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Chassis: MB15U*,MB15J* ;
Model: LTM1525, LT15S13C
Service Manual
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CONFIDENTIAL
TFT-LCD TV/MONITOR
Chassis Model
MB15U* LTM1525
MB15J* LT15S13C
SERVICE Manual
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 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
1-1-1 Warnings
1. For continued safety, do not attempt to modify the
(READING SHOULD
circuit board. NOT BE ABOVE 0.5mA)
2. Disconnect the AC power and DC Power Jack
before servicing. DEVICE
LEAKAGE
CURRENT
UNDER TESTER
1-1-2 Servicing the LCD Monitor TEST
TEST ALL
EXPOSED METAL
1. When servicing the LCD Monitor Disconnect the SURFACES
AC line cord from the AC outlet.
2-WIRE CORD
2. It is essential that service technicians have an
accurate voltage meter available at all times. Check
the calibration of this meter periodically. ALSO TEST WITH
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED) EARTH
1-1-3 Fire and Shock Hazard GROUND
Before returning the monitor to the user, perform the Figure 1-1. Leakage Current Test Circuit
following safety checks:
1. Inspect each lead dress to make certain that the 4. With the unit completely reassembled, plug the AC
leads are not pinched or that hardware is not line cord directly into a 120V AC outlet. With the
lodged between the chassis and other metal parts in unit's AC switch first in the ON position and then
the monitor. OFF, measure the current between a known earth
2. Inspect all protective devices such as nonmetallic ground (metal water pipe, conduit, etc.) and all
control knobs, insulating materials, cabinet backs, exposed metal parts, including: metal cabinets,
adjustment and compartment covers or shields, screwheads and control shafts. The current
isolation resistor-capacitor networks, mechanical measured should not exceed 0.5 milliamp. Reverse
insulators, etc. the power-plug prongs in the AC outlet and repeat
3. Leakage Current Hot Check (Figure 1-1): the test.
WARNING: Do not use an isolation transformer during
this test. 1-1-4 Product Safety Notices
Use a leakage current tester or a metering system
Some electrical and mechanical parts have special
that complies with American National Standards
safety-related characteristics which are often not
Institute (ANSI C101.1, Leakage Current for
evident from visual inspection. The protection they give
Appliances), and Underwriters Laboratories (UL may not be obtained by replacing them with
Publication UL1410, 59.7). 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.
LTM1525/LT15S13C 1-1
1 Precautions
CONFIDENTIAL
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.
1-2-1 General Servicing Precautions
1. Always unplug the unit's AC power cord from the 4. Check the insulation between the blades of the AC
AC power source and disconnect the DC Power plug and accessible conductive parts (examples:
Jack before attempting to: metal panels, input terminals and earphone jacks).
(a) remove or reinstall any component or assembly, 5. Insulation Checking Procedure: Disconnect the
(b) disconnect PCB plugs or connectors, (c) connect power cord from the AC source and turn the power
a test component in parallel with an electrolytic switch ON. Connect an insulation resistance meter
capacitor. (500 V) to the blades of the AC plug.
2. Some components are raised above the printed The insulation resistance between each blade of the
circuit board for safety. An insulation tube or tape AC plug and accessible conductive parts (see
is sometimes used. The internal wiring is above) should be greater than 1 megohm.
sometimes clamped to prevent contact with
6. Always connect a test instrument's ground lead to
thermally hot components. Reinstall all such
the instrument chassis ground before connecting
elements to their original position.
the positive lead; always remove the instrument's
3. After servicing, always check that the screws, ground lead last.
components and wiring have been correctly
reinstalled. Make sure that the area around the
serviced part has not been damaged.
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 devices are integrated circuits and some field-
effect transistors. The following techniques will reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor 6. Do not remove a replacement ESD from its
components or assemblies, drain the electrostatic protective package until you are ready to install it.
charge from your body by touching a known earth Most replacement ESDs are packaged with leads
ground. Alternatively, wear a discharging wrist- that are electrically shorted together by conductive
strap device. To avoid a shock hazard, be sure to foam, aluminum foil or other conductive materials.
remove the wrist strap before applying power to 7. Immediately before removing the protective
the monitor. material from the leads of a replacement ESD,
2. After removing an ESD-equipped assembly, place it touch the protective material to the chassis or
on a conductive surface such as aluminum foil to circuit assembly into which the device will be
prevent accumulation of an electrostatic charge. installed.
3. Do not use freon-propelled chemicals. These can Caution: Be sure no power is applied to the
generate electrical charges sufficient to damage chassis or circuit and observe all
ESDs. other safety precautions.
4. Use only a grounded-tip soldering iron to solder or
desolder ESDs. 8. Minimize body motions when handling
unpackaged replacement ESDs. Motions such as
5. Use only an anti-static solder removal device. Some brushing clothes together, or lifting your foot from
solder removal devices not classified as "anti-static" a carpeted floor can generate enough static
can generate electrical charges sufficient to damage electricity to damage an ESD.
ESDs.
1-2 LTM1525/LT15S13C
CONFIDENTIAL
2 Product Specifications
2-1 Specifications
Item Description
LCD Panel TFT-LCD panel, RGB vertical stripe, normaly white, 15-Inch viewable, 0.297 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 : 1024 Pixels
Vertical : 768 Pixels
Input Video Signal Analog 0.7 Vp-p ± 5% positive at 75 , internally terminated
Input Sync Signal Type : Seperate H/V
Level : TTL level
Maximum Pixel Clock rate 80 MHz
Active Display
304.1 mm / 228.1 mm
Horizontal/Vertical
AC power voltage & Frequency AC 90 ~ 264 Volts, 60 / 50 Hz ± 3 Hz
Power Consumption 45 W (Max)
Dimensions
Unit (W x D x H) 13.6 x 6.7 x 14.2 Inches (346.0 x 169.0 x 361.5 mm)
Carton (W x D x H) 16.8 x 4.5 x 21.0 Inches (427 x 114 x 535 mm)
Weight 3.2 Kg / 7.05 Ibs (With Stand)
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 %
Tunning Frequency Synthesize
TV System System NTSC-M
Sound STEREO
Antena Input 75, Coaxial Cable
MAX Internal speaker Output : Right => 3W
Left => 3W
Sound Characteristic
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
LTM1525/LT15S13C 2-1
2 Product Specifications
CONFIDENTIAL
2-2 Pin Assignments
2-2-1 D-SUB 2-2-2 DVD, DTV
Pin Separate Y
RCA Green
1 Red GND
2 Green
3 Blue Pb (Cb)
4 GND RCA Blue
GND
5 GND (DDC Return)
6 GND-Red Pr (Cr)
7 GND-Green RCA Red
8 GND-Blue GND
9 No Connection
Audio L
10 GND-Sync./Self Test
RCA White
11 GND GND
12 DDC Data
13 H-Sync. Audio R
14 V-Sync. RCA Red
15 DDC Clock GND
2-2-3 S-Video 2-2-4 A/V
Pin Separate RCA Yellow CVBS
1 GND Audio L
2 Y RCA White
3 C GND
4 GND
Audio R
5 GND RCA Red
GND
2-2 LTM1525/LT15S13C
2 Product Specifications
CONFIDENTIAL
2-2-5 D4 CONNECTOR
Pin Separate
1 Y
2 Y_GND
3 Pb
4 Pb_GNd
5 Pr
6 Pr_GNd
7 Preliminary Line1
8 Line1
9 Line5
10 Preliminary Line2
11 Line3
12 Switch GND
13 Prlimainary Line3
14 Switch
Line 1 Line2 Line3
(Resolution) (i/p) (Aspect)
5V 1080 60p 16 : 9
2.2V 720 - letter box
0V 480 60i 4:3
LTM1525/LT15S13C 2-3
2 Product Specifications
CONFIDENTIAL
2-4 LTM1525/LT15S13C
2 Product Specifications
CONFIDENTIAL
LTM1525/LT15S13C 2-5
2 Product Specifications
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
µs
µs
µs
µs
µs
µs
µs
µs
2-6 LTM1525/LT15S13C
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (1)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
LTM1525/LT15S13C 2-7
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (2)
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
µs µs µs µs µs
2-8 LTM1525/LT15S13C
2 Product Specifications
CONFIDENTIAL
2-3-2 Supported Modes (3)
s
s
s
s
s
s
s
s
LTM1525/LT15S13C 2-9
2 Product Specifications
CONFIDENTIAL
Memo
2-10 LTM1525/LT15S13C
CONFIDENTIAL
3 Disassembly and Reassembly
This section of the service manual describes the disassembly and reassembly procedures for the
LTM1525/LT15S13C 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. The stand is held into the bottom of the unit
by a pair of retaining clips (near the left and
right hinges) To remove the stand, simply pull
it away from the unit and the retaining clips
will release automatically.
2. Remove the two phillips screws (left and
right).
3. Separate the case halves (front/back) starting
at the bottom/edges.
LTM1525/LT15S13C 3-1
3 Disassembly and Reassembly
CONFIDENTIAL
3-2 Reassembly
Reassembly procedures are in the reverse order of Disassembly procedures.
3-2 LTM1525/LT15S13C
CONFIDENTIAL
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 transform.
LTM1525/LT15S13C 4-1
4 Alignments and Adjustments
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 (U.S. Only)
127 75
RF
127 75
130 82
218 DA
OE 195 C3
248 F8
0 6 / 2 4 T- M B 0 1 - 1 0 2 208 DO
160 B7
160 68
120 70
133 85
OE
0 6 / 2 4 T- M B 0 1 - 1 0 2
4-2 LTM1525/LT15S13C
4 Alignments and Adjustments
CONFIDENTIAL
OE
0 6 / 2 4 T- M B 0 1 - 1 0 2
OE
15
0 6 / 2 4 T- M B 0 1 - 1 0 2
OE
0 6 / 2 4 T- M B 0 1 - 1 0 2
OE
0 6 / 2 4 T- M B 0 1 - 1 0 2
LTM1525/LT15S13C 4-3
4 Alignments and Adjustments
CONFIDENTIAL
4-2-3 Factory Mode Tree (Japan Only)
127 75
RF
127 75
130 82
218 DA
O4 195 C3
248 F8
0 6 / 2 4 T- M B 0 3 - 1 0 2 208 DO
160 B7
160 68
120 70
133 85
O4
0 6 / 2 4 T- M B 0 3 - 1 0 2
4-4 LTM1525/LT15S13C
4 Alignments and Adjustments
CONFIDENTIAL
04
0 6 / 2 4 T- M B 0 3 - 1 0 2
04
15
0 6 / 2 4 T- M B 0 3 - 1 0 2
04
0 6 / 2 4 T- M B 0 3 - 1 0 2
04
0 6 / 2 4 T- M B 0 3 - 1 0 2
LTM1525/LT15S13C 4-5
4 Alignments and Adjustments
CONFIDENTIAL
Memo
4-6 LTM1525/LT15S13C
CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 14V appear at DC No WAVEFORMS
Check SMPS PCB and Adapter.
jack connected to CN801?
1 IC811 #2
Yes
Does proper DC 3.3V_A No
Check IC811.
appear at FT852?
Yes
Does proper DC 2.5V_A No
Check IC802.
appear at Pin 3 of IC802?
2 IC805 #1
Yes
Does proper DC 3.3V_B No
Check IC805.
appear at T807?
Yes
Does proper DC 2.5V_B No
Check IC806.
appear at Pin 4 of IC806?
3 IC812 #2
Yes
Check IC812.
LTM1525/LT15S13C 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Signal)
WAVEFORMS
Power indicator is green.
4 C491
Yes
Does the signal appear No
at C491, C489, C488 Check CN401 and cable.
of R, G, B input?
Yes
Does the clock pulse No
appear at output of Check related circuit of IC350.
T201, T202, T203 ~ RA356? 5 R354
Yes
Does the clock pulse No Check R354 and related
appear at R354? circuit of R354.
Yes
6 X201
Does the clock pulse No Check X201 and related
appear at X201? circuit of X201.
Yes
Does the clock pulse appear at No
Replace RA301 ~ RA306, IC300.
output of RA301~RA306?
Yes
Replace LCD Panel.
5-2 LTM1525/LT15S13C
5 Troubleshooting
CONFIDENTIAL
5-3 No Picture (TV, Video, S-Video, DVD, DTV)
WAVEFORMS
Check Pin 185, 196 (S-Video) No 7 CN828 #16
Check Pin 16 of CN828
and Pin 184 (VCR) and Pin 183
at TV color bar.
(RF-CVBS) of IC200 (DPTV_3D)?
Yes
Check analog RGB out Pin 27, 28, No
29 and check 3.3V_RA Pin 199, Check the IC813 and IC200.
181, 192, 194, 205 at IC200?
Yes
Check the IC200, C285, C241 and C249.
LTM1525/LT15S13C 5-3
5 Troubleshooting
CONFIDENTIAL
5-4 No Sound
Does the signal appear at
Pin 67 (Tuner sound signal) and
No Check the CN401(PC Sound) and the
Pin 47, 48 (PC sound) and Pin 56, 57 SK3(VCR Sound) and the SK2
(VCR sound) and Pin 50, 51 (DVD) (DVD/DTV Sound) the CN828(Tuner). WAVEFORMS
of IC 919 (MSP3421)?
8 IC919 #3
Yes
Does the signal appear at Pin 27, No Check the Pin 3 of IC919 and
28 of IC919 (MSP3421)? related circuit of IC919.
Yes
Does the signal appear No Check the IC503 (Audio amp) and
at R505, R506? related circuit of IC503.
Yes
Replace the speaker.
5-4 LTM1525/LT15S13C
CONFIDENTIAL
6 Exploded View and Parts List
LTM1525/LT15S13C 6-1
6 Exploded View & Parts List
CONFIDENTIAL
Memo
6-2 LTM1525/LT15S13C
CONFIDENTIAL
8 Block Diagram
LTM1525/LT15S13C 8-1
8 Block Diagrams
CONFIDENTIAL
8-2 LTM1525/LT15S13C
9-1
CONFIDENTIAL
+5V_A
SPK OUT R +
SPK OUT R -
SPK OUTL +
COMP_Y
SPK OUTL -
HP_IDENT
GND
HP_R
HP_L
GND
GND
GND
GND
GND
NC
COMP_Pb
GND
COMP_Pr
CN501
CN502
CN511
GND
PC_RIN
GND
PC_LIN
+3.3V_A
PC_INT
H_SYNC
V_SYNC
CN575
GND
BLUE 16
GND 17
GREEN 18
GND 19
RED 20
GND 21
POWER_KEY 22
DDC_CLK 23
DDC_DATA 24
DDC_5V 25
GND 26
GND 27
GND 28
+3.3V
GND 29
+3.3V
GND 30
LUDS GND
GND 31
GND
TXO -
TXO +
GND
CN706_1
TX1-
GND
CN901
TX1+
KEY2
GND
KEY1
TX2-
TX2+
GND
14 TXCLK-
TXCLK+
16 GND
TX3-
TX3-
GND
GAMMA
+5V
TUNER_GND
TUNER_CVBS
SCL 2
SDA 2
GND
SIF
LED
IR
CN505
GND
AVI_R
AVI_L
CN701
CN754
+8V
9 Wiring Diagram
GND
COMP_RIN
9-1 Main Diagram
COMP_LIN 16
BRIGHT CONTROL
INVERTER ON/0FF
LTM1525/LT15S13C
GND 17
CUBS 18
S_VIDEO_Y 19
+14V
+14V
+14V
GND
GND
GND
GND
GND
GND
GND
GND
VCC
VCC
VCC
VCC
NC
NC
NC
GND 20
S_VIDEO_C 21
LTM1525/LT15S13C
CONFIDENTIAL
RED
GREEN
BLUE
+5V_A GND
COMP_Y GND
GND GND
CN401
COMP_Pb
GND
GND GND
COMP_Pr NC
GND PC_IDENT
PC_RIN GND
GND DDC_DATA
PC_LIN H_SYNC
+3.3V_A V_SYNC
PC_INT DDC_CLK
H_SYNC
V_SYNC GND
CN575
GND PC_LIN
CN403
BLUE PC_RIN
GND PC_LIN
GREEN PC_RIN
GND
RED
GND
GND
COMP-LIN
POWER_KEY
GND
DDC_CLK
SK2
GND
DDC_DATA
COMP-RIN
DDC_5V
GND
GND
GND
GND
GND
COMP-Pr
GND
COMP-Pr
GND
GND
GND
COMP-Pb
SK1
COMP-Pb
GND
COMP-Y
COMP-Y
GND
+5V AUDIO RIN
TUNER-GND AUDIO RIN
TUNER-CUBS GND
SCL2 AUDIO LIN
SK3
SDA2 AUDIO LIN
GND GND
SIF CVBS
LED CVBS
CN505
IR
GND YIN
AVI_R CIN
CN921
AVI_L GND
+8V GND
GND GND
COMP_RIN NC
COMP_LIN
GND
NC
CN801
CUBS
+14V
CN182
S_VIDEO_Y GND
GND