Samsung Tv Lcd Ltm1525x

8/6/2019 Samsung Tv Lcd Ltm1525x

1/100

TFT-LCD TV/M ONITOR

Chassis Model

M B15 U* LTM 1 525

M B1 5J* LT1 5S1 3C

Manual

SERVICETFT-LCD TV/M ONITOR 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 Descripti on

CONFIDENTIAL


2/100

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 M onitor

1. When servicing the LCD Monitor 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 m onitor to the user, perform th e

following safety checks:

1. Inspect each lead dress to make certain that the

leads are not pinched or that hardw are is not

lodged between the chassis and other m etal parts in

the monitor.

2. Inspect all protective devices such as nonmetallic

control knobs, insulating materials, cabinet backs,

adjustment and compartm ent 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 curren t tester or a m etering system

that complies with American National Standar ds

Institute (ANSI C101.1, Leakage Current for

Appliances), and Und erwriters Laboratories (UL

Publication UL1410, 59.7).

Figure 1-1. Leakage Current Test Circuit

4. With the unit completely reassembled, plug the AC

line cord d irectly into a 120V AC outlet. With the

units AC switch first in the ON position and then

OFF, measure the current between a kn own earth

ground (metal water pipe, conduit, etc.) and all

exposed m etal parts, including: metal cabinets,

screwheads and control shafts. The current

measur ed sh ould not exceed 0.5 milliamp . Reverse

the power-plug p rongs 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 rep lacing them w ith

components rated for higher voltage, wattage, etc. Parts

that have special safety characteristics are identified by

on schematics and p arts lists. A substitute

replacement that does not have the sam e safety

characteristics as the recommend ed rep lacement p art

might create shock, fire and / or other hazard s. Productsafety is under review continuou sly and new

instructions are issued whenever ap prop riate.

LTM 1525/LT15S13C 1-1

CONFIDENTIAL

1 Precautions

Follow these safety, servicing and ESD precautions to prevent dam age and to protect against potential hazards such as

electrical sh ock.

1-1 Safety Precautions

DEVICEUNDERTEST

TEST ALLEXPOSED METAL

SURFACES

(READING SHOULDNOT BE ABOVE 0.5mA)

LEAKAGECURRENTTESTER

2-WIRE CORD

ALSO TEST WITHPLUG REVERSED

(USING AC ADAPTERPLUG AS REQUIRED)

EARTHGROUND

!


3/100

1-2-1 General Servicing Precautions

1. Always unplug the units AC power cord from the

AC power sour ce and disconnect the DC Power

Jack before attempting to:

(a) remove or reinstall any componen t or assembly,

(b) disconnect PCB plugs or connectors, (c) connect

a test compon ent 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 clamp ed to p revent 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 arou nd th e

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 wrist-

strap d evice. 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 condu ctive surface such as aluminum foil to

prevent accum ulation 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 pan els, input term inals and earp hone jacks).

5. Insulation Checking Procedure: Disconnect the

power cord from the AC source and turn the power

switch ON. Connect an insulation r esistance meter

(500 V) to the blad es of the AC p lug.

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 instruments ground lead tothe instrum ent chassis ground before connecting

the positive lead; always r emove the instruments

ground lead last.

6. Do not remove a replacement ESD from its

protective package until you are r eady to install it.

Most replacement ESDs are p ackaged with leads

that ar e electrically shorted together by condu ctive

foam, aluminum foil or other cond uctive 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 thechassis or circuit and observe all

other safety precautions.8. Minimize body motions when handling

unp ackaged 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 LTM 1525/ LT15S13C

CONFIDENTIAL

1-3 Electrostatical ly Sensitive Devices (ESD) Precautions

Some semiconductor (solid state) devices can be easily damaged by static electricity. Such components are commonly

called Electrostat ically Sensitive Devices (ESD). Examples of typ ical ESD devices are int egrated 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 p recautions, always follow the safety p recautions.


4/100

CONFIDENTIAL

2 Product Specifications

2-1 Specifications

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 (Automat ic)Vertical : 56 Hz ~ 75 Hz (Automat ic)

Display Colors 16.7 M illion colors

M aximum Resolut ion Horizontal : 1024 PixelsVertical : 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

M axi mum Pi xel Clock rat e 80 M Hz

Active Display

Horizontal/Vertical

AC power volt age & 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 Temperat ure : -4 F ~ 113 F (-20 C ~ 45 C)Humidity : 5 % ~ 95 %

TV System

Antena Input 75, Coaxial Cable

MAX Internal speaker Output : Right => 3WLeft => 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

LTM 1525/LT15S13C 2-1

Item Description

304.1 mm / 228.1 mm

Tunning Frequency Synthesize

System NTSC-M

Sound STEREO


5/100


2-2 LTM 1525/ LT15S13C

CONFIDENTIAL2-2 Pin Assignments

Pin Separate

12

3

4

5

6

7

8

9

10

11

12

13

14

15

RedGreen

Blue

GND

GND (DDC Return)

GND-Red

GND-Green

GND-Blue

No Connection

GND-Sync./Self Test

GND

DDC Data

H-Sync.

V-Sync.

DDC Clock

Pin Separate

1

2

3

4

5

GND

Y

C

GND

GND

RCA Green

RCA Blue

RCA Red

RCA White

RCA Red

Y

GND

Pb (Cb)

GND

Pr (Cr)

GND

Audio L

GND

Audio R

GND

2-2-1 D-SUB

2-2-3 S-Video

2-2-2 DVD, DTV

RCA White

RCA Red

CVBS

Audio L

GND

Audio R

GND

2-2-4 A/V

RCA Yellow


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LTM 1525/LT15S13C 2-3

CONFIDENTIAL2-2-5 D4 CONNECTOR

Pin Separate

12

3

4

5

6

7

8

9

10

11

1213

14

YY_GND

Pb

Pb_GNd

Pr

Pr_GNd

Preliminary Line1

Line1

Line5

Preliminary Line2

Line3

Switch GNDPrlimainary Line3

Switch

5V

2.2V

0V

1080

720

480

60p

-

60i

16 : 9

letter box

4 : 3

Line 1

(Resolution)

Line2

(i/p)

Line3

(Aspect)


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2-4 LTM 1525/ LT15S13C

CONFIDENTIAL


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LTM 1525/LT15S13C 2-5

CONFIDENTIAL


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2-6 LTM 1525/ LT15S13C

CONFIDENTIAL2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard

for computer-generated video signals.

ssssss

ss

2-3-1 LCD Panel M ode : 1 mode


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LTM 1525/LT15S13C 2-7

CONFIDENTIAL

ssssssss

ssssssss

ssssssss

ssssssss

ssssssss

2-3-2 Supported M odes (1)


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2-8 LTM 1525/ LT15S13C

CONFIDENTIAL

ssssssss

ssssssss

ssssssss

ssssssss

ssssssss



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LTM 1525/LT15S13C 2-9

CONFIDENTIAL

s

s

s

s

s

s

s

s



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Memo


2-10 LTM 1525/ LT15S13C

CONFIDENTIAL


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LTM 1525/LT15S13C 3-1

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 electrostat ically sensitive devices. Use caution when handlingthese components.

3-1 Disassembly

Cautions:1. Disconnect the m onitor 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 p air of retaining clips (near the left and

right hinges) To remove the stand, simply p ull

it away from th e unit and the retaining clips

will release autom atically.

2. Remove the two phillips screws (left and

right).

3. Separate the case halves (front/ back) starting

at the bottom/ edges.


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CONFIDENTIAL3 Disassembly and Reassembly

3-2 LTM 1525/ LT15S13C

3-2 Reassembly

Reassembly procedures are in the reverse order of Disassembly procedures.


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CONFIDENTIAL

LTM 1525/LT15S13C 4-1

4 Alignments and Adjustments

4-1 General Alignment Instuction

1. Usually, a color TV-VCR needs only slight touch-up ad justment u pon installation.

Check the basic characteristics such as h eight, horizontal and v ertical 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 pow er source with voltage and frequency as specified on

the backcover nameplate.

6. Do not attempt to connect or disconnect any wire wh ile the TV is turned on . Make sure

that the pow er cord is d isconnected before replacing any parts.

7. To protect aganist shock hazard,use an isolation transform.


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4-2 LTM 1525/ LT15S13C

CONFIDENTIAL

R F 1 2 7 7 51 2 7 7 5

1 3 0 8 2

2 1 8 D A

1 9 5 C3

2 4 8 F8

2 0 8 DO

1 6 0 B7

1 6 0 6 8

1 2 0 7 0

1 3 3 8 5

O E

0 6 / 2 4 T -M B0 1 -1 0 2

0 6 / 2 4 T -M B0 1 -1 0 2

O E

4-2 Factory M ode Adjustments

4-2-1 Entering Factory M ode

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 M ode Tree (U.S. Only)


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LTM 1525/LT15S13C 4-3

CONFIDENTIAL

OE

0 6 / 2 4 T -M B0 1 -1 0 2

OE1 5

0 6 / 2 4 T -M B0 1 -1 0 2

OE

OE

0 6 / 2 4 T -M B0 1 -1 0 2

0 6 / 2 4 T -M B0 1 -1 0 2


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4-4 LTM 1525/ LT15S13C

CONFIDENTIAL

RF1 2 7 7 5

1 2 7 7 5

1 3 0 8 2

2 1 8 D A

1 9 5 C3

2 4 8 F8

2 0 8 D O

1 6 0 B7

1 6 0 6 8

1 2 0 7 0

1 3 3 8 5

O4

0 6 / 2 4 T -M B0 3 -1 0 2

0 6 / 2 4 T -M B0 3 -1 0 2

O 4

4-2-3 Factory M ode Tree (Japan Only)


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LTM 1525/LT15S13C 4-5

CONFIDENTIAL

0 4

0 6 / 2 4 T -M B0 3 -1 0 2

0 4

1 5

0 6 / 2 4 T -M B0 3 -1 0 2

0 4

0 4

0 6 / 2 4 T -M B0 3 -1 0 2

0 6 / 2 4 T -M B0 3 -1 0 2


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Memo


4-6 LTM 1525/ LT15S13C

CONFIDENTIAL


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CONFIDENTIAL

LTM 1525/LT15S13C 5-1

5 Troubleshooting

5-1 No Power

Does proper DC 14V appear at DC

jack connected to CN801?

Check SMPS PCB and Adapter.

Yes

No

No

No

No

No

Does proper DC 3.3V_A

appear at FT852?Check IC811.

Check IC812.

Yes

Does proper DC 2.5V_A

appear at Pin 3 of IC802?Check IC802.

Yes

Does proper DC 3.3V_Bappear at T807?

Check IC805.

Yes

Yes

Does proper DC 2.5V_Bappear at Pin 4 of IC806?

Check IC806.

WAVEFORM S

IC811 #2

IC805 #1

IC812 #2

1

2

3


23/100

CONFIDENTIAL5 Troubleshooting

5-2 LTM 1525/ LT15S13C

5-2 No Video (PC Signal)

Power indicator is green.

Does the signal appear

at C491, C489, C488of R, G, B input? Check CN401 and cable.

Yes

No

No

No

No

No

Yes

Does the clock pulseappear at output of

T201, T202, T203 ~ RA356?Check related circuit of IC350.

Yes

Does the clock pulseappear at R354?

Check R354 and related

circuit of R354.

Yes

Does the clock pulseappear at X201?

Check X201 and related

circuit of X201.

Yes

Does the clock pulse appear atoutput of RA301~RA306?

Replace RA301 ~ RA306, IC300.

Yes

Replace LCD Panel.

WAVEFORMS

C4914

R3545

X2016


24/100


LTM 1525/LT15S13C 5-3

5-3 No Picture (TV, Video, S-Video, DVD, DTV)

Check Pin 185, 196 (S-Video)and Pin 184 (VCR) and Pin 183

(RF-CVBS) of IC200 (DPTV_3D)?

Check Pin 16 of CN828at TV color bar.

Yes

Check analog RGB out Pin 27, 28,29 and check 3.3V_RA Pin 199,

181, 192, 194, 205 at IC200?Check the IC813 and IC200.

Yes

Check the IC200, C285, C241 and C249.

WAVEFORM S

CN828 #167No

No


25/100


5-4 LTM 1525/ LT15S13C

Does the signal appear atPin 67 (Tuner sound signal) and

Pin 47, 48 (PC sound) and Pin 56, 57(VCR sound) and Pin 50, 51 (DVD)

of IC 919 (MSP3421)?

Check the CN401(PC Sound) and theSK3(VCR Sound) and the SK2

(DVD/DTV Sound) the CN828(Tuner).

Yes

Does the signal appear at Pin 27,

28 of IC919 (MSP3421)?Check the Pin 3 of IC919 and

related circuit of IC919.

Yes

Does the signal appear

at R505, R506?Check the IC503 (Audio amp) and

related circuit of IC503.

Yes

Replace the speaker.

5-4 No Sound

WAVEFORM S

IC919 #38

No

No

No


26/100

LTM1525/LT15S13C

6 Exploded View and Parts List


27/100

Memo

6 Exploded View & Parts List

6-2


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8 Block Diagram

LTM1525/LT15S13C 8-1

CONFIDENTIAL


89/100

8 Block Diagrams

8-2 LTM1525/ LT15S13C

CONFIDENTIAL


90/100

LTM1525/LT15S13C

+3.3V

+3.3V

LUDSGND

GND

TXO-

TXO+

GND

TX1+

TX1-

TX2-

TX2+

GND

GND

GND

TXCLK-

TX3-

TX3-

GND

CN701

TXCLK+

CN901

+5V

TUNER_GND

TUNER_CVBS

SCL2

SDA2

GND

SIF

LED

IRAVI_R

AVI_L

GND

GND

COMP_RIN

COMP_LIN

+8V

GND

GND

CUBS

16

17

18

19

20

21

S_VIDEO_Y

S_VIDEO_C

NC

BRIGHT CONTROL

NC

INVERTER ON/0FF

NC

GND

GND

GND

GND

+14V

+14V

+14V

CN754

GND

KEY2

KEY1

CN706_1CN505

RED

GND

DDC_DATA

DDC_CLK

DDC_5V

POWER_KEY

GND

GND

GND

GND

GND

20

21

22

23

24

25

26

27

28

29

30

GND

31

VCC

VCC

VCC

VCC

GND

GND

GND

GND

GAMMA

16

14

9 Wiring Diagram

9-1 Main Diagram


91/100

9-2 Input Diagram

9 Schematic Diagrams

9-2

+5V

TUNER-GND

TUNER-CUBS

SCL2

SDA2

GND

SIF

LED

IRGND

AVI_R

AVI_L

+8V

COMP_RIN

COMP_LIN

CUBS

S_VIDEO_Y

GND

CN182

GND

GND

S_VIDEO_C

CN505

VCC

VCC

GND

GND

GND

GND

VCC

VCC

TUNER

CN828

NC

+14V

GND

CN801

PC_LIN

PC_RIN

GND

PC_LIN

PC_RIN

CN403

GND

GND

NC

CN921

YIN

CIN

GND

GND

COMP-RIN

GND

SK2

GND

COMP-LIN

GND

GND

CVBS

CVBS

GND

AUDIOLIN

AUDIOLIN

SK3

GND

AUDIORIN

AUDIORIN

GND

COMP-Y

COMP-Y

GND

COMP-Pb

COMP-Pb

SK1

GND

COMP-Pr

COMP-Pr

GND

BLUE

GREEN

GND

RED

V_SYNC

GND

GND

CN575

POWER_KEY

DDC_CLK

DDC_DATA

DDC_5V

GND

GND

GND

GND

GND

GND


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10-2

CN4014 R3545


94/100


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10-4

X2016


96/100


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10-6

IC811 #2 IC805 #1 IC812 #21 2 3 IC919 #38


98/100

10-4 Input_SUB Part Schematic Diagram

LTM1525/LT15S13C


R/G/B Input

S_Video Input

CVBS Input

PC Audio

COMP Audio

D4 Terminal

Power_Key

(Y / Pb / Pr)

(Y / C)

RF Input

FROM ADAPTER

L152N

N L 15 1

75R463

R425

R144

10K1/16W

R424

100

1

23

4

56

100

1/16W75

UJB0202A

SK2

R870

C461

100pF

R803

100 R423

MMBD4148SE

12

3

100

R479

1K

D407

100pFC409

1K

R474

100pFC462

RLZ8.21

2

3

+5V_A

ZD401

100pFU14

3.3K

R422

N L805

RLZ8

.2

D412

12

3

1

2

3

ZD413RLZ8.2

OP1LTST-C150GKT

L401

N

75R428

100

R804

R814975

8

9

MO50V

1nFC199

UJB0303A

SK3

1

23

4

56

7

R426100

100pFC466

1/16W240

R8152

RLZ8.2ZD402

12

3

ZD407

RLZ8

.2

12

3

1

2

3

C

E

D405KDS184

+5V_A

2SC2412K-QQ102

B

1/16W 10K R491

16V22uFC8432

L4121.5uH

T452

1

+5V_A

10

1/16W75

R872

dcjhp_10p

4

56

7

8

9

D410

RLZ8

.2 12

3

CN403

POWER_JACKCN801

3

12

1

2

3

N

L402

12

3

RLZ8

.2

ZD409

D40612

3

ZD406

RLZ8

.2

3GND

1OUTPUT

2VCC

MMBD4148SE

R462

U13746VF

75

D402

BZX84C5V1

1 A2B

3 C

C467100pF

12

3

L410N

3

MMBD4148SE

D408

D411

RLZ8

.2 12

12

13

14

15

L404N

1

2

3

4

5

6

7

8

9

10

11

1

CN401

d_

sub15p

RLZ8

.2

ZD405

12

3

T453

NL403

1

2

3

4

5

6

RLZ8.2U1

1

2

3

PJ6024B

CN921

BZX84C5V1

U16

A1

B2

C3

RLZ8

.2

ZD408

12

3

R4711K

R42775

1/16W240

R8151

16V100uF

C847

1

2

3

R473

ZD410

RLZ8

.2

1K

LTST-C150GKTOP2

220nFC848

R4701K

+5V

C897

100uF16V

2

3

12

3

RLZ8.2ZD457

1

A1

B2

C3

RLZ8.2ZD403

L4111.5uH

BZX84C5V1

D401

RLZ8

.2

ZD412 1

2

3

1 A2B

C3

1 A

B2

C3

BZX84C5V1

D403

T451

1

BZX84C5V1

D404

100pF

C465 C470100pF

C

100pFC410

U17

BZX84C5V1

1 A2B

3

3

BZX84C5V1

D502 A1

B2

C3

RLZ8.2ZD404

12

R4921/16W 100

GND1

1112

GND2

GND3

13

14

GND4

7IF

1NC

N_C 6

5SAS

SCL3

SDA 4

SUPLVALCN828

AF10

2B

9BP

CVBS8

CN102

1

2

3

4

5

6

7

8

9

10

22

1/16W

CONN8P_STRAIGHT

1KR472

R148

R510

+5V

8

9

10

11

12

13

14

1KCN402

14P

1

2

3

4

5

6

7

220nF

C849

BZX84C5V1

D501 A1

B2

C3

1 A2B

3 C

+3.3V_A

D503

BZX84C5V1

R871

751/16W

L405

N

75R464

1/16W

4.7KR122

1

2

3

68

R814

100uFC113

ZD411

RLZ8

.2

R429

D4_L1

D4_L2COMP_Pb

COMP_Y

TUNERGND

TUNERGND

COMP_PrD4_L3

75

tjunctions

CVBS

DDC_DATA

DDC_CLK

DDC_5V

TUNERGND

V_SYNC

RED

BLUE

GREEN

H_SYNC

PC_INT

TUNERGND

LED

AVI_R

S_VIDEO_Y

IR

COMP_RIN

COMP_LIN

AVI_L

PC_RIN

PC_LIN

S_VIDEO_C

TUNERGND

7


99/100


10-8

CN828 #167


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