Daewoo EX236E2BCFA Schematic

S/M NO. :

Service Manual

LED TV

CHASSIS :

SE-V26XB

Model : EX236E2BCFA

Caution : In this Manual, some parts can be changed for improving. their

performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List)in Service Information Center.

Contents

Safety Precaution ................... 3

Preliminary Troubleshooting .............................................................................................................................. 4

LT908D(South America) Specification ....................................... 5

LT716B-1 (South America) Specification ...................................................................................................... 12

Product Specification ...................... 19

Service Remote Controller ............................ 21

Block Diagram ................ 22

LT908X Trouble shooting ................................................................................................................................ 23

LT716X Trouble shooting ................................................................................................................................ 31

Schematic ............. 40

Software Upgrade Method .......................................................................................................................... 57

Service part list .................. 63

Mechanical Exploded View .............................. 65

1. Safety Precaution

When moving or laying down a LCD Set, at least two people must work together. Avoid any impact

towards the LCD Set.

Do not leave a broken LCD Set on for a long time. To prevent any further damages, after checking the

condition of the broken Set, make sure to turn the power (AC) off.

When opening the BACK COVER, you must turn off power (AC) to prevent any electric shock.

When loosening screws, check the position and type of the screw. Sort out the screws and store them

separately for reassembling. Because screws holding PCBs are working as electric circuit grounding, make

sure to check if any screw is missing when assembling / reassembling. Do not leave any screws inside

the set.

A LCD Set contains different kinds of connector cables. When connecting or disconnecting cables, check

the direction and position of the cable beforehand.

Connect/disconnect the connectors slowly with care especially FFC (film) cables and FPC cables. Do not

connect or disconnect connectors instantaneously with force, and handle them carefully for reassembling.

Connectors are designed so that if the number of pins or the direction does not match, connectors will

not fit. When having problem in plugging the connectors, check their kind, position, and direction.

2. Preliminary Troubleshooting

LCD TV does not response or remote controller does not work.

Check the power cord to be plugged.

Check the battery of the remote controller.

Sound is discontinuous or broken sometimes.

Check if [SOUND] -> [Bass] is Min or Max.

Set the [SOUND] -> [Treble] is Min or Max.

Picture of analog program is noisy.

Check the RF cable connection.

Check if [Picture] -> [N.R] is ON.

Change the [Channel] -> [Fine Tune] value.

Sound is not generated in HDMI mode.

Reconnect HDMI jack.

DVI signal has no sound. Check the output signal of device to be connected to LCD TV.

If you want to use DVI-HDMI cable, you should also connect audio cable into the LCD TV.

In spite of 'Auto Setup', picture size is not completely adapted to the screen in PC mode.

Check if the input signal is available.

Ensure that the desktop has no black area.

Some errors (picture position problem) will be occurred according to certain video card. In this case,

you should adjust 'Phase', 'Clock', 'H.Position', 'V.Position' control.

In spite of 'Auto Setup', picture is not clear in the PC mode.

Adjust 'Phase' control.

3. SPECIFICATION

1) GENERAL DESCRIPTION

The board is a multi-purpose LCD/LED TV control board which can support LCD/LED panel

with dual/single LVDS interface. It supports resolution up to 1920x1080.

The board supports CC, Vchip, MTS, Component, HDMI, PC-RGB, CVBS, S-Video and analog

TV. It includes an audio power amplifier which can support 2X3W (4Ohm) output.

2) FEATUERS

Chipset

TSUMV26KE-LF

Market Area

South America

OSD Language

English, French, Spanish, Portuguese

Panel

Interface dual/single LVDS

Resolution Up To 1920x1080

Video Input

TV Tuner Receiving Range 55.25MHz-801.25MHz

Input Impedance 75fi

Video System PAL/NTSC

Sound System M/N

MTS

Max. storage Channels 181CH

PC-RGB Format Up to 1920x1080@60Hz

CVBS Video System PAL/NTSC

Video Level 1.0 Vp-p ±5%

S-Video S-Y:0.714Vp-p±5% S-C:0.286Vp-p±5%

HDMI 480i, 480p, 576i, 576p, 720p, 1080i, 1080p

Component 480i, 480p, 576i, 576p, 720p, 1080i, 1080p

Audio Input

PC-RGB Earphone Input 0.2 - 2.0 Vrms

CVBS L/R RCA Input 0.2 - 2.0 Vrms

Component

Audio Output

Frequency

Response

120Hz - 14000Hz @±3dB (1KHz 0dB reference

signal)

Max Output

Power

2x2.5W(4Ohm) THD+N<10%@1KHz

Power

Requirement DC +12V Power Supply

To Panel 3.3V(Max 700mA), 5V, 12V

Management Low power consumption mode,

standby < 0.6W

ome Filter

einterlace

Weak signal

enhancement

YES

Noise reduction

YES

Key Function

MENU, CH+, CH-, VOL+, VOL-, INPUT, POWER

Terminlas Input

TV 1 F-Connector 75ft HDMI 1 HDMI terminal PC-RGB 1 D-SUB 15Pin terminal CVBS 1 RCA terminal Component 3 RCA terminals

CVBS Audio

2 RCA terminals Component Audio PC-RGB Audio 1 Earphone terminal

Output

Earphone 1 Earphone terminal CVBS & Audio Out 3 RCA terminals(CVBS, R,L)

4) FUNCTION LAYOUT

TOP VIEW

FRONT VIEW

SIDE VIEW OF T.VST26.7X

CN19 :

Key

CN14 :

CN17 : LVDS

Interface

CN15 :

CN24 :

CN3 :

Inverter

CN2 :

CN26 :

CN20 :

Speake

Coaxial :

DC Power HDMI In

PC-RGB

PC Audio

CVBS

Monitor Output

Ear-

phone

Coaxial

Component

Pb/Cb CVBS

AV In

R L Pr

/Cr

RF In

5) Connector Specification

♦ CN3(6PIN/2.0): INVERTER CONNECTOR

NO. SYMBOL DESCRIPTION

1 12V + 12V DC Power Supply

2 12V

3 BLO Back-Light ON/OFF Control for Panel

4 ADJ Brightness Adjustment for Panel

5 GND Ground

6 GND

♦ CN17(2x15PIN/2.0): LVDS INTERFACE

NO. SYMBOL DESCRIPTION

1 VSEL Power Supply for Panel

2 VSEL

3 VSEL

4 GND Ground

5 GND

6 GND

7 RXO0- LVDS ODD 0- Signal

8 RXO0+ LVDS ODD 0+ Signal

9 RXO1- LVDS ODD 1- Signal

10 RXO1 + LVDS ODD 1+ Signal

11 RXO2- LVDS ODD 2- Signal

12 RXO2+ LVDS ODD 2+ Signal

13 GND Ground

14 GND

15 RXOC- LVDS ODD Clock- Signal

16 RXOC+ LVDS ODD Clock+ Signal

17 RXO3- LVDS ODD 3- Signal

18 RXO3+ LVDS ODD 3+ Signal

19 RXE0- LVDS EVEN 0- Signal

20 RXE0+ LVDS EVEN 0+ Signal

21 RXE1- LVDS EVEN 1- Signal

22 RXE1 + LVDS EVEN 1+ Signal

23 RXE2- LVDS EVEN 2- Signal

24 RXE2+ LVDS EVEN 2+ Signal

25/26 GND Ground

27 RXEC- LVDS EVEN Clock- Signal

28 RXEC+ LVDS EVEN Clock+ Signal

29 RXE3- LVDS EVEN 3- Signal

30 RXE3+ LVDS EVEN 3+ Signal

♦ CN19(14PIN/2.0): KEY & IR BOARD CONNECTOR

NO. SYMBOL DESCRIPTION

1 5V + 5V DC Power Supply

2 RED Red Indicator

3 GRN Green Indicator

4 IR IR Receiver

5 GND Ground

6 K0 K0

7 K1 K1

8 K2 K2

9 K3 K3

10 K4 K4

11 K5 K5

12 K6 Power (Only for power function.)

13 K7 K7

14 GND Ground

♦ CN20(4PIN/2.54): SPEAKER CONNECTOR

NO.

OL DESCRIPTION

1 LO Audio Left Channel Output

2 GND Ground

3 GND

4 RO Audio Right Channel Output

4. Product Specification

Available Input Signal

i) TV Mode

Color Standard : NTCS, PAL-M/N Reception Channel : Ch 2-13 (VHF), Ch 14-69 (UHF), Ch 1, 14~125(Cable) Sound Transmission System : FM Mono, 2 Carrier IF & Subcarrier:

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