Akira 20CHST Schematic

LCT TV

Service Manual

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Model No.: LCT-20CHST Version: 1.0

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CONTENTS

SPECIFICATION AND FEATURE .........................................................................................................4

THE FUNCTION INTRODUCTION LS07 CHASSIS LCD TV’S MAIN............................................. 9

SIGNAL PROCESSING FLOWCHART............................................................................................... 22

SPARE PART LIST AND EASY DAMAGE PART LIST ..................................................................... 34

FACTORY MODE .................................................................................................................................36

CIRCUIT DIAGRAM............................................................................................................................ 37

WIRING DIAGRAM ............................................................................................................................. 47

EXPLODED VIEW................................................................................................................................ 48

PART LIST............................................................................................................................................. 49

Model No.: LCT-20CHST Version: 1.0

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SPECIFICATION AND FEATURE

1. The Technical Specification of F Series Europe LCD TV:

a. TM150F7E:

Max display format: 1024*768(XGA)

Audio power output: 2*2.0W

Voltage: DC12V

Power adapter voltage: AC 100～240W,50/60HZ

Power adapter Model number: FSP048-1AD101C

b. W170F7E:

Max display format: 1280*768(WXGA)

Audio power output: 2*2.0W

AC input voltage of inside power Mold piece: AC 100～240V, 50/60HZ

The unit sets: AC power Switch.

c. TM201F7E:

Max display format: 640*480(VGA)

Audio power output :2*2.0W

AC input voltage of inside power mold piece: AC 100～240V, 50/60HZ

The unit sets: AC power Switch.

2. Main feature

a. RF input , CATV function

Can receive 470MHZ CATV Programs, can store 100 programs

(Program number display 0～99);

b. 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.

c. YPbPr input

Can receive high definition YPbPr component video signal from such as DVD Conveniently .

Support format: 480I, 480P, 576I, 576P, 720P (50/60HZ), 1080I (50/60HZ), 1080P

(50/60HZ);

d. 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.

Model No.: LCT-20CHST Version: 1.0

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e. Program lock and child lock function

The function of program lock can lock the programs, input password and modification, the

function of child lock can lock the keys.

f. 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.

g. Blue screen mute noise

In condition of TV, AV, RGB and YPbPr, gentle blue screen will be displayed if no signal

input.

h. Chinese/English menu

Adopt the design of Convenient and Simple graphic menu, you can operate menu more

conveniently and more intuition.

i. 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.

j. Plug and play

The TV works as the terminal Equipments of computer, need not equip install software，it is

real Plug-and-Play.

k. Automatic correct

By its automatic correct function, the LCD TV can bring you the best view.

l. No Flicker, no radiation, green environment protection

The LCD TV can bring you high quality view, and avoid radiation, protect your eyes and look

after your health.

m. Because of it’s advanced power management mode, the TV can realize standby and recall on

function.

n. ACI function (Auto channel Installation).

o. Stereo and digital accompanying sound processing.

Auto identify and demodulate IGR, and decode NICAM digital accompanying sound.

p. Zoom image function

Support follow zoom function: Full screen mode, 4:3 mode (16:9 TFT), 16:9 (4: 3 TFT),

Movie mode, Sub-title movie mode.

q. Light weight, small dimension, low power consumption

Model No.: LCT-20CHST Version: 1.0

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r. Advanced picture quality Strengthen function

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.

s. Super fine and inner fairness TFT

t. 10-page teletext storage

u. Dynamic comb filter

v. Headphones output

3. Electric circuit of the TV

The Europe LS07 chassis LCD TV is composed of Steady voltage circuit、inverter Circuit, RF

circuit, video Strengthen circuit, video Processing circuit, Power Enlarge circuit, VGA circuit,

system control circuit and key control circuit. The block diagraph of circuit Constitute is below:

Model No.: LCT-20CHST Version: 1.0

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Model No.: LCT-20CHST Version: 1.0

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4. PCB Module introduction

The Constitute of the PCB is easier than LP03 chassis, all the Signal Processing are in Main board.

a. Main board Module

Main board Module is the main part of Signal Processing in LCD TV. The input signal is

converted into uniform digital signal, which can be identified by LCM by system control

circuit. Main board module contain two parts of signal processing Module: Philips UOC3

process analog audio and video circuit mainly, MST518 process VGA circuit, signal Format

transform system control circuit mainly. The front module can convert the video IF signal and

audio IF signal from tuner into RGB analog signal and audio signal, this part is named analog

audio and video decoding process. The RGB color from UOC is received by MST518 and

accomplishes A/D conversion, output suitable digital color signal to drive circuit of TFT. 8051

Processor inside UOC is responsible for co-operation the each part of works in system, and

Respond to user operation, which is operated on Control panel (key-press panel Module).

b. Key board Module

It is composed of 7 function keys the user can operate the LCD TV conveniently by using this

Module.

c. Remote control receiving board Module

It is composed of a work indicator light and a remote receive head. The user use the remote

control box by this module can operate the LCD TV conveniently and know the LCD TV

work condition.

d. Earphone output board module

It is composed of a earphone outlet, user can Listen to by earphone conveniently.

e. Inverter board module (include inverter circuit)

The function of the inverter is supply power to light tube in TFT and lighten the back lamp

Unit of TFT module, so the user can see the image on TFT.

Model No.: LCT-20CHST Version: 1.0

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THE FUNCTION INTRODUCTION LS07 CHASSIS LCD

TV’S MAIN IC

1. The main IC of LS07 chassis

Number Name Model Main function

1 A1 TAF5-E2I21RW2 RF tuner

2 U8, U21 TDA1517AWT Audio amplifier

3 U3 MST518 AD converter and format change

4 U2 UOC(TDA15021H) Video decode and MCU control

5 Q9 Si2311DS MOS switch

6 U11, U12 IRF7316 MOS switch

7 U19 NTMS10P02 MOS switch

8 U23 LM2596-5.0 Liner voltage IC

9 U1

10 U4 24LC32A

11 U6, U20 PI5V330A Video switch

2. The function introduction of main IC

a. 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 generator, multiple format output

display interface (support TTL, LVDS, RSDS)

MST518 feature:

 Have high quality Expand transform and compress transform, can output XGA format

signal

 Integrated LVDS circuit inside

 8 bit high quality ADC inside

 Double VGA input, Software switch

 Support ITU-656 format signal input

 Support H/V sync, composite sync, green composite sync input, and detect

automatically by itself

 Programmable 10 bit Gamma correct, the brightness and contrast is adjustable

 8 color, 256 Character OSD

 Built-in DDC circuit inside

 Low standby power

 Support TTL, double LVDS signal output, Software switch

Model No.: LCT-20CHST Version: 1.0

24LC21A EEPROM (save display parameter

information)

EEPROM（save user control information）

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MST518 pin function:

And CPU interface

Pin Pin name Pin function

33 HWRESET

82 CS Chip select signal of three-wire serial bus

83 SDA 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 Scaler internal reference voltage

79 REFP

80 REFM

75 RIN0 Analog red signal input channel 0

74 RIN0M Analog red signal input channel 0 regrounding voltage

73 SOGIN0 Green sync signal input channel 0

72 GIN0 Analog green signal input channel 0

71 GIN0M Analog green signal input channel 0 regrounding

70 BIN0 Analog blue signal input channel 0

69 BIN0M Analog blue signal input channel 0 regrounding voltage

66 RIN1M Analog red signal input channel 1 regrounding voltage

65 RIN1 Analog red signal input channel 1

63 GIN1 Analog green signal input channel 1

62 SOGIN1 Green sync signal input channel 1

61 BIN1M Analog blue signal input channel 1 regrounding voltage

60 BIN1 Analog blue signal input channel 1

55 REXT Outside connect 390 with 3.3V

GIN1M

Hardware reset，high voltage enable

Parallel bus，the chassis is not used

internal ADC decouple ＋

internal ADC decouple －

voltage

Analog green signal input channel 1 regrounding

voltage

Model No.: LCT-20CHST Version: 1.0

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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 ouput 0+

136 LVA1M

135 LVA1P LVDS ouput 1+

134 LVA2M

133 LVA2P LVDS output 2+

128 LVA3M

127 LVA3P LVDS ouput 3+

132 LVACKM

131 LVACKP LVDS clock signal ouput +

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

LVDS output 0－

LVDS output 1－

LVDS ouput 2－

LVDS output 3－

LVDS clock signal ouput－

Model No.: LCT-20CHST Version: 1.0

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MST518 inner diagraph:

b. TDA15021H introduction:

The third-generator super integrated circuit UOC III which designed by Philips company

recently integrates with video decode, 2D comb filter, high quality audio transacting

technique, suitable with the European teletext technique and suitable with US closed caption

and V-chip function compatible with single series IC. The series of UOC III have high

integrity, besides completing the Processing of all small signals (IF signal demodulation,

video decode, H/V signal, sound DSP), and integrate all the MCU function. It has many

Advantages, example: the compact circuit, good performance, simple craft and etc. It

matched with company’s high performance price ratio and high product efficiency

demanding. It is suitable for 4:3 or 16:9, 50/60HZ and A100/120HZ TV system, the main

characteristic below:

 Multi-system IF demodulation、analog video decode

 Comb filter internal

 NICAM, stereo auto identify and decode

 SCART input channel source auto identify (RGB, CVBS), SCART image input format

identify (4:3, 16: 9)

 Support 4:3, 16:9 display format

 TOP/FLOF TELETEXT (10 page) receive display

 Channel auto install ACI function (can preset)

 4 CVBS or 3 Y/C input, 1 CVBS output, 2 YcrCb/2 RGB input

 4 AV audio input, 1 AV adjustable audio volume output

 Volume auto level control circuit

 Global FM demodulation

 Picture quality enhancement of dynamic peak value control, skin color correct, Gamma

correct, Black level extension.

Model No.: LCT-20CHST Version: 1.0

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 Can turn down horizon and vertical scan part output H/V sync signal to Scaler

 128K Flash Memory inside, support program on line

 Automatic Y/C signal identify

TDA15021H pin function:

Pin Pin name Pin function

1 VSSP2 Grounding

2 VSSC4 Grounding

3 VDDC4 +1.8V

4 VDDA3 +3.3V

5 VREF_POS_LSL +3.3V

6 VREF_NEG_LSL+HPL 0V

7 VREF_POS_LSR+HPR +3.3V

8 VREF_NEG_HPL+HPR 0V

9 VREF_POS_HPR +3.3V

10 XTALIN Crystal oscillator input

11 XTALOUT Crystal oscillator output

12 VSSA1 Grounding

13 VGUARD/SWIO Protecting voltage input or I/O

14 DECDIG DECDIG signal input

15 VP1 +5V

16 PH2LF The second grade horizontal phase lock filter

17 PH1LF The first grade horizontal phase lock filter

18 GND1 Grounding

19 SECPLL SECAM PLL decouple

20 DECBG Inside reference voltage decouple

21 EWD/AVL VDD5A voltage input

22 VDRB Tv vertical sync signal output

23 VDRA Vertical sync output

24 VIFIN1 VIFinput 1

25 VIFIN2 VIFinput 2

26 VSC Outside connect vertical ramp capacity

27 IREF Recurrent input

28 GNDIF IF grounding

29 SIFIN1 SIF input 1

30 SIFIN2 SIF input 2

31 AGCOUT Tuner RF AGC control voltage output

Model No.: LCT-20CHST Version: 1.0

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32 EHTO Over voltage protection input

33 SSIF MUTE control signal input

34 AUDIOIN5L Av left track signal input

35 AUDIOIN5R Av right track signal input

36 AUDOUTSL SCART/CINCH left track output

37 AUDOUTSR SCART/CINCH right track output

38 DECSDEM Track demodulator decouple

39 QSSO De emphasis capacitor

40 GND2 Grounding

41 PLLIF IF_PLL filter

42 SIFAGC Sound intermediate frequency auto gain control

43 IFVO IF demodulation video output

44 FMRO Fm broadcast output

45 VCC8V The supply voltage of Sound switch

46 AGC2SIF The second sound intermediate frequency auto gain

control

47 VP2 +5V

48 IFVO The video output of Choose channel

49 AUDIOIN4L HD signal left track audio output

50 AUDIOIN4R HD signal right track audio output

51 CVBS4/Y4 S-video luminance signal input

52 C4 S-video chroma signal input

53 AUDIOIN2L PC signal left track audio input

54 AUDIOIN2R PC signal right track audio input

55 CVBS2/Y2 AV CVBS signal input

56 AUDIOIN3L Inside DVD module left track audio input

57 AUDIOIN3R Inside DVD module right track audio input

58 CVBS3/Y3 Inside DVD module brightness signal input

59 C2/C3 Inside DVD module chroma signal input

60 AUDOUTLSL Main channel left track output

61 AUDOUTLSR Main channel right track output

62 AUDOUTHPL Earphone channel left track output

63 AUDOUTHPR Earphone channel right track output

64 CVBS/PIP CVBS/PIP output

65 SVM Scan modulate output

66 FBISO Flyback input/sandcastle output or composite H/V

timing output

67 HOUT Horizontal sync signal output

Model No.: LCT-20CHST Version: 1.0

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68 VSScomb Grounding

69 VDDcomb +5V

70 VIN V signal input

71 UIN U signal input

72 YIN Y signal input

73 YSYNC Y signal input for Sync separate

74 YOUT Y signal output

75 UOUT U signal output

76 VOUT V signal output

77 INSSW3 RGB/YpbPr insert identify signal input

78 R/PrIN3 R/Pr signal input

79 G/YIN3 G/Y signal input

80 B/PbIN3 B/Pb signal input

81 GND3 Grounding

82 VP3 +5V

83 BCLIN Beam current limiter input

84 BLKIN Black current input

85 RO R basic color signal input

86 GO G basic color signal output

87 BO B basic color signal output

88 VDD3 +3.3V

89 VREFAD_NEG 0V

90 VREFAD_POS +3.3V

91 VREFAD Audio ADC re.voltage

92 GNDA Grounding

93 VDDA +1.8V

94 VDD3A +3.3V

95 VSSADC Grounding

96 VADC +1.8V

97 INT0 Remote control signal input

98 P10/INT1 DPF clock line

99 P11/T0 DPFdata line

100 VDDC2 +1.8V

101 VSSC2 Grounding

102 P04/12SWS MST reset signal

103 P03/12SCLK HD Pc select control signal

104 P02/12SDO2 Power Amplifier standby control signal

105 P01/12SDO1 TV_DPF select control signal

Model No.: LCT-20CHST Version: 1.0

+ 35 hidden pages

Akira 20CHST Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual