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COLOR MONIT OR
SER VICE MANUAL
CHASSIS NO. : LM62B
MODEL: L204WT(L204WT-SFQ.A**BQF)
L204WT(L204WT-BFQ.A**BQF)
( ) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 4
TIMING CHART ....................................................... 8
DISASSEMBLY ....................................................... 9
BLOCK DIAGRAM ................................................. 10
DESCRIPTION OF BLOCK DIAGRAM...................11
SPECIFICATIONS
1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Active Display Area : 20.1 inch diagonal
Pixel Pitch : 0.258 (H) x 0.258 (V)
Size : 459.4(H) x 296.4(V) x 21.6(D)
Color Depth : 16.2M(6bit + FRC) colors
Electrical Interface : LVDS
Surface Treatment : Anti-Glare, Hard Coating(3H)
Operating Mode : Normally White
Backlight Unit : 6 CCFL
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio ≥ 10
Left : +80° min., +85°(Typ) Right : -80° min., -85°(Typ)
Top :+80° min., +85°(Typ) Bottom : -80° min., -85°(Typ)
2-2. Luminance : 180(Typ) (Typ. ±30)-sRGB
: 230(min), 300(Typ)-6500K
: 150(min)-9300K
ADJUSTMENT ...................................................... 13
TROUBLESHOOTING GUIDE .............................. 15
WIRING DIAGRAM ............................................... 19
EXPLODED VIEW...................................................20
REPLACEMENT PARTS LIST ...............................22
SCHEMATIC DIAGRAM......................................... 24
4. MAX. RESOLUTION
Analog : 1680 x 1050@60Hz
Digital : 1680 x 1050@60Hz
5. POWER SUPPLY
5-1. Power Adaptor(Built-in Power)
Input : AC 100-240V~, 50/60Hz, 1.2A
5-2. Power Consumption
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
VIDEO
less than 50 W(max)
ACTIVE
less than 45 W(typ)
-
less than 1 W
less than 1 W
less than 1 W
less than 1 W
OFF
OFF
OFF
LED COLOR
BLUE
AMBER
AMBER
AMBER
OFF
2-3. Contrast Ratio : 500(min), 600(Typ)
DFC -> 2000 : 1 (Typ)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync, SOG, Digital
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.7 V
3) Input Impedance : 75 Ω
3-3. Operating Frequency
Horizontal : 30 ~ 83kHz
Vertical : 56 ~ 75Hz
6. ENVIRONMENT
6-1. Operating Temperature : 10°C~35°C (50°F~95°F)
6-2. Relative Humidity : 10%~80% (Non-condensing)
6-3. MTBF : 50,000 HRS with 90%
Confidence level
Lamp Life : 40,000 Hours (Min)
7. DIMENSIONS (with TILT/SWIVEL)
Width : 466.2 mm (18.35'')
Depth : 226 mm (8.90'')
Height : 384 mm (15.12'')
8. WEIGHT (with TILT/SWIVEL)
Net. Weight : 4.8 kg (10.58 lbs)
Gross Weight : 5.8 kg (12.79 lbs)
- 2 -
Signal Connector Pin Assignment
1
8
9
17
24
16
• DVI-D Connector (Digital)
Pin Signal (DVI-D)
T. M. D. S. Data2-
1
T. M. D. S. Data2+
2
T. M. D. S. Data2/4 Shield
3
T. M. D. S. Data4-
4
T. M. D. S. Data4+
5
DDC Clock
6
DDC Data
7
Analog Vertical Sync.
8
T. M. D. S. Data1-
9
T. M. D. S. Data1+
10
T. M. D. S. Data1/3 Shield
11
T. M. D. S. Data3-
12
T. M. D. S. Data3+
13
+5V Power
14
Ground
15
T. M. D. S. (Transition Minimized Differential Signaling)
(return for +5V,
H. Sync. and V. Sync.)
Pin Signal (DVI-D)
Hot Plug Detect
16
T. M. D. S. Data0-
17
T. M. D. S. Data0+
18
T. M. D. S. Data0/5 Shield
19
T. M. D. S. Data5-
20
T. M. D. S. Data5+
21
T. M. D. S. Clock Shield
22
T. M. D. S. Clock+
23
T. M. D. S. Clock-
24
- 3 -
PRECAUTION
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
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.
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.
Leakage Current Hot Check Circuit
• 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.
- 4 -
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this
service manual and its supplements and addenda, read
and follow the SAFETY PRECAUTIONS on page 3 of this
publication.
NOTE: If unforeseen circumstances create conflict
between the following servicing precautions and any of the
safety precautions on page 3 of this publication, always
follow the safety precautions. Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC
power source before;
a. Removing or reinstalling any component, circuit
board module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical
plug or other electrical connection.
c. Connecting a test substitute in parallel with an
electrolytic capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may
result in an explosion hazard.
d. Discharging the picture tube anode.
2. Test high voltage only by measuring it with an
appropriate high voltage meter or other voltage
measuring device (DVM, FETVOM, etc) equipped with
a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Discharge the picture tube anode only by (a) first
connecting one end of an insulated clip lead to the
degaussing or kine aquadag grounding system shield
at the point where the picture tube socket ground lead
is connected, and then (b) touch the other end of the
insulated clip lead to the picture tube anode button,
using an insulating handle to avoid personal contact
with high voltage.
4. Do not spray chemicals on or near this receiver or any
of its assemblies.
5. Unless specified otherwise in this service manual,
clean electrical contacts only by applying the following
mixture to the contacts with a pipe cleaner, cottontipped stick or comparable non-abrasive applicator;
10% (by volume) Acetone and 90% (by volume)
isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual,
lubrication of contacts in not required.
6. Do not defeat any plug/socket B+ voltage interlocks
with which receivers covered by this service manual
might be equipped.
7. Do not apply AC power to this instrument and/or any of
its electrical assemblies unless all solid-state device
heat sinks are correctly installed.
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.
9. Use with this receiver only the test fixtures specified in
this service manual.
CAUTION: Do not connect the test fixture ground strap
to any heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be
damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive (ES)
Devices. Examples of typical ES devices are integrated
circuits and some field-effect transistors and
semiconductor "chip" components. The following
techniques should be used to help reduce the incidence of
component damage caused by static by static electricity.
1. Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a
known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device,
which should be removed to prevent potential shock
reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with
ES devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic
charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or
unsolder ES devices.
4. Use only an anti-static type solder removal device.
Some solder removal devices not classified as "antistatic" can generate electrical charges sufficient to
damage ES devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its
protective package until immediately before you are
ready to install it. (Most replacement ES devices are
packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable
conductive material).
7. Immediately before removing the protective material
from the leads of a replacement ES device, touch the
protective material to the chassis or circuit assembly
into which the device will be installed.
CAUTION: Be sure no power is applied to the chassis
or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or
the lifting of your foot from a carpeted floor can
generate static electricity sufficient to damage an ES
device.)
- 5 -
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and
appropriate tip size and shape that will maintain tip
temperature within the range or 500。F to 600。F.
2. Use an appropriate gauge of RMA resin-core solder
composed of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a
mall wire-bristle (0.5 inch, or 1.25cm) brush with a
metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal
temperature.
(500。F to 600。F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static,
suction-type solder removal device or with solder
braid.
CAUTION: Work quickly to avoid overheating the
circuitboard printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal
temperature (500。F to 600。F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of
the component lead and the printed circuit foil, and
hold it there only until the solder flows onto and
around both the component lead and the foil.
CAUTION: Work quickly to avoid overheating the
circuit board printed foil.
d. Closely inspect the solder area and remove any
excess or splashed solder with a small wire-bristle
brush.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong)
through which the IC leads are inserted and then bent flat
against the circuit foil. When holes are the slotted type,
the following technique should be used to remove and
replace the IC. When working with boards using the
familiar round hole, use the standard technique as
outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation
by gently prying up on the lead with the soldering iron
tip as the solder melts.
2. Draw away the melted solder with an anti-static
suction-type solder removal device (or with solder
braid) before removing the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad
and solder it.
3. Clean the soldered areas with a small wire-bristle
brush. (It is not necessary to reapply acrylic coating to
the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as
close as possible to the component body.
2. Bend into a "U" shape the end of each of three leads
remaining on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the
corresponding leads extending from the circuit board
and crimp the "U" with long nose pliers to insure metal
to metal contact then solder each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor
leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the
circuit board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close
as possible to diode body.
2. Bend the two remaining leads perpendicular y to the
circuit board.
3. Observing diode polarity, wrap each lead of the new
diode around the corresponding lead on the circuit
board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder
joints of the two "original" leads. If they are not shiny,
reheat them and if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board
hollow stake.
2. Securely crimp the leads of replacement component
around notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the
replaced component and adjacent components and the
circuit board to prevent excessive component
temperatures.
- 6 -
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed
circuit board will weaken the adhesive that bonds the foil
to the circuit board causing the foil to separate from or
"lift-off" the board. The following guidelines and
procedures should be followed whenever this condition is
encountered.
At IC Connections
To repair a defective copper pattern at IC connections use
the following procedure to install a jumper wire on the
copper pattern side of the circuit board. (Use this
technique only on IC connections).
1. Carefully remove the damaged copper pattern with a
sharp knife. (Remove only as much copper as
absolutely necessary).
2. carefully scratch away the solder resist and acrylic
coating (if used) from the end of the remaining copper
pattern.
3. Bend a small "U" in one end of a small gauge jumper
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.
At Other Connections
Use the following technique to repair the defective copper
pattern at connections other than IC Pins. This technique
involves the installation of a jumper wire on the
component side of the circuit board.
1. Remove the defective copper pattern with a sharp
knife.
Remove at least 1/4 inch of copper, to ensure that a
hazardous condition will not exist if the jumper wire
opens.
2. Trace along the copper pattern from both sides of the
pattern break and locate the nearest component that is
directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead
of the nearest component on one side of the pattern
break to the lead of the nearest component on the
other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is
dressed so the it does not touch components or sharp
edges.
- 7 -
TIMING CHART
VIDEO
SYNC
F
E
C
A
B
D
MODE
H / V
Sync
Polarity
Dot
Clock
Frequency
Total
Period
( E )
Video
Active
Time ( A )
Sync
Duration
( D )
Front
Porch
( C )
Blanking
Time
( B )
Resolution
1 H(Pixels) - 28.321 31.468 900 720 18 108 54 720 X 400
V(Lines) + 70.08 449 400 12 2 35
2 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480
V(Lines) - 59.94 525 480 10 2 33
3 H(Pixels) - 31.5 37.5 840 640 16 64 120 640 x 480
V(Lines) - 75 500 480 1 3 16
4 H(Pixels) + 40.0 37.879 1056 800 40 128 88 800 x 600
V(Lines) + 60.317 628 600 1 4 23
5 H(Pixels) + 49.5 46.875 1056 800 16 80 160 800 x 600
V(Lines) + 75.0 625 600 1 3 21
6 H(Pixels) - 65.0 48.363 1344 1024 24 136 160 1024 x 768
V(Lines) - 60.0 806 768 3 6 29
7 H(Pixels) - 78.75 60.123 1312 1024 16 96 176 1024 x 768
V(Lines) - 75.029 800 768 1 3 28
8 H(Pixels) +/- 108.0 67.500 1600 1152 64 128 256 1152 x 864
V(Lines) +/- 75.000 900 864 1 3 32
9 H(Pixels) + 108.0 63.981 1688 1280 48 112 248 1280 x 1024
V(Lines) + 60.02 1066 1024 1 3 38
10 H(Pixels) + 135.0 79.976 1688 1280 16 144 248 1280 x 1024
V(Lines) + 75.035 1066 1024 1 3 38
11 H(Pixels) + 119 64.674 1840 1680 48 32 80 1680x1050
V(Lines) - 59.883 1080 1050 3 6 21
12 H(Pixels) - 146.25 65.290 2240 1680 104 176 280 1680x1050
V(Lines) + 59.954 1089 1050 3 6 30
- 8 -
DISASSEMBLY
# 1
# 3
Remove the screws.
# 2
1. Pull the front cover upward.
2. Then, let the all latches are separated.
# 4
# 5
1. Open the Cabinet latch with Jig.
2.
Disassemble Cabinet.
3. Put the front face down.
Disassemble Connector.
Disassemble back cover.
- 9 -
BLOCK DIAGRAM
Module
Vcc
L V D S
5V
LVDS
MStarACE
Scaler
Line Buffer
Tx
OSD
KEY
SSC
SDA
/SCL
3.3V
(System)
EEPROM
3.3V
Flash ROM
3.3V
12V
Regulator
15V
1.8V
L204WT
gm5726H
3.3V
ADC
TMDS Rx
Analog I(R/G/B)
(EDID)
EEPROM
D-Sub
MCU
1.8V
(EDID)
EEPROM
DVI(TMDS)
DVI-D
LIPS
5V
5V Regulator
12V
Filter
12V
12V
Inverter(12Lamps)
- 10 -
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 136MHz in L194WT/WTM/WTQ case(146MHz In L204WT/WTM/WTQ
CASE).
This part consists of the Scaler, ADC convertor, TMDS receiver and LVDS transmitter.
The Scaler gets the video signal converted analog to digital, interpolates input to 1440 X
900(L194WT/WTM/WTQ),1680X1050(L204WT/WTM/WTQ) 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, 5V is provided for LCD panel and micom in L194WT/WTM/WTQ case
15V is provided for inverter in L204WT/WTM/WTQ case
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 in L194WT/WTM/WTQ
case.
The inverter converts from DC15V to AC 700Vrms and operates back-light lamps of module in L204WT/WTM/WTQ
case.
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.
- 11 -
LIPS Board Block Diagram
50 ~ 60Hz
100KHz
OUTPUT RECTIFIER
AND FILTER
SIGNAL
Collection
and
Feedback
LINE
100 ~ 240V
EMI
COMPONENTS
INPUT RECTIFIER
AND FILTER
PWM
CONTROL
CIRCUIT
HVDC
ENERGY
TRANSFER
PHOTO-
COUPLER
ISOLATION
PRIMARY SECONDARY
Operation description_Power
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.
15V
5V
GND
3. Energy Transfer.
This part function is for 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 achieve the dc output stabilized, 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.
- 12 -
ADJUSTMENT
Windows EDID V1.0 User Manual
Operating System: MS Windows 98, 2000, XP
Port Setup: Windows 98 => Doesn’t need setup
Windows 2000, XP => Need to Port Setup.
This program is available for LCD Monitor only.
1. Port Setup
a) Copy “UserPort.sys” file to
“c:\WINNT\system32\drivers” folder
b) Run Userport.exe
c) Remove all default number
d) Add 300-3FF
2. EDID Read & Write
1) Run WinEDID.exe
2) Edit Week of Manufacture, Year of Manufacture,
Serial Number
a) Input User Info Data
b) Click “Update” button
c) Click “ Write” button
e) Click Start button.
f) Click Exit button.
- 13 -
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
15
10
5
5
69
1
1
1
14
13
25
6
5V
5V
5V
4.7K
4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
Video Signal
Generator
SERVICE OSD
1) Turn off the power switch at the right side of the display.
2) Wait for about 5 seconds and press MENU, POWER switch for 1 second interval.
3) The SVC OSD menu contains additional menus that the User OSD menu as described below.
a) CLEAR ETI : To initialize using time.
c) Auto Color : W/B balance and Automatically sets the gain and offset value.
(press key for over 3 sec)
d) AGING : Select Aging mode(on/off).
b) Module : To select applied module.
d) NVRAM INIT : EEPROM initialize.(24C16, press key for over 3 sec)
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)
Figure 1. Cable Connection
- 14 -
TROUBLESHOOTING GUIDE
NO POWER
(POWER INDICATOR OFF)
1. NO POWER
CHECK P702
1
2
13
14
VOLTAGE
PIN5, PIN6 (5V)?
YES
IS IC601 PIN2(1.8V)
IC602 PIN2(3.3V)
YES
CHECK IC501 PIN108
PULSE
YES
CHECK IC501
NO
NO
NO
CHECK POWER BOARD,
AND FIND OUT A SHORT
POINT AS OPENING
EACH POWER LINE
CHECK IC601(1.8V)
IC602(3.3V) LINE
CHECK CRYSTAL(X501)
1
P702-#5,6
Waveforms
2
IC601-#2
- 15 -
3
IC602-#2
4
IC501-#108
2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
NO RASTER
(OSD IS NOT DISPLAYED)
1
CHECK P702
VOLTAGE PIN5,6
NO
CHECK POWER BOARD
(LIPS)
(5V)?
YES
P702 PIN9 5V?
NO
CHECK IC501 INVERTER
ON/OFF PORT
YES
1. CONFIRM BRIGHTNESS
2
3
CHECK P702
PIN10 PIN11
NO
OSD CONTRL STATUS
2. CHECK MICOM DIM-ADJ
PORT
3. CHECK SCALER LAMPADJ
PORT(L204WT/WTM)
YES
CHECK
PULSE AS
4
CONTACTING PROBE
TO THE LAMP
NO
POWER BOARD (LIPS)
WIRE OF THE
LCD MODULE
YES
REPLACE LCD MODULE
3
P702-#11
Brightness 100 Brightness 0
1
3
- 16 -
Waveforms
P702-#5,6
P702-#11
2
P702-#10
4
Lamp current
3. NO RASTER (OSD IS NOT DISPLAYED) - MAIN
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK IC501
PIN2(3.3V)
PIN17(1.8V)
1
PIN89(H-SYNC) AND
IS PULSE APPEARED AT
TROUBLE IN CABLE
U501
PIN 108,109
14.3MHZ?
CHECK IC501
PIN90(V-SYNC).
SIGNAL PINS?
OR LCD MODULE
YES
YES
YES
NO
NO
NO
CHECK IC601(1.8V),
IC602(3.3V)
1. CHECK PIN 108,109
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN IC501
CHECK CONNECTION
LINE FROM D-SUB TO
IC501
1
IC501-#108
Waveforms
- 17 -
TROUBLE IN DPM
4. TROUBLE IN DPM
CHECK R720 AND
R726, SYNC
APPEARED?
YES
1
2
CHECK
IC501 PIN89,90
SYNC PULSE
YES
TROUBLE IN IC501
NO
NO
CHECK PC
PC IS GOING
INTO DPM MODE
CHECK H/V SYNC LINE
1
H-SYNC
Waveforms
2
V-SYNC
- 18 -
WIRING DIAGRAM
6631900034P
6631900109A
6631900030D
30P
6P
11P
- 19 -
120
EXPLODED VIEW
030
110
020
070
100
090
080
050
040
060
010
- 20 -
* Note: Safety mark
EXPLODED VIEW PARTS LIST
Ref. No.
010
020
030
040
050
060
070
080
090
100
110
120
Part No.
30919L0033B Cover Assembly, L204WT/WTM LM62B 20" SILVER-For Canada, U.S.A
30919L0033J Cover Assembly, L204WT/WTM LM62B 20" SILVER AUSTRALIA
30919L0033A Cover Assembly, L204WT/WTM LM62B 20" BLACK
EAJ30235801
3809900217A Cover Assembly, L204WT/WTQ ... 20" Black
35509K0346A Cover, L204 STAND BODY ABS
AAN30377501 Base Assembly, STAND L204WT LM57A SILVER Best-buy
3043900057A Base Assembly, L204 ... ABS-BLACK
EBR30204402 PCB Assembly, SUB S.T LM57G L204WT-BFQ KRDBQFN CONTORL TOTAL COMMON L294WT
6871TPT319C PCB Assembly,Power, 6-LAMP TV/MNT/MFT POWER TOTAL LIPS FOR 20.1 WIDE CPT
EBU30205203 Main Total Assembly, L204WTM-BFQ BRAND LM57G
35509K0345A Cover, L204 PIECE VESA
49509S0051B Plate, PRESS SBHG1-1 0.8 SHIELD SPC L204 D-SUB DVI
49509K0349A Plate, SHIELD GUIDE L204
6410TUW008A
or 6410TUW002F
6410TSW003A
LCD,Module-TFT, CLAA201WA03Q DRIVER 20.1INCH 1680X1050 300CD COLOR 72% 16/10 600:1 WSXGA+,6MS,160/160,6LAMP
Power Cord, UL_CSA,LP-31 & SVT 18X3C, LS-13_1.87M_BLK LP-31 LS-13 1.87M - 125V 10A SVT 3XAWG18 BLACK UL CSA N-For Canada, U.S.A
Power Cord, SP305 IS14 SVT 18AWGX3 CT-12_1.87M_BLK SP-305 IS-14 1.87M - 125V 10A SVT 3XAWG18 BLACK UL CSA N-For Canada, U.S.A
Power Cord, LP-23A+SAG18N<B10A&LS-13_1.87M_BLK LP-23A LS-13 1.87M - 250V 7.5A GFC-3R 3X0.75MM2 BLACK SAA N-For Australia
Description
- 21 -
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: 2006. 06. 02.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
MAIN BOARD
CAPACITORS
C502 0CC080CK11A C1608C0G1H080DT 8pF 0.5PF 50
C503 0CC080CK11A C1608C0G1H080DT 8pF 0.5PF 50
C504 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C505 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C506 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C507 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C508 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C509 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C510 0CC221CK41A C1608C0G1H221JT 220pF 5% 50V
C511 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C512 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C513 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C514 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C515 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C516 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C517 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C518 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C519 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C520 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C521 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C522 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C523 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C524 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C525 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C526 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C527 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C528 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C529 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C530 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C531 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C532 0CK473CH56A C1608X7R1E473KT 47nF 10% 25V
C534 0CE107EF610 KMG16VB100M 100uF 20% 16V 12
C535 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V
C561 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C601 0CK105CD56A C1608X7R1A105KT 1uF 10% 10V
C602 0CC102CK41A C1608C0G1H102JT 1nF 5% 50V C
C603 0CE227EF638 KMG5.0TP16VB220M 220uF 20% 1
C604 0CE107EF610 KMG16VB100M 100uF 20% 16V 12
C605 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C606 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C607 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C608 0CE107EF610 KMG16VB100M 100uF 20% 16V 12
C609 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C610 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C701 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C703 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V
C704 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V
C705 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C706 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C707 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V
C708 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C709 0CK104CK56A 0603B104K500CT 100nF 10% 50V
DATE: 2006. 06. 02.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
C710 0CC680CK41A C1608C0G1H680JT 68pF 5% 50V
C711 0CC680CK41A C1608C0G1H680JT 68pF 5% 50V
C712 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C713 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C714 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C715 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C716 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C717 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C718 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C719 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C720 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C721 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C722 0CC680CK41A C1608C0G1H680JT 68pF 5% 50V
C723 0CC680CK41A C1608C0G1H680JT 68pF 5% 50V
C724 0CK103CK51A 0603B103K500CT 10nF 10% 50V
C725 0CK103CK51A 0603B103K500CT 10nF 10% 50V
DIODEs
D520 0DD184009AA KDS184 KDS184 TP KEC - 85V D701 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D702 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D703 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D704 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D705 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D706 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D707 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D708 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D709 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D710 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D711 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS
D712 0DD184009AA KDS184 KDS184 TP KEC - 85V D713 0DD184009AA KDS184 KDS184 TP KEC - 85V D714 0DSON00138A MMBD301LT1G 600MV 30V - - 1.
D715 0DSON00138A MMBD301LT1G 600MV 30V - - 1.
ZD701 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD702 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD704 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD707 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD708 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD709 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD710 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ZD720 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V
ICs
IC501 EAN30386101 FE252GH-LF(GM5726H-LF-AB) 1.
IC502 0IMMRSG036B M24C16-WMN6TP 16KBIT 2KX8BIT
IC504 0IKE704200H KIA7042AP -0.3TO15V 4.2V 400
IC601 0IPMGSG020A LD1117DT18TR 3.3TO8V 1.8V 12
IC602 0IPMGA0010A AZ1117H-3.3 4.75TO10V 3.3V 0
IC701 0IMMR00014A M24C02-RMN6TP 2KBIT 256X8BIT
IC702 0IMMR00014A M24C02-RMN6TP 2KBIT 256X8BIT
- 22 -
DATE: 2006. 06. 02.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
TRANSISTOR
Q502 0TRDI80002A MMBT3904-(F) NPN 6V 60V 40V
Q503 0TRDI80002A MMBT3904-(F) NPN 6V 60V 40V
Q701 0TR390609FA KST3906-MTF PNP -5V -40V -40
Q702 0TR390609FA KST3906-MTF PNP -5V -40V -40
RESISTORs
R501 0RJ2001D677 MCR03EZPJ202 2KOHM 5% 1/10W
R503 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R504 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R507 0RJ2702D677 MCR03EZPJ273 27KOHM 5% 1/10W
R508 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R509 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W
R511 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R514 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R515 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R516 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R517 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R518 0RJ2400D677 MCR03EZPJ241 240OHM 5% 1/10W
R519 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R520 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R521 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R522 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R523 0RJ0562D677 MCR03EZPJ560 56OHM 5% 1/10W
R524 0RJ0562D677 MCR03EZPJ560 56OHM 5% 1/10W
R525 0RJ0562D677 MCR03EZPJ560 56OHM 5% 1/10W
R526 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W
R527 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W
R529 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W
R530 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R531 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W
R533 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1
R551 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W
R563 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R564 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R571 0RJ5601D677 MCR03EZPJ562 5.6KOHM 5% 1/10
R572 0RJ1102D677 MCR03EZPJ113 11KOHM 5% 1/10W
R573 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1
R574 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W
R601 0RJ2202D677 MCR03EZPJ223 22KOHM 5% 1/10W
R602 0RX0331K668 RSD02F4J3R30 3.3OHM 5% 2W 12
R604 0RJ5600D677 MCR03EZPJ561 560OHM 5% 1/10W
R620 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1
R621 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1
R704 0RJ4700D677 MCR03EZPJ471 470OHM 5% 1/10W
R705 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R706 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R707 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R708 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R709 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R710 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R711 0RJ4700D677 MCR03EZPJ471 470OHM 5% 1/10W
R712 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R713 0RJ0102D677 MCR03EZPJ100 10OHM 5% 1/10W
R714 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W
R715 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R716 0RJ0000D677 MCR03EZPJ000 0OHM 5% 1/10W 1
R717 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R719 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R720 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W
R721 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
DATE: 2006. 06. 02.
*S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION
R722 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R723 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R726 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W
R727 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R728 0RJ4700D677 MCR03EZPJ471 470OHM 5% 1/10W
R729 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R730 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R731 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
R732 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R733 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R734 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R735 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W
R736 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R737 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R738 0RJ0752D677 MCR03EZPJ750 75OHM 5% 1/10W
R739 0RJ0752D677 MCR03EZPJ750 75OHM 5% 1/10W
R740 0RJ0752D677 MCR03EZPJ750 75OHM 5% 1/10W
R741 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R742 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R743 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R751 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R752 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R753 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10
R761 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W
OTHERs
Q601 0TFVI80067A SI3865BDV(E3) N-CHANNEL MOSF
X501 6212AA2004F HC-49/U 14.31818MHZ 30PPM 14
CONTROL BOARD
LED1 0DLBE0048AA BL-HKBB533B-TRB SUPER YELLOW
C1 0CK104CK56A 0603B104K500CT 100nF 10% 50V
C2 0CK104CK56A 0603B104K500CT 100nF 10% 50V
R1 0RJ7501D677 MCR03EZPJ752 7.5KOHM 5% 1/10
R2 0RJ7501D677 MCR03EZPJ752 7.5KOHM 5% 1/10
R3 0RJ1201D677 MCR03EZPJ122 1.2KOHM 5% 1/10
R4 0RJ1201D677 MCR03EZPJ122 1.2KOHM 5% 1/10
R5 0RJ1801D677 MCR03EZPJ182 1.8KOHM 5% 1/10
SW1 6600R00004C JTP1127WEM 1C1P 15VDC 0.05A
SW2 6600R00004C JTP1127WEM 1C1P 15VDC 0.05A
SW3 6600R00004C JTP1127WEM 1C1P 15VDC 0.05A
SW4 6600R00004C JTP1127WEM 1C1P 15VDC 0.05A
SW5 6600R00004C JTP1127WEM 1C1P 15VDC 0.05A
- 23 -
SCHEMATIC DIAGRAM
1. SCALER
- 24 -
2. POWER
- 25 -
3. WAFER
- 26 -
Aug. 2006
P/NO : MFL34519502 Printed in China
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