weight : 4.3 kg (9.48 lbs)
Gross Weight : 5.7 kg (12.57 lbs)
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
WIRING DIAGRAM ................................................. 6
BLOCK DIAGRAM ................................................... 7
DESCRIPTION OF BLOCK DIAGRAM.....................8
ADJUSTMENT ...................................................... 10
TROUBLESHOOTING GUIDE .............................. 11
PRINTED CIRCUIT BOARD................................... 15
EXPLODED VIEW...................................................19
REPLACEMENT PARTS LIST ...............................21
SCHEMATIC DIAGRAM......................................... 25
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
POWER CONSUMPTION
less than 40 W
less than 2 W
less than 2 W
less than 2 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
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 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
- 4 -
VIDEO
SYNC
B
D
CFE
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–70.8Hz 449 350 37 2 60
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 + 70.09 449 400 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+/–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+/–68.681 1456 1152 32 128 144
V+/–75.062 915 870 3 3 39
H+/–61.805 1504 1152 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
1
2
3
4
5
6
7
8
9
10
11
12
13
25.175
28.321
25.175
31.5
40.0
49.5
57.283
65.0
78.75
100.0
92.978
108.0
135.0
640x350
70Hz
640x480
60Hz
640x480
75Hz
720x400
70Hz
800x600
60Hz
800x600
75Hz
832x624
75Hz
1024x768
60Hz
1024x768
75Hz
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

- 5 -
Bring up Contrast and Brightness adjustment.
:
1. Power ON/OFF Button
Use this button to turn the monitor on or off.
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.
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.
4. SELECT / AUTO Button
Use this button to enter a selection in the On Screen Display.
FRONT VIEW REAR VIEW
OPERATING INSTRUCTIONS
D-Sub Signal
Connect
Front Control Panel
132 4
100
100
When adjusting your display settings,
always press the SELECT/AUTO 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 1280x1024@60Hz.
This function optimizes the brightness, contrast or color
value to the surrounding conditions and settings and
enables you to enjoy the most suitable picture by
adjusting the surroundings (DAY/NIGHT/USER MODE).
• TEXT: For viewing letters
• MOVIE: For viewing movies
• PHOTO: For viewing pictures or the photographs
• USER MODE: This function memorizes the
manual adjustment -Brightness, Contrast and
Color value on the On Screen Display.
See Front Control Panel
Power Connect
L1715S
L1716S
3 1
2 4

J706
J702
J707
CN2 CN1
CN4 CN3
J8
J1
- 6 -
WIRING DIAGRAM
Connector Ass’y P/N:
6631T20024B
Connector Ass’y P/N:
6631T20020Q
Connector Ass’y P/N:
6631T11012W
This function allows you to secure the current control settings, so that they cannot be inadvertently
changed. Press and hold the MENU button and button for 3 seconds: the message “CONTROLS
LOCKED”appears.
You can unlock the OSD controls at any time by pushing the MENU button and button for 3 seconds:
the message “CONTROLS UNLOCKED”will appear.
CONTROLS LOCKED/UNLOCKED
:
MENU and

- 7 -
D-SUB
MST9111
including
(ADC/LVDS/SCALER )
MTV312
Micom
LCD Module
R,G,B differential
LVDS (Low Voltage
Differential Signaling)
LIPS
5V
5V
5V
AC Input
3.3V
Reg. 2.5V
Reg.
5V 5V
R,G,B, H/V Sync
3.3V 2.5V
3.3V 2.5V
BLOCK DIAGRAM

- 8 -
DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part & Display Data Transmitter Part.(MST9111)
This part amplifies the level of video signal for the digital conversion and
converts from the analog video signal to the digital video signal using a pixel clock.
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.
The Scaler gets the video signal converted analog to digital,
interpolates input to 1280 x 1024 resolution signal and outputs 8-bit R, G, B signal to transmitter.
Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip “MST9111”by MSTAR.
This part transmit digital signal from the Scaler to the receiver of module.
2. 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.
3. Power Part
This part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 5V in LIPS Board.
5V is provided for LCD Panel.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.

- 9 -
EMI
COMPONENTS
LINE
100 ~ 240V
INPUT RECTIFIER
AND FILTER ENERGY TRANSFER OUTPUT RECTIFIER AND FILTER
12V
5V
GND
SIGNAL
COLLECTI
ON
PHOTO-
COUPLER
ISOLATION
PWM
CONTROL
CIRCUIT
HVDC 100KHz
PRIMARY SECONDARY
50 ~ 60Hz
Operation description_LIPS
LIPS Board Block Diagram
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
achieve the stabilized 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.

- 10 -
ADJUSTMENT
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
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.
1. Adjustment process for LCD MONITOR
1) Display half window pattern(or mixed white and black pattern)at Mode 8 (1024x768@60Hz).
2) Press the POWER and MENU key at the same time to light monitor, then go to adjustment mode.
3) Press the MENU s/w, next press UP button, you will see adjustment OSD menu.
4) Press the AUTO/SELECT to select the adjustment item first(use the same button to exit)next do the operation to
the relative item.Ex) 17HYDIS is used at 17AU, press right button to select. Press the AUTO/SELECT then
selected proper Module.
5) Press down button to move the place of ADC CAL. Press the AUTO/SELECT to select, right button is pressed for
adjustment.
6) When adjustment is finished, press the POWER key twice to light monitor again. The dajustment ends.
2. Adjustment for EDID
1) Use this procedure only when there is some probelm on EDID data.
2) Connect the D-sub cable.
3) Select EDID →Write EDID[A0] command and Enter.

- 11 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J705
VOLTAGE
PIN5, PIN6 (5V)?
NO
CHECK 5VS LINE
(OPEN CHECK)
CHECK
U501 PIN 8 Voltage
(5V) ?
NO
CHECK IIC LINE
CONNECTION
(U501, U502)
CHECK U201 VCC,
XTAL, RESET
IS U201
PIN114 (3.3V)
VOLTAGE REPEATED
AS PULSE
SHAPE ?
NO
YES
YES NO PROBLEM
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE

- 12 -
2. NO RASTER (OSD IS NOT DISPLAYED) –LIPS
CHECK MICOM INV
ON/OFF PORT.
J705 PIN9
5V? NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK LIPS
J705
PIN5, PIN 6
5V?
NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT
J705 PIN10
5V? NO
LIPS
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

- 13 -
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U201
U201
POWER PIN 8,114
3.3V?
NO CHECK U804
U201
PIN122, 123
OSCILLATE AS
12MHZ?
CHECK CONNECTION LINE
FROM D-SUB TO U501
TROUBLE IN CABLE
OR LCD MODULE
YES
YES
YES
3. NO RASTER (OSD IS NOT DISPLAYED) –MST9111
NO RASTER
(OSD IS NOT DISPLAYED)
U501
PIN43 IS 48KHz H-SYNC?
PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
NO
NO

- 14 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN PC
CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
NO
TROUBLE IN
SIGNAL CABLE
NO
YES
YES
CHECK
R734, R741
(SYNC) ?
CHECK
U501 PIN 24
(0V) ?

PRINTED CIRCUIT BOARD
- 15 -
1. MAIN BOARD (Component Side)
R708
C711 C708
C709
J706
Q703
R709
C710
C803
R812
U802
C828
J704
C821
C822
R769
J705
Q704
R747
R748
U801
1
R744
R745
R811
R801
R802
R804
C804
C829
R749
C832
C818
1
C820
R770
R840
R846
R847
R841
U804
R803
C230
C801
C817
C221
C831
100
C819
C222 C217
90 80
C227
70
U201
J707
1
R735
U502
C516
C760
R842
R848
R844
R845
R843
R849
U803
R511
C225
C226
C219
C802
110
C223C218
60
C727
Q705
R753
R779
C732
R533
R534
R537
Q506
R510
X501
Q503
R535
R532R550
C550
X201
C228 C229
120
R739
C220 J702
50
R502
R750 R751
U501
R501
C512
C502
C503
15
R536C513
10
Q502
C501
C514
5
R592
R593
R204
R205
C211
10
1
C212
C215
20
C207
30
C208
1
40
Q505
R525
R541
20
R581
R571
R531
D707
R530
R580
R570
R520
R504
R509
R590 R591
Q701
R207
R733
R522
C216
A
Q702
R716
R740
C201
C712
C202
C203
C209
C713
C210
C714
1
R528
R529
25
C703
40
D703
R725
R705
R722
ZD702
C505
C715
D706
R717
ZD701
D701D702
R701R703 R706
R202 R203 R208 R209 R210 R240
C205 C206 C232 C233 C240 C231
R201C204
MODEL:L-CHASSIS-ANALOG
P/N :6870T628A11
DATE :2003.02.24
Q504
R515
30
R734
R540 R551
35
A
R707
R741
U702
C707
C731 C730
R723
R724
R726
R727
R523
R524
ZD703 ZD704
C506
J703

- 16 -
2. MAIN BOARD (Solder Side)
1
C214
C224
C213

- 17 -
3. POWER B OARD (Component Side)
4. POWER B OARD (Solder Side)

- 18 -
5. CONTROL BOARD(Component Side)-L1715SL
6. CONTROL BOARD(Solder Side)-L1715SL
7. CONTROL BOARD(Component Side)-L1716SL
8. CONTROL BOARD(Solder Side)-L1716SL

- 19 -
EXPLODED VIEW
1
2
3
4
5
6
7
9
810
11

- 20 -
EXPLODED VIEW PARTS LIST
Ref. No.
1
2
3
4
5
6
7
8
9
10
11
Part No.
3091TKL070A
3091TKL082A
6304FLP058A
3809TKL049A
3043TKK121G
6871TST393A
6871TST428A
6871TMT431D
6871TPT243B
6871TPT241E
6631T11012W
4951TKS105A
4814TKK235A
4814TKK235B
Description
CABINET ASSEMBLY, L1715 BRAND L064 L/GRAY -FLATRON L1715S
CABINET ASSEMBLY, L1716SL BRAND 3090TKL072A CA ASSY -FLATRON L1716S
LCD(LIQUID CRYSTAL DISPLAY) LM170E01-A4 LG PHILPS TFT COLOR 17" TFT LCD
BACK COVER ASSEMBLY, L1715 L050 350U M/GRAY
TILT SWIVEL ASSEMBLY, L1715 350U M/GRAY-WITH B/C
PWB(PCB) ASSEMBLY, SUB, L1515SL CONTROL TOTAL BRAND CL-32 -FLATRON L1715S
PWB(PCB) ASSEMBLY, SUB, L1516SL CONTROL TOTAL BRAND -FLATRON L1716S
PWB(PCB) ASSEMBLY, MAIN, L1715SL ALKRR BRAND CL-43 TOTAL
PWB(PCB) ASSEMBLY, POWER, AI-0019 POWER TOTAL LIEN CHANG L1710SL LIPS FOR HYDIS/LPL
PWB(PCB) ASSEMBLY, POWER, 17" HYDIS(L1710SL) POWER TOTAL SPI FSP026-2PI01
CONNECTOR ASSEMBLY, 30P H-H 200MM UL20276 LG708G
METAL ASSEMBLY, FRAME L1715-LPL
SHIELD, INVERTER CAP-TOP(L1715)
SHIELD, INVERTER CAP -BOTTOM(L1715)