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LTA-32N658HCP
LTA-32N680HCP
LTC-26N680HCP
LTC-32N680HCP
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LCD COLOUR TV
SERVICE MANUAL
MODEL:
LTC-26N680HCP
LTC-32N680HCP
LTA-32N680HCP
LTA-32N658HCP
CHASSIS NO.: LS02/PS02
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Please read this manual carefully before service.
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Catalog
Chapter1
U Specifications and Composition ...................................................... 4
U
Chapter2
U Function Introduction of Main IC U .................................................... 7
Chapter3
U Analysis of Signal process Flowchart and key point
measure date .................................................................................................... 31
U
Chapter4 Maintenance Procedure and Examples of Typical
U
troubleshooting .............................................................................................. 40
U
Chapter5
U Spare Part Lists ............................................................................................. 42
U
Chapter6
U Factory Setup and notice ...................................................................... 43
U
Appendix: Circuit Schematic diagram
3
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Chapter 1:
0B Specifications and Composition
1. Models for LS02/PS02 chassis :
Region Europe America Other regions
LT26GHxxE LT37GHxxE LT26GHxxU LT37GHxxU LT26GHxxA LT37GHxxA
LT32GHxxE LT42GHxxE LT32GHxxU LT42GHxxU LT32GHxxA LT42GHxxA
LT47GHxxE LT47GHxxU LT47GHxxA
Original
xx:01,19,29,30,41 etc. xx:01,19,29,30,41 etc. xx:01,19,29,30,41 etc.
Models
PT32GHxxE PT42GHxxE PT32GHxxU PT42GHxxU PT32GHxxA T42GHxxA
PT50GHxxE PT50GHxxU PT50GHxxA
xx:218,528,26,18,36 xx:218,528,26,18,36 xx:218,528,26,18,36
2. Main Feature
Region Europe America Other regions
RF Color system PALSECAM NTSCPAL M/ N PALNTSCSECAM
signal Sound system D/KB/GIL/L' M/N D/KB/GIM
Video or Y/C signal PALNTSCSECAM PALNTSCSECAM PALNTSCSECAM
181 AIR 2-69 CABLE
Program presetting 100 0-235 236 0-235
1-125
Audio outputTHD7% 5W+5W 5W+5W 5W+5W
Power source 100V240V 100V240V 100V240V
Teletxt 100 pages X 100 pages
CCD X Yes X
VCHIP 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,
English, French, English, French, German,
OSD language German, Italian,
Portuguese, Spanish etc. Spanish etc.
Portuguese 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
LCD TV could be used as computer screen, no need for the installation of
Plug and Play
software, which is Plug and Play in real sense
3. Unit IC Compositions
LCD TV with LS02/PS02 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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RS232 IR_Key 12V 5V
E2PROM Flash
Speaker
AMP
I/O
8Mx16DDR IF
LVDS
SVP_AX32 TUNER
TV-CVBS,SIF
D_Port
PS301 V1,RGB,FS1,FB1,Vout1
Y C,FS2 Lin1/Rin1 Lo1/Ro1
Y1Pb1Pr1
Lin2/Rin2 Lo2/R02
Y C
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
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4. Introduction of PCB module
LCD TV with LS02/PS02 Chassis 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
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Chapter 2: Function Introduction of Main IC
1. Main ICs and functional modules of LS02/PS02 chassis
No. Item no. Model Main function
AFT7/W003
1 U8 AFT7/W103 Tuner,output sound IF and video signal
AFT7/W300
SVP AX family video processors provide the
highest performance, target the converging
HDTV-ready and PC-ready LCD TV, PDP TV
2 U1 SVP-AX32LF/SVP-AX68LF applications where high precession processing of
video, which Embed in ADC converter 3D comb
filter HDMI processor video decoder LVDS
transmitter etc.
3 U3 AT24C64-SO8-DNS EEPROM
4 U5 W25X80-VSSIG 8M-bit Serial Flash, Store the Control program.
5 U7 HY5DU281622FTP-4 8M