Akai LTA-32N658HCP Schematic

LTA-32N658HCP LTA-32N680HCP

LTC-26N680HCP

LTC-32N680HCP

LCD COLOUR TV

SERVICE MANUAL

MODEL: LTC-26N680HCP LTC-32N680HCP

LTA-32N680HCP LTA-32N658HCP

CHASSIS NO.: LS02/PS02

Please read this manual carefully before service.

Catalog

UChapter1 Specifications and CompositionU ......................................................4

UChapter2 Function Introduction of Main IC U ....................................................7

UChapter3 Analysis of Signal process Flowchart and key point

measure date

UChapter4 Maintenance Procedure and Examples of Typical

troubleshooting

UChapter5 Spare Part ListsU.............................................................................................42

UChapter6 Factory Setup and noticeU......................................................................43

U ....................................................................................................31

U ..............................................................................................40

Appendix: Circuit Schematic diagram

0BChapter 1: Specifications and Composition

1. Models for LS02/PS02 chassis :

Region Europe America Other regions

Original

Models

LT26GHxxE LT37GHxxE

LT32GHxxE LT42GHxxE

LT47GHxxE

xx:01,19,29,30,41 etc.

PT32GHxxE PT42GHxxE

PT50GHxxE

xx:218,528,26,18,36

LT26GHxxU LT37GHxxU

LT32GHxxU LT42GHxxU

LT47GHxxU

xx:01,19,29,30,41 etc.

PT32GHxxU PT42GHxxU

PT50GHxxU

xx:218,528,26,18,36

LT26GHxxA LT37GHxxA

LT32GHxxA LT42GHxxA

LT47GHxxA

xx:01,19,29,30,41 etc.

PT32GHxxA T42GHxxA

PT50GHxxA

xx:218,528,26,18,36

2. Main Feature

Region Europe America Other regions

Color system PAL、SECAM NTSC、PAL M / N PAL 、NTSC、SECAM RF

signal Video or Y/C signal PAL、NTSC、SECAM PAL、NTSC、SECAM PAL、NTSC、SECAM

Program presetting 100 （0-235）

Audio output（THD≤7%） 5W+5W 5W+5W 5W+5W Power source 100V～240V 100V～240V 100V～240V Teletxt 100 pages X 100 pages CCD X Yes X VCHIP X Yes X Sound demodulator NICAM、IGR BTSC NICAM、IGR SCART Yes X X VGA Yes Yes Yes YPb P r Yes Yes Yes HDM I Ye s Yes Yes Ear p h one Yes Yes Yes

OSD language

Auto Off without Signal 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

Plug and Play

Sound system D/K、B/G、I、L/L’ M/N D/K、B/G、I、M

181 （AIR：2-69；CABLE： 1-125）

English, French, German, Italian, Portuguese etc.

5 minutes

LCD TV could be used as computer screen, no need for the installation of software, which is Plug and Play in real sense

English, French, Portuguese, Spanish etc.

236 （0-235）

English, French, German, Spanish etc.

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:

RS232

IR_Key

12V

LVDSD_Port

EU Model

CHN Model

PS301

HDMI

E2PROM

VGA

Flash

SVP_AX32

Y1Pb1Pr1

Y1Pb1PR1/L3R3

Pb1

I/O

8Mx16DDR

TV-CVBS,SIF

V1,RGB,FS1,FB1,Vout1

Y C,FS2

Y C

Lin2/Rin2 Lo2/R02

S-Video

S_Video

Pb1

S_Video

AMP

Speaker

TUNER

Lin1/Rin1 Lo1/Ro1

SCART2

SCART1

Headphone

Pb1

Y2 Pb2 Pr2

VO1

LO1

RO1

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

module

signal, controls the Video (brightness, contrast, chroma, hue, definition etc),

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.

Remote

reception

module

Built-in powe

Keyboard

module

LCD screen

module

Side AV

board

The remote reception board module is constituted by an indicator-light and a

remote reception. Customer could manipulate the LCD TV by using remote

controller very conveniently. By the color of the indicator light, the operation

mode of the LCD TV could be judged (red is standby, green is power on).

Convert the 100V～240V （50/60HZ）AC into DC, output have +12V, +5V,

+3.3V and the +5V_STB in standby state. board module

Keyboard module has 7 function keys (program +/-, volume +/-, AV/TV,

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

turn on the backlight CCFL (Cold Cathode Fluorescent Light); the LCD screen process the video signal from signal board and reappear.

Side AV board is used for earphone output.

Chapter 2: Function Introduction of Main IC

1. Main ICs and functional modules of LS02/PS02 chassis

No. Item no. Model Main function

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

AFT7/W003

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 、 LV D S 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×16bits DDR SDRAM

6 U9 TDA9886T

Multistandard alignment-free IF-PLL demodulators

7 U11 74HC4052 Audio signal switch of AV terminal

8 U15 74LVC14A

VGA line and field synchronizing signal waveform shaping

9 U16 AT24C64 EEPROM

10 U17 IRF7404/AO4459 Field Effect Transistor

11 U22 MP1411DH DC-DC converter

12 U20、U24 AP1117E33 LDO,5V to 3.3V DC converter

13 U23 AP1122EL LDO,5V to 1.2V DC converter

14 U27 TDA7266SA Audio amplifier (BTL output)

15 U32 PS201 HDMI two-to-one switch

1B2. Function introduction of ICs or functional module of LCD TV with LS02/PS02

chassis

1. Tuner (Asian TV:AFT7/W003;European TV: AFT7/W103;American TV: AFT7/W300)

No. Terminal name Description 1 AGC AGC voltage supply

2 NC No Connected 3 SAS Address Selection Line 4 SCL Serial Clock Line 5 SDA Serial Data Line 6 NC No Connected

7 BP +B For PLL & Mixer 8 ADC/NC ADC Input/ No Connected 9 NC No Connected 10 NC No Connected 11 IF1 IF Output 12 ANT VHF/UHF Signal Input

2. Video processing IC SVP-AX32LF/SVP-AX68LF The SVPTMCX video processor is a highly integrated system-on-a-chip device, targeting the

converging HDTV-ready and PC-ready LCD TV, PDP TV applications where high precision

processing of video and data are the requirements. SVPTMCX contains 6th generation

dual-purposed triple 10-bit high-precision and high speed video ADCs for both PC and video

inputs, the high-performance multi-format 3D digital comb video decoder that supports NTSC,

PAL, and SECAM*, a HDTV sync separator, motion adaptive de-interlacing engine, and the

video format conversion engine, supporting multi-window display in many different output

modes. Trident’s DCRe

family to provide the most natural cinema-realistic images. The DCRe

– Digital Cinema Reality engine, is integrated inside the SVPTMCX

technology integrates

advanced 3D-comb video decoding, advanced motion adaptive de-interlacing, object-based

digital noise reduction, advanced 7th generation scaler, film mode support, average picture

level (APL), edge smoothing and dynamic sharpness enhancement. Trident's patented Unified

Memory Architecture (UMA) that allows frame rate conversion, 3D comb video decoding, and

video enhancement processing to share the same memory buffer that is made up of high-speed

and cost-effective PC graphic memory. All these advanced digital processing techniques

combined with a true 10-bit video data processing for the most optimal video fidelity to provide

the most natural and cinema quality video images. Designed for maximum system design

flexibility, SVPTMCX integrates all video interfaces to support converging digital video, analog

video, and PC data applications. The users of Trident's single chip SVP™CX series video

processor(s) will benefit from many features while maintaining a price competitive advantage over the existing solution(s)

Main features:

●Integrated 7th Generation Motion and Edge Adaptive De-interlacing

● Integrated ADC

● PC auto tune

●Built-in 8-bit LVDS Transmitter

●Advanced 7th generation cubic-4 image scaling engine

● Advanced Chroma Processing and Dynamic Contrast Function

● Green color stretch, blue color stretch, skin color enhancement

●Integrated 7th Generation Motion Adaptive 3D Digital Comb Video Decoder with

Programmable Filter

●60Hz～100Hz interlaced scanning and 50Hz～75Hz progressive scanning

● frame rate conversion

● 14D： dynamic picture enhancements

● Advanced Film Mode Recovery-3:2/2:2 pull down

● Build-in A/D conversion function

● Teletext function

● Supports 16bits DDR memory interface

● Multi-screen display mode

● OSD and VBI/Closed caption and advanced OSD engine

Pin function description:

Table1: Pin Assignments for CPU-related and GPIO pins

Table2 Pin Assignments for Analog Support Interface

Table3 Pin Assignments for Analog Input Interface

Table4 Pin Assignments for Capture Interface (TV&RGB)

Table5 Pin Assignments for Frame Buffer Memory

Table6 Miscellaneous Pin Assignments

Table7 LVDS Output Pin Assignments

Table8 HDMI Interface Pin Assignments

Table9 Analog Audio Input/Output Interface Pin Assignments

Table10 Digital Audio Interface Pin Assignments

Table11 Pin Assignments for Power and Ground

SVP-CX32LF/ SVP-CX68LF internal block diagram:

3．AT24C64-SO8-DNS brief introduction:

The AT24C64A provides 65,536 bits of serial electrically erasable and programmable read

only memory (EEPROM) organized as 8192 words of 8 bits each. The device’s cascadable

feature allows up to 8 devices to share a common two-wire bus. The device is optimized for use

in many industrial and commercial applications where low power and low voltage operation are

essential. The AT24C64A is available in space saving 8-lead JEDEC PDIP, 8-lead JEDEC

SOIC, 8-lead EIAJ SOIC, 8-lead MAP and 8-lead TSSOP packages and is accessed via a

2-wire serial interface. In addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V

(1.8V to 5.5V) versions.

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