Daewoo EX236E2BCFA User manual

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
C
ome Filter 2D
D
einterlace 2D
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 :
Ke
y
CN14 : NC CN17 : LVDS Interface CN15 :
NC
CN24 :
NC CN3 : Inverte
r
CN2 : NC CN26 :
NC
CN20 :
S
p
eake
r
Coaxial :
NC
DC Powe
r
HDMI In
PC-RGB
In PC Audio
In CVBS
Monitor Out
p
ut
R
L
Ear-
phone Coaxial NC
Y
Co
m
po
n
e
n
t
In
Pb
/
Cb CVBS
AV In
R
L
P
r
/
C
r
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.
B
OL DESCRIPTION
1 LO Audio Left Channel Output
2 GND Ground
3 GND
4 RO Audio Right Channel Output