A-Star ud55yc5500ua User manual

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LCD COLOUR TV
SERVICE MANUAL
CHASSIS NO.: LS01
Please read this manual carefully before service.

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Catalog
Chapter1 Specifications and Composition.......................................................3
Chapter2 Function Introduction of Main IC ...................................................7
Chapter3 Analysis of Signal process Flowchart and key point
measure date....................................................................................................29
Chapter4 Maintenance Procedure and Examples of Typical
troubleshooting..............................................................................................39
Chapter5 Spare Part Lists.............................................................................................40
Chapter6 Factory Setup and notice......................................................................41
Appendix: 1. Circuit Schematic diagram
2. Circuit Schematic diagram of power module
3. Final Assembly diagram
4. Wiring diagram of LCD TV with LS01 chassis (take LT32GJ01E
as an example)

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Chapter 1: Specifications and Composition
1. Models for LS01 chassis :
Region Europe America Other regions
Original
Models
LT26GJ01E LT32GJ01E
LT37GJ01E LT26GJ12E
LT32GJ12E LT37GJ12E
LT26GJ88E LT32GJ88E
LT37GJ88E
LT26GJ01U LT32GJ01U
LT37GJ01U LT26GJ12U
LT32GJ12U LT37GJ12U
LT26GJ88U LT32GJ88U
LT37GJ88U
LT26GJ01A LT32GJ01A
LT37GJ01A LT26GJ12A
LT32GJ12A LT37GJ12A
LT26GJ88A LT32GJ88A
LT37GJ88A
2. Main Feature
Region Europe America Other regions
Color
system PAL、SECAM NTSC、PAL M、PAL N PAL、NTSC、SECAM
RF signal Sound
system D/K、B/G、I、L/L’ M D/K、B/G、I、M
Video or Y/C signal PAL、NTSC、SECAM PAL、NTSC、SECAM PAL、NTSC、SECAM
Program presetting 100 （0-99）68 （AIR：2-69）
125 CABLE：1-125）236 （0-235）
Audio output（THD≤
7%）5W+5W 5W+5W 5W+5W
Power source 100V～240V 100V～240V 100V～240V
Teletxt 100 pages X 100 pages
CCD X Yes X
Sound demodulator NICAM、IGR BTSC NICAM、IGR
SCART Yes X X
VG A Yes Yes Yes
YP bPr Yes Yes Yes
HDMI Yes Yes Yes
Earphone Yes Yes Yes
OSD language English, French, German,
Italian, Portuguese etc.
English, French,
Portuguese, Spanish etc.
English, French, German,
Spanish etc.
Auto Off without Signal
Reception 5 minutes
Program booking 5 program booking. Turn to the corresponding program at the booking time.
Swap Customer could rearrange the channels according to personal habit
Energy saving system Customer could adjust LCD screen backlight brightness manually to save energy.
Plug and Play LCD TV could be used as computer screen, no need for the installation of software,
which is Plug and Play in real sense
3. Unit IC Compositions：
LCD TV with LS01 chassis is made up of switch power, system control circuit, video
processing circuit, audio processing circuit, Power Amplifier circuit, AV input circuit, LCD screen
module. Block circuit diagram is shown as below:

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1) European market:

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2). American and Asian market:

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4. Introduction of PCB module
LCD TV with LS01 is made up of power board, side AV board, remote control reception
board, key board, and mainboard. The table below is the introduction of the function of all
printed board modules.
No. Parts Description
1 Mainboard
module
Mainboard module is the core of LCD TV signal processing. Under the control
of the system control circuit, It undertakes the task of converting the external
input signal into the unified digital signal that the LCD screen could identify.
Mainboard controls the whole machine through IIC bus, decode VIDEO
signal, controls the Video (brightness, contrast, chroma, hue, definition etc),
white balance adjusts, generates OSD, de-interlaces signal, converts signal
frequency, and finishes signal A/D and D/A conversion, video enhancement,
LVDS signal coding and output; it has Scart , S-Video, AV , YPbPr, HDMI and
PC interface, Tuner input, sound demodulation, sound processing, sound
power amplifier, and online update.
2
Remote
reception
module
The remote reception board module is constituted by an indicator-light and a
remote reception. Customer could manipulate the LCD TV by using remote
controller very conveniently. By the color of the indicator light, the operation
mode of the LCD TV could be judged (red is standby, green is power on).
3 Built-in powe
r
board module
Convert the 100V～240V （50/60HZ）AC into DC, output have +24v, +12V,
+5V, and the +5V_STB in standby state.
4 Keyboard
module
Keyboard module has 7 function keys (program +/-, volume +/-, AV/TV,
menu ,power), customer could use the key to operate the TV freely.
5 LCD screen
module
LCD screen has built-in inverter that convert DC into high voltage AC signal to
turn on the backlight CCFL (Cold Cathode Fluorescent Light); the LCD screen
process the video signal from signal board and reappear.
6 Side AV
board Side AV board is used for earphone output.

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Chapter 2: Function Introduction of Main IC
1. Main ICs and functional modules of LS01 chassis
No. Item no. Model Main function
1 U15 JS-6H2/121 Tuner output sound IF and video signal
2 U1 SVP-CX32LF Video decoder, image processor, A/D and D/A
conversion
3 U2 IS42S32200C1-6TL SDRAM with 2MX32bits
4 U3 AT24C64A-10PU-2.7 EEPROM
5 U4 T5BS4-9999 MCU
6 U5 SST39VF040-70-4C-NHE Flash, Store the Control program.
7 U6 74ALVC573PW Address latch, to latch the address wires
8 U8 TCM809SENB713 Hardware reset IC of MCU
9 U9 74HCT4052D Audio input switch of AV terminal
10 U35 STV-8217/STV-8218 Audio signal processor
11 U14 74LVC14AD VGA line and field synchronizing signal waveform
shaping
12 U16、U25 AT24C02BN-10SU-1.8 EEPROM
14 U18、U22 AZ1117H -1.8TRE1 3.3V to 1.8V DC conversion
16 U19、U24 AZ1117H -3.3TRE1 5V to 3.3V DC conversion
18 U20 AZ1084S -3.3TRE1 5V to 3.3V DC conversion
19 U21 AZ1084S -1.8TRE1 5V to 1.8V DC conversion
20 U23 AZ78L08ZTR-E1 12V to 8V DC conversion
21 U26 CS4344-CZZ HDMI digital audio decode, DAC
22 U28、U29 Rclamp0514M.TBT ESD protection device of HDMI
24 U30 ANX9011L HDMI digital signal decode
25 U31 PI5C3306LE (SDA, SCL) used for program update
26 U33 TDA8944J Audio amplifier (BTL output)
2. Function introduction of ICs or functional module of LCD TV with LS01chassis

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1.Tuner (JS-6H2/121 or CDT-6GPL22-00)
Pin No. Definition of pin Function description
1 NC No connection
2 BT No connection
3 VCC +5V power
4 SCL IIC bus (clock)
5 SDA IIC bus (data)
6 AS Ground
7 AFS Ground
8 NC No connection
9 NC No connection
10 NC No connection
11 SIF/Out Sound intermediate Frequency output
12 Video/Out CVBS signal output
13 VCC（+5V）+5V power
14 Audio/Out Audio signal output
2. Image processing IC SVP-CX32LF
The SVPTMCX video processor is a highly integrated system-on-a-chip device, targeting the
converging HDTVready and PC-ready LCD TV, PDP TV applications where high precision
processing of video and data are the requirements. SVPTMCX contains 6th generation
dual-purposed triple 10-bit high-precision and high speed video ADCs for both PC and video
inputs, the high-performance multi-format 3D digital comb video decoder that supports NTSC,
PAL, and SECAM*, a HDTV sync separator, motion adaptive de-interlacing engine, and the
video format conversion engine, supporting multi-window display in many different output
modes. Trident’s DCReTM – Digital Cinema Reality engine, is integrated inside the SVPTMCX
family to provide the most natural cinema-realistic images. The DCReTM technology integrates
advanced 3D-comb video decoding, advanced motion adaptive de-interlacing, object-based
digital noise reduction, advanced 6th generation scaler, film mode support, average picture
level (APL), edge smoothing and dynamic sharpness enhancement. Trident's patented Unified
Memory Architecture (UMA) that allows frame rate conversion, 3D comb video decoding, and
video enhancement processing to share the same memory buffer that is made up of high-speed
and cost-effective PC graphic memory. All these advanced digital processing techniques
combined with a true 10-bit video data processing for the most optimal video fidelity to provide
the most natural and cinema quality video images. Designed for maximum system design
flexibility, SVPTMCX integrates all video interfaces to support converging digital video, analog
video, and PC data applications. The users of Trident's single chip SVP™CX series video
processor(s) will benefit from many features while maintaining a price competitive advantage
over the existing solution(s)
Main features:
●Integrated 6th Generation Motion and Edge Adaptive De-interlacing
●Integrated ADC
●PC auto tune
●Built-in 8-bit LVDS Transmitter
●6th generation cubic-4 image scaling engine
●Advanced Chroma Processing and Dynamic Contrast Function

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●Green color stretch, blue color stretch, skin color enhancement
●Integrated 6th Generation Motion Adaptive 3D Digital Comb Video Decoder with
Programmable Filter
●60Hz～100Hz interlaced scanning and 50Hz～75Hz progressive scanning
●frame rate conversion
●14D：dynamic picture enhancements
●Advanced Film Mode Recovery-3:2/2:2 pull down
●Build-in A/D conversion function
●Teletext function
●Supports 16/32bits SDRAM memory interface
●Multi-screen display mode
●OSD and VBI/Closed caption and advanced OSD engine
Pin function description:
Pin No. Designation of pin Function of pin
Analog signal input/output terminal
169 CVBS1 CVBS input 1
180 Y_G1 Y input
181 Y_G2 SCART1 Green signal input
182 Y_G3 S-Video Y signal input
183 PC_G PC Green signal input
188 PR_R1 DVD interface Pr signal input
189 PR_R2 SCART1 Red signal input
190 PR_R3 SCART2 Y signal input
191 PC_R PC Red signal input
192 C S-Video C signal input
196 PB_B1 DVD interface Pb signal input
197 PB_B2 SCART1 Blue signal input
198 PB_B3 SCART1 CVBS signal input
199 PC_B PC blue signal input
171 FS1 No connection
170 FS2 No connection
173 FB1 SCART1 RGB_FB signal input
172 FB2 SCART2 chroma signal input
174 VREFP_1 A/D conversion1 voltage reference +
175 VREFN_1 A/D conversion 1 voltage reference -
184 VREFP_2 A/D conversion 2 voltage reference +
185 VREFN_1 A/D conversion 2 voltage reference -
Digital signal terminal
37 DP0
┆┆
29 DP8
26 DP9
25 DP10
Digital signal I/O（DP0~DP23）interface

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24 DP11
22 DP12
21 DP13
18 DP14
┆┆
14 DP18
11 DP19
┆┆
7 DP23
CPU control terminal
55 PWMO Pulse width modulation input
57 SCL IIC（clock）
58 SDA IIC（data）
60 GPIO0 GPIO1 selection signal
59 GPIO1 GPIO2 selection signal
62 WR# CPU write signal
63 RD# CPU read signal
61 CS CPU chip selection signal（low level effective）
56 INTN Interrupt signal（low level effective）
84 ALE Address latch signal
86 RESET Reset signal (high level effective)
85 V5SF
SF Power（+5V）
4 DP_HS Line synchronization signal
5 DP_VS Field synchronization signal
23 DP_CLK Digital port Clock
6 DP_DE_FLD DE I/O terminal
64 ADDR0
┆┆
71 ADDR7
CPU address（R0~R7）signal
83 A_D0
┆┆
76 A_D7
CPU address/data passage
MISC port control signal
162 CVBS_OUT2 SCART2 interface CVBS signal output
163 CVBS_OUT1 SCART1 interface CVBS signal output
157 TEST MODE Test mode signal (grounding)
158 AIN_HS Line synchronization signal
159 AIN_VS Field synchronization signal
205 XTALI
204 XTALO
Crystal oscillator interface
SDRM 控制端口
124 MA0
┆┆
Memory address （A0~A11）