Daewoo DSL-20D3 User manual

SERVICE MANUAL
LCD Television
CHASSIS : SL-110P
Model : DSL-20D3
APR. 2005

Contents
I. Parts with the exception of MODULE
1. Safety Precaution 3
2. Product Specification 4
3. Block Diagram 7
3-1 PCB Structure
3-2 Power ree
3-3 Signal Block Diagram
4. Description of video circuit 10
5. Schematic Diagram 20
6. SL-110P Service Data 29
7. Service Part List 36
7-1 Difference List of SL-110P 43
8. Adapter 44
9. Inverter 45
10. Exploded View 47
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1. Safety Precautions
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 Picture 1-1. Panel Gas Exhaust ube
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.

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2. Product Specification
ModelDSL-20D3
CHASSIS NOSL-110P
CountryEurope
Remote controllerR-47B02
LCD Panel LCD ypeN (AIO)
Screen Size)20” (50.8 )
Aspect Ratio4 : 3
Resolution800 600 (SVGA)
Pixel Pitch0.51 0.51
Brightness500 cd/
Contrast ratio500 : 1
Viewing Angle (U/D/R/L) 60 / 60/ 80 / 80
Response ime16
V System Color SystemPAL / SECAM
Receiving SystemPAL B/G, I/I’, D/K, L-SECAM,
L’-SECAM
uning MethodFVS
unerPA BF19D (PAR SNIC)
VHF :
BAND : CH2 ~ CH4
BAND : CH5 ~ CH12
Reception ChannelCABLE BAND : S1’ ~ S3’,
S1 ~ S20
UHF :
HYPER BAND : S21 ~ S41
BAND , : CH21 ~ CH69
PIF :
38.9 (B/G, D/K, I/i’, L),
34.2 (L )
SIF :
33.4 (B/G), 32.4 (D/K, L),
32.9 (I/I’), 41.0 (L’)
IF & SubCarierS-subcarrier :
5.5 / 5.85 (NICAM) /
5.74 (2-Carrier)
Color-subcarrier :
4.43 (PAL), 4.25 /
4.40625 (SECAM)
Audio SystemMono / Stereo / Dual
Channel Memory99 Channel, Auto Preset
Input V Input75 Ohm external input terminal
(DIN Standard)
A/V (R,G,B / COMPOSI E) Scart Jack 1
S-Video Input S-VHS (Y/C) 1
COMPOSI E
Video / Audio(N SC, PAL, SECAM, N SC4.43)
RCA Jack 1, Audio L/R 1
COMPONEN
Component / Audio(Y, Pb/Cb, Pr/Cr, 480i ~ 1080i)
RCA Jack 1
Audio L/R 1
PC InputVGA ~ SVGA
15Pin D-SUB Jack 1
PC Audio Input Stereo Jack 1
Output Video / Audio Scart Jack 1
Headphone 3.5 Mini Stereo Jack 1
2-1. SPECIFICATION

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Product Specification
Other FeaturesComb Filter2D
C I
L I
OSD17 Languages
ELE EX 10 Page memory OP / FLOF
Audio Output5W (2.5+2.5W)
(10% HD, 60%MOD at 1kHZ)
Speaker 5 2
Aspect ratio control16 : 9 / ZOOM
Auto Power off
Wake up
Sleep time15/30/45/60/90/120 min
Wall mount holeVESA compatible
Power Consumption
Max50 W
Stand-by3W under
Power supplyDC 15V
External Adaptor
Power SourceAC 100-240V
50 / 60
Dimension (W H D)
Set dimension (with Stand)(608 403 215)
ilt (Front / Back)5” / 15”
Weight (with Stand)10.95
USER CON ROL & ACCESSORIES POWER V/VIDEO MENU
Control Button (Set) VOL. DOWN VOL. UP
PR. DOWN(On) PR. UP(On)
Remote Controller (32keys) POWER MU E PR. UP
PR. DOWN VOL. UP
VOL. DOWN MENU
NORMAL RED GREEN
YELLOW CYAN ELE EX
SLEEP ASPEC PC
V/AV S.MODE RECALL
X keys 0 ~ 9 Digit keys
Instruction AC Adapter
Accessories AC Power Remote Controller
Battery (AAA 2)

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Product Specification
Stamdard Resolution (Mode) V Frequency (Hz) H frequency (KHz) 15 inch 17 inch 20inch
MAC 640 480 66 35
832 624 75 49.73
2-2. Available Input Signal
(1) PC input
(2) Component input
- 480i/ 60 Hz
- 480p / 60 Hz
- 576i / 50 Hz
- 576p / 50 Hz
- 720p / 60 Hz
- 1080i / 50 Hz
- 1080i / 60 Hz
(3) Video input
- N SC-M/4.43
- PAL / SECAM

7

8

9
SOUN
ADC
MST9883
(IC16)
SAW
FILTER
TV
RF TUNER
SOUND PROCESSOR
IF
PROCESS
VIDEO
DECOD
-ER
MICOM
TTX&
CAPTION VIDEO
BACK
END
DISPLAY
DECODER EEPROM
24LC16(IC31)
S-VIDEO Input
S-VHS (JP5)
SCART(JP11)
(Only Europe)
Video Input
RCA (JP8)
SW IC
4052
(IC2)
SDRAM
IS42S3200B-6T
(IC23)
FLASH
SST39VF800A
(IC11)
SCALER
PW113 (IC13)
G
P
O
R
T
V
P
O
R
T
D
P
O
R
T
PIXEL
PROCE-
SSOR
SCALER
& CLT
& OSD
COLOR
SPACE
EXPAND
-ER
De-interlacer
MDIN-150 (IC22)
C
S
C
C
S
C
De-
interlace
processo r
LOGIC IC
74LV273 (IC40)
SW IC
PI5V330
(IC34)
SW IC
PI5V330
(IC9)
SW IC
PI5V330
(IC5)
SW IC
4052
(IC33)
MICOM EEPROM
24LC16 (IC38)
LVDS
EL-LV385
(IC7)
INVERTER
SCL1 SDA1
IR
KEY
TXD
TV (RGB)
TV (HV)
MAIN (L,R)
H.P (L,R)
SCL1 SDA1
CVBS
Y/C
RGB, CVBS
RXD SCL2
GHS
GCLK
GCOAST
SCL2
SDA2
L, R
L, R G COAST PC(RGB) 24bit
SCART
AUDIO
AVAUDIO
COMP1 AUDIO
SW
PC AUDIO
PC(HV)
TV (HV)
PC (RGB)
COMP1 (YPbPr)
TV (RGB)
MAIN IC VCTI
(IC29)
COMP2 AUDIO
COMP2 (YPbPr) SW
SW
SWSW
MAIN (R)
MAIN (L)
H.P (L,R)
SOUND AMP
TDA1517 (IC30)
SOUND AMP
TDA1517 (IC25)
SPEAKER
SPEAKER
H- PHONE
SCL2 SDA2
RXD
CXA1315
(IC26) SOUND MUTE
SCL1
SDA1
GVS
GHS
TV
(RGB),
COMP
(YPbPr),
24bit
GCLK
TXD
GVS
SCL1
SDA1
RGB
24bit
VHS
VVS
VCLK
SCL2
SDA2
SDA2
RGB
24bit
DHS
DVS
DCLK
LCD ON
Dimming 4-Lamp
cable
(15"/ 17")
6- Lamp
cable (20" )
RGB
DATA
8bit
CLK 2bit
TO LCD
MODULE
15inch : XGA (S/S)
17inch : WXGA (S/S)
SDRAM Interface
3-3. SIGNAL BLOCK DIAGRAM
SW
(5- Line)
D AMP
KA4558 (IC36)
L : PC
H : TV/COMP1,2
L : COMP1,2
H : TV
L : COMP2
H : COMP1
TV/COMP ADC SEL MODE
L L PC
L H X
H L X
H H AV
A_SEL0 A_SEL1 MODE
L L COMP1
L H PC
H L COMP2
H H AV

4. Description of video circuit
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SL-110P video circuit :
Process various input signals <Analog-TV signal, CVBS(NTSC), Y/C signal, Component
signal(Y-Pb-Pr 1080i, 720P, 480P, 480i), Analog-PC signal> to produce Output Signal for LCD
panel(15” : 1024 768, 17” : 1280 768, 20” : 800 600).
Introduction for main IC
4-1. IC29 (The VCT 49xxI)
: IC family of high-quality single chip TV processors <DRX, MSP, VSP, DDP and SDA>

Description of video circuit
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1) DRX
Overview of DRX
The Digital Receiver Front-end (DRX) performs the entire multi-standard Quasi Split Sound
(QSS) TV IF processing, AGC, video demodulation, and generation of the second sound IF
(SIF) requiring only one SAW filter.
All control functions and status registers are accessible via I2C bus interface. Therefore, it
simplifies the design of high-quality, highly standardized IF stages.
For pre-filtering, one 8-MHz channel SAW filter must be used.
TV signal Ë Tuner(TU1) Ë SAW-filter(S3) Ë 72 & 73 pin of VCTI(IC 29) Ë DRX of VCTI
Features
- Multi-standard QSS IF processing with a single SAW
- Programmable IF frequency (38.9 MHz, 45.75 MHz, 32.9 MHz, 36.125 MHz, 58.75 MHz.)
- Digital IF processing for the following standards: B/G, D/K, I, L/L’, and M/N
- Standard specific digital post filtering
- Standard specific digital video/audio splitting
- Standard-specific digital AGC and delayed tuner AGC with programmable tuner Take Over
Point
- Second SIF output with standard dependent pre-filtering and amplitude controlled output level
- Video demodulation
- Second SIF generation and AGC
Output of DRX : CVBS & SIF

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Description of video circuit
2) MSP
Overview of MSP
The MSP receives the digital Sound IF signal from the DRX part.
The MSP is able to demodulate all TV sound standards worldwide including the digital NICAM
system.
INPUT :
SIF(DRX) MSP of VCTI
Audio signal(External device) CD4052(IC33, Switching) 78&79 pin of VCTI(IC29) MSP
of VCTI
OUTPUT :
84 & 85 of VCTI TDA1517(IC25 & IC30)
Features
Sound Demodulator:
- worldwide FM/AM-mono demodulation
- FM carrier based demodulation (A2, EIA-J)
- FM stereo radio & RDS demodulation
- Nicam demodulation
- BTSC/SAP with MNR (DBX optional)
- automatic standard detection
- automatic sound select
Audio processing for loudspeaker channel:
- volume
- automatic volume correction (AVC)
- bass & treble or equalizer
- loudness
- balance
- spatial effect (e.g. pseudo stereo)

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Description of video circuit
3) VSP
Overview of VSP
INPUT :
CVBS(DRX) VSP of VCTI
Video signal(External device) 51& 52 & 53 pin of VCTI(IC29) VSP of VCTI
OUTPUT :
YUV(4:2:2 or 4:4:4)
Features
- multi-standard color decoder PAL/NTSC/SECAM including all substandards
- macro-vision compliant multi-standard sync processing
- macro-vision detection
- letterbox detector (auto-wide)
- 1H delay line (PAL compensation,NTSC combfilter)
- 4H adaptive comb filter (PAL/NTSC)
- vertical peaking (via comb filter)
- linear horizontal scaling (0.25 to 4)
- nonlinear horizontal scaling “panorama vision”
- peaking, contrast, brightness, color saturation and tint for all inputs (CVBS, S-VHS, YCrCb
and RGB)
- panorama scaler for all inputs (CVBS, S-VHS, YCrCb and RGB)

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Description of video circuit
4) DDP
Overview of DDP
The DDP contains the entire digital video component and deflection processing, as well as all
analog interfaces to display the picture on a CRT
INPUT :
YUV(4:4:4 , VSP) DDP of VCTI
OUTPUT :
16& 17 & 18 pin of VCTI(IC29) TV_RGB signal
Features
Display processing
- dynamic contrast improvement (DCI)
- dynamic black level expander (BLE)
- luma sharpness enhancement (LSE)
- color transient improvement (CTI)
- brightness, contrast, saturation and tint
- programmable YCrCb to RGB matrix
- static black stretch, blue stretch, gamma correction by a programmable Non-linear Colorspace
Enhancer (NCE) on RGB
Deflection Processing
- vertical sawtooth (amplitude, linearity, s-correction, zoom)
- dynamic horizontal EHT (amplitude/phase compensation with Tc ~ 1line)
- vertical angle and bow correction
- horizontal and vertical protection circuit
- soft start/stop of H-drive
- supports horizontal and vertical dynamic focus
Backend Features
- internal analog OSD (RGB/FB/COR) input
- fast-blank priority & monitoring via I2C

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Description of video circuit
5) TVT
Overview of TVT
TVT of VCTI UART PW113(IC13)
The TVT is a Teletext decoder for decoding World System Teletext data, as well as Video
Programming System (VPS), Program Delivery Control (PDC), and Wide-Screen Signalling
(WSS) data used for PALplus transmissions.
The device also supports Closed Caption acquisition and decoding.
The TVT provides an integrated general-purpose, fully 8051-compatible microcontroller with
television-specific hardware features.
The on-chip display unit for displaying Level 1.5 Teletext data can also be used for customer-
defined onscreen displays.
Features
Controller Features
- 8-bit 8051 instruction set compatible CPU
- Watchdog timer
- UART
- Real time clock (RTC)
- I2C bus master/slave interface
OSD Features
- 24 kB on-chip character ROM
- Supports all East and West European languages
- National language support (Latin, Cyrillic, Greek, Arabic, Farsi, Hebrew)
- Mosaic graphic character Set
Teletext Features
- Multi-standard digital data slicer
- Full field and VBI data acquisition
- Simultaneous WST, PDC, VPS, and WSS acquisition
- Closed Caption and V-chip acquisition

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Description of video circuit
4-2. IC25 and IC30 (TDA1517)
: Class-B dual audio amplifier
INPUT :
Audio signal (84 & 85 pin of VCTI) TDA1517
OUTPUT :
Audio signal (TDA1517, amplify) Speaker
4-3. IC16 (MST9883)
: Triple Video A/D Converter with Clamps & Pixel Clock Synthesizer
INPUT :
1-RF, 1-CVBS, 1-Y/C, 2-Component, 1-PC signal PI5V330(IC5,9,34),Switching 43 & 48 &
54 pin of MST9883(IC16)
OUTPUT :
PC signal Gport ofPW113(IC13)
Other signal MDIN150(IC22)
FEATURES OVERVIEW
- Triple ADC with 12 - 140 MHz Sampling Rate
- Integrated line locked PLL generates pixel clock from HSYNC
- 4:2:2 Output Format Mode

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Description of video circuit
4-4. IC22 (MDIN150)
: Single chip of de-interlacing and format conversion.
Interlace signal MDIN150, Progressive signal PW113(IC13)
Main Features
- Performs high quality deinterlacing for arbitrary format of interlaced video input up to 1080i
- Motion adaptive 3-D deinterlacing with pixel-by-pixel motion adaptive interpolation
- High quality edge preserving deinterlacing thru multiple directional edge detection and
interpolation
- Deinterlacing with fast motion detection and processing
- Deinterlacing with motion boundary preservation using previous 30 fields motion history
- Deinterlacing with film mode detection and processing for film source
- Deinterlacing with bad edit and subtitle detection and adaptation for film source
- Independent horizontal and vertical scaling
- Frame rate conversion with arbitrary conversion ratio
- Inter field noise reduction using previous 30 fields motion history
- Programmable high order peaking filter for horizontal edge enhancement
- Color enhancement filter for smooth color component output
- Programmable brightness, contrast, tint, saturation and gamma control

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Description of video circuit
“rocess MDIN output signal to produce Signal for LCD panel(15”± : 1024*768, 17”± : 1280*768,
20”± : 800*600 ).
Control :
MST9883 and MDIN < I2C >
74LV273A(IC40) <Digital port> Switching IC
Features
- ITU-R 656 Video Interface
- 2nd Generation Horizontal and Vertical Image Scaling
- Pixel Rate Conversion
- Multi-Region Non-Linear Scaling
- ITU-R 656 Video Interface
- Video Processing
- Advanced OSD Support
- On-Chip 80186 Microprocessor

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Description of video circuit
4-6. IC17 (EL-LV385)
: LVDS Transmitter 24-Bit Flat Panel Display (FPD) Link-85 MHz
Output signal of PW113 LV385 (Converting LVDS signal) LCD panel
EL-LV385 Transmitter converts parallel 28bits CMOS/TTL data to serial LVDS(Low Voltage
Differential Signaling)
4-7. IC9 and IC34 (PI5V330)
: Quad 2-channel Mux / DeMux, switching IC
4-8. IC2 and IC33 (4052)
: Dual 4-channel Analog Multiplexer, audio and sync signal switching IC

20