TFT-LCD TV/MONITOR
Chassis Model
PD22JO LT22A13W
Manual
SERVICE
TFT-LCD TV/MONITOR CONTENTS
1. Precautions
2. Product Specifications
3. Disassembly & Reassembly
4. Alignment & Adjustments
5. Troubleshooting
6. Exploded View & Parts List
7. Electrical Parts List
8. Block Diagram
9. Wiring Diagram
10. Schematic Diagrams
11. Panel Description
CONFIDENTIAL
1-1-1 Warnings
1. For continued safety, do not attempt to modify the
circuit board.
2. Disconnect the AC power and DC Power Jack
before servicing.
1-1-2 Servicing the LCD Monitor
1. When servicing the LCD TV disconnect the AC line
cord from the AC outlet.
2. It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically.
1-1-3 Fire and Shock Hazard
Before returning the monitor to the user, perform the
following safety checks:
1. Inspect each lead dress to make certain that the
leads are not pinched or that hardware is not
lodged between the chassis and other metal parts in
the monitor.
2. Inspect all protective devices such as nonmetallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
3. Leakage Current Hot Check (Figure 1-1):
WARNING: Do not use an isolation transformer during
this test.
Use a leakage current tester or a metering system
that complies with American National Standards
Institute (ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories (UL
Publication UL1410, 59.7).
Figure 1-1. Leakage Current Test Circuit
4. With the unit completely reassembled, plug the AC
line cord directly into a 120V AC outlet. With the
unit’s AC switch first in the ON position and then
OFF, measure the current between a known earth
ground (metal water pipe, conduit, etc.) and all
exposed metal parts, including: metal cabinets,
screwheads and control shafts. The current
measured should not exceed 0.5 milliamp. Reverse
the power-plug prongs in the AC outlet and repeat
the test.
1-1-4 Product Safety Notices
Some electrical and mechanical parts have special
safety-related characteristics which are often not
evident from visual inspection. The protection they give
may not be obtained by replacing them with
components rated for higher voltage, wattage, etc. Parts
that have special safety characteristics are identified by
on schematics and parts lists. A substitute
replacement that does not have the same safety
characteristics as the recommended replacement part
might create shock, fire and/or other hazards. Product
safety is under review continuously and new
instructions are issued whenever appropriate.
LT22A13W 1-1
CONFIDENTIAL
1 Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential hazards such as
electrical shock.
1-1 Safety Precautions
DEVICE
UNDER
TEST
TEST ALL
EXPOSED METAL
SURFACES
(READING SHOULD
NOT BE ABOVE 0.5mA)
LEAKAGE
CURRENT
TESTER
2-WIRE CORD
ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
EARTH
GROUND
1-2-1 General Servicing Precautions
1. Always unplug the unit’s AC power cord from the
AC power source and disconnect the DC Power
Jack before attempting to:
(a) remove or reinstall any component or assembly,
(b) disconnect PCB plugs or connectors, (c) connect
a test component in parallel with an electrolytic
capacitor.
2. Some components are raised above the printed
circuit board for safety. An insulation tube or tape
is sometimes used. The internal wiring is
sometimes clamped to prevent contact with
thermally hot components. Reinstall all such
elements to their original position.
3. After servicing, always check that the screws,
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.
1. Immediately before handling any semiconductor
components or assemblies, drain the electrostatic
charge from your body by touching a known earth
ground. Alternatively, wear a discharging wriststrap device. To avoid a shock hazard, be sure to
remove the wrist strap before applying power to
the monitor.
2. After removing an ESD-equipped assembly, place it
on a conductive surface such as aluminum foil to
prevent accumulation of an electrostatic charge.
3. Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESDs.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs.
5. Use only an anti-static solder removal device. Some
solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage
ESDs.
4. Check the insulation between the blades of the AC
plug and accessible conductive parts (examples:
metal panels, input terminals and earphone jacks).
5. Insulation Checking Procedure: Disconnect the
power cord from the AC source and turn the power
switch ON. Connect an insulation resistance meter
(500 V) to the blades of the AC plug.
The insulation resistance between each blade of the
AC plug and accessible conductive parts (see
above) should be greater than 1 megohm.
6. Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instrument’s
ground lead last.
6. Do not remove a replacement ESD from its
protective package until you are ready to install it.
Most replacement ESDs are packaged with leads
that are electrically shorted together by conductive
foam, aluminum foil or other conductive materials.
7. Immediately before removing the protective
material from the leads of a replacement ESD,
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 body motions when handling
unpackaged replacement ESDs. Motions such as
brushing clothes together, or lifting your foot from
a carpeted floor can generate enough static
electricity to damage an ESD.
1 Precautions
1-2 LT22A13W
CONFIDENTIAL
1-3 Electrostatically Sensitive Devices (ESD) Precautions
Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly
called Electrostatically Sensitive Devices (ESD). Examples of typical ESD are integrated circuits and some field-effect
transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
1-2 Servicing Precautions
WARNING: An electrolytic capacitor installed with the wrong polarity might explode.
Caution: Before servicing units covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note: If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
LCD Panel TFT-LCD panel, RGB vertical stripe, normally
Black, 22-Inch viewable, 0.381 mm pixel pitch
Scanning Frequency Horizontal : 30 kHz ~ 61 kHz (Automatic)
Vertical : 56 Hz ~ 75 Hz (Automatic)
Display Colors 16.7 Million colors
Maximum Resolution Horizontal : 1280 Pixels
Vertical : 720 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 Ω, internally terminated
Input Sync Signal Type : Separate H/V
Level : TTL level
Maximum Pixel Clock rate 70 MHz
Active Display
Horizontal/Vertical
AC power voltage & Frequency
AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 120 W (Max)
Dimensions
Unit (W x D x H) 23.6 x 7.3 x 18.4 Inches (600 x 185 x 468 mm)
Carton (W x D x H) 27.6 x 21.8 x 10.2 Inches (702 x 553 x 260 mm)
Weight (Unit/Gross) 8.8 Kg (19.4 Ibs) / 15.3 Kg (33.7 Ibs)
Environmental Considerations Operating Temperature : 50 °F ~ 104 °F (10 °C ~ 40 °C)
Humidity : 10 % ~ 80 %
Storage Temperature : -4 °F ~ 113 °F (-20 °C ~ 45 °C)
Humidity : 5 % ~ 95 %
TV System
Antenna Input 75Ω, Coaxial Cable
– MAX Internal speaker Out : Right => 7W
Left => 7W
Sound Characteristic – Woofer Speaker (option) : 500mV RMS at 20~150 Hz
– BASS Control Range : -12 dB~ + 12 dB
– TREBLE Control Range : -12 dB~ + 12 dB
– Headphone Out: 5mW max (400m Vrms)
– Output Frequency : RF => 80 Hz ~ 15 kHz
A/V => 80 Hz ~ 15 kHz
LT22A13W 2-1
Item
Description
487.68 mm / 274.32 mm
Tuning Frequency Synthesize
System NTSC-M
Sound STEREO
CONFIDENTIAL
2 Product Specifications
2-2 LT22A13W
2-2 Pin Assignments
2-2-1 DVI-I (Analog & Digital)
(Ref) DVI-D : Digital only
D-SUB : Analog only
Pin No.
Signal Assignment
Pin No.
Signal Assignment
Pin No.
Signal Assignment
1
2
3
4
5
6
7
8
9
10
11
T.M.D.S. Data2T.M.D.S. Data2+
T.M.D.S. Data2/4 Shield
T.M.D.S. Data4T.M.D.S. Data4+
DDC Clock
DDC Data
Analog Vertical Sync.
T.M.D.S. Data1T.M.D.S. Data1+
T.M.D.S. Data1/3 Shield
12
13
14
15
16
17
18
19
20
21
T.M.D.S. Data3T.M.D.S. Data3+
+5V Power
Ground
(return for +5V, HSync. and VSync.)
Hot Plug Detect
T.M.D.S. Data0T.M.D.S. Data0+
T.M.D.S. Data0/5 Shield
T.M.D.S. Data5T.M.D.S. Data5+
22
23
24
C1
C2
C3
C4
C5
T.M.D.S. Clock Shield
T.M.D.S. Clock+
T.M.D.S. ClockAnalog Red
Analog Green
Analog Blue
Analog Horizontal Sync.
Analog Ground
(analog R,G&B return)
1234567 8
9 10111213141516
17 18 19 20 21 21 22 23
C1 C2
C3 C4
DVI-I Receptacle Connector Front View
2-2-2 DVI-I (Digital video interface)
Table 2-1 Combined analog and digital connector pin assignments
2 Product Specifications
LT22A13W 2-5
CONFIDENTIAL
2-3 Timing Chart
This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
2-3-1 LCD Panel Mode : 1 mode
✻ N/I : Non-Interlaced, I : Interlaced
LT22A13W 3-1
CONFIDENTIAL
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LT22A13W monitor.
WARNING: This monitor contains electrostatically sensitive devices. Use caution when handling
these components.
3-1 Disassembly
Cautions:1. Disconnect the monitor from the power source before disassembly.
2. Follow these directions carefully; never use metal instruments to pry apart the cabinet.
1. Remove 4 screws from the rear cover.
2. Remove the stand from LCD-TV.
3. Remove 1 screw from the rear cover.
CONFIDENTIAL
3 Disassembly and Reassembly
3-2 LT22A13W
3-2 Reassembly
Reassembly procedures are in the reverse order of disassembly procedures.
4. Insert a screw driver into the right and left
holes on the stand’s upper groove
respectively. Lift up the right & left side.
5. Pull the rear cover.
CONFIDENTIAL
LT22A13W 4-1
4 Alignments and Adjustments
4-1 General Alignment Instuction
1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation.
Check the basic characteristics such as height, horizontal and vertical sync.
2. Use the specified test equipment or its equivalent.
3. Correct impedance matching is essential.
4. Avoid overload. Excessive signal from a sweep generator might overload the front-end
of the TV. When inserting signal markers, do not allow the marker generator to distort
test result.
5. Connect the TV only to an DC power source with voltage and frequency as specified on
the backcover nameplate.
6. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure
that the power cord is disconnected before replacing any parts.
7. To protect aganist shock hazard, use an isolation transformer.
4 Alignments and Adjustments
4-2 LT22A13W
CONFIDENTIAL
4-2 Factory Mode Adjustments
4-2-1 Entering Factory Mode
1. To enter “Service Mode” Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
- If you have Factory remote - control
4-2-2 Factory Mode Tree
CONFIDENTIAL
LT22A13W 5-1
5 Troubleshooting
5-1 No Power
Does proper DC 14V
appear at Pin 1 of CN923?
Check SMPS’s part and adapter.
Yes
No
No
No
No
No
No
No
No
No
IC811 is bad.
Change main assy.
(BN94-00397A)
IC802 is bad.
Change main assy.
(BN94-00397A)
IC805 is bad.
Change main assy.
(BN94-00397A)
IC806 is bad.
Change main assy.
(BN94-00397A)
IC812 is bad.
Change main assy.
(BN94-00397A)
IC804 or IC967 are bad.
Change main assy.
(BN94-00397A)
IC807 is bad.
Change main assy.
(BN94-00397A)
IC803 is bad.
Change main assy.
(BN94-00397A)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Does proper DC 3.3V_A
appear at Pin 2 of IC811?
Does proper DC 2.5V_A
appear at Pin 3 of IC802?
Does proper DC 3.3V_B
appear at Pin 1 of IC805?
Does proper DC 2.5V_B
appear at Pin 3 of IC806?
Does proper DC 5V_A
appear at Pin 2 of IC812?
Does proper DC 5V_A
appear at Pin 2 of
IC804 and Pin 2 of IC967?
Does proper DC 12V
appear at Pin 2 of IC807?
Does proper DC 8V_A
appear at Pin 3 of IC803?
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
5 Troubleshooting
LT22A13W 5-3
CONFIDENTIAL
5-2 No Video (PC Signal)
Power indicator is green.
Yes
Replace the LCD_Panel with new one.
Yes
No
Check CN714 and
FFC(BN41-00240A) cable.
Does the signal
appear at C491, C489,
C488, R424 and R425 of
R, G, B, H, V?
Yes
No
IC350 is bad.
Change main PCB assy.
(BN94-00397A)
R354 is bad.
Change main PCB assy.
(BN94-00397A)
Check is X201.
IC200 is bad.
Change main PCB assy.
(BN94-00397A)
RA301~RA306 are bad.
Change main PCB assy.
(BN94-00397A)
Does the signal appear at
IC956 ~ IC961?
Yes
No
Does the signal
appear at R354?
Yes
No
Does the clock pulse
appear at X201?
Yes
No
Does the signal appear at
RA301~RA306?
Yes
No
Power indicator is green.
Does the signal
appear at CN924?
2-1
2-3
2-2
2-4
2-5
2-6
2-7
2-8
2-9
2-10
CONFIDENTIAL
5 Troubleshooting
LT22A13W 5-5
Replace the LCD_Panel with new one.
5-3 No Picture (Tuner CVBS, AV CVBS, S-Video)
No
Check CN712 and
FFC(3809-001406) cable.
Does the signal
appear at C744(Tuner),
C746(AV), C747(SVHS_Y)
and C748(SVHS_C)?
Yes
No
IC722 is bad.
Change main PCB assy.
(BN94-00397A)
IC200 is bad.
Change main PCB assy.
(BN94-00397A)
Check is X201
IC200 is bad.
Change main PCB assy.
(BN94-00397A)
RA301~RA306 are bad.
Change main PCB assy.
(BN94-00397A)
Does the signal appear
at R214(Tuner), R215(AV),
R219(SVHS_Y) and
R224(SVHS_C) in IC722?
Yes
No
Does the signal
appear at R308(Blue),
R310(Green) and R311(Red)?
Yes
3-1
3-3
3-2
3-4
3-5
3-7
3-6
3-8
3-9
3-11
3-10
Yes
No
Does the clock pulse
appear at X201?
Yes
No
Does the signal appear at
RA301~RA306?
Yes
No
Power indicator is green.
Does the signal
appear at CN924?
3-12
3-13
3-14
5 Troubleshooting
LT22A13W 5-7
CONFIDENTIAL
Replace the LCD_Panel with new one.
5-4 No Picture (DVD, DTV)
No
No
No
Check CN713 and
FFC(3809-001406) cable.
Check CN713 and
FFC(3809-001406) cable.
Does the signal
appear at C437,
C438, C439(DVD)
and C435, C432?
Yes
Check IC350 is bad.
Change main PCB assy.
(BN94-00397A)
No
Check R354 is bad.
Change main PCB assy.
(BN94-00397A)
No
Check is X201.
IC200 is bad
Change main PCB assy.
(BN94-00397A)
No
RA301~RA306 are bad.
Change main PCB assy.
(BN94-00397A)
Does the signal appear at
C493, C403 and C483?
Yes
Yes
4-1
4-3
4-2
4-4
4-5 4-6
4-7
4-9
4-8
Yes
Does the signal
appear at R354?
Does the signal appear at
IC956~IC961?
Yes
does the clock pulse
appear at X201?
Yes
Does the signal appear at
RA301~RA306?
4-11
4-12
4-13
Yes
No
Power indicator is green.
Does the signal
appear at CN924?
4-14
4-10
5 Troubleshooting
LT22A13W 5-9
CONFIDENTIAL
5-5 No Sound
No
Check CN714 and
FFC(BN41-00240A) cable.
Check CN715 and
FFC(3809-001407) cable.
Does the signal appear at
P24(SIF) in CN714 and P2,
P3(AV_R,L), P5, P18(comp1_L,R),
P20, P21(comp2_L,R), P23,
P24(PC_L,R) in CN715?
Yes
No
IC919 are bad.
Change main PCB assy.
(BN94-00397A)
IC501 is bad.
Change main PCB assy.
(BN94-00397A)
Does the signal appear at
P67(Tuner) and P47, P48(PC) and
P56, P57(VCR) and P53, P54(DVD)
and P50, P51(DTV) in IC919?
Yes
5-1
5-2
Yes
No
Does the signal appear at
L501~L504?
Replace the speaker.
5-3
ItemNo DesignLOC 품명 Spec SERVICE
LT22A13WX/XSJ
EL-LT22A13WX/XSJ - 1 SEC,W1-L01 BN90-00401A - ASSYSTAND PD22JO,JAPAN,PD22JO-WXA6/8080 SNA
BN96-00127B STD ASSYSTANDP POSEIDON22,ABSVO,GR81,DGM2188 SNA
6003-000122 STD SCREW-TAPTITE BH,+,B,M4,L12,ZPC(YEL),SWRCH18
6003-001337 STD SCREW-TAPTITE CH,+,S,M4,L6,ZPC(YEL),SWRCH18A,- SNA
BN61-00099A STD STAND-ACETAL,A APOLLO29,ACETAL SNA
BN61-00104A STD STAND-ROLLERSHAFT APOLLO29,FORGING. SNA
BN61-00105A STD STAND-ROLLER APOLLO29,PE SNA
BN61-00228A STD STAND-COVER POSEIDON22,ABSVOGR81 SNA
BN61-00229A STD STAND-BRKT POSEIDON22,SECC,T1.2 SNA
BN61-00230A STD STAND-BRKTSUPPORT-R POSEIDON22,SECC,T2.0 SNA
BN61-00231A STD STAND-BRKTSUPPORT-L POSEIDON22,SECC,T2.0 SNA
BN61-00233A STD STAND-SWIVEL POSEIDON22,ABSHB,BK12 SNA
BN61-00234A STD STAND-RUBBER POSEIDON22,NEOPRENE,T1.6,BLACK SNA
BN90-00418A - ASSYCOVERREAR PD22JO,JAPAN,PD22JO-WXA6/8080 SNA
6003-000009 C/R+STAND SCREW-TAPTITE BH,+,B,M4,L16,ZPC(YEL),SWRCH18 SNA
BN63-00389C C/R COVER-REARJAPAN POSEIDON22,ABSVOGR81,JAPAN SNA
BN90-00433A - ASSYCOVERFRONT PD22JO,JAPAN,PD22JO-WXA6/8080 SNA
6003-000009 C/F+C/R SCREW-TAPTITE BH,+,B,M4,L16,ZPC(YEL),SWRCH18 SNA
BN64-00111A C/F KNOB-POWER POSEIDON22,ABS+PCIV16,IV16
BN96-00128B C/F ASSYCOVERP-FRONT POSEIDON22,ABSVO,GR81,BLM6238+CN2129,SVM6145+CN2129
0203-001131 CIS TAPE-DOUBLEFACE #4949,T1.1,W12,L20,BLK SNA
6003-001188 C/F SCREW-TAPTITE BH,+,B,M4,L10,YEL,SWRCH18A SNA
BN59-00280A C/F BOARD-FUNCTIONASS'Y AL29AO,FUNCTIONASS'Y SNA
BN61-00160A C/F HOLDER-CAP MO15PS,PE,T1.0,30,30,NTR,DAHC-20 SNA
BN63-00387A C/F COVER-FRONT POSEIDON22,ABS+PC,ABS SNA
BN63-00388A C/F COVER-GRILL POSEIDON22,ABSVOGR81 SNA
BN63-00546A CIS SHEET-BARRIER PD22",55,265.3,PETT0.35CLR SNA
BN63-00547A CIS SHIELD-FRONTCOVER PD22",SPTE,T0.2 SNA
BN64-00061A C/F KNOB-RING APOLLO29,ABS,HB,CLEAR SNA
BN64-00099C C/F BADGE-BRAND POSEIDON,AL,T1.5,8.5,50,BLM-6238,SAMSUNG(LAYERGLOSS) SNA
BN64-00110A C/F KNOB-FUNCTION POSEIDON22,ABSHBIV16,IV16
BN67-00055A C/F LENS-LED APOLLO29,ACRYL,CLEAR SNA
BN67-00056A C/F LENS-MIRROR APOLLO29,ACRYL,CLEAR,ALCOATING
BN67-00070A C/F LENS-IR APOLLO29,ACRYL,CLEAR
BN96-00176A C/F ASSYSPEAKERP 8OHM,10W,RIGHTSPEAK(3P650MM)
BN96-00177A C/F ASSYSPEAKERP 8OHM,10W,LEFTSPEAK(2P220MM)
BN91-00310H - ASSYMISC PD22JO SNA
BN44-00051E CIS ADAPTOR PSCV121101S,POSEIDON,100240VAC,50/60HZ,14V,8A,120W,120W,AC/DC,-10TO+40[C],20
BN91-00388L - ASSYLCD PD22KO SNA
BN07-00074A CIS LCD LTA220W1-L01,ES17AS,1280*720,525.6*307.9*30.6,16.7M,56,0.264*0.264,055,5.0,TN,BN91-00532A - ASSYCHASSIS PD22JO,JAPAN,PD22JO-WXA6/8080
BN94-00393A - ASSYPCBMAIN PD22JO,JAPAN,PD22JO-WXA6/8080 SNA
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