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: L1720B (L1720BL-AL**R) ( ) **Same model for Service *To apply the Mstar Chip.
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COLOR MONITOR SERVICE MANUAL - ESpecmonitor.espec.ws/files/3828tsl074t_l1720bl_e__977.pdf · *To apply the Mstar Chip. 1. LCD CHARACTERISTICS ... The Micom distinguishes polarity
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• There are some special components used in LCDmonitor that are important for safety. These parts aremarked on the schematic diagram and thereplacement parts list. It is essential that these criticalparts should be replaced with the manufacturer’sspecified parts to prevent electric shock, fire or otherhazard.
• Do not modify original design without obtaining writtenpermission from manufacturer or you will void theoriginal parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULEWITH BACKLIGHT UNIT.
• Must mount the module using mounting holes arrangedin four corners.
• Do not press on the panel, edge of the frame stronglyor electric shock as this will result in damage to thescreen.
• Do not scratch or press on the panel with any sharpobjects, such as pencil or pen as this may result indamage to the panel.
• Protect the module from the ESD as it may damage theelectronic circuit (C-MOS).
• Make certain that treatment person’s body aregrounded through wrist band.
• Do not leave the module in high temperature and inareas 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 withinthe module.
• If the surface of panel become dirty, please wipe it offwith a softmaterial. (Cleaning with a dirty or rough clothmay damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
• If you want to replace with the new backlight (CCFL) orinverter circuit, must disconnect the AC adapterbecause high voltage appears at inverter circuit about650Vrms.
• Handle with care wires or connectors of the invertercircuit. If the wires are pressed cause short and mayburn or take fire.
PRECAUTION
CAUTIONPlease use only a plastic screwdriver to protect yourselffrom shock hazard during service operation.
TIMING CHART
- 4 -
VIDEO
SYNC
B
D
CF
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 – 70.8Hz 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/VSort
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
640x35070Hz
640x48060Hz
640x48075Hz
720x40070Hz
800x60060Hz
800x60075Hz
832x62475Hz
1024x76860Hz
1024x76875Hz
1152x87075Hz
1152x90065Hz
1280x102460Hz
1280x102475Hz
Sync Polarity Frequency
DotClock
Total Period(E)
Video Active Time(A)
Sync Duration(D)
Back Porch(F)
Front Porch(C)
Resolution
- 5 -
OPERATING INSTRUCTIONS
FRONT VIEW REAR VIEW
Front Control Panel
1. Power ButtonUse this button to turn the display on or off.<Power (DPMS) Indicator>This Indicator lights up blue when the displayoperates normally. If the display is in DPM (EnergySaving) mode, this indicator color changes toamber.
2. ButtonUse these buttons to choose or adjust items in theOn Screen Display.
3. Menu ButtonUse this button to enter or exit the On ScreenDisplay.
4. AUTO/SELECT ButtonUse this button to enter a selection in the OnScreen Display.
When adjusting your display settings, alwayspress the AUTO/SELECT button before enteringthe On Screen Display(OSD). This willautomatically adjust your display image to theideal settings for the current screen resolutionsize (display mode).
The best display mode is 1024x768/60Hz.
See front control panel
D-sub Connect
Power Connect
143 2
This function optimizes the brightness, contrast orcolor value to the surrounding conditions and settingsand enables you to enjoy the most suitable picture byadjusting the surroundings (DAY/NIGHT/USERMODE).
• 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 andColor value on the On Screen Display.
100
100 Bring up Contrast and Brightness adjustment. :
- 6 -
WIRING DIAGRAM
J707
J702
CN1
CN2
CN4 CN5
CN3
Connector Ass’y :P/N: 6631T11016C
Connector Ass’y :P/N: 6631T20024C
Connector Ass’y :P/N: 6631T20008G
Connector Ass’y :P/N: 6631T20023A
- 7 -
D-S
UB
MS
T91
11in
clu
din
g(A
DC
/LV
DS
/SC
AL
ER
)
MT
V31
2M
ico
m
LC
D M
od
ule
R,G
,B
dif
fere
nti
al
LVD
S(L
ow
Vo
ltag
e
Dif
fere
nti
al S
ign
alin
g)
LIP
S5V
5V
5V
AC
Inp
ut
3.3V
Reg
.2.
5VR
eg.
5V5V
R,G
,B, H
/V S
yn
c
3.3
V2.
5V
3.3
V
2.5
V
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 PartThis 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 PartThis 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 -
EMICOMPONENTS
LINE100 ~ 240V
INPUT RECTIFIERAND FILTER
ENERGYTRANSFER
OUTPUT RECTIFIERAND FILTER
12V
5V
GND
SIGNALCOLLECTI
ON
PHOTO-COUPLERISOLATION
PWMCONTROLCIRCUIT
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, thecircuit 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, toadjust the duty cycle during different AC input and output loading condition to achive the dc output stablize, and alsothe 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 toachieve 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 phototransistor.
- 10 -
ADJUSTMENT
Windows EDID V1.0 User Manual
Operating System: MS Windows 98, 2000, XPPort Setup: Windows 98 => Don’t need setup
Windows 2000, XP => Need to Port Setup.This program is available to LCD Monitor only.
1. Port Setupa) Copy “UserPort.sys” file to
“c:\WINNT\system32\drivers” folderb) Run Userport.exe
c) Remove all default numberd) Add 300-3FF
e) Click Start button.f) Click Exit button.
2. EDID Read & Write1) Run WinEDID.exe
2) Edit Week of Manufacture, Year of Manufacture, Serial Numbera) Input User Info Datab) Click “Update” buttonc) Click “ Write” button
- 11 -
220
IBMCompatible PC
PARALLEL PORT
Power inlet (required)
Power LED
ST Switch
Power Select Switch(110V/220V)
Con
trol
Lin
e
Not u
sed
RS232
C
PARAL
LEL
V-SY
NC
POW
ER
ST
VGS
MONITOR
E
E
V-Sync On/Off Switch(Switch must be ON.)
F
F
A
A
BB
C
C
15105
5
69
1
1
1
14
13
25
6
5V
5V
5V
4.7K4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11Video SignalGenerator
Figure 1. Cable Connection
SERVICE OSD
- When entering Service mode: You can check the OSD as described below by pressing down thepower key and the menu key while the power is off.
1. MODULE : Whenever you press the left/right key, the module applied to the current model will bedisplayed. When the module applied to the current set is displayed, turn the power on and off to executeall module settings.
2. ADC OFFSET/ADC GAIN : Adjusts the offset and gain values that are the basis of the color coordinationvalue. The result differs according to the pattern and video card signal level. These two menus are notused separately but executed when the ADC CAL is executed.
3. ADC CAL.: Carried out when adjusting the color coordination.
4. ELAPSED CLEAR: Resets the usage time after monitor assembly to "0".
5. ELAPSED TIME: Displays the usage time after the monitor is shipped out. When executing the ELAPSEDCLEAR menu, this will be shown as "0".
6. VERSION: Displays the MICOM version of the set by model name, version name and date.
- 11 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER(POWER INDICATOR OFF)
CHECK POWERBOARD, AND FIND
OUT A SHORT POINT AS OPENING
EACH POWER LINE
CHECK J705VOLTAGE
PIN5, PIN6 (5V)?
NO
CHECK 5VS LINE(OPEN CHECK)
CHECK U501 PIN 8 Voltage
(5V) ?
NO
CHECK IIC LINECONNECTION(U501, U502)
CHECK U201 VCC,XTAL, RESET
IS U201 PIN114 (3.3V)
VOLTAGE REPEATED AS PULSE SHAPE ?
NO
YES
YESNO PROBLEM
YES
CHECK KEY CONTROLCONNECTOR ROUTINE
- 12 -
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
CHECK MICOM INVON/OFF PORT.
J705 PIN95V?
NO
NO RASTER(OSD IS NOT DISPLAYED)
CHECK LIPS
J705 PIN5, PIN 6
5V?
NO
1. CONFIRM BRIGHTNESSOSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ PORT
J705 PIN105V?
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 LAMPIN THE LCD MODULE
YES
YES
YES
YES
- 13 -
1. CHECK PIN122, 123 SOLDERING CONDITION
2. CHECK X5013. TROUBLE IN U201
U201 POWER PIN 8,114
3.3V?
NOCHECK U804
U201 PIN122, 123
OSCILLATE AS12MHZ?
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)
U501PIN43 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 GOINGINTO DPM OFF MODE
NO
TROUBLE INSIGNAL CABLE
NO
YES
YES
CHECK R734, R741(SYNC) ?
CHECKU501 PIN 24
(0V) ?
PRINTED CIRCUIT BOARD
- 15 -
1. MAIN BOARD (Component Side)
R708
C711 C708
C709
J70
6
Q703
R709
C710
C80
3
R812
U80
2
C828J704
C82
1
C82
2
R76
9
J70
5
Q7
04
R74
7
R74
8
U80
1
1
R744
R74
5
R811
R801
R802
R804
C804
C82
9
R749
C83
2
C818
1
C820
R77
0
R840
R84
6
R847
R84
1
U80
4
R80
3
C230
C80
1
C81
7
C22
1
C83
1
10
0
C819C22
2
C21
7
90
80
C22
7
70
U20
1
J70
7
1
R73
5
U50
2
C516
C76
0
R84
2
R848
R84
4
R84
5
R84
3
R849
U80
3
R511
C22
5
C226
C219
C80
2
11
0
C22
3C
218
60
C72
7
Q7
05
R75
3
R77
9
C73
2
R533R534
R53
7
Q5
06
R510
X501
Q5
03
R535
R532R550
C550X
20
1
C22
8C
229
12
0
R73
9
C22
0J7
02
50
R50
2
R75
0
R75
1
U50
1
R50
1
C512 C50
2
C50
3
15R536C513 10
Q5
02
C501
C51
4
5
R592
R593
R20
4
R205
C211
10
1
C21
2
C215
20
C20
7
30
C20
8
1
40
Q5
05
R525
R54
1
20
R58
1
R571
R531
D70
7
R530
R580
R570
R520
R50
4
R509
R59
0
R59
1
Q7
01
R20
7R
733
R52
2
C21
6
A
Q702
R716R
740
C201
C712
C202C203
C20
9
C71
3
C21
0
C714
1
R528
R529
25
C703
40
D70
3
R725
R70
5
R722
ZD
702
C505
C71
5
D70
6
R71
7
ZD701
D701D702
R701R703 R706
R20
2
R20
3
R20
8
R20
9
R21
0
R24
0
C20
5
C20
6
C23
2
C23
3
C24
0
C23
1
R20
1C
204
MODEL:L-CHASSIS-ANALOG
P/N :6870T628A11
DATE :2003.02.24
Q5
04 R51
5
30
R73
4
R540 R551
35
A
R707
R74
1U
702
C707 C73
1
C73
0
R723
R724
R726
R727
R523
R524
ZD
703
ZD
704
C50
6J7
03
- 16 -
2. MAIN BOARD (Solder Side)
1
C214
C224
C213
J3
1LED1
DATE :2003.05.22MODEL:L1520/1720 KEY
SW2
P/N :6870T672C11
POWER
J1
SW3AUTO
R5
SW7RIGHT
R6
SW4LEFT
R4SW6UP
DATE :2003.05.22P/N :6870T672C11
MODEL:L1520/1720 KEY
R7
SW5DOWN
SW1MENU
R3
ZD1R
2
ZD2R
1
1
J2 1
3. CONTROL BOARD
- 17 -
EX
PL
OD
ED
VIE
W
4
1
2
3
12
10
11
13
5
6
8
9
7
- 18 -
EXPLODED VIEW PARTS LIST
Ref. No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Part No.
3091TKL086A
6304FLP058A
or 6304FLP086A
or 6304FLP085A
or 6304FLP076A
3809TKL059A
3043TKK134A
6871TST430A
4951TKS111A
6631T11012W
6871TPT237C
6871TMT461A
4951TKK139A
3550TKK398A
3550TKK400A
6850TD9004D
Description
CABINET ASSEMBLY, L1720 BRAND . .
LCD(LIQUID CRYSTAL DISPLAY) LM170E01-A4 LG PHILPS TFT COLOR 17" TFT LCD
LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5K6 LG PHILPS TFT COLOR LVDS SXGA OKY GATE D-IC
LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A4K4 LG PHILPS TFT COLOR SXGA LVDS OKI GATE D-IC
LCD(LIQUID CRYSTAL DISPLAY) LM170E01-A5 LG PHILPS TFT COLOR LVDS SXGA
BACK COVER ASSEMBLY, L1720 . SILVER SPRAY
TILT SWIVEL ASSEMBLY, L1720BL. SILVER+CR
PWB(PCB) ASSEMBLY,SUB, L1720BL CONTROL TOTAL BRAND CL-43
METAL ASSEMBLY, FRAME L1720BL LPL
CONNECTOR ASSEMBLY, 30P H-H 200MM UL20276 LG708G
PWB(PCB) ASSEMBLY, POWER, LS71K POWER TOTAL POWERNET PWI1704S(L)12V/1.2A 5V/1A LIPS FOR LPL
PWB(PCB) ASSEMBLY, MAIN, L1720BL ALRDR BRAND CL-43 TOTAL