Akira LCT-20CHST Manual de usuario

LCT TV

Service Manual

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Model No.: LCT-20CHST

Version: 1.0

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Model No.: LCT-20CHST

Version: 1.0

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

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Model No.: LCT-20CHST

Version: 1.0

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.

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Model No.: LCT-20CHST

Version: 1.0

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

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Model No.: LCT-20CHST

Version: 1.0

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:

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Model No.: LCT-20CHST

Version: 1.0

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Model No.: LCT-20CHST

Version: 1.0

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.

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Model No.: LCT-20CHST

Version: 1.0

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

24LC21A EEPROM (save display parameter

information)

10 U4 24LC32A EEPROM（save user control information）

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

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Model No.: LCT-20CHST

Version: 1.0

MST518 pin function:

And CPU interface

Pin Pin name Pin function

33 HWRESET

Hardware reset，high voltage enable

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]

Parallel bus，the chassis is not used

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

internal ADC decouple ＋

80 REFM

internal ADC decouple －

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

voltage

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

64 GIN1M Analog green signal input channel 1 regrounding

voltage

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

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