M26DIGB19 service manual.pdf

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Service Manual

LC-26G78 （ M26DIGB19 ）

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LCD TV Service Manual

1. Diagram:

Panel Display

Backlight

control

interface

LVDS

CONNECTOR

Audio

Out cable

Backlight

PWR/CTR

Cable

LVDS CABLE

Amplifier PWR

CABLE

CN19

CN1

CN29

CN18

CON4

MAIN POWER

CABLE

CON2

Side AV

Board

CON10

CON9

Power Board

CN28

Main Board

CN15

CON3

DVR

CABLE

CON1

CN5

CN4

AC POWER

CORD

SPK CABLE

IR

CABLE

KEY

CABLE

AC

KeyBoard

IR Board

PLUG

Note:connector actual position refer to PCBA photo

1.1 Function of Board ：

1) Main Board: Control all input signals, Decode the video signal, De-interlace, and send digital signals (LVDS signal)

sent from image Board and display;

2) Power Board: All the power supply;

3) Panel: Display all images;

4) IR Board: Receive remote operation;

5) Key Board : buttons of POWER 、 SOURCE 、 MENU 、 VOL+/- ,Channel +/-;

6) AC Power Input: connecting AC power;

7) S-VIDEO Board: S-VIDEO signal input.

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MAIN BOARD INTRODUCTION

1.2 FUNCTION LAYOUT

TOP VIEW OF LCD CONTROL BOARD

NOTE: The optional connectors and terminals are marked with “ * ”.

1 * 2 3 * 4 5 6 7

* 8

* 9

* 10

11

12

13 * 14 15 * 16

17 * 18

* 19 * 20 * 21

22

23

24

25

26 27 28 29

* 30

31

32 33 34 35

36

37

38

2. Main Board and Power Service Chart

2.1 INTERFACE FUNCTION DESCRIPTION

NOTE: The optional connectors and terminals are marked with “ * ”.

NO.

DESCRIPTION

NO.

DESCRIPTION

1(CN29)

Inverter Connector

DVD YPbPr Input Connector

* 20(CN2)

* 2(CN14)

DVD Power Supply Connector

DVD CVBS Input Connector

* 21(CN6)

3(CN28)

Main Power Supply Connector

22

HDMI1 Input

* 4(CN9)

PDP Control Connector

23

HDMI2 Input

5(CN30)

Power Jumper for Panel

24

PC-RGB Input

6(CN1)

LVDS Panel Connector

25

PC-Audio Input

7(CN5)

Key Board Connector

26

Component-Pb Input

* 8(CN15)

SD Connector

27

Component-Y Input

* 9(CN22)

Simluator Connector

28

Component Audio (Right) Input

* 10(CN12)

IPOD Power Supply Connector

29

Component Audio (Left) Input

11(CN18)

Speaker Connector

* 30

CI Slot

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MAIN BOARD INTRODUCTION

Amplifier Power Supply Connector

12(CN19)

31

S-VIDEO Input

13(CN4)

32

Component-Pr Input

IR Receiver & LED Indicator Connector

* 14(CN3)

External HDMI Connector

33

CVBS Input

CVBS/S-Video Audio (Right) Intput

15(CN13)

Debugging Interface

34

* 16(CN11)

Green Power Supply Connector

35

CVBS/S-Video Audio (Left) Input

* 17(CN10)

DVD Communication Interface

36

SCART1 Input

* 18(CN17)

DVD Audio Input Connector

37

SCART2 Input

* 19(CN7)

IPOD Module Interface

38

RF Input

2.2 PCB DIMENSIONS

The height of the control board is 32.5mm.

2.3 KEY BOARD SCHEMATICS

K0

K1

K2

K3

K4

K5

K6

GND

CN1

S1

S6

S5

S2

S3

S7

S4

8

7

6

5

4

3

2

1

GND

8PIN

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MAIN BOARD INTRODUCTION

2.4 IR BOARD SCHEMATICS

2.5 INTERFACE DEFINITION

CN28 (10PIN/2.54): MAIN POWER SUPPLY CONNECTOR

NO.

SYMBOL

DESCRIPTION

ELECTRIC CURRENT

1

5VSB

Power Supply Standby

120mA

2

PWD

Standby Control

---

3

GND

Ground

---

4

GND

5

P5V

Panel Electric Current

(Refer to the Connected Panel)

+5V Panel Power Supply

6

P5V

7

5V

1200mA

+electric Current of extended module

+5V Power Supply

8

5V

9

GND

Ground

---

300mA+Panel Electric Current

+electric Current of extended module

10

12V

+12V DC Power Supply

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