Daewoo DLX-20J1BHS User manual

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.
Service Manual
20" LCD TV
CHASSIS :
Model :
S/M NO. : DSL130XEF0
SL-130X
DLX-20J1BHS
OCT. 2006

Contents
I. Parts with the exception of MODULE
1. Safety Precaution 3
2. Product Specification 4
3. Block Diagram 5
4. Description of video circuit 8
5. Schematic Diagram 9
6. PCB Data 15
7. Trouble Shooting 17
8. Service Part List 25
8-1 Service Part List 25
9. Power 30
10. Inverter 31
11. Exploded View 33
11-1 DLX-20J1 33
SOFTWARE INSTALL & UPGRADE
-2-

-3-
1. Safety Precautions
(1) When moving or laying down a LCD Set, at least two people must work together. Avoid any
impact towards the LCD Set.
(2) 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.
(3) When opening the BACK COVER, you must turn off power (AC) to prevent any electric
shock.
(4) 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.
(5) A LCD Set contains different kinds of connector cables. When connecting or disconnecting
cables, check the direction and position of the cable beforehand.
(6) 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.
(7) 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.

-4-
2. Product Specification

-5-
3. Block Diagram

-6-
Block Diagram
LCD_ON
LCD_ON
ON_OFF
ON_OFF
ON_OFF
+5V_PANEL
+5V_SW
+9V_SW +3V3S_SW
+1V8_SW
15V_SW
+8V_SW
+12V_PANEL
33V_TU
15V
5V
S/B_3V3
9V
10 9
GND GND
87 543216
I820
IRF7316
20"AUO
PANEL
I801
IRF7316
I801
IRF7316
I851
APW1172
I809
AP1117E18
I803
AP1117E33 I401
LA42032
I501
LOC-1 (TDA15501E)
I502
24LC32A
I820
IRF7316
I820
IRF7316
I816
LM317 ADJ
12V
I852
KIA78L08F
8V
I503
SST39VF
020
I508
DTC34LF
86
20"LG
PANEL
U100
RF TUNER
U100
RF TUNER
I405
PI5V330
I504
TDA9178T
I807
BA6161
LG PANEL
OPTION

-7-
Block Diagram

-8-
4.Description of Video Circuit
SL-130X video circuit:
Process input signals <Analog-TV signal,CVBS(NTSC),Y/C Signal> to produce Output signal
for LCD panel.(J1/D7 : 640 x 480 , W2 : 1366 x 768)
Introduction for main IC
4-1. I501(TDA15521E)
The LCD One Chip 1(LOC 1)series combines the functionsof a Video Signal
Processor(VSP) together with aFLASH embedded main microcontroller(doing TEXT and
TV control)and an LCD
panel controller.In addition the following functions are available:
-Adaptive digital(4H/2H)PAL/NTSC comb filter
-Teletext decoder with 10 page text memory
-Multi-standard stereo decoder
Microconroller
-80C51 microcontroller core standard instruction set and timing
-256k x 8bit program ROM
-8k x 8bitauxiliary RAM
-8bit ADC with 4 multiplexed inputs.
-I2C byte level bus interface

5. Schematic Diagram
-9-

Schematic Diagram
-10-

Schematic Diagram
-11-

Schematic Diagram
-12-

Schematic Diagram
-13-

Schematic Diagram
-14-

6. PCB Data
-15-
TOP

PCB Data
-16-
BOTTOM

-17-
7. Trouble Shooting
* Facts you must know at trouble diagnosis or repairing
(1) The trouble diagnosis and repairing of set means Module .
In other words, find out which PCB modules are not working and replace them with normal
PCB modules.
(2) This TROUBLE SHOOTING list only contains representative and simple PCB trouble
diagnosis and Module Exchange method. Therefore, if you find Sets which are difficult to
diagnose or to repair, contact Daewoo Electronics.
(3) Basic TROUBLE SHOOTING procedure :
Check Trouble Symptoms Detach Back Cover Trouble Diagnosis Replace broken
PCB module Heat-run (for at least 30 minutes, input Test pattern full white) Adjust
white balance Function Check Repair Complete.
(4) Required equipments for trouble diagnosis
- Digital Multi-meter (measure Dc voltage, measure Diode Voltage, Short-Open test)
- Screwdriver (or electric screwdriver), plastic adjusting tool
(5) Before assemble/disassemble PCBs, check to see if AC Switch is OFF.
(6) After Back cover is closed, redo Heat-run for at least one hour by inputting Full white
pattern.
Symptoms of LIPS, power, inverter, panel Trouble
<Symptom.1> Not even weak discharge (luminescence) shows on screen.
<Symptom.2> Discharge (luminescence) on screen is unstable
<Symptom.3> Set is producing unusual noise
Symptoms of VIDEO or JACK PCB Trouble
<Symptom.1> Only weak discharge (luminescence) shows on screen, but No Data is on
screen
<Symptom.2> Screen DATA is abnormal
<Symptom.3> Particular input signal (Video, etc.) does not operate
<Symptom.4> No SOUND
<Symptom.5> Remote Control or KEY does not operate

-18-
Trouble Shooting
7-1. When LED doesn’t lit.
Is the AC power cord
correctly connected?
Is power S/W ON?
Is output voltage of
Power module correct?
(or LIPS)
Confirm power cord
connection.
Confirm Power S/W ON.
Check the power connection.
Exchange the power module.
Check start
Y
N
N
N
Y
Y
Y
Check the Main PCB.

-19-
Trouble Shooting
7-2. When TV doesn’t turn on in red LED.
Does TV turn on
pushing the CH key?
Check the power connection.
Exchange the Power module.
Confirm Power S/W ON.
Check the connection to IR PCB.
Check the operation of Remote
Controller.
Check start
Y
N
N
Y
Is output voltage of
Power module correct?
(or LIPS)
Y
7-3. When “white screen”.
Is R751,J301(BOE,AUO)
R752,J302 are normal? Check the Main PCB
Check start
Y
N
Y
Is P902(TTL) correctly
connected?
Check the connection
Of Panel
N
Y
Check the connector or Main PCB

-20-
Trouble Shooting
7-4. When “No picture”in TV mode.
Does raster appear?
Does LED turn on in GREEN?
Does auto - tuning
Function operate
normally?
Go to chap 7 - 2
Check start
Y
N
N
N
Y
Y
Y
Tune the channel
Check the tuner
Is this weak discharge
On the screen?
Is input of YUV normal?
(I501, A15, B14, B15)
Is input of RGB normal?
(R203, R207, R211)
Confirm AC connection.
Confirm Power SW ON.
Check the power,
Inverter and panel
Check I504
Check RA80,81,82
N
N
N
Check I402
N
Y
Y
Y
Is input of sync normal?
(I501, Y1, Y2)
Y
Check I501