Service Manuals, User Guides, Schematic Diagrams or docs for : . Various CHINA TV LCD Changhong Chassis LS02 AX3268 Changhong+LS02-AX32-68
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LCD COLOUR TV
SERVICE MANUAL
CHASSIS NO.: LS02(AX32/68)
Please read this manual carefully before service.
1
Catalog
Chapter 1: Specifications and Composition ...................................................................................... 3
Chapter 2: Function Introduction of Main IC..................................................................................... 6
Chapter 3: Analysis of Signal process Flowchart and key point measure date ........................ 28
Chapter 4: Maintenance Procedure and Examples of Typical troubleshooting......................... 37
Chapter 5: Spare Part Lists .................................................................................................................. 38
Chapter 6: Factory Setup and notice .................................................................................................. 40
Appendix AX32/68module Circuit Schematic Diagram............................................................... 44
2
Chapter 1: Specifications and Composition
1. Models for LS02 chassis :
Region Europe America Other regions
01:26",32",37",42" 01:26",32",37",42" 01:26",32",37",42"
19:32",42",46" 19:32",42",46" 19:32",42",46"
25:32",37",42" 25:32",37",42" 25:32",37",42"
Original 29: 26",32",37",42" 29: 26",32",37",42" 29: 26",32",37",42"
Models 30: 26",32",37",42" 30: 26",32",37",42" 30: 26",32",37",42"
700: 26",32",37",42" 700: 26",32",37",42" 700: 26",32",37",42"
218: 26",32",37",42" 218: 26",32",37",42" 218: 26",32",37",42"
528: 26",32",37",42" 528: 26",32",37",42" 528: 26",32",37",42"
2. Main Feature
Region Europe America Other regions
Color
PALSECAM NTSCPAL MPAL N PALNTSCSECAM
system
RF signal
Sound
D/KB/GIL/L' M D/KB/GIM
system
Video or Y/C signal PALNTSCSECAM PALNTSCSECAM PALNTSCSECAM
68 AIR2-69
Program presetting 100 0-99 236 0-235
125 CABLE1-125
Audio outputTHD
5W+5W 5W+5W 5W+5W
7%
Power source 100V240V 100V240V 100V240V
Teletxt 2000 pages X 2000 pages
CCD X Yes X
Sound demodulator NICAMIGR BTSC NICAMIGR
SCART Yes X X
VGA Yes Yes Yes
YPbPr Yes Yes Yes
HDMI Yes Yes Yes
Earphone Yes Yes Yes
English, French, German, English, French, English, French, German,
OSD language
Italian, Portuguese etc. Portuguese, Spanish etc. Spanish etc.
Auto Off without Signal
5 minutes
Reception
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.
LCD TV could be used as computer screen, no need for the installation of software,
Plug and Play
which is Plug and Play in real sense
3. Unit IC Compositions
LCD TV with LS02 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:
3
RS232 IR_Key 12V 5V
E2PROM Flash
AMP
I/O
Speaker
8Mx16DDR IF
LVDS
SVP_AX32 TUNER
TV-CVBS,SIF
PS301 V1,RGB,FS1,FB1,Vout1
D_Port
Y C,FS2 Lin1/Rin1 Lo1/Ro1
Lin2/Rin2 Lo2/R02
Y C
Y1Pb1Pr1
19 1
VGA Y1Pb1PR1/L3R3 S-Video SCART2 SCART1
HDMI
Headphone
V3 L3 R3
EU Model S_Video
Y1 Pb1 Pb1
V3 L3 R3 V2 L2 R2 V1 L1 R1
S_Video
CHN Model
Y1 Pb1 Pb1 Y2 Pb2 Pr2 VO1 LO1 RO1
4
4. Introduction of PCB module
LCD TV with LS02 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
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
Mainboard signal, controls the Video (brightness, contrast, chroma, hue, definition etc),
1
module 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.
The remote reception board module is constituted by an indicator-light and a
Remote
remote reception. Customer could manipulate the LCD TV by using remote
2 reception
controller very conveniently. By the color of the indicator light, the operation
module
mode of the LCD TV could be judged (red is standby, green is power on).
Built-in power Convert the 100V240V 50/60HZAC into DC, output have +12V, +5V,
3
board module +3.3V and the +5V_STB in standby state.
Keyboard Keyboard module has 7 function keys (program +/-, volume +/-, AV/TV,
4
module menu ,power), customer could use the key to operate the TV freely.
LCD screen has built-in inverter that convert DC into high voltage AC signal to
LCD screen
5 turn on the backlight CCFL (Cold Cathode Fluorescent Light); the LCD screen
module
process the video signal from signal board and reappear.
Side AV
6 Side AV board is used for earphone output.
board
5
Chapter 2: Function Introduction of Main IC
1. Main ICs and functional modules of LS01 chassis
No. Item no. Model Main function
1 U8 AFT7/W000 Tuner output sound IF and video signal
2 U1 SVP-AX32LF Video decoder, image processor, A/D and D/A
conversion
3 U3 AT24C64-SO8-DNS EEPROM
4 U5 W25X80-VSSIG 8M-bit Serial Flash, Store the Control program.
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