China LT-20AMF LCD Schematic

COLOR TFT-LCD TV
SERVICE MANUAL

MODEL : LT-20AMF

CAUTION !!

BEFORE SERVICING THE TFT-LCD TV,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

LT-20AMF SERVICE MANUAL

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SAFETY PRECAUTIONS

!! Important Safety Notice !!

Many electrical and mechanical parts in this chassis have special safety-related
characteristics.
These parts are identified by in the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components
as recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth
ground (Water Pipe, Conduit, etc.) and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more
sensitivity.
Reverse plug of the AC cord into the AC outlet and repeat AC voltage measurements for each
exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS, which is,
corresponds to 0.5mA.
In case any measurement is out of the limits specified, there is possibility of shock hazard and
the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

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SERVICING PRECAUTIONS

CAUTION!!

Before servicing receivers covered by this service manual, read and follow the SAFETY
PRECAUTIONS on page 3 of this publication.

General Servicing Precautions

1.Always unplug the receiver AC power cord from AC power source before;

ⓐRemoving or reinstalling any component, circuit board module or any other receiver assembly.
ⓑDisconnecting or reconnecting any receiver electrical plug or other electrical connection.
ⓒ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 harzard.

2.Do not spray chemicals on or near this receiver or any of its assemblies.

3.Do not defect any plug/socket voltage interlocks with which receivers covered by this service
manual might be equipped.

4.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.

5.Do not connect the test fixture ground strap to power supply heatsink 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) Device.Examples

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 th separate from or “lift-off” the board.
The following guidelines and procedures should be flollowed 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 coopper pattern.

3.Bend a small “U” in one end of a small guage jumper wire and carefully crimp it around the IC
pin.

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.

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CONTENTS

Safety precautions ----------------------------------------------------------- 2

Servicing precautions ------------------------------------------------------- 3

Contents ------------------------------------------------------------------------- 4

Specifications ----------------------------------------------------------------- 5

Location of control ---------------------------------------------------------- 8

External in / output ---------------------------------------------------------- 11

Disassembly procedure ---------------------------------------------------- 12

Mechanical exploded view ----------------------------------------------- 20

Circuit descriptions --------------------------------------------------------- 21

Trouble shooting ------------------------------------------------------------- 35

Adjustment instruction with SVC mode ------------------------------ 38

Inspection instruction ------------------------------------------------------ 39

PCB Layout --------------------------------------------------------------------- 40

Part appearance -------------------------------------------------------------- 45

Packing instruction ---------------------------------------------------------- 47

Replacement Parts List ---------------------------------------------------- 48

Block diagram ---------------------------------------------------------------- 54

Connection diagram -------------------------------------------------------- 55

Schemetic diagram --------------------------------------------------------- 56

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SPECIFICATIONS

Note: Specifications and others are subject to change without notice for improvement.

1.Scope.

This document is the specification of 20.1” TFT-LCD Color TV.

2.Power

1) Power requirement
DC 15V / 4.5A

2)AC / DC Adapter.

Input Frequency : 50/60㎐ ±3㎐
Input Voltage : AC 100V ～ AC 230V (±10%)

Output Voltage : DC 15V

3)Power cord
Use UL listed and CSA certified detachable power cord type ;SVT, 3-conductors, 18AWG
For AC 120V area. Use VDE listed detachable power cord type ;HO5VV-F, 3-conductors,

18AWG for AC 220～240V area.

3.Tuning system

FVS 100

4.Sound output

3W+3Wrms Stereo (Max)

5.Antenna input impedance

VHF / UHF at 75ohm

6.OSD Type (On Screen Display)

Windows type (Center)

7.External in/output

DC Power in, PC/DTV in, COMPONENT, Head Phone out, S-Video in, A/V input,A/V output,
ANT in.

Audio In : 0.4Vrms, over 10KΩ
Video In : 1Vp-p, over 75Ω
PC/DTV In: 0.7Vp, over 75Ω

8.Function

CATV/Hyper band
Auto Program
Manual Program
Auto Sleep
Quick view
PSM(Picture Status memory)
SSM(Sound Status memory)

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9.Receiving RF TV system

NO

Model System
1 PAL-B
2 PAL-G
3 PAL-I, I /I
4 PAL-D
5 PAL-K
6 SECAM-B
7 SECAM-G
8 SECAM-D
9 SECAM-K

10 SECAM-K1
11 SECAM-I (6.0)
12 NTSC-3.58 / 4.5
13 NTSC-3.58 / 5.5
14 NTSC-3.58 / 6.0
15 NTSC-3.58 / 6.5
16 NTSC-3.58 / 4.5(5.0)
17 NTSC-4.43 / 5.5
18 NTSC-4.43 / 6.0
19 NTSC-4.43 / 6.5
20 PAL 5.5 / 60Hz
21 PAL 6.0 / 60Hz
22 PAL 6.5 / 60Hz
23 SECAM 5.5 / 60Hz
24 SECAM 6.0 / 60Hz
25 SECAM 6.5 / 60Hz
26 SECAM L / L'

TOTAL SYSTEM 8

SPECIFICATIONS

LT-20AMF / /

X//
X//
X//
X//
X//
X//
X//
X//
X//
X//

X//
O//
O//
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O//
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O//
O//
O//

X//

X//

X//

X//

X//

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//

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SPECIFICATIONS

10. PC Mode Scan Frequency & Timing

1)Scan Freq : H: 31 ～ 56 kHz / V : 56 ～ 75㎐

2)Preset Timing Chart

Mode Resolution H-Freq(Khz) V-Freq(Khz)

640x480

VGA

SVGA

DTV

640x480
640x480
720x400
800x600
800x600
800x600
800x600

1080i

720p
576p
480p

Note!! :

ⓐ If the set is cold, there may be a small “flicker” when the set is switched on. This is

Normal, there is nothing wrong with the set.

ⓑ if possible, use the VESA 640x480 PC video mode to obtain the best image quality for

your LCD TV. If used under the other resolutions, some scaled or processed pictures may
appear on the screen.

ⓒ some dot defects may appear on the screen, like Red, Green or Blue spot. However, this

will have no impact or effect on the monitor performance.

11. TFT – LCD Panel Character

1) Feature

Size :20.1" Diagonal
LCD Type :Color Active Matrix TFT
Pixel Pitch :0.2125mm(H) x 0.6375mm(V)
Pixel Format :640x480 Pixels, RGB Stripe
Active Video Area :408mm(H) x 306mm(V)
Surface treatment :Anti-reflective + Anti-glare coating.
Response Time(Typ) :16mS(Typ)
Viewing Angle<CR≥10> : Hor [Left/Right] Æ 80Deg (Typ) / 80Deg (Typ),

Ver [High(Top)/Low(Bottom)] Æ 70Deg (Typ) / 70Deg (Typ)

Luminance(Typ) : 450 cd/㎡(Typ)

Contrast Ratio(Typ) : 500:1 (Typ)
Display Color : 16,7M Color
Back Light : 6 CCFL

31KHZ

37.9KHz

37.5KHz

31.5KHz

35.1KHz

37.9KHz

48.1KHz

46.9KHz

60Hz
72Hz
75Hz
70Hz
56Hz
60Hz
72Hz

75Hz
50/60Hz
50/60Hz

50Hz

60Hz

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LOCATION OF CONTROL

A

All the function can be controlled with the remote controller.
Some functions can also adjusted with the buttons on the controls on the TV front panel.

12-1. Remote controller
Note !! : Before you use the remote controller, please install the batteries.

1.POWER:

Turns the TV on from standby or off to
standby mode.

2.MUTE:

Turns the sound on and off

3.NUMBER buttons:

Select channel numbers.

4.PSM (Picture Status Memory):

Recalls your preferred picture setting.

5.SSM (Sound Status Memory):

Recalls your preferred sound setting.

6.MENU:

Displays a main menu.

7. ST / SAP:

Selects the MTS-Stereo, Mono and
SAP

8.Q.VIEW:

Returns to the previously viewed
Programme.

9.TV / AV: Selects TV, COMPONENT,

VIDEO, S-VIDEO, RADIO(Only when
the set is Radio On.) or PC mode.
/ Clears the menu from the screen.

10.CH ▲▼ ( Channel Up/Down):

Selects next channel or a menu item.

11.OK:

ccepts your selection or displays the

current mode.

12.VOL ◀▶ ( Volume Up/Down):

Adjusts the sound level or a menu
Setting.

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LOCATION OF CONTROL

12-2. Remote controller
Note !! : Before you use the remote controller, please install the batteries.

13.CC

Sets the caption function.

14.MEMORY

Stores or removes the current
channel.

15.SLEEP

Sets the sleep timer.

16.PC/*

Selects PC mode directly.

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13. Controller of Panel
1 2 3 4 5 6 7

1. MENU

Display a menu.

2.

+ CH - (Channel Up/Down)

Selects a channel or a menu item

3. POWER INDICATOR

Illuminates red when the TV is in­power standby mode.
Illuminates green when the TV is­switched power on mode.
Illuminates amber when the PC mode is switched
power saving mode.

4. ON/OFF

Switches TV set on or off.

5. REMOTE CONTROL SENSOR

Accepts the IR signal of remote
controller.

+ VOL -( Volume Up/Down)

6.

Adjusts the volume.
Adjusts menu settings.

7. TV/AV

Selects input signal source.

Clears the menu from the screen.

LOCATION OF CONTROL

< FRONT VIEW >

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10

EXTERNAL IN / OUTPUT

14. EXTERNAL IN / OUTPUT

22 7

1) DC 15V IN

2) PC/DTV INPUT

3) COMPONENT IN

4) H/P(Headphone out)

Connect a headphone to this socket.

5) S-VIDEO IN

Connect the output of an S-VIDEO VCR to the S-VIDEO input.
Connect the audio outputs of an S-VIDEO VCR to the AV-IN audio inputs.

6) AV-IN

Connect the Audio/Video outputs of external equipment to these inputs.

7) AV-OUT

Connect the Audio outputs(L, R) of the set to Audio-IN(L, R) of another displayer or
the amplifier and the Video output of the set to Video IN of another displayer.

8) Ant. (Antenna input)

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DISASSEMBLY PROCEDURE

15. Deassembly procedure

1).Removal of Stand

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DISASSEMBLY PROCEDURE

2).Removal of Backcover

3).Removal of metal plate

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DISASSEMBLY PROCEDURE

4).Removal of metal chassis

5).Removal of Main PCB

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DISASSEMBLY PROCEDURE

6). Removal of connectors on Main PCB

7). Removal of inverter PCB

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DISASSEMBLY PROCEDURE

8). Removal of LCD Panel chassis

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16.Exploded View󰼿

MECHANICAL EXPLODED VIEW

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CIRCUIT DESCRIPTIONS

17. CIRCUIT DESCRIPTIONS

General Description for 20.1” color TFT LCD TV.

The TFT LCD TV described in the followings is based on a Multi TV system, digital
control display, 20.1” diagonal. The TFT LCD TV is intended to be a finished product,
basically a display device mounted inside an enclosure which will provide the safety
requirements. With the exception of LCD Panel, the display device shall be composed
entirely of solid state components.
These components shall have a history of reliable service in identity applications
and shall be applied in the circuits.

1).SCALER SECTION.

2).VCT 49xy SECTION.

1) SCALER SECTION.

Device : MVRL
Features : Advanced Image Scaling

Automatic Image Optimization
Digital Video processing
Non-linear scaling
On-screen display
8-bit display outputs

1) Description

Designed for both LVDS and Smart Panel with RSDS applications, MVRL is a highly
integrated solution that combines a high performance ADC with an advanced image
processing controller and timing control circuitry. Using advanced image scaling
algorithms, MVRL has intelligently adaptive sub-algorithms that will automatically optimize
the display quality for different images the text is sharper and the graphics is smoother.
The built-in analog interface includes a 110Mhz 8bit 3-channel ADC, VGA, and PLL,
allowing seamless support to resolutions from VGA to SXGA. MVRL includes timing
control circuit for handling gate and source driver ICs for SVGA/SXGA TET-LCD panel
directly.

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2) Block Diagram.

CIRCUIT DESCRIPTIONS

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3)󰼿Pin configuration.

CIRCUIT DESCRIPTIONS

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4-1)󰼿Pin Functions.

CIRCUIT DESCRIPTIONS

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4-2)󰼿Pin Functions.

CIRCUIT DESCRIPTIONS

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4-3)󰼿Pin Functions.

CIRCUIT DESCRIPTIONS

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4-4)󰼿Pin Functions.

CIRCUIT DESCRIPTIONS

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CIRCUIT DESCRIPTIONS

2) MCU SECTION.

Device : VCT 49xy
Features : Built-in teletext decoder.

8051 compatible.
Internal ROM type.

1) Description
The VCT 49xyI, VCT 48xyI is an IC family of high-qualitysingle-chip TV processors. Modular
design and deep-submicron technology allow the economic integration of features in all
classes of single-scan TVsets.
The VCT 49xyI, VCT 48xyI family is based on functional blocks contained and approved in
existing products like DRX 396xA, MSP 34x5G, VSP 94x7B, DDP 3315C, and SDA 55xx.

2) Blockl Diagram

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3)󰼿Pin configuration.

CIRCUIT DESCRIPTIONS

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4-1) Pin(Port) Functions

CIRCUIT DESCRIPTIONS

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4-2) Pin(Port) Functions

CIRCUIT DESCRIPTIONS

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4-3) Pin(Port) Functions

CIRCUIT DESCRIPTIONS

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4-4) Pin(Port) Functions

CIRCUIT DESCRIPTIONS

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4-5) Pin(Port) Functions

CIRCUIT DESCRIPTIONS

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18-1.Troble Shooting

TROUBLE SHOOTING

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18-2.Troble Shooting

TROUBLE SHOOTING

󰼿

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18-3.Troble Shooting

TROUBLE SHOOTING

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ADJUSTMENT INSTRUCTION WITH SVC MODE

19-1.SVC mode data Adjustment
NOTE!! When the EEPROM(IC103) has been replaced, the SVC data should be restored as

the function of individual system and specification.

[ Enter and exit SVC mode ]
Note: Into the SVC mode, Initialize with default data.

1) Press 5 Seconds MENU buttons on both TV set and Remote Controller at the same
time to get into SVC mode.

2) Press the PR ▲▼ button several times to find SVC Data.

3) Input the corresponding SVC data referring to Table below with the VOL ◀▶, key.

4) Press TV/AV button to exit SVC mode

19-2. Factory outgoing setting. (into the SVC mode)

Main menu Change value Sub menu Change value

(Panel) 20

(Model) (M)

(TV White Balance) SYSTEM M/N

Option 1

Audio Options AV1 YUV2

(DRX) (Sub-menu) Text WEST_EU

(NVM Edit) (Sub-menu) Top YES

(Reset TV-set) (Sub-menu) VPS/PDC YES

Option 1

Sub-menu

China/Australia No

Data Service Text

ATS Delay Time 60

Audio Options

Sub-menu

Scart Volume 118

Mute if no carrier Yes

High Deviation No

M42

BG/I/DK 21

NICAM 26

FM Radio 10

Surround 0

DUAL No

MONO No

STEREO Yes

GAME No

Warning: Do not change the “( )” item…

LT-20AMF SERVICE MANUAL

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INSPECTION INSTRUCTION

20. Supplied Accessories

Note: Make Sure the following accessories are provided with Product.

LT-20AMF SERVICE MANUAL

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21-1.Main PCB

PCB LAYOUT

󰼿

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21-2. Main PCB

PCB LAYOUT

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21-3. Main PCB

PCB LAYOUT

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21-4. Main PCB

PCB LAYOUT

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21-5. Control PCB

PCB LAYOUT

21-6. Tuner PCB

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22-1.Part appearance

P ART APPEARANCE

󰼿

C3875S

C3198

A1504S

󰼿

2N7000

󰼿

󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿󰼿C102S

󰼿󰼿

Regulator󰼿for󰼿Tuning󰼿Voltage󰼿

LC33V󰼿or󰼿LD33V󰼿(LD1117)

󰼿
󰼿

EEPROM󰼿24C16W󰼿,24C02W󰼿

LT-20AMF SERVICE MANUAL

AP1501

Dual󰼿FET󰼿SI4925󰼿

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42

󰼿

22-2. Parts Appearance

󰼿

P ART APPEARANCE

Voltage󰼿Detector󰼿

KIA7027AF

󰼿

󰼿

Schottky Rectifier B340

Voltage󰼿Detector󰼿

KIA7042AF󰼿

󰼿

Voltage Reg

KIA78L05F

󰼿 󰼿

TTL LOGIC IC 74F08

󰼿

Voltage Reg

KIA78L09F

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43

PACKING INSTRUCTION

23.Packing instruction

NO PART NO DESCRI P T IO N MAT E RKAL COL O R Q'T Y

1 - 20" LCD COLO R T V - - 1

2 321-003A POLY VINLY PE - 1

3 310-012 A,B PACKING L,R EPS WHITE 1

4 300-008M G IF T BO X PAPER - 1

5 300-003J ACCESSORY BOX PAPER - 1

6 499-002A T APE OPP - - 1700mm

2

22

1

11

3

33

4

44

6

66

5

55

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REPLACEMENT PART LIST

24-1.Parts List (Assemble process)

Level P/N DESCRIPTION FUNCTION Qty

1 300-008U 20A/E MODEL,NO BRAND BOX, CARTON 1

1 310-005A 201 LCD COLOR TV PACKING, TOP 1

1 310-006A 201 LCD COLOR TV PACKING, BOTTOM 1

1 320-001A ACCESSORY PACKING BAG, VINYL 1

1 321-003A 201 A/E SET PACKING BAG, PACKING 1

1 400-001K 20A CH, SILVER/GRAY COVER, FRONT 1

1 401-002U 201,IPS/CMO,SILVER COVER, BACK 1

1 404-002A 15/17/20, L/KEY, SIL BLOCK KNOB 1

1 405-003A 20.1", GRAY SIDE MOLD 2

1 407-001N 20.1 CMO,PANEL C/SHD SHIELD, FRONT 1

1 407-002G 20 IPS, A/E TOOL SHIELD, REAR 1

1 407-003N 20.1" A/E,CMO, YUV SHIELD, JACK 1

1 408-001A 15/17/20",A/D FILTER FILTER, LED 1

1 410-001L TTB 3*10 SCREW 16

1 410-001M BTB 3*6 SCREW 4

1 410-001N FTB 3*6 SCREW 19

1 410-001Q BTB 4*12 SCREW 8

1 410-001R PB 4*8 SCREW 4

1 410-002D TTBW 3*6 SCREW 16

1 410-003C PB 3*12 - SZN SCREW 4

1 490-001Z 7ITS-FK 12-4-80-13 FORM, SHIELD 1

1 490-011B 7ITS-FK 19-11-150-13 FORM, SHIELD 1

1 490-011N MK-10-11-30-11 FORM, SHIELD 3

1 491-001A W40mm,L20mm, COPPER TAPE, CONDUCTIVE 2

1 499-001C W:20mm TAPE, OPP 50

1 499-002A W:70mm TAPE, OPP 3000

1 499-004A W:20mm, L:30m TAPE, ACETATE 280

1 500-027N

1 501-001W LATIN,SPANISH,COMMON LABEL, WARNING 1

1 501-0030 SILVER/BLACK LABEL,SERIAL 2

1 501-017L SANYO,15/20,45mm STICKER, LOGO 1

1 501-102B LT-20AMF,ARDWSAF0 LABEL, ID 1

1 509-021A

1 510-011J NO BRAND,CH,ARC REMOCON 1

1 520-001A 1.5V, AAA SIZE BATTERY 2

1 610-003B 7W, 8 OHM SPEAKER 4

1 620-002A 15V, 4.5A H&E AC/DC ADAPTER(WEEE) 1

1 621-001C 125V,3P,KKP-30(USA) POWER CORD 1

1 622-004C 201, FIF2066-35A INVERTER, CMO 1

1 626-002C IVORY,1.8M,15P,SHORT CABLE, PC RGB 1

1 AYCOLT15A01C A/D,15/17/20,VCTI CONTROL PCB ASSY 1

1 AYMALT41C01C 201 VCTI YUV NTSC MAIN PCB ASSY 1

1 AYSTLT20A01A 201 A-MODEL,SIL/GRA STAND ASSY 1

1 CON02P200A0Q 20 SPK,2P,530MM LEAD ASSY 1

1 CON02P350ACB 201, 2P 3EA 65mm LEAD ASSY 1

1 CON03P200A0V 201 SPK, 3P 850MM LEAD ASSY 1

1 CON07P200AAT 201, 7P 640MM LEAD ASSY 1

1 CON10P125AAC 104 INVT,10P 70MM LEAD ASSY, CASIO 1

1 CON50P050AA2 201 CMO,50P 130MM-/- LEAD ASSY 1

1 PANV201V1000 201,CMO,V201V1 PANEL, LCD COLOR 1

LT-20AMF SERVICE MANUAL

20AMF,NOBRAND,중남미

SANYO,15/20 공용

OWNERS MANUAL 1

LABEL, BRAND 2

45

PAGE:

REPLACEMENT PART LIST

24-2.Parts List (Main PCB)

분류

1
1 0ICKE78120AD KIA7812API KIA7812API 1 IC802
1 0JAPK014A00D PMJ014A Jack, A/V+HP+SVHS 1 J402
1 0JAPK6054BBD PJ6054B Jack, AV 3-PIN 1 J405
1 0LRSM00100BD SMC103 Inductor, 1mH 1 L802
1 0XTKI120000D Crystal, 12MHZ 1 X10
1 0XTKI202500D Crystal, 20.25MHz 1 X100
1
1 AYHSLA4282IB GR, HEAT SINK MANUAL 1 IC605
1 WAFLG04250SD GIL-G-4P-S3T2 Pin wafer, 4-PIN 1 P110
1 WAFML07200SD Pin wafer, 7-PIN, STRAIGHT 1 P111
1 WAFYH02200SD SMW200-02 Pin wafer, 2-PIN 1 P601
1 WAFYH03200SD SMW200-03 Pin wafer, 3-PIN 1 P602
1 WAFYH10200SD WAFER, PIN 10-PIN, P2.0mm STRAIGHT 1 P114

분류

1 0JADM15RF00D DAH-15RF-4B4 Jack, D-SUB 1 J410

P/N PART NAME DESCRIPTION Q,TY CIRCUIT NO

0ICKE78080AD KIA7808AP IC, KIA7808

1JADM231000D DS231-115 Jack, DC-Power

GRLT41CM001E GR, PC MANUAL

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

1IC800

1J801

GRLT41CM001J GR, TUNER' MANUAL NTSC

분류

1 111-A46A PCB 20FLF Tuner PCB 1
1 0TULGH017FBD TAEW-H017F Tuner 1
1 1SFEPX6965MD X6965M SAW FILTER 1 IC190
1 WAFYH10200AD BMH200-10R Pin wafer, 10-Pin 1 P102

분류

1 0JAPK6063C0D PJ6063 Jack, YUV 1 J401
1 0JAPK6035J2D PJ6035J2 Jack, YUV SOUND 1 J404

분류

2 0CESS010HMTR 0CE105CK638 Capacitor, AL.E 1UF 2 C902,C903

2 0CESS100CMTR CESSL1C100M0511AD Capacitor, AL.E 10UF 16V 17

2 0CESS101CMTR CESSL1C101M0611AD Capacitor, AL.E 100UF 16V 4 C601,C547,C607,C603,
2 0CESS101EMTR
2 0CESS221CMTR CESSL1C221M0611AD Capacitor, AL.E 220UF 16V 4 C151,C827,C852,C190
2 0CESS221EMTR CESSL1E221M0611AD Capacitor, AL.E 220UF 25V 1 C800
2 0CESS2R2HMTR CESSL1H2R2M0511AA Capacitor, AL.E 2.2UF 50V 4 C179,C606,C222,C602
2 0CESS3R3HMTR CESSL1H3R3M0511AD Capacitor, AL.E 3.3UF 50V 2 C121,C200

2 0CESS470CMTR CESSL1C470M0511AD Capacitor, AL.E 47UF 16V 14

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

GRLT41CM001G GR, DTV MANUAL

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

GRLT41CA001A GR, COMMON AUTO

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

C141,C144,C150,C165,C169,
C171,C172,C818,C820,C822,
C824,C85,C88,C140,C170,
C175,C853,

CESSL1E101M0611AD

Capacitor, AL.E 100UF 25V 3 C816,C850,C804

C101,C104,C130,C412,C413,
C414,C419,C808,C809,C811,
C614,C812,C856,C840,

LT-20AMF SERVICE MANUAL

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46

REPLACEMENT PART LIST

24-3.Parts List (Main PCB)

2 0CESS471CMTR Capacitor, AL.E 470UF 16V 1 C851,
2 0CESS471EMTR 0CE477CH618 Capacitor, AL.E 470UF 25V 3 C610,C612,C613,
2 0CESS4R7HMTR CESSL1H4R7M0511AD Capacitor, AL.E 4.7UF 50V 2 C106,C807
2 0CQSS103KKTR Capacitor, MYLER 2 C604,C605;
2 0LASS220HKTA AL04 TB 220K Inductor, axial 22uH 4 L150,L198,L199,L410

0LBSS3580RTR BFD-3580R2F Bead, Radial 1UH

2
2 0RDSS121HJTA DR1/2WJ121 Resistor, RD 120 ohm 2 R224,R225;
2 1DDSKEU1Z0TA EU1Z (MAKER: SANKEN) Diode, axial EU1Z 1 D801
2 1DZSSHZT33TA DIODE, ZENER AXIAL 33V 1 ZD802;
2 1ICFC2N700TR 2N7000TA IC, 2N7000 2 Q120,Q121;

GRLT41CA001E GR, PC AUTO

분류

2 0CESS470CMTR CESSL1C470M0511AD Capacitor, AL.E 47UF 16V 3 C403,C405,C411,

분류

2 0CESS470CMTR CESSL1C470M0511AD Capacitor, AL.E 47UF 16V 1 C330
2 0CESS010HMTR 0CE105CK638 Capacitor, AL.E 1UF 2 C215,C216

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

GRLT41CA001G GR, DTV AUTO

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

1L807

GRLT41CS001A GR, COMMON SMD

분류

3 0CHSS080DCTS 8P Capacitor, chip 8PF 1 C220;
3 0CHSS100DJTS CL10C100DBNC Capacitor, chip 10PF 1 C703;
3 0CHSS101DJTS CL10C101JBNC Capacitor, chip 100PF 4 C155,C156,C906,C907

3 0CHSS102DKTS CL10B102KBNC Capacitor, chip 1000PF 9

3 0CHSS103DKTS CL10B103KBNC Capacitor, chip 0.01UF 17

3 0CHSS104DZTS CL10F104ZANC Capacitor, chip 0.1UF 55

3 0CHSS105DZTS CL10F105ZPNC Capacitor, chip 1UF 1 C409;
3 0CHSS151DJTS CL10C151JBNC Capacitor, chip 150PF 1 C40;
3 0CHSS152DKTS CL10B152KBNC Capacitor, chip 1500PF 1 C176
3 0CHSS220DJTS CL10C220JBNC Capacitor, Chip, 22PF 2 C23,C24,
3 0CHSS330DJTS CL10C330JBNC Capacitor, chip 33PF 2 C145,C146,
3 0CHSS331DJTS CL10C331JBNC Capacitor, chip 330PF 2 C153,C154;

3 0CHSS334DZTS Capacitor, chip 0.33UF 6

3 0CHSS393DKTS CL10B393KANC Capacitor, chip 0.039UF 1 C41

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

C20,C112,C113,C114,C115,
C901,C163,C904,C905,

C27,C28,C31,C32,C34,
C35,C37,C38,C192,C410,
C192,C193,C416,C417,C418,
C217,C218,

C80,C81,C82,C83,C84,
C86,C87,C608,C609,C611,
C815,C841,C842,C10,C11,
C12,C13,C14,C15,C16,
C17,C18,C19,C21,C22,
C25,C29,C33,C39,C42,
C107,C111,C120,C123,C124,
C125,C127,C128,C133,C134,
C142,C143,C166,C180,C801,
C810,C819,C821,C823,C825,
C191,C189,C805,C806,C813

C116,C117,C118,C119,C131,
C132,

LT-20AMF SERVICE MANUAL

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47

REPLACEMENT PART LIST

24-4.Parts List (Main PCB)

C108,C109,C110,C122,C149,

3 0CHSS471DJTS CL10C471JBNC Capacitor, chip 470PF 16

3 0CHSS472DKTS CL10B472KBNC Capacitor, chip 4700PF 3 C26,C30,C36,
3 0CHSS560DJTS CL10C560JBNC Capacitor, chip 56PF 1 C223
3 0DHKEKDS181S KDS181, DIODE Diode, chip KDS181 2 D601,D602
3 0DHKEKDS226S KDS226, DIODE Diode, chip KDS226 1 D110;
3 0DSSCB340ATS B340A DIODE, SCHOTTKY CHIP 1 D850
3 0ICKE7027FTS KIA7027AF IC, KA7027 1 IC104
3 0ICKE78L5FTS 78L05 IC, KIA78L05F 1 IC838
3 0ICVI4925DTS IC, MOSFET CHIP DUAL P-CHANNEL 30V MOSFET 2 IC820,IC821
3 0LBSS101DJTS CIM21U101 Bead, chip 100 ohm 2012 5 L207,L208,L209,L212,L213

0LBSS121EJTS CIM21J121NE Bead, chip 120 ohm 2012 3 L406,L407,L408

3 0LBSS601FJTS CIM31J601 Bead, chip 600 ohm 3216 15

3 0LHSS100EKTS Inductor, Chip 10UH, 2012 3 L165,L164,L180
3 0LHSS120EJTS
3 0LRSL10100BS SMD12128.5 Inductor, SMD, 33UH 1 L850,

3 0RHSS000DJTS RC1608J000CS Resistor, chip 0 ohm 12

3 0RHSS000EJTS RC2012J000CS Resistor, chip 0 OHM 9

3 0RHSS100DJTS RC1608J100CS Resistor, chip 10 ohm 1 R712,

3 0RHSS101DJTS RC1608J101CS Resistor, chip 100 ohm 36

3 0RHSS102DJTS RC1608J102CS Resistor, chip 1K 10

3 0RHSS103DJTS RC1608J103CS Resistor, chip 10K 5 R20,R530,R616,R802,R190
3 0RHSS104DJTS RC1608J104CS Resistor, chip 100K 1 R808;
3 0RHSS105DJTS RC1608J105CS Resistor, chip 1M 1 R26;
3 0RHSS122DJTS RC1608J122CS Resistor, chip 1.2K 1 R809,
3 0RHSS152DJTS RC1608J152CS Resistor, chip 1.5K 1 R70

3 0RHSS151DJTS RC1608J151CS Resistor, chip 150 ohm 13

3 0RHSS182DJTS RC1608J182CS Resistor, chip 1.8K 1 R531
3 0RHSS202DJTS RC1608J202CS Resistor, chip 2K 1 R408;

3 0RHSS220DJTS RC1608J220CS Resistor, chip 22 ohm 16

3 0RHSS223DJTS RC1608J223CS Resistor, chip 22K 2 R137,R156;
3 0RHSS271DJTS RC1608J271CS Resistor,chip 270 3 R103,R104,R116;
3 0RHSS272DJTS RC1608J272CS Resistor, chip 2.7K 1 R112;
3 0RHSS273DJTS RC1608J273CS Resistor, chip 27K 1 R529
3 0RHSS331DJTS RC1608J331CS Resistor, chip 330 ohm 1 R227

CIL10Y120KNC Inductor, Chip 12UH, 2012

C205,C162,C205,C206,C209,
C210,C225,C226,C402,C908,
C909

L80,L81,L601,L100,L101,
L102,L167,L168,L171,L175,
L803,L804,L805,L806,L809,

3 L211,L901,L902

C224,R14,R118,R127,R128,
R402,R407,R526,R805,R199,
R86,R87

R601,R602,R603,R839,R841,
R851,R842,R852,L210

R120,R129,R130,R131,R132,
R133,R135,R138,R139,R140,
R141,R142,R143,R145,R146,
R147,R148,R149,R150,R151,
R153,R159,R160,R179,R180,
R401,R409,R845,R825,R826,
R827,R828,R829,R400,R405,
R406

R15,R18,R19,R117,R609,
R615,R803,R847,R906,R907;,

R23,R24,R27,R29,R31,
R51,R100,R101,R102,R113,
R114,R115,R613,

R25,R80,R81,R82,R85,
R89,R90,R91,R111,R547,
R548,R549,R550,R701,R702,
R800

LT-20AMF SERVICE MANUAL

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48

REPLACEMENT PART LIST

24-5.Parts List (Main PCB)

3 1ICPH74F08TS N74F08D IC, 74F08 1 IC702
3 1ICST24C02WS 24C02W IC, 24C02 1 IC701

GRLT41CS001G GR, DTV SMD

분류

3 0CHSS030DCTS CL10C030CBNC Capacitor, chip 3PF 1 C326
3 0CHSS102DKTS CL10B102KBNC Capacitor, chip 1000PF 1 C322

3 0CHSS104DZTS CL10F104ZANC Capacitor, chip 0.1UF 20

3 0CHSS473DKTS CL10B473KANC Capacitor, chip 0.047UF 3 C311,C318,C320,
3 0LBSS260DJTS CIB21P260NE Bead, chip 26 ohm 2012 1 L300
3 0LBSS601FJTS CIM31J601 Bead, chip 600 ohm 3216 2 L301,L302,

3 0RHSS000DJTS RC1608J000CS Resistor, chip 0 ohm 6

3 0RHSS103DJTS RC1608J103CS Resistor, chip 10K 1 R300

3 0RHSS220DJTS RC1608J220CS Resistor, chip 22 ohm 7

3 0RHSS474DJTS RC1608J474CS Resistor, chip 470K 2 R223,R226
3 0RHSS750DJTS RC1608J750CS Resistor, chip 75 ohm 3 C211,C213,R208
3 0RYSS330FJTS RP164PJ330CS Resistor, Array chip 3216 4 RA01,RA02,RA05,RA06
3 1DZSC5231BTS MMSZ5231BS Zener diode, chip 5.1V 1 ZD202
3 1ICMS9883CBS MST9883C-110 IC, MST9883C 1 IC300
3 1ICSTLD33TTS LD1117S33TR LD1117S33TR-3.3V 1 IC301

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUIT NO

C300,C301,C302,C303,C306,
C307,C308,C309,C310,C313,
C314,C315,C316,C317,C323,
C324,C325,C327,C328,C329

R221,R222,R204,R304,R308,
R310

R207,R305,R306,R307,R309,
R311,R312

GRLT41CS001C GR, COMPONENT SM D

분류

3 0RHSS000DJTS RC1608J000CS Resistor, chip 0 ohm 6

3 0RHSS750DJTS RC1608J750CS Resistor, chip 75 ohm 3 C211,C213,R208
3 0RHSS220DJTS RC1608J220CS Resistor, chip 22 ohm 1 R207
3 1DZSC5231BTS MMSZ5231BS Zener diode, chip 5.1V 1 ZD202
3 0RHSS474DJTS RC1608J474CS Resistor, chip 470K 2 R223,R226
3 0CHSS104DZTS CL10F104ZANC Capacitor, chip 0.1UF 3 C136,C137,C138,

P/N VENDOR P/N DESCRIPTION Q,TY CIRCUI T NO

R221,R222,R204,R144,R154,
R155

LT-20AMF SERVICE MANUAL

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49

25. Block Diagram

Front Control

LED

Key

IR

BLOCK DIAGRAM

LCD Panel

Regulator

LVDS Rx

3.3V

20” CMO : 5V
20” LPL : 12V

3.3V

2.5V/3.3V

X-tal

12Mhz

LA4282

L

RGB
H/V

5V

BA7657F

RGB
H/V

Built-in LVDS-Tx

Scaler

MVRL

Built-in ADC

YUV (4:2:2)

I2C

U-com
Text/Caption

Y

AD9883

480p
720p

1080i

RGB
H/V

D-sub Component Sound L/R S-VHS A/V IN

Cb
Cr

VCTI

Video Processor
Sound Processor
IF Processor

LR

CYLRCVBS

R

1.8V/3.3V
5V/8V

12V

20.25Mhz

X-tal

H/P

LRCVBS

A/V OUT

SPK-L

SPK-R

IF

5V/33V

T
U
N
E
R

LT-20AMF SERVICE MANUAL

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50

26. Connection diagram

2P x3

I
N
V
E
R
T
E
R

PC

B

CONNECTION DIAGRAM

PANEL

50P

2P2P

10P

MAIN PCB

RIGHT SPKLEFT SPK

2P

10P

A
D
A
P
T
E
R

CONTROL PCB

5P

IR+LED PCB

3P

AC INPUT

LT-20AMF SERVICE MANUAL

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