SERVICE SAFETY PRECAUTIONS ........................................................................................................................................ 3
HANDLEING THE LCD MODULE ........................................................................................................................................... 5
1. SERVICE MODE .................................................................................................................................................................. 7
1-1. STARTING SERVICE MODE ......................................................................................................................................... 7
6. CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 40
7. PC BOARDS TOP & BOTTOM VIEW................................................................................................................................. 50
• The caution items shown here describe major safety issues and should always be observed.
• The meanings of the various indications are as follows.
WARNING
CAUTION
* Physical damage means major damage to a home, furnishings and other possessions.
Examples of marks
SHOCK HAZARD
PROHIBIT DISASSEM-
BLING
UNPULUG
Indicates a hypothetical situation in which service personnel and nearby third parties, or even
end users due to a product defect after the service operation is completed, could possibly be in
danger of injury or even death in the event of operational error.
Indicates a hypothetical situation in which service personnel and nearby third parties, or even
end users after the service operation is completed, could possibly be in danger of injury, or
where there could be physical damage in the event of operational error.
The" indicates caution (including danger and warning).
"
The actual meaning of this caution is indicated inside the
The example shown to the left indicates the danger of "electrical shock".
The
indicates a forbidden action.
The actual meaning of this caution is indicated inside the
The example shown to the left indicates that disassembly is forbidden.
The
-
indicates a forced action (an action that must be performed).
The actual meaning of this forced action is indicated by
The example shown to the left indicates that the power plug must be disconnected.
or nearby illustrations or text.
or nearby illustrations or text.
-
or nearby illustrations or text.
-
3
-
Page 4
KEEP CHILDREN
AWAY
UNPULUG
SHOCK HAZARD
USE SPECIFIED
PARTS
CAUTION FOR
WIRING
CAUTION FOR
ASSEMBLING /
WIRING
WARNING
• Always advise users to keep children away.
There is danger of injury to children from tools, disassembled products, etc.
• Always disconnect the power plug before starting work whenever power is not required.
Failure to disconnect the power plug before starting work can result in electrical shock.
• Depending on the model, use an insulation transformer or wear gloves when servicing with the
power on, and disconnect the power plug to avoid electrical shock when replacing parts.
In some cases, alternating current is also impressed in the chassis, so electrical shock is possible if the chassis is contacted with the power on.
• Always use the replacement parts specified for the particular model when making repairs.
The parts used in products have the necessary safety characteristics such as inflammability,
voltage resistance, etc.; therefore, use only replacement parts that have these same characteristics.
Use only the specified parts when the
• Parts mounting and routing of the wiring should be the same as that used originally.
For safety purposes, insulating materials such as tubing or tape is sometimes used and printed
circuit boards are sometimes mounted floating.
Also make sure that wiring is routed and clamped to avoid parts that generate heat and which
use high voltage. Always follow the original scheme.
• After a repair has been completed, reassemble all disassembled parts, and route and reconnect the wiring, in accordance with the original scheme.
Do not allow internal wiring to be pinched by cabinets, panels, etc.
Any error in reassembly or wiring can result in electrical leakage, flame, etc., and may be
hazardous.
mark is included in a circuit diagram or parts list.
CHECK INSULATION
RESISTANCE
PROHIBIT
REMODELING
• After completing the work, disconnect the power plug from the outlet, remove the antenna, turn
on the power switch. Then, use a 500V insulation resistance meter to check the insulation
resistance of the antenna terminal, other metallic parts and between the prongs of the power
plug to make sure that the insulation resistance is 1M 1 or more.
The set will require inspection and repair if the insulation resistance is below this value.
• Never remodel the product in any way.
Remodeling can result in improper operation, malfunction, or electrical leakage and flame,
which may be hazardous
-
4
-
Page 5
HANDLING THE LCD MODULE
a
n
r
r
y
n
r
e
h
d
-
Safety Precautions
In the event that the screen is damaged or the liquid crystal
(fluid) leaks, do not breathe in or drink this fluid. Also, never
touch this fluid.
Such actions could cause toxicity or skin irritation. If this fluid
should enter the mouth, rinse the mouth thoroughly with water. If the fluid should contact the skin or clothing, wipe off
with alcohol, etc., and rinse thoroughly with water. If the fluid
should enter the eyes, immediately rinse the eyes thoroughly
with running water.
Precautions for Handling the LCD Module
CAUTION
The LCD module can easily be damaged during disassembly
or reassembly; therefore, always observe the following precautions when handling the module.
1. When attaching the LCD module to the LCD cover, position it appropriately and fasten at the position where the
display can be viewed most conveniently.
The metal edges of the LCD module
are sharp, handle it with care.
3. If the panel surface becomes soiled, wipe with cotton or
soft cloth. If this does not remove the soiling, breathe o
the surface and then wipe again.
If the panel surface is extremely solied, use a CRT cleane
as a cleaner. Wipe off the panel surface by drop the cleane
on the cloth. Do not drop the cleaner on the panel. Pa
attention not to scratch the panel surface.
4. Leaving water or other fluids on the panel screen for a
extended period of time can result in discoloration o
stripes. Immediately remove any type of fluid from th
screen.
2. Carefully align the holes at all four corners of the LCD
module with the corresponding holes in the LCD cover
and fasten with screws. Do not strongly push on the module because any impact can adversely affect the performance. Also use caution when handling the polarized screen
because it can easily be damaged.
5. Glass is used in the panel, so do not drop or strike wit
hard objects. Such actions can damage the panel.
6. CMOS-LSI circuitry is used in the LCD module, so avoi
damage due to static electricity. When handling the mod
ule, use a wrist ground or anchor ground.
-
5
-
Page 6
7. Do not expose the LCD module to direct sunlight or strong
ultraviolet rays for an extended period of time.
8. Do not store the LCD module below the temperature conditions described in the specifications. Failure to do so
could result in freezing of the liquid crystal due to cold air
or loss of resilience or other damage.
9. Do not disassemble the LCD module. Such actions could
result in improper operation.
10. When transporting the LCD module, do not use packing
containing epoxy resin (amine) or silicon resin (alcohol or
oxim). The gas generated by these materials can cause
loss of polarity.
-
6
-
Page 7
1.Service Mode
1-1.Starting Service Mode
*Set LCD TV to the normal TV signal receive mode.
Note: In this "Service Mode" section, [ ] shows a button.
1-1-1. Press [MUTE] on the remote control once.
1-1-2. Presss [MUTE] again, and press [
Service mode displayed on TV screen
Items other than those enclosed by are default
settings.
] on LCD TV.
VCTi version
Scaler version
15-inch TV
ItemDefault setting
3D Comb Filter0
HDTV1
PC Information1
Speaker Outout0
FLI23100
Country2
Canadian Vchip0
BS0
Module Option4
20-inch TV
ItemDefault setting
3D Comb Filter1
HDTV1
PC Information1
Speaker Outout1
FLI23100
Country2
Canadian Vchip0
BS0
Module Option0
- 7 -
Page 8
2. Adjustment
Note: In this "Adjustment" section, [ ] shows a button.
2-1.Adjustment Tools and Conditions
Tools: Pattern Generator (801GF, MSPG925F)
DDC Adjustment Tool
PC
Remote Control
Conditions: Heat Run 30 minutes or more
2-2. Auto Gain/Offset Adjustment
2-2-1. RF Mode Adjustment (normal TV receive mode)
No reguired
2-2-2. Component Mode Adjustment
Preparation
Carry out Heat Run for 30 minutes or more before adjustment
(with no RF signal).
1) Connect Y, Pb, and Pr output signals of Pattern Generator
to the component jack (Y, Pb, Pr) of LCD TV.
2) Connect Y, Pb, and Pr output signals of Pattern Generator
to the component jack (D Jack) of LCD TV.
3) Change the TV input mode to component mode.
4) Select 480p Mode (Y:100% Pb/Pr:75%) in Pattern Generator. Select Pattern 33 (Color Bar Pattern
signal) in Pattern Generator (MSPG925F).
5) Go into service mode, and Auto Gain menu appears, and then press VOL [+].
6) Press [OK] to store the adjustment data.
(Adjustment in component mode or PC mode)
2-2-3. PC Mode Adjustment
Preparation
Carry out Heat Run for 30 minutes or more before adjustment (with no RF signal).
Connect Pattern Generator to the 15-pin D-Sub Jack of LCD TV.
1) Change the TV input mode to PC mode.
2) Set Pattern Generator to the following:
15DL15,15DL75: XGA (1024x768) 16-step or 11-step grayscale
20DL75 : VGA (640x480) 16-step grayscale
3) Go into service mode, and Auto Gain menu appears, and then press VOL [+].
4) Press [OK] to store the adjustment data.
- 8 -
Page 9
4. TROUBLESHOOTING
Process A
No power
Ref.1/1-1
Check 15V or ST_ 5V
of Power B/D
Pass
Fail
Check short circuits of Main B/D
or Change Power B/D
Check Output of
IC1004, IC1005(Main B/D)
Pass
Check IR Assy
Pass
Check P101 Connector
Check IC 1004, IC1005
FailFail
Fail
PIN 7 LEVEL(High 3.3V)
Pass
Change IC1004 , IC1005
or check short circuits of Main B/D
Check 5V, 33V of TU100
Re-soldering or Change
the defect part
Check the input
source
Pass
Check R217 Level
(Video1,RF : HIGH 3.3v)
Pass
Ref.7
Check the Input/Output
of IC200
Pass
Check the Input/Output
of IC500
Pass
Fail
Fail
Fail
Pass
Fail
Check short circuits of Main B/D
& JACK B/D
Check short circuits of Main B/D
& JACK B/D
Ref.6
Check the Input/Output
of IC300
Check short circuits of Main B/D
or Change IC500
Option
Fail
Only for 20DL75
Check short circuits of main
B/D or Change the defect part
Check cable
and Jack
Ref.6
Y separated Output :
IC300 (Comb Filter), #96
- 36 -
Ref.7
ITU656 Clock Out :
IC200(VCTI), #83
Page 13
No Raster on video Signall
(Video2 , S-video)
Repeat Process A
Pass
Check the input
source
Pass
Check R212 of Main B/D
1.Video2 : HIGH
2.s-video : LOW
Pass
Ref.8
Check the Input/Output
of IC200
Pass
Check the input/output
of IC500
Pass
Check short circuits of Main B/D
Fail
Fail
FailFail
Pass
Fail
& side B/D
Check short circuits of Main B/D
& JACK B/D
Ref.9
Check the Input/Output
of IC300
Check short circuits of Main B/D
or Change IC500
Only for 20DL75
Check short circuits of Main
B/D or Change the defect part
Check cable
and Jack
Ref.8
ITU656 Clock Out :
IC200(VCTI), #83
- 37 -
Ref.9
Y separated Output :
IC300 (Comb Filter), #96
Page 14
No Sound
(ALL MODE)
No Sound
(Only VIDEO 1 or PC mode)
Check the input
source
Pass
Check the input/output
of IC200 of Main B/D
Pass
Ref.10
Check the input/output
of IC600 of Main B/D
Pass
Check the speaker
Fail
Fail
Fail
Fail
Change source
Input
Pass
Re-soldering or
Change IC200
Re-soldering or
Change IC600
Change
speaker
Check the R750 Level
Video1 : High
PC : Low
Pass
Check Input / Ouput
& 12V Of IC 702
Chang IC 702
Fail
Check short
circuits of Main B/D
Fail
Check the speaker wire
Ref.10
Sound Input :
IC600 (Audio AMP), #3, 5
Pass
- 38 -
Page 15
5. EXPLODED VIEWS
15DL15,15DL75,20DL75
030
110
100
050
160
170
020
130
090
080
070
040
150
140
010
- 39 -
Page 16
6. CHASSIS AND CABINET REPLACEMENT PARTS LIST
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “SERVICE SAFETY PRECAUTIONS” ON PAGE 3 OF
THIS MANUAL.
CAUTION: The international hazard symbols "" in the schematic diagram and the parts list designate components
which have special characteristics important for safety and should be replaced only with types identical to those in
the original circuit or specified in the parts list. The mounting position of replacements is to be identical with originals.
Before replacing any of these components, read carefully the SERVICE SAFETY PRECAUTIONS. Do not degrade
the safety of the receiver through improper servicing.
NOTICE:
•
The part number must be used when ordering parts, in order to assist in processing, be sure to include the
Model number and Description.
•
The PC board assembly with ∗ mark is no longer available after the end of the production.
* The information contained in this section subjects to model.
MAIN BOARD BOTTOM (FOIL) SIDE
-
50
-
7. PC BOARDS TOP & BOTTOM VIEW
Page 27
MAIN BOARD
TOP (COMPONENT) SIDE
-
51
-
Page 28
JACK
TOP (COMPONENT) SIDE
CONTROL BOARD
TOP (COMPONENT) SIDE
TOP (COMPONENT) SIDE
SIDE BOARD (20DL75)
-
52
-
BOTTOM (FOIL) SIDE
CONTROL BOARD
JACK
BOTTOM (FOIL) SIDE
BOTTOM (FOIL) SIDE
SIDE BOARD (20DL75)
Page 29
TOP (COMPONENT) SIDE
SIDE BOARD (15DL75)
IR BOARD
TOP (COMPONENT) SIDE
BOTTOM (FOIL) SIDE
TOP (COMPONENT) SIDE
HEADPHONE BOARD (15DL75)
TOP (COMPONENT) SIDE
HEADPHONE BOARD (20DL75)
HEADPHONE BOARD (15DL75)
-
53
-
BOTTOM (FOIL) SIDE
SIDE BOARD (15DL75)
IR BOARD
BOTTOM (FOIL) SIDE
BOTTOM (FOIL) SIDE
HEADPHONE BOARD (20DL75)
Page 30
8. SCHEMATIC DIAGRAM
MODEL : 15DL15 / 15DL75 / 20DL75
WARNING : BEFORE SERVICING THIS CHASSIS, READ THE "SERVICE SAFETY PRECAUTIONS" ON PAGE 3 OF
THIS MANUAL.
CAUTION : The international hazard symbols " " in the schematic diagram and the parts list designate components which
have special characteristics important for safety and should be replaced only with types identical to those in the original
circuit or specified in the parts list. The mounting position of replacements is to be identical with originals. Before replacing
any of these components, read carefully the SERVICE SAFETY PRECAUTIONS on the MANUAL for this model. Do not
degrade the safety of the receiver through improper servicing.
NOTE:
1. RESISTORResistance is shown in ohm [K = 1.000, M = 1.000.000]. All resistors are 1/6W and 5%
tolerance carbon resistor, unless otherwise noted as the following marks.
1/2R = Metal or Metal oxide of 1/2 watt1/2S = Carbon compsistion of 1/2 watt
1RF = Fuse resistor of 1 watt10W = Cement of 10 watt
K = ±10% G = ±2% F = ± 1%
2. CAPACITOR Unless otherwise noted in schematic, all capacitor values less than 1 are expressed in
?F, and the values more than 1 in pF.
All capacitors are ceramic 50V, unless otherwise noted as the following marks.
Electolytic capacitorMylar capacitor
3. The parts indicated with " * " have special characteristics, and should be replaced with identical parts only.
4. Voltages read with DIGITAL MULTI-METER from point indicated to chassing ground, using a color bar signal with all
controls at normal, line voltage 220 volts.
5. Waveforms are taken receiving color bar signal with enough sensitivity.
6. Voltage reading shown are nominal values and may vary ±20% except H.V.
* The information contained in this section subjects to model.
3D COMB ............................................................................................................................................................ 2/17
COMPONENT JACK ......................................................................................................................................... 11/17
SCART JACK .................................................................................................................................................... 14/17
LED & IR ........................................................................................................................................................... 15/17
SIDE AV (20DL75) ............................................................................................................................................ 16/17
SIDE AV (15DL15/15DL75) .............................................................................................................................. 17/17
-
54
-
Page 31
8-1. WIRING DIAGRAM
5
4
CONTROL BOARD
2
MAIN BOARD
1
6
3
7
10
10
9
AC POWER BOARD
INVERTER BOARD
8
-
55
-
Page 32
8-2. BLOCK DIAGRAM (20DL75)
V
A
_
E
D
I
S
Y / C
V
e
P
E
S
A
Ear
L
R
From AMP
phon
PC AUDIO
KER
PC
J2 1
PC AUDIO
VIDEO 2 L,R
TTL OUT
IC550
IC550
(FLASH)
AT49F002F
AT49F002 F
IC600
IC600
TPA3008D2
(Audio Amp)
TPA3008D2
(Audio Amp)
(FLASH)
IC500
IC500
GM2221
(SCALER)
GM2221
(SCALER)
PC RGB
To Ear Phone
BA7657F
IC701
Component(Y,Pb, Pr)
POWER
VIDEO2_V, Y/C
656 F ORMAT
VCT49xy F
VCT49xyF
CVBS
IC200
IC200
TC90A65 F
TC90A65F
IF DECODER
IF DECO DER
IC300
IC300
(3D COMB FILTER)
Y / C
`
`
VIDEO DECODER
VIDEO DEC ODER
SOUND PROCESSOR
(USA Only)
(USA Only)
(3D CO MB FILTER)
MICOM
MICO M
SOUND PROCESSOR
,-
IF+
S
A
S
W
A
W
IC702
LA722 2
IC201
IC201
AT24C16
AT24C16
(EEPROM)
(EEPROM)
Tuner
TU100
Tuner
TU10014066
Z100
14066
PC RGB
PC AUDIO
VIDEO 1 _L,R
IC2000
IC2000
VIDEO 1 _V
r
P
J20
J2 0
D-SUB
D-S U B
FOR SEVIC E(ISP)
VIDEO 1 _V
1. 15V
2. 15V
3. GND
4. GND
5. 5V
6. 5V
7. GND
8. 33V
9. CTL
10. EXT
11. B R
b
Compone nt(Y,Pb,Pr)
AUDIO_OUT
POWER B/ D
-
56
-
YP
AC IN
COMPONENT
AUDIO_OUT
Page 33
8-3. BLOCK DIAGRAM (15DL15,15DL75)
V
A
_
E
D
I
S
Y / C
L
V
R
LVDS
IC500
IC500
GM2221
(SCALER)
GM2221
(SCALER)
IC550
IC550
AT49F002 N
TPA3008D 2
TPA3008D2
AT49F002 N
IC600
IC600
(FLASH)
(FLASH)
(Audio Amp)
(Audio Amp)
To Ear Phone
IC701
BA7657F
PC RGB
Component(Y,Pb, Pr)
POWER
VIDEO 2 L,R
VIDEO2_V, Y/C
656 F ORMAT
VCT49xyF
VCT49xyF
CVBS
IC200
IC200
IF DECODER
IF DECO DER
TC90A65F
TC90A65F
`
`
VIDEO DECODER
From AMP
MB FILTER)
IC300
IC300
(3D COMB FILTER)
(3D CO
Y / C
VIDEO DEC ODER
SOUND PROCESSOR
SOUND PROCESSOR
MICOM
MICO M
Ear
e
phon
S
AT24C16
AT24C16
,-
IF+
A
S
A
IC702
LA7222
IC201
IC201
(EEPROM)
W
(EEPROM)
W
PC AUDIO
Tuner
TU100
Tuner
TU10014066
Z100
14066
PC RGB
PC AUDIO
VIDEO 1 _L,R
P
S
IC2000
IC2000
E
A
KER
PC
J2 1
PC AUDIO
J20
J2 0
D-SUB
D-S U B
FOR SEVIC E(IS P)
VIDEO 1 _V
VIDEO 1 _V
1. 15V
2. 15V
3. GND
4. GND
5. 5V
6. 5V
7. GND
8. 33V
9. CTL
10. EXT
11. B R
r
P
b
Compone nt(Y,Pb,Pr)
AUDIO_OUT
POWER B/ D
-
57
-
YP
AC IN
COMPONENT
AUDIO_OUT
Page 34
1. Video Controller Unit & Display Data Conversion Unit
The video controller unit receives the video signals inputted through the tuner, AV port (VIDEO1, VIDEO2), and
converts them into an ITU656 signal through the microcomputer (VCTI) combined with the video decoder that
integrates various functions in one chip.
Either component YPbPr signal or PC RGB signal is selected by the switching IC and inputted to a scaler
(GM2221), which is sent to the LCD module after being modified to an LVDS signal through the integrated LVDS
IC.( only 15 inch Module)
Or, it is sent to the LCD module as a TTL output. (only 20 inch Module)
VCTi is the main microprocessor that handles video signal processing and sound signal processing. It also
manages the RF signals received from the tuner.
The scaler can control timing to fit into the LCD panel, and can also control the size and position of the input
signal.
2. Power Supply Unit
The power supply unit provides 15V and 5V DC power to the mainboard.
The PWM Step- Up DC/ DC Converter circuit is used to generate the 33V used for the tuner.
15V power is directly used by the sound amplifier IC and is also used to generate 5V and 3.3V power through the
Step- Down DC/ DC Converter. 5V power is converted to 3.3V and 1.8V power through the regulator, which in
turn supplies electrical power for ICs such as VCTI and scaler.
* The information contained in this section subjects to model.
-
58
-
Page 35
* The information contained in this section subjects to model.
(1/17)
15DL15,15DL75,20DL75
SCALER
-
59
-
Page 36
(2/17)
15DL15,15DL75,20DL75
3D COMB
-
60
-
Page 37
(3/17)
15DL15,15DL75,20DL75
POWER
-
61
-
Page 38
(4/17)
15DL15,15DL75,20DL75
AMP
-
62
-
Page 39
(5/17)
15DL15,15DL75,20DL75
INPUT
-
63
-
Page 40
(6/17)
15DL15,15DL75,20DL75
S/W & ROM
-
64
-
Page 41
(7/17)
15DL15,15DL75,20DL75
INTERFACE
-
65
-
Page 42
(8/17)
15DL15,15DL75,20DL75
TUNER
-
66
-
Page 43
(9/17)
15DL15,15DL75,20DL75
VCTI
-
67
-
Page 44
(10/17)
15DL15,15DL75,20DL75
D-JACK
-
68
-
Page 45
(11/17)
15DL15,15DL75,20DL75
COMPONENT JACK
-
69
-
Page 46
(12/17)
15DL15,15DL75,20DL75
HEADPHONE
-
70
-
Page 47
(13/17)
15DL15,15DL75,20DL75
CONTROL
-
71
-
Page 48
(14/17)
15DL15,15DL75,20DL75
SCART_JACK
-
72
-
Page 49
(15/17)
15DL15,15DL75,20DL75
LED & IR
-
73
-
Page 50
20DL75
SIDE AV
(16/17)
-
74
-
Page 51
(17/17)
15DL15,15DL75
SIDE AV
-
75
-
Page 52
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