Akira LCT-17CHST Schematic

LCD TV
Service Manual
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MODEL:
LCT-17CHST
CHASSIS
INFO: LS-07
Model No.: LCT17CHST. doc Version: 1.0
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CONTENTS
SAFETY PRECAUTION .............................................................................................................4
MAIN FEATURE .........................................................................................................................6
ELECTRIC CIRCUIT ..................................................................................................................9
MAIN ICs FUNCTION...............................................................................................................10
SYMPTOMS & CORRECTION ................................................................................................24
LIST OF BREAKABLE & MAINTENANCE PARTS ..................................................................25
FACTORY MODE .....................................................................................................................26
EXPLODED VIEW....................................................................................................................27
WIRING DIAGRAM...................................................................................................................28
CIRCUIT DIAGRAM .................................................................................................................29
WALL-MOUNTING BRACKET INSTALLATION GUIDE ..........................................................36
Model No.: LCT17CHST. doc Version: 1.0
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IMPORTANT SAFETY PRECAUTION
Model No.: LCT17CHST. doc Version: 1.0
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Model No.: LCT17CHST. doc Version: 1.0
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MAIN FEATURE
RF input ,CATV function
Capable to receive the full append cable programs in 470MHZ, can
store 100 programs (Program number display 0~99);
AV Audio and AV Video input
In SCART mode, the system can automatically activate SCART
checking function to identify signal input modes(CVBS or RGB) and
input signal character(16:9 or 4:3); Capable to receive PAL, NTSC,
SECAM color systems; Very convenient to watch VCR (video
cassette recorder), Pickup Camera and other Disc’s programs.
YPbPr input
Can receive high definition YPbPr component video signal from
such as DVD Conveniently . Support format:480I、480P、576I、576P
720P(50/60HZ)、1080I50/60HZ)、1080P50/60HZ);
VGA input
As the Terminal display Equipments of computer, it can connect with
computer conveniently. it can connect with Computer audio card by
its own Audio connection line ,so you can listen the audio
information from computer.
Program lock and child lock function
The function of program lock can lock the programsinput password
and Modification, the function of child lock can lock the keys.
Timer function
You can set turn on and turn off on time, and power off in 15 min
automatically if no signal input. Automatically enter into save energy
mode by itself if no signal in PC condition, it can be awaken if signal
inputs.
Blue screen mute noise
Model No.: LCT17CHST. doc Version: 1.0
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In condition of TVAVRGB and YPbPr, gentle blue screen will be
displayed if no signal input.
Chinese/English menu
Adopt the design of Convenient and Simple graphic menu, you can
operate menu more conveniently and more intuition.
Save energy function(power management mode)
When TV is used as PC display terminal, and PC has no output
signal . The TV will be power off in about 30 Seconds automatically,
and enter into standby condition. press down Power/P+/P-/ Number
key of Remote control or the PC signal appearance again, the TV
will be on automatically.
Plug-and-play
The TV works as the terminal Equipments of computer, need not
equip install software,it is real Plug-and-Play.
Automatic correct
By its automatic correct function ,the LCD TV can bring you the best
view.
No Flickerno Radiation Green environmental protection
Because of it’s Advanced power Management mode, the TV can
realize standby and recall on function.
ACI function ( Auto channel Installation ).
Stereo and digital accompanying sound processing.
Auto identify and demodulate IGR, and decode NICAM digital
accompanying sound.
Zoom image function
Support follow zoom function: Full screen mode4:3 mode16:9
TFT,16:9(4:3 TFT)、Movie modeSub-title movie mode.
Light weightsmall dimensionLow power consumption
Advanced picture quality Strengthen function
Model No.: LCT17CHST. doc Version: 1.0
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Dynamic skin color Correct: Improve distort color in picture, make it
Near to real color.
Black level Extension: blacken the more black area of picture, Raise
the contrast in Dark Background.
Color Edge correct: Increase the Steep of color signal edge ,make
the edge of color Transition more clearly .
Brightness edge correct: increase the steep of Brightness signal
edge, make the edge of picture is more clearly.
Super fine and inner fairness TFT
10-page teletext storage
Dynamic comb filter
Headphones output
Model No.: LCT17CHST. doc Version: 1.0
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ELECTRIC CIRCUIT
The LS07 chassis LCD TV is composed of steady voltage circuitinverter Circuit RF circuitvideo Strengthen circuit、video Processing circuitPower Enlarge circuitVGA circuitsystem control circuit and key control circuit. The block diagram of circuit Constitute as below:
Model No.: LCT17CHST. doc Version: 1.0
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MAIN ICs FUNCTION INTRODUCTION
GENERAL INTRODUCTION
No. Name Model Main Function
1 A1 TAF5-E2I21RW2 RF tuner 2 3 U3 MST518 AD converter and format change 4 U2 UOC(TDA15021H) Video decode and MCU control 5 Q9 Si2311DS MOS switch 6 7 U19 NTMS10P02 MOS switch 8 U23 LM2596-5.0 Liner voltage IC
9 U1 24LC21A
10 U4 24LC32A 11
U8U21
U11U12
U6U20
TDA1517AWT Audio amplifier
IRF7316 MOS switch
EEPROM(save display parameter
information)
EEPROM(save user control information)
PI5V330A Video switch
Model No.: LCT17CHST. doc Version: 1.0
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1. MST518 High Integration Chip:
MST518 is a high performance、high integration image processor which is designed for LCD, it can support SXGA format (1280*1024).it integrates a group of AD converter 、high quality format transform system、OSD generator output clock generatormultiple format output display interface (support TTL LVDSRSDS) MST518 feature:
z Have high quality Expand transform and compress transform, can
output XGA format signal
z Integrated LVDS circuit inside z 8 bit high quality ADC inside z Double VGA input, Software switch z Support ITU-656 format signal input z Support H/V synccomposite syncgreen composite sync input, and
detect automatically by itself
z Programmable 10 bit Gamma correct, the brightness and contrast is
adjustable
z 8 color256 Character OSD z Built-in DDC circuit inside z Low standby power
Support TTLdouble LVDS signal output, Software switch
MST518 Pin Function: Pin Definition Pin Function
CPU Interface 33 HWRESET 82 Chip select signal of three-wire serial bus 83 data signal of three-wire serial bus 84 SCL clock signal of three-wire serial bus 85 INT interrupt 98-91 AD [7:0] 125 BUSTYPE Bus type select Analog Interface 38 HSYNC0 Analog Horizontal sync signal input channel 0 39 VSYNC0 Analog vertical sync signal input channel 0 40 HSYNC1 Analog Horizontal sync signal input channel 1 41 VSYNC1 Analog vertical sync signal input channel 1 78 RMID Scalar internal reference. voltage 79 REFP 80 REFM
75 RIN0 Analog red signal input channel 0
74 RIN0M
73 SOGIN0 Green sync signal input channel 0
72 GIN0 Analog green signal input channel 0
71 GIN0M
70 BIN0 Analog blue signal input channel 0
69 BIN0M
Model No.: LCT17CHST. doc Version: 1.0
Hardware resethigh voltage enable
Parallel busthe chassis is not used
internal ADC decouple internal ADC decouple
Analog red signal input channel 0 re-grounding voltage
Analog green signal input channel 0 re-grounding voltage
Analog blue signal input channel 0 re-grounding voltage
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66 RIN1M
65 RIN1 Analog red signal input channel 1
64 GIN1M
63 GIN1 Analog green signal input channel 1 62 SOGIN1 Green sync signal input channel 1
61 BIN1M
60 BIN1 Analog blue signal input channel 1 55 REXT Outside connect 390 with 3.3V LCD Interface 145 OCLK Clock output 146 LDE enable signal 144 LVSYNC vertical sync output 143 LHSYNC Horizontal sync output 138 LVA0M 137 LVA0P LVDS output 0+ 136 LVA1M 135 LVA1P LVDS output 1+ 134 LVA2M 133 LVA2P LVDS output 2+ 128 LVA3M 127 LVA3P LVDS output 3+ 132 LVACKM 131 LVACKP LVDS clock signal output + 26-23,18-15 RB[7:0] TTL red signal channel 14-11, 8-5 GB[7:0] TTL green signal channel 4,3,154,153,150-147 BB[7:0] TTL blue signal channel GPIO Interface 87 GOUT1/PWM1 PWM output 1 86 GOUT0/PWM0 PWM output 0 2 BYPASS Outside connect filter capacitor 29 DDC_DAT Analog interface DDC data 30 DDC_CLK Analog interface DDC clock 31 DDCROM_CLK DDC ROM clock 32 DDCROM_DAT DDC ROM data 34 XIN Crystal oscillator signal input 35 XOUT Crystal oscillator signal output Power Pins 48, 54, 58, 77 AVDD A/D convert power supply 56 AVDD_PLL PLL power supply 36 AVDD_MPLL MPLL power supply 10, 22, 88, 99, 111, 129, 139, 151 19, 102, 114, 142 VDDC Digital circuit power supply 1, 9, 20, 21, 37, 42, 45, 51, 57, 59, 76, 81, 89, 100, 101, 112, 113, 130, 140, 141, 152
VDDP Digital signal output power supply
GND Digital circuit ground
Analog red signal input channel 1 re-grounding voltage
Analog green signal input channel 1 re-grounding voltage
Analog blue signal input channel 1 re-grounding voltage
LVDS output 0
LVDS output 1
LVDS output 2
LVDS output 3
LVDS clock signal output
Model No.: LCT17CHST. doc Version: 1.0
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