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Model Description
MODEL BRAND
Printing Specification
1. Trim Size (Format) : 215mm x 280 mm
2. Printing Colors• Cover : LG COLORS• Inside : Black
3. Stock (Paper)• Cover : Snow White 150 g/• Inside : Snow White 100 g/
4. Printing Method : 5. Bindery : Saddle stitch6. Language : English7. Number of pages : 24
Part No.
1.
2.
Service Guide SpecificationService Guide Specification
Changes 4.
REV.NO. MM/DD/YY CHANGE NO. CHANGE CONTENTS
1
2
3
4
5
7
6
SUFFIX
L1915SM LG3828TSL095Y
(1) Origin Notification* LGEDI : Printed in Indonesia * LGEWA : Printed in U.K.* LGESP : Printed in Brazil * LGEMX : Printed in Mexico* LGENT : Printed in China * LGEIL : Printed in India
DESCRIPTION OF BLOCK DIAGRAM.....................8ADJUSTMENT ...................................................... 10TROUBLESHOOTING GUIDE .............................. 12EXPLODED VIEW...................................................16 REPLACEMENT PARTS LIST ...............................18 SCHEMATIC DIAGRAM......................................... 20
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
POWER S/W OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
-
POWER CONSUMPTION
less than 45 W
less than 1 W
less than 1 W
less than 1 W
less than 1 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
OFF
VIDEO
ACTIVE
OFF
OFF
OFF
OFF
- 3 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
• There are some special components used in LCD mon-itor 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’s speci-fied parts to prevent electric shock, fire or other hazard.
• Do not modify original design without obtaining writtenpermission from manufacturer or you will void the origi-nal 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 are ground-ed 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 inverter cir-cuit. If the wires are pressed cause short and may burnor take fire.
PRECAUTION
CAUTIONPlease use only a plastic screwdriver to protect yourselffrom shock hazard during service operation.
- 4 -
TIMING CHART
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 – 70.8 449 350 37 2 60
H + 37.879 1056 800 40 128 88
V + 60.317 628 600 1 4 23
H – 31.469 800 640 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 + 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
800x60060Hz
640x48060Hz
640x48075Hz
720x40070Hz
800x60075Hz
832x62475Hz
1024x76860Hz
1024x76875Hz
1152x90075Hz
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 -
FRONT VIEW
Front Control Panel
REAR VIEW
OPERATING INSTRUCTIONS
Front Control Panel
Power ConnectD-Sub SignalConnect
12 4 3
1. Power ON/OFF ButtonUse this button to turn the monitor on or off.
Power IndicatorThis 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 ButtonUse these button to enter or exit the On Screen Display.
3. SELECT/AUTO Button Use this button to enter a selection in the On Screen Display.
4. ButtonUse these buttons to choose or adjust items in the OnScreen Display.
When adjusting your display settings, alwayspress the SELECT/AUTO button beforeentering the On Screen Display(OSD). Thiswill automatically adjust your display image
to the ideal settings for the current screen resolution size (displaymode).
The best display mode is 1280 x 1024.
This feature lets you easily select the best desired imagecondition optimized to the environment (ambient illumina-tion, image types etc.).
• DAY : Bright ambient illumination• NIGHT : Dark ambient illumination• TEXT : For text images (Word processing etc.)• MOVIE : For animation images in videos or movies • PHOTO : For pictures or drawings• USER MODE : For use under user setup image
conditions (Brightness, contrast and color tint areselected by the user in OSD Screen Setup Menu.)
100
100 Bring up Contrast and Brightness adjustment. :
- 6 -
J702
J706
J705
CON002
CN103CN102
CN104CN105
WIRING DIAGRAM
Connector Ass’y P/N: 6631T20020Q
Connector Ass’y P/N: 6631T11012W
Connector Ass’y P/N: 6631T20024C
This function allows you to secure the current control settings, so that they cannot be inadvertentlychanged. Press and hold the MENU button and button for 3 seconds: the message “CONTROLSLOCKED” 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
OPERATING INSTRUCTIONS
- 7 -
D-S
UB
MS
T91
11B
incl
ud
ing
(AD
C/L
VD
S/S
CA
LE
R )
MT
V31
2M
ico
m
LC
D M
od
ule
R,G
,B
dif
fere
nti
al
LIP
S5V
12V
5V
AC
In
pu
t
3.3V
Reg
.D
iod
eK
DS
184
5V3.
3V
12V
R,G
,B, H
/V S
ync
3.3
V2.
5V
3.3
V
2.5
V
LVD
S(L
ow
Vo
ltag
eD
iffe
ren
tial
Sig
nal
ing
)
BLOCK DIAGRAM
- 8 -
DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part.This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to thedigital 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, ADC, LVDS transmitter.The Scaler gets the video signal converted analog to digital, interpolates input to 1280 X 1024 resolution signal andoutputs 8-bit R, G, B signal to transmitter.
2. Power Part.This part consists of the one 3.3V regulator, and two 2.5V drop diodes to convert power which is provided 12V, 5V inPower board.5V is provided for and 12V is provided for LCD panel Micom.Also, 5V is converted 3.3V by regulator and 3.3V is converted 2.5V by drop diode. Converted power is provided for IC in the main board.
3. 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.
- 9 -
EMICOMPONENTS
LINE100 ~ 240V
INPUT RECTIFIERAND FILTER
ENERGYTRANSFER
OUTPUT RECTIFIERAND FILTER
12V
5V
GND
SIGNALCOLLECT-
ONPHOTO
INVERTER CIRCUIT High Voltage output12V
-COUPLERISOLATION
PWM CONTROLCIRCUIT
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 photo tran-sistor.
- 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 -
1) Turn off the power switch at the front side of the display.
2) Wait for about 3 seconds and press MENU, POWER switch with 1 second interval.
3) The SVC OSD menu contains additional menus that the User OSD menu as described below.
a) MODULE : To select applied module.b) NVRAM INIT : EEPROM initialize(24C08)c) ADC OFFSET : The lowest value of input leves sets to digitally 0(zero).d) ADC GAIN : The highest value of input levels sets to digitally 255.e) ADC CAL : W/B balance sets the gain and offset value.f) ELAPSED CLEAR : To initialize using time.
220
IBMCompatible PCVideo Signal
Generator
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
11
Figure 1. Cable Connection
SERVICE OSD
- 12 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER(POWER INDICATOR OFF)
CHECK POWERBOARD, 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
NO
NOCHECK U201 PIN 122PULSE
CHECK U201
CHECK 3.3V LINE
CHECK X-TAL
IS U201 PIN114 (3.3V) VOLTAGE ?
YES
YESNO PROBLEM
YES
CHECK KEY CONTROLCONNECTOR ROUTINE
YES
- 13 -
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, PIN6
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
- 14 -
3. NO RASTER (OSD IS NOT DISPLAYED) – MST9111B
1. CHECK PIN122, 123 SOLDERING CONDITION
2. CHECK X5013. TROUBLE IN U201
U201 POWER PIN 8,114
3.3V?
NOCHECK U801
U201 PIN122, 123
OSCILLATE AS12MHZ?
CHECK CONNECTION LINE FROM D-SUB TO U501
TROUBLE IN CABLE OR LCD MODULE
YES
YES
YES
NO RASTER(OSD IS NOT DISPLAYED)
U501PIN43 IS 64KHz H-SYNC?PIN44 IS 60Hz V-SYNC?IS PULSE APPEARED
AT SIGNAL PINS?AT MODE 12?
NO
NO
- 15 -
4. TROUBLE IN DPM
TROUBLE IN DPM
TROUBLE IN U501
CHECK PC PC IS NOT GOINGINTO DPM OFF MODE
NO
CHECK H/V SYNCLINE
NO
YES
YES
CHECK R773, R775(SYNC) ?
CHECKU501 PIN 43.44SYNC PULSE ?
- 16 -
101
102
109
108
110
111
103
104
105
106
107
112
EX
PL
OD
ED
VIE
W
- 17 -
EXPLODED VIEW PARTS LIST
101
102
103
104
105
106
107
108
109
110
111
112
DescriptionPart No.Ref. No.
3091TKL122D CABINET ASSEMBLY, L1915S BRAND TKL104 LIFE IS GOOD 89483-For Australia
3091TKL122C CABINET ASSEMBLY, L1915S BRAND TKL104 89483 WA-LOCAL -For Europe
6304FLP142A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-B4K1 LG PHILPS TFT COLOR 20T,TN,250NITS,SXGA,LVDS
3809TKL086A BACK COVER ASSEMBLY, L1915S 3808TKL086A ABS,8D966 -For Australia
3809TKL086C BACK COVER ASSEMBLY, L1915S TKL086A WA-LOCAL -For Europe
3043TKK145W TILT SWIVEL ASSEMBLY, L1915S . NO SWIVEL 8D966 -For Australia
3043TKK145Z TILT SWIVEL ASSEMBLY, L1915SN . L1915SN LGEWA LOCAL -For Europe
3043TKK147G TILT SWIVEL ASSEMBLY, L1915S . M/GRAY,NO SWIVEL -For Australia
3043TKK147M TILT SWIVEL ASSEMBLY, L1915S . "G"-LOCAL(LGEWA) -For Europe
3550TKK452G COVER, L1915S STAND REAR CAP ABS 8D966
6871TST717A PWB(PCB) ASSEMBLY,SUB, L1915SM CONTROL TOTAL BRAND CONTROL
3313TL9053A MAIN TOTAL ASSEMBLY, L1915SM BRAND CL-61
6871TPT271R PWB(PCB) ASSEMBLY, POWER, M-CHASSIS 1719 SOCKET,2PIN,450V POWER TOTAL LIEN CHANG
6871TPT271B PWB(PCB) ASSEMBLY, POWER, L1710SM POWER TOTAL LIEN CHANG M-CHASSIS THE INTERGRATED LIPS FOR LPL,CMO,HD
4951TKS145N METAL ASSEMBLY, FRAME L1915S, LPL -For Australia
4951TKS145P METAL ASSEMBLY, FRAME L1915S N-CKD -For Europe