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Service Guide Specification
1. Model Description
MODEL L1750S-BNN BRAND LG
L1950S-BNN Part No. 3828TSL093V
SUFFIX ANAUER FLATRON L1750S
Product Name
FLATRON L1950S
2. 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 stitch
6. Language : English
7. Number of pages : 28 ( Including blank 1pages)
3. Special Instructions
(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
4. Changes
8
7
6
5
4
3
2
1
REV.
NO. MM/DD/YY CHANGE NO. CHANGE CONTENTS
Pagination sheet
Front cover English English English English English
Cover Inside
blank 2 3 4 .... .....
English English English English English Rear cover Rear
Inside
Cover
.... 24 25 24 25 26
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-82
MODEL: L1750S (L1750S-BNN.AN**EP)
L1950S (L1950S-BNN.AN**EP)
( ) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the MSTAR Chip.
Blank Page1
CONTENTS
SPECIFICATIONS ................................................... 2 SERVICE OSD ...................................................... 13
PRECAUTIONS ....................................................... 3 TROUBLESHOOTING GUIDE .............................. 14
TIMING CHART ....................................................... 7 WIRING DIAGRAM ............................................... 18
DISASSEMBLY ....................................................... 8
BLOCK DIAGRAM ................................................... 9 EXPLODED VIEW...................................................19
DESCRIPTION OF BLOCK DIAGRAM....................10 REPLACEMENT PARTS LIST ...............................21
ADJUSTMENT ...................................................... 12 SCHEMATIC DIAGRAM ......................................... 23
SPECIFICATIONS
1. LCD CHARACTERISTICS 4. Max. Resolution
Type : TFT Color LCD Module D-sub Analog : 1280 x 1024@75Hz
Active Display Area : 17 inch-L1750S
: 19 inch-L1950S 5. POWER SUPPLY
Size : 358.5(W) x 296.5(H) x 17.0(D)-L1750S 5-1. Power : AC 100~240V, 50/60Hz , 1.0A
: 404.2(W) x 330(H) x 22.0(D)-L1950S
Pixel Pitch : 0.264 (H) x 0.264 (V)-L1750S 5-2. Power Consumption
: 0.294 (H) x 0.294 (V)-L1950S
Color Depth : 16.2M colors MODE H/V SYNC VIDEO POWER CONSUMPTION LED COLOR
Electrical Interface : LVDS less than 43 W-L1750S
Surface Treatment : Hard-coating(3H), Anti-Glare POWER ON (NORMAL) ON/ON ACTIVE GREEN
Operating Mode : Normally White, Transmissive mode less than 45 W-L1950S
Backlight Unit : 4-CCFL STAND-BY OFF/ON OFF less than 1 W AMBER
SUSPEND ON/OFF OFF less than 1 W AMBER
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio 10 DPMS OFF OFF/OFF OFF less than 1 W AMBER
L1750S
Left : -60°min., -70°(Typ) Right : +60°min., +70°(Typ) 6. ENVIRONMENT
Top :+45°min., +60°(Typ) Bottom : -50°min., -60°(Typ) 6-1. Operating Temperature : 10°C~35°C
6-2. Relative Humidity : 10%~80%
L1950S 6-3. MTBF : 50,000 HRS with 90%
Left : -70°min., -80°(Typ) Right : +70°min., +80°(Typ) Confidence level
Top :+75°min., +85°(Typ) Bottom : -75°min., -85°(Typ) Lamp Life : 50,000 Hours(Min)
2-2. Luminance : 185(min), 250(Typ) 7. DIMENSIONS (with TILT/SWIVEL)
L1750S
2-3. Contrast Ratio : 300(min), 450(Typ)-L1750S Width : 368 mm (14.49'')
: 300(min), 500(Typ)-L1950S Depth : 230.5 mm (9.07'')
Height : 389.2 mm (15.32'')
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal L1950S
· Type : Separate Sync, SOG Width : 413 mm (16.26'')
Depth : 230.5 mm (9.07'')
3-2. Video Input Signal Height : 421.4 mm (16.59'')
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V 8. WEIGHT (with TILT/SWIVEL)
a) Color 0, 0 : 0 Vp-p L1750S
b) Color 7, 0 : 0.467 Vp-p Net. Weight : 4.9 kg (10.80 lbs)
c) Color 15, 0 : 0.714 Vp-p Gross Weight : 6.5 kg (14.33 lbs)
3) Input Impedance : 75
L1950S
3-3. Operating Frequency Net. Weight : 5.7 kg (12.57 lbs)
Horizontal : 30 ~ 83kHz Gross Weight : 7.9 kg (17.42 lbs)
Vertical : 56 ~ 75Hz
-2-
PRECAUTION
WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING
· There are some special components used in LCD BE CAREFUL ELECTRIC SHOCK !
monitor that are important for safety. These parts are
· If you want to replace with the new backlight (CCFL) or
marked on the schematic diagram and the
inverter circuit, must disconnect the AC adapter
replacement parts list. It is essential that these critical
because high voltage appears at inverter circuit about
parts should be replaced with the manufacturer's
650Vrms.
specified parts to prevent electric shock, fire or other
hazard.
· Handle with care wires or connectors of the inverter
· Do not modify original design without obtaining written circuit. If the wires are pressed cause short and may
permission from manufacturer or you will void the burn or take fire.
original parts and labor guarantee.
Leakage Current Hot Check Circuit
AC Volt-meter
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
· Must mount the module using mounting holes arranged
in four corners. Good Earth Ground
such as WATER PIPE,
· Do not press on the panel, edge of the frame strongly To Instrument's CONDUIT etc.
or electric shock as this will result in damage to the exposed
screen. METALLIC PARTS
· Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in 1.5 Kohm/10W
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.
-3-
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in
service manual and its supplements and addenda, read this service manual.
and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap
publication. to any heat sink in this receiver.
NOTE: If unforeseen circumstances create conflict
between the following servicing precautions and any of the Electrostatically Sensitive (ES) Devices
safety precautions on page 3 of this publication, always Some semiconductor (solid-state) devices can be
follow the safety precautions. Remember: Safety First. damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive (ES)
General Servicing Precautions Devices. Examples of typical ES devices are integrated
1. Always unplug the receiver AC power cord from the AC circuits and some field-effect transistors and
power source before; semiconductor "chip" components. The following
a. Removing or reinstalling any component, circuit techniques should be used to help reduce the incidence of
board module or any other receiver assembly. component damage caused by static by static electricity.
b. Disconnecting or reconnecting any receiver electrical 1. Immediately before handling any semiconductor
plug or other electrical connection. component or semiconductor-equipped assembly, drain
c. Connecting a test substitute in parallel with an off any electrostatic charge on your body by touching a
electrolytic capacitor in the receiver. known earth ground. Alternatively, obtain and wear a
CAUTION: A wrong part substitution or incorrect commercially available discharging wrist strap device,
polarity installation of electrolytic capacitors may which should be removed to prevent potential shock
result in an explosion hazard. reasons prior to applying power to the unit under test.
d. Discharging the picture tube anode. 2. After removing an electrical assembly equipped with
2. Test high voltage only by measuring it with an ES devices, place the assembly on a conductive
appropriate high voltage meter or other voltage surface such as aluminum foil, to prevent electrostatic
measuring device (DVM, FETVOM, etc) equipped with charge buildup or exposure of the assembly.
a suitable high voltage probe. 3. Use only a grounded-tip soldering iron to solder or
Do not test high voltage by "drawing an arc". unsolder ES devices.
3. Discharge the picture tube anode only by (a) first 4. Use only an anti-static type solder removal device.
connecting one end of an insulated clip lead to the Some solder removal devices not classified as "anti-
degaussing or kine aquadag grounding system shield static" can generate electrical charges sufficient to
at the point where the picture tube socket ground lead damage ES devices.
is connected, and then (b) touch the other end of the 5. Do not use freon-propelled chemicals. These can
insulated clip lead to the picture tube anode button, generate electrical charges sufficient to damage ES
using an insulating handle to avoid personal contact devices.
with high voltage. 6. Do not remove a replacement ES device from its
4. Do not spray chemicals on or near this receiver or any protective package until immediately before you are
of its assemblies. ready to install it. (Most replacement ES devices are
5. Unless specified otherwise in this service manual, packaged with leads electrically shorted together by
clean electrical contacts only by applying the following conductive foam, aluminum foil or comparable
mixture to the contacts with a pipe cleaner, cotton- conductive material).
tipped stick or comparable non-abrasive applicator; 7. Immediately before removing the protective material
10% (by volume) Acetone and 90% (by volume) from the leads of a replacement ES device, touch the
isopropyl alcohol (90%-99% strength) protective material to the chassis or circuit assembly
CAUTION: This is a flammable mixture. into which the device will be installed.
Unless specified otherwise in this service manual, CAUTION: Be sure no power is applied to the chassis
lubrication of contacts in not required. or circuit, and observe all other safety precautions.
6. Do not defeat any plug/socket B+ voltage interlocks 8. Minimize bodily motions when handling unpackaged
with which receivers covered by this service manual replacement ES devices. (Otherwise harmless motion
might be equipped. such as the brushing together of your clothes fabric or
7. Do not apply AC power to this instrument and/or any of the lifting of your foot from a carpeted floor can
its electrical assemblies unless all solid-state device generate static electricity sufficient to damage an ES
heat sinks are correctly installed. device.)
8. Always connect the test receiver ground lead to the
receiver chassis ground before connecting the test
receiver positive lead.
Always remove the test receiver ground lead last.
-4-
General Soldering Guidelines Replacement
1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board.
appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad
temperature within the range or 500 to 600
F F. and solder it.
2. Use an appropriate gauge of RMA resin-core solder 3. Clean the soldered areas with a small wire-bristle
composed of 60 parts tin/40 parts lead. brush. (It is not necessary to reapply acrylic coating to
3. Keep the soldering iron tip clean and well tinned. the areas).
4. Thoroughly clean the surfaces to be soldered. Use a
mall wire-bristle (0.5 inch, or 1.25cm) brush with a "Small-Signal" Discrete Transistor
metal handle. Removal/Replacement
Do not use freon-propelled spray-on cleaners. 1. Remove the defective transistor by clipping its leads as
5. Use the following unsoldering technique close as possible to the component body.
a. Allow the soldering iron tip to reach normal 2. Bend into a "U" shape the end of each of three leads
temperature. remaining on the circuit board.
(500 to 600
F F) 3. Bend into a "U" shape the replacement transistor leads.
b. Heat the component lead until the solder melts. 4. Connect the replacement transistor leads to the
c. Quickly draw the melted solder with an anti-static, corresponding leads extending from the circuit board
suction-type solder removal device or with solder and crimp the "U" with long nose pliers to insure metal
braid. to metal contact then solder each connection.
CAUTION: Work quickly to avoid overheating the
circuitboard printed foil. Power Output, Transistor Device
6. Use the following soldering technique. Removal/Replacement
a. Allow the soldering iron tip to reach a normal 1. Heat and remove all solder from around the transistor
temperature (500 to 600
F F) leads.
b. First, hold the soldering iron tip and solder the strand 2. Remove the heat sink mounting screw (if so equipped).
against the component lead until the solder melts. 3. Carefully remove the transistor from the heat sink of the
circuit board.
c. Quickly move the soldering iron tip to the junction of 4. Insert new transistor in the circuit board.
the component lead and the printed circuit foil, and 5. Solder each transistor lead, and clip off excess lead.
hold it there only until the solder flows onto and 6. Replace heat sink.
around both the component lead and the foil.
CAUTION: Work quickly to avoid overheating the Diode Removal/Replacement
circuit board printed foil. 1. Remove defective diode by clipping its leads as close
d. Closely inspect the solder area and remove any as possible to diode body.
excess or splashed solder with a small wire-bristle 2. Bend the two remaining leads perpendicular y to the
brush. circuit board.
3. Observing diode polarity, wrap each lead of the new
IC Remove/Replacement diode around the corresponding lead on the circuit
Some chassis circuit boards have slotted holes (oblong) board.
through which the IC leads are inserted and then bent flat 4. Securely crimp each connection and solder it.
against the circuit foil. When holes are the slotted type, 5. Inspect (on the circuit board copper side) the solder
the following technique should be used to remove and joints of the two "original" leads. If they are not shiny,
replace the IC. When working with boards using the reheat them and if necessary, apply additional solder.
familiar round hole, use the standard technique as
outlined in paragraphs 5 and 6 above. Fuse and Conventional Resistor
Removal/Replacement
Removal 1. Clip each fuse or resistor lead at top of the circuit board
1. Desolder and straighten each IC lead in one operation hollow stake.
by gently prying up on the lead with the soldering iron 2. Securely crimp the leads of replacement component
tip as the solder melts. around notch at stake top.
2. Draw away the melted solder with an anti-static 3. Solder the connections.
suction-type solder removal device (or with solder CAUTION: Maintain original spacing between the
braid) before removing the IC. replaced component and adjacent components and the
circuit board to prevent excessive component
temperatures.
-5-
Circuit Board Foil Repair At Other Connections
Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper
circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins. This technique
to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the
"lift-off" the board. The following guidelines and component side of the circuit board.
procedures should be followed whenever this condition is 1. Remove the defective copper pattern with a sharp
encountered. knife.
Remove at least 1/4 inch of copper, to ensure that a
At IC Connections hazardous condition will not exist if the jumper wire
To repair a defective copper pattern at IC connections use opens.
the following procedure to install a jumper wire on the 2. Trace along the copper pattern from both sides of the
copper pattern side of the circuit board. (Use this pattern break and locate the nearest component that is
technique only on IC connections). directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead
1. Carefully remove the damaged copper pattern with a of the nearest component on one side of the pattern
sharp knife. (Remove only as much copper as break to the lead of the nearest component on the
absolutely necessary). other side.
2. carefully scratch away the solder resist and acrylic Carefully crimp and solder the connections.
coating (if used) from the end of the remaining copper CAUTION: Be sure the insulated jumper wire is
pattern. dressed so the it does not touch components or sharp
3. Bend a small "U" in one end of a small gauge jumper edges.
wire and carefully crimp it around the IC pin. Solder the
IC connection.
4. Route the jumper wire along the path of the out-away
copper pattern and let it overlap the previously scraped
end of the good copper pattern. Solder the overlapped
area and clip off any excess jumper wire.
-6-
TIMING CHART
VIDEO
A
E
D B
SYNC
C
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H/V Sync Dot Total Period Video Active Front Porch Sync Duration Back Porch
Mode Sort Polarity Clock Frequency (E) (D) Resolution
Time (A) (C) (F)
1 H + 25.175 31.469 800 640 16 96 48 640 x 350
V - 70.09 449 350 37 2 60
2 H - 28.321 31.468 900 720 18 108 54 720 X 400
V + 70.08 449 400 12 2 35
3 H - 25.175 31.469 800 640 16 96 48 640 x 480
V - 59.94 525 480 10 2 33
4 H - 31.5 37.5 840 640 16 64 120 640 x 480
V - 75 500 480 1 3 16
5 H + 40.0 37.879 1056 800 40 128 88 800 x 600
V + 60.317 628 600 1 4 23
6 H + 49.5 46.875 1056 800 16 80 160 800 x 600
V + 75.0 625 600 1 3 21
7 H +/- 57.283 49.725 1152 832 32 64 224 832 x 624
V +/- 74.55 667 624 1 3 39
8 H - 65.0 48.363 1344 1024 24 136 160 1024 x 768
V - 60.0 806 768 3 6 29
9 H - 78.75 60.123 1312 1024 16 96 176 1024 x 768
V - 75.029 800 768 1 3 28
10 H +/- 100.0 68.681 1456 1152 32 128 144 1152 x 870
V +/- 75.062 915 870 3 3 39
11 H +/- 92.978 61.805 1504 1152 18 134 200 1152 x 900
V +/- 65.96 937 900 2 4 31
12 H + 108.0 63.981 1688 1280 48 112 248 1280 x 1024
V + 60.02 1066 1024 1 3 38
13 H + 135.0 79.976 1688 1280 16 144 248 1280 x 1024
V + 75.035 1066 1024 1 3 38
-7-
DISASSEMBLY
#1 #2
Disassembly Hinge Cover. Remove the screws.
#3 #4
1. Pull the front cover upward. Disassemble back cover
2. Then, let the all latches are separated.
3. Put the front face down.
#5 #6
Remove the 6 screws from each up of metal frame. Pell off Al-tape from panel.
#7 #8
Remove Al-tape from control pcb fix. Remove the 4 screws from each side of metal
frame.
-8-
5V LCD Module
5V 3.3V
R,G,B
differential LVDS
(Low Voltage
3.3V Reg. TSU16AL & Differential
78D33 TR(KTA1273) Signaling)
3.3V 1.8V
1.8V TSU16AL
including
MTV312
-9-
(ADC/LVDS/SCALER
3.3V
/INPUT SWITCHING MICOM
12V 5V
/TMDS)
BLOCK DIAGRAM
AC Input LIPS
R,G,B, H/V Sync
D-SUB
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 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, ADC convertor and LVDS transmitter.
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.
2. Power Part.
This part consists of the one 3.3V, and one 1.8V regulators to convert power which is provided 5V in Power board.
12V is provided for inverter, 12V is provided for LCD panel and 5V for micom.
Also, 5V is converted 3.3V and 1.8V by regulator. Converted power is provided for IC in the main board.
The inverter converts from DC12V to AC 700Vrms and operates back-light lamps of module.
3. MICOM Part.
This part is include video controller part. And 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.
- 10 -
LIPS Board Block Diagram
12V
50 ~ 60Hz
HVDC 100KHz 5V
EMI INPUT RECTIFIER ENERGY OUTPUT RECTIFIER
COMPONENTS AND FILTER TRANSFER AND FILTER
LINE GND
100 ~ 240V
PWM PHOTO- SIGNAL
COMTROL COUPLER COLLENT-
CIRCUIT ISOLATI ON ION
PRIMARY SECONDARY
Operation description_LIPS
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.
- 11 -
ADJUSTMENT
Windows EDID V1.0 User Manual 2. EDID Read & Write
1) Run WinEDID.exe
Operating System: MS Windows 98, 2000, XP
Port Setup: Windows 98 => Don't need setup
Windows 2000, XP => Need to Port Setup.
This program is available to LCD Monitor only.
1. Port Setup
a) Copy "UserPort.sys" file to
"c:\WINNT\system32\drivers" folder
b) Run Userport.exe
2) Edit Week of Manufacture, Year of Manufacture,
Serial Number
a) Input User Info Data
b) Click "Update" button
c) Click " Write" button
c) Remove all default number
d) Add 300-3FF
e) Click Start button.
f) Click Exit button.
- 12 -
SERVICE OSD
1) Turn off the power switch at the front side of the display.
2) Wait for about 5 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) Auto Color : W/B balance and Automatically sets the gain and offset value.
b) NVRAM INIT : EEPROM initialize.(24C08)
c) CLEAR ETI : To initialize using time.
d) AGING : Select Aging mode(on/off).
e) R/G/B-9300K : Allows you to set the R/G/B-9300K value manually.
f) R/G/B-6500K : Allows you to set the R/G/B-6500K value manually.
g) R/G/B-Offset : Allows you to set the R/G/B-Offset value manually.(Analog Only)
h) R/G/B-Gain : Allows you to set the R/G/B-Gain value manually.(Analog Only)
i) MODULE : To select applied module.
A
9 6
IBM 5 1
15 11
Video Signal Compatible PC 10 6
Generator 5 1
C
PARALLEL PORT 13 1
ed
25 14
us
C
t
No
OFF ON
2
23
5V
RS
F
EL
Control Line
LL
C
RA
PA
5V
Power inlet (required) 4.7K
220
ON 5V 4.7K
Power Select Switch
E
R
VG
WE
S 74LS06
(110V/220V)
PO
OFF 4.7K
A
T
MO Power LED
CS
NI
YN
TO
74LS06
V-S
R
E ST Switch
B B
F V-Sync On/Off Switch
(Switch must be ON.)
Figure 1. Cable Connection
- 13 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK J705 CHECK POWER BOARD,
NO AND FIND OUT A SHORT
VOLTAGE
PIN5, PIN6 (5V)? POINT AS OPENING
EACH POWER LINE
YES
CHECK NO CHECK 5VS LINE
U501 PIN 8 VOLTAGE (OPEN CHECK)
(5V) ?
YES NO PROBLEM
CHECK KEY CONTROL
CONNECTOR ROUTINE
IS U201 NO
PIN90 (3.3V) CHECK 3.3V LINE
VOLTAGE ?
YES
1 CHECK U201 PIN 96 NO
CHECK X-TAL
PULSE
YES
CHECK U201
Waveforms
1 U201-#96
- 14 -
2. NO RASTER (OSD IS NOT DISPLAYED) LIPS
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK POWER BOARD,
J705 NO AND FIND OUT A SHORT
PIN5, PIN6
POINT AS OPENING
5V?
EACH POWER LINE
YES
J705 PIN9 NO CHECK MICOM INV
2.5V? ON/OFF PORT.
YES
1. CONFIRM BRIGHTNESS
J705 PIN10 NO OSD CONTRL STATE.
5V? 2. CHECK MICOM DIM-ADJ
PORT
YES
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL. NO
(CONTACT PROBE TO LIPS
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
YES
REPLACE CCFL LAMP
IN THE LCD MODULE
- 15 -
3. NO RASTER (OSD IS NOT DISPLAYED) MSTAR
NO RASTER
(OSD IS NOT DISPLAYED)
U201 NO CHECK U801 (17", 19")
PIN 18, 90
CHECK U803 (15")
3.3V?
YES
U201 1. CHECK PIN122, 123
PIN96, 97 NO SOLDERING CONDITION
1 OSCILLATE AS 2. CHECK X501
12MHZ? 3. TROUBLE IN U201
YES
U501
PIN43 IS 48KHz H-SYNC? NO CHECK CONNECTION LINE
2 PIN44 IS 60Hz V-SYNC?
FROM D-SUB TO U501
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
YES
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
1 U201-#96, 97 2 U501-#43 H-SYNC 2 U501-#44 V-SYNC
- 16 -
4. TROUBLE IN DPM
TROUBLE IN DPM
CHECK NO CHECK PC
3 R216, R217 PC IS NOT GOING
R778, R781 INTO DPM OFF MODE
YES
CHECK
U501 PIN 43.44 NO
CHECK H/V SYNC LINE
SYNC PULSE ?
YES
TROUBLE IN U501
Waveforms
3 R216, R778 H-Sync 3 R217, R781 V-Sync
- 17 -
WIRING DIAGRAM
Connector Ass'y P/N:
6631T11012W
or 6631T11020W
Connector Ass'y P/N:
6631T20034M
or 6631T20023A Connector Ass'y P/N:
6631T11017X-L1750S
6631T11017Y-L1950S
- 18 -
010
020
070
090 100
080 030
- 19 -
060
EXPLODED VIEW
110
040
050
EXPLODED VIEW PARTS LIST
Ref. No. Part No. Description
010 3091TKL143Y CABINET ASSEMBLY, L1750S BRAND L122 BLACK ABS TCO99+12MS NT LOCAL
3091TKL144E CABINET ASSEMBLY, L1950S BRAND L123 BLACK ABS350,9930 TCO99
020 6304FLP110B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5N5 LG PHILPS TFT COLOR PART NUMBER CHANGE FOR COST COMPENSATION
or 6304FLP086A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5K6 LG PHILPS TFT COLOR LVDS SXGA OKI GATE D-IC
or 6304FLP110A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5N5 LG PHILPS TFT COLOR LPL NJ,250NITS,SXGA,LVDS
or 6304FLP160A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5KS LG PHILPS TFT COLOR NEC D-IC,250NITS,SXGA,LVDS
or 6304FLP179A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6 LG PHILPS TFT COLOR LPL NJ,PB FREE,NEC S D-IC,EGI,250NITS,SXGA,LVDS
or 6304FLP179B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6 LG PHILPS TFT COLOR LPL NJ,PB FREE,NEC S D-IC,EGI,250NITS,SXGA,LVDS COST COMPENSATION
or 6304FLP180B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K1 LG PHILPS TFT COLOR LPL NJ,PB FREE,EGI,TI S D-IC,SXGA,LVDS COST COMPENSATION
or 6304FLP194A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5K2 LG PHILPS TFT COLOR TI D-IC,250NITS,SXGA,LVDS
or 6304FLP199A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K3 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,SS S D-IC,EGI,250NITS,SXGA,LVDS
or 6304FLP200A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K4 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,TI S D-IC,SXGA,LVDS
or 6304FLP228A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5KT LG PHILPS TFT COLOR PB FREE OF A5KS,NEC D-IC,250NITS,SXGA,LVDS
6304FLP210A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-B4N9 LG PHILPS TFT COLOR PB FREE OF B4N2,NJ,20T,TN,250NITS,SXGA,LVDS
or 6304FLP142A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-B4K1 LG PHILPS TFT COLOR 20T,TN,250NITS,SXGA,LVDS
or 6304FLP184A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-B4N2 LG PHILPS TFT COLOR B4K1 LPL NJ,20T,TN,250NITS,SXGA,LVDS
030 3809TKL100A BACK COVER ASSEMBLY, L1750S L100 ABS350 9930(BK)
3809TKL101A BACK COVER ASSEMBLY, L1950S L101 BRAND ABS350 9930(BK)
040 3043TKK227E TILT SWIVEL ASSEMBLY, L1750S - TILT STAND BODY NT-LOCAL
3043TKK227B TILT SWIVEL ASSEMBLY, L1950S - TILT STAND BODY.
050 3043TKK228C TILT SWIVEL ASSEMBLY, LX 50S - TILT STAND BASE NT LOCAL-L1750S
3043TKK228A TILT SWIVEL ASSEMBLY, L1750S - TILT STAND BASE-L1950S
060 6871TST798B PWB(PCB) ASSEMBLY,SUB, L1750 CONTROL TOTAL BRAND NT CKD
6871TST911A PWB(PCB) ASSEMBLY,SUB, L1950 CONTROL TOTAL BRAND KEY
070 4951TKS199A METAL ASSEMBLY, FRAME MAIN L1750 LPL-A5 KUMI
4951TKS200A METAL ASSEMBLY, FRAME MAIN L1950 LPL-E03 TN/AUO-EN04-V2 KUMI
080 6871TPT282C PWB(PCB) ASSEMBLY,POWER, M-CHASSIS 1720 DOCKING,2PIN,450V POWER TOTAL LIEN CHANG PB FREE-L1750S
6871TPT282Q PWB(PCB) ASSEMBLY,POWER, M-CHASSIS 19INCH TN & 1720 DOCKING,2PIN,450V POWER TOTAL LIEN CHANG PB FREE & ANALOG-L1950S
090 3313TL7100C MAIN TOTAL ASSEMBLY, L1750SN TSU16AL NT CKD - LPL BRAND CL-82
3313TL9079A MAIN TOTAL ASSEMBLY, L1950SN AUO MSTAR BRAND CL-66
100 4951TKS203A METAL ASSEMBLY, REAR SHIELD LX50 KUMI
110 3550TKK740A COVER, L1750 BACK DOOR BRAND
3550TKK741A COVER, L1950 BACK DOOR BRAND
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REPLACEMENT PARTS LIST
CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS,
READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL.
* NOTE : S SAFETY Mark
AL ALTERNATIVE PARTS
DATE: 2005. 02. 22. DATE: 2005. 02. 22.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
MAIN BOARD DIODEs
CAPACITORS
D701 0DS226009AA KDS226 TP KEC SOT-23 80V 30
C204 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R D702 0DS226009AA KDS226 TP KEC SOT-23 80V 30
C205 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R D706 0DS226009AA KDS226 TP KEC SOT-23 80V 30
C206 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R ZD701 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C207 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R ZD702 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C211 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y ZD703 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C213 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y ZD704 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C214 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y ZD711 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C215 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y ZD712 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
C216 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y
C217 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y ICs
C218 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y
C219 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y Q502 0IKE704200H KIA7042AP TO-92 TP 4.2 VOLT
C220 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U201 0IPRPM3017A "TSU16AL-LF MSTAR 100P,QFP TR"
C221 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U501 0IZZTSZ595A L1750SN MSTAR MICOM ASSY - 1-L1750S
C222 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U501 0IZZTSZ597A L1950SN MSTAR MICOM ASSY - 1-L1950S
C223 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U502 0ICS240813B "CAT24WC08J-TE13 8P,SOIC R/TP"
C224 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U801 0IPMGKE011A KIA78D33F KEC DPAK R/TP 3.3V
C225 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y
C226 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y TRANSISTOR
C230 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R
C231 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R U802 0TFVI80023A VISHAY SI3865DV R/TP TSOP-6-1950S
C232 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R Q503 0TR390409AE FAIRCHILD KST3904(LGEMTF) TP
C233 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R Q504 0TR390409AE FAIRCHILD KST3904(LGEMTF) TP
C240 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R Q505 0TR390409AE FAIRCHILD KST3904(LGEMTF) TP
C251 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y Q703 0TR390609FA KST3906-MTF TP SAMSUNG SOT2
C503 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y Q704 0TR390609FA KST3906-MTF TP SAMSUNG SOT2
C504 0CH8106F611 10UF 16V M 85STD(CYL) R/TP Q801 0TR127309AA KTA1273-Y(KTA966A) TP KEC TO-L1750S
C506 0CC030CK01A 3PF 1608 50V 0.25 PF R/TP NP Q802 0TR390409AE FAIRCHILD KST3904(LGEMTF) TP-L1750S
C507 0CC180CK41A 18PF 1608 50V 5% R/TP NP0 Q803 0TR127309AA KTA1273-Y(KTA966A) TP KEC TO
C508 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y
C701 0CK105CD56A 1UF 1608 10V 10% R/TP X7R RESISTORs
C707 0CC680CK41A 68PF 1608 50V 5% R/TP NP0
C708 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y R201 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C709 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y R202 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C717 0CC101CK41A 100PF 1608 50V 5% R/TP NP0 R203 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C718 0CC101CK41A 100PF 1608 50V 5% R/TP NP0 R207 0RJ3900D677 390 OHM 1/10 W 5% 1608 R/TP
C727 0CK105CD56A 1UF 1608 10V 10% R/TP X7R R208 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C732 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y R209 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C733 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R R210 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
C734 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R R216 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
C735 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R R217 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
C744 0CC680CK41A 68PF 1608 50V 5% R/TP NP0 R220 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C803 0CE107EF610 "100UF KMG,RD 16V 20% FL BULK" R240 0RJ1001D677 1K OHM 1/10 W 5% 1608 R/TP
C805 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R-L1750S R501 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C809 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y R503 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C812 0CE107EF610 "100UF KMG,RD 16V 20% FL BULK" R506 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C814 0CE107EF610 "100UF KMG,RD 16V 20% FL BULK" R508 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C817 0CK105CD56A 1UF 1608 10V 10% R/TP X7R-L1950S R520 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C818 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0-L1950S R521 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
C819 0CK105CD56A 1UF 1608 10V 10% R/TP X7R R522 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R523 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R530 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP
- 21 -
DATE: 2005. 02. 22. DATE: 2005. 02. 22.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
R534 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R1 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R535 0RJ3301D677 3.3K OHM 1/10 W 5% 1608 R/TP R2 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R537 0RJ3301D677 3.3K OHM 1/10 W 5% 1608 R/TP R3 0RJ2001D677 2K OHM 1/10 W 5% 1608 R/TP
R543 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R4 0RJ2001D677 2K OHM 1/10 W 5% 1608 R/TP
R544 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R5 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R545 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP SW1 6600TR1002A SKQGACE010 J-ALPS NON 12V 50
R547 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP SW2 6600TR1002A SKQGACE010 J-ALPS NON 12V 50
R548 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP SW3 6600TR1002A SKQGACE010 J-ALPS NON 12V 50
R549 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP SW4 6600TR1002A SKQGACE010 J-ALPS NON 12V 50
R555 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP SW5 6600TR1002A SKQGACE010 J-ALPS NON 12V 50
R557 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP ZD1 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
R560 0RJ1501D677 1.5K OHM 1/10 W 5% 1608 R/TP-L1750S ZD2 0DZ560009GB "BZT52C5V6S-(F),LF DIODES R/T"
R560 0RJ4702D677 47000 OHM 1/10 W 5% 1608 R/T-L1950S
R701 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP
R702 0RJ2001D677 2K OHM 1/10 W 5% 1608 R/TP
R703 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP
R704 0RJ2001D677 2K OHM 1/10 W 5% 1608 R/TP
R706 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP
R708 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP
R709 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP
R712 0RJ0102D677 10 OHM 1/10 W 5% 1608 R/TP
R716 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R717 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R720 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
R722 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP
R723 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP
R724 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP
R726 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP
R727 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP
R737 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
R744 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R747 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP
R751 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP
R752 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP
R753 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP
R754 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP
R755 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP
R769 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
R778 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
R781 0RJ0682D677 68 OHM 1/10 W 5% 1608 R/TP
R803 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D
R804 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP-L1750S
R805 0RH2000D622 200 OHM 1 / 10 W 5% D R/TP-L1750S
R806 0RH2000D622 200 OHM 1 / 10 W 5% D R/TP-L1750S
R808 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
R814 0RJ2202D677 22K OHM 1/10 W 5% 1608 R/TP-L1950S
R815 0RJ5600D677 560 OHM 1/10 W 5% 1608 R/TP-L1950S
R816 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP
R820 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP
R821 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D
R824 0RJ0272D677 27 OHM 1/10 W 5% 1608 R/TP
R825 0RJ2000D677 200 OHM 1/10 W 5% 1608 R/TP
OTHERs
X501 6212AA2004A HC-49U TXC 12.0MHZ +/- 30 PP
CONTROL BOARD
C1 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R
C2 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R
LED1 0DLLT0208AA LITEON LTST-C155KGJSKT R/TP
- 22 -
3
SCHEMATIC DIAGRAM