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

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:

PIF : 45.75MHz
SIF : 41.25MHz
Sound Subcarrier: 4.5MHz, 4.72 MHz
Color Subcarrier: 3.58MHz
ii) Multimedia Mode
Resolution V-freq HDMI PC(D-Sub) Component Standard
640 X 480 60Hz O O X Industry Standard
800 X 600 60Hz O O X VESA Guidelines
1024 X 768 60Hz O O X VESA Guidelines
1280 X 1024 60Hz O O X VESA Standard
1360 X 768 60Hz O O X
1440 X 900 60Hz O O X
1680X1050 60Hz O O X
720 X 480i 60Hz O X O
720 X 576i 50Hz O X O
720 X 480p 60Hz O X O
750 X 576p 50Hz O X O
1280 X 720p 50Hz O X O
60Hz O X O
1920 X 1080i 50Hz O X O
60Hz O X O
1920 X 1080p 50Hz O XO
60Hz O XO
Note :
When you connect with component, PC (D-Sub), and HDMI, you must check
the input resolution of external devices.
So if this mode is used at PC mode, the screen can be enlarged.
5. Trouble shooting

一
一一
一、
、、
、
一
一一
一、
、、
、Power supply Trouble Power supply Trouble
Whether CN2 or CN12 is +5V?
Make sure the power board
input voltage is 5V
power on and check the 2th of U4
is 3.3v?
whether R26 is
welded ? Check L4、L11、
FB3、FB4, whether
they damage?
Make sure whether next
class circuit of L4,L11 is
not ground short-circuit
Change the 5V,12V
power boards
U4 Dry joint or
damage
Find the ground
short-circuit
point or change
main chip U14 Change
damaged
circuit
component
Y
N
Y
N
Y
YN
Y
N
Y
N
Whether power board
input 5v voltage ,or
make sure main board
not ground short-circuit
Whether power
board input 5v
voltage ,or make
sure main board
not ground
short-circuit
N
whether U6 work
normally or change
main chip

Flower screen
Whether the driver-lcd wire contact ok?
Is LCD OK?
Change the driever-lcd wire
Y N
Change LCD
N Y
Check output network (eg. U14 driver-lcd)
YN
Check the circuit of U14 Repair this circuit
二
二二
二、
、、
、Display Trouble Display Trouble （
（（
（flower screen
flower screenflower screen
flower screen）
））
）

White screen
Is driver-lcd voltage normal?
(decided by using screen)
N Y
Q8/AO3401’s G-pole voltage
(3.3V～0Vor5V~0) Whether U14 has signal output?
CN17 contact badly
Or Q8 damage Check circuit of U14 pins
Or U14 I/O damage
NY
LCD damage
or driever-lcd wire damage Change U14
三
三三
三、
、、
、Display Trouble Display Trouble （
（（
（white screen）
））
）
YN

Black screen
Whether the BLON of CN3 has 5V?
Is inverter power is normal?
Check the circuit from BLON pin to U14
or U14 I/O damage (pin 67)
N
N Y
Y
Check and repair power supply Inverter power damage
四
四四
四、
、、
、Display Trouble Display Trouble （
（（
（black screen）
））
）

No Sound
Whether the audio signal input
Check external
Audio equipment
check the 7th pin of U21/TDA1517P,
Whether there is more than 11V power supply
NY
Y
N
check the 8th pin of U21,
Whether there is more than 11V power supply
Repair the U21 power supply
Whether Volume, MUTE setting is normal
Reset the
setting
U1's 11th and 6th pin Whether there is signal output
YN
Check external
speaker
N
Y
Repair D47 or R257,
And whether Q28 damage
Check the 50th, 51th pin of U14,wheath have signal output
YN
YN
Whether U14 haw signal input Check the circuit from U14 to U21
五
五五
五、
、、
、Audio Trouble
Audio TroubleAudio Trouble
Audio Trouble（
（（
（no sound
no soundno sound
no sound）
））
）

TV NO scan or no picture
六
六六
六、
、、
、Function Trouble
Function TroubleFunction Trouble
Function Trouble（
（（
（TV video
TV videoTV video
TV video）
））
）
whether the external input signal is normal?
N
repair external RF equipment
Y
check the 7
th
pin of t1,whether it is 5V
Repair this
pin power
net
YN
whether the 4
th
,5
th
pin of T1 has data of I
2
C
N
Y
whether the 8
th
pin of T1 has signal?
N
check the network
between U14 and TSUMV26KE
or network between U14
And TV pins or 33v Boost Circuit
Y
whether the 2th pin of T1
has the voltage(1.8V~4.3V)
Repair this circuit
NY
T1 damage Check I2C net
(pin68,pin69)

TV no sound but has pictures
whether it has sound ? when using PC
NY
Look the “NO audio” repair Process
Whether the 1th, 2th pins of SAW1 have signal?
1. SAW1 damage
2. The circuit from SAW1 to U14 is not normal
3. U14 damage
Check the network
between the 2th pin of
SAW1 and tuner
Y N
七
七七
七、
、、
、Function Trouble
Function TroubleFunction Trouble
Function Trouble（
（（
（TV audio
TV audioTV audio
TV audio）
））
）

Under PC channel
Picture is not center Low color,
color cast Image Stabilization No signal
execute auto
adjust commands
whether R.G.B input signal
of U14 is normal?
Reset
the DDC settings
Y N
Check
R.G.B circuit
Whether VS,HS signal are
Ruled and stable?
Check the circuit of VS, HS
OSD settings do
not match,
Reset the OSD or
input mode
not supply
Check the circuit
Of VS, HS
Y N
八
八八
八、
、、
、Function Trouble
Function TroubleFunction Trouble
Function Trouble（
（（
（PC
PCPC
PC）
））
）