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

1

Please read this manual carefully before service.

2

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

3

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:

4

RS232

IR_Key

12V

5V

LVDSD_Port

19

EU Model

CHN Model

PS301

HDMI

E2PROM

1

VGA

Flash

SVP_AX32

Y1Pb1Pr1

Y1Pb1PR1/L3R3

V3

Y1

Pb1

V3

I/O

8Mx16DDR

TV-CVBS,SIF

V1,RGB,FS1,FB1,Vout1

Y C,FS2

Y C

L3

L3

Lin2/Rin2 Lo2/R02

S-Video

R3

S_Video

Pb1

R3

S_Video

AMP

Speaker

IF

TUNER

Lin1/Rin1 Lo1/Ro1

SCART2

V2

L2

V1

R2

SCART1

L1

Headphone

R1

Pb1

Pb1

Y2 Pb2 Pr2

VO1

LO1

RO1

Y1

5

4. Introduction of PCB module

r

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

1

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

2

reception

module

Built-in powe

3

Keyboard

4

module

LCD screen

5

module

Side AV

6

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.

6

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

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

TM

modes. Trident’s DCRe

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

– Digital Cinema Reality engine, is integrated inside the SVPTMCX

TM

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

8

● 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

9

10

11

Table2 Pin Assignments for Analog Support Interface

Table3 Pin Assignments for Analog Input Interface

Table4 Pin Assignments for Capture Interface (TV&RGB)

12

Table5 Pin Assignments for Frame Buffer Memory

Table6 Miscellaneous Pin Assignments

13

Table7 LVDS Output Pin Assignments

Table8 HDMI Interface Pin Assignments

Table9 Analog Audio Input/Output Interface Pin Assignments

14

Table10 Digital Audio Interface Pin Assignments

Table11 Pin Assignments for Power and Ground

15

16

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.

17

Main features:

• Low-Voltage and Standard-Voltage Operation

– 2.7 (VCC = 2.7V to 5.5V)

– 1.8 (VCC = 1.8V to 5.5V)

• Low-Power Devices (ISB = 6μA @ 5.5V) Available

• Internally Organized 4096 x 8, 8192 x 8

• Two-wire Serial Interface

• Schmitt Trigger, Filtered Inputs for Noise Suppression

• Bidirectional Data Transfer Protocol

• 100 kHz (1.8V) and 400 kHz (2.5V) Clock Rate for AT24C32A

• 400 kHz (1.8V) Clock Rate for AT24C64A

• Write Protect Pin for Hardware Data Protection

• 32-byte Page Write Mode (Partial Page Writes Allowed)

• Self-timed Write Cycle (5 ms Max)

• High Reliability

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

• Automotive Grade, Extended Temperature and Lead-free/Halogen-free

Devices Available

• 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ SOIC, 8-lead MAP and 8-lead

TSSOP Packages

• Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers

Pin Configuration

Pin NO. Pin Name Function

1-3

4

5

6

7

8

A0 – A2 Address Inputs

GND Ground

SDA Serial Data

SCL Serial Clock Input

WP Write Protect

VCC Power Supply

18

AT24C64-SO8-DNS internal functional block diagram：

4．W25X80-VSSIG brief introduction

W25X80-VSSIG main features:

■

Family of Serial Flash Memories

8M-bit/1M-byte(1,048,576)

●

256-bytes per programmable page

●

U n i f o r m 4 K - b yte Sectors/64K-byte Blocks

●

■

SPI with Single or Dual Outputs

Clock ,Chip Select, Data I/O, Data Out

●

Optional Hold function for SPI flexibility

●

19

■

Data Transfer up to 150M-bits/second

Clock operation to 75MHz

●

F a s t R e a d D u a l O u t i n s t r u c t i o n

●

Auto-increment Read capability

●

■

F l e x i b l e A r c h i t e c t u r e w i t h 4 K B s e c t o r s

Sector Erase(4K-bytes)

●

Block Erase(64K-byte)

●

Page program up to 256 bytes<2ms

●

■

Low Power Consumption, Wide Temperature Range

Single 2.7 to 3.6V supply

●

5 m A a c t i v e c u r r e n t , 1 u A P o w e r - d o w n ( t y p )

●

■

Software and Hardware Write Protection

White-Protect all or portion of memory

●

Enable/Disable protection with /WP pin

●

Top or bottom array pr otection

●

Pin introduction:

Pin NO. Pin Name I/O Function

1 /CS I Chip Select Input

2 DO O Data Output

3 /WP I White Protect input

4 GND Ground

5 DIO I/O Data Input/Output

6 CLK I Serial Clock Input

7 /HOLD I Hold input

8 VCC Power Supply

20

W25X80-VSSIG internal block diagram:

5．HY5DU281622FTP-4 brief introduction:
The HY5DU281622FT(P) is a 134,217,728-bit CMOS Double Data Rate(DDR) Synchronous

DRAM, ideally suited for the main memory applications which requires large memory density

and high bandwidth. This Hynix 128Mb DDR SDRAMs offer fully synchronous operations

referenced to both rising and falling edges of the clock. While all addresses and control inputs

are latched on the rising edges of the CK (falling edges of the /CK), Data,

Data strobes and Write data masks inputs are sampled on both rising and falling edges of it.

21

The data paths are internally pipelined and 2-bit prefetched to achieve very high bandwidth. All

input and output voltage levels are compatible with SSTL_2.

main features:

• VDD, VDDQ = 2.3V min ~ 2.7V max

(Typical 2.5V Operation +/- 0.2V for DDR266, 333)

• VDD, VDDQ = 2.4V min ~ 2.7V max

(Typical 2.6V Operation +0.1/- 0.2V for DDR400,400Mbps/pin product and 500Mbps/pin

product )

• All inputs and outputs are compatible with SSTL_2 interface

• Fully differential clock inputs (CK, /CK) operation

• Double data rate interface

• Source synchronous - data transaction aligned to bidirectional data strobe (DQS)

• x16 device has two bytewide data strobes (UDQS,LDQS) per each x8 I/O

• Data outputs on DQS edges when read (edged DQ)

Data inputs on DQS centers when write (centered DQ)

• On chip DLL align DQ and DQS transition with CK transition

• DM mask write data-in at the both rising and falling edges of the data strobe

• All addresses and control inputs except data, data strobes and data masks latched on the

rising edges of the clock

• Programmable CAS latency 2/2.5 (DDR266, 333) and 3/4 (DDR400, 400Mbps/pin product

and 500Mbps/pin product) supported

• Programmable burst length 2/4/8 with both sequential and interleave mode

• Internal four bank operations with single pulsed/RAS

• Auto refresh and self refresh supported

• tRAS lock out function supported

• 4096 refresh cycles/64ms

• JEDEC standard 400mil 66pin TSOP-II with 0.65mm pin pitch

• Lead free (*ROHS Compliant)

22

Pin introduction:

23

HY5DU281622FTP-4 internal block diagram:

6. TDA9885T/TDA9886T brief introduction:
The TDA9885 is an alignment-free multistandard (PAL and NTSC) vision and sound IF signal

PLL demodulator for negative modulation only and FM processing.

The TDA9886 is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound

IF signal PLL demodulator for positive and negative modulation, including sound AM and FM

processing.

Features:

· 5 V supply voltage

· Gain controlled wide-band Vision Intermediate Frequency (VIF) amplifier, AC-coupled

· Multistandard true synchronous demodulation with active carrier regeneration: very linear

demodulation ,good inter modulation figures, reduced harmonics, and excellent pulse

response

· Gated phase detector for L and L-accent standard

24

· Fully integrated VIF Voltage Controlled Oscillator (VCO), alignment-free, frequencies

switchable for all

negative and positive modulated standards via I2C-bus

· Digital acquisition help, VIF frequencies of 33.4, 33.9,38.0, 38.9, 45.75, and 58.75 MHz

· 4 MHz reference frequency input: signal from Phase-Locked Loop (PLL) tuning system or

operating as crystal oscillator

· VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector

for negative modulated signals and as a peak white detector for positive modulated signals

· External AGC setting via pin OP1

· Precise fully digital Automatic Frequency Control (AFC) detector with 4-bit digital-to-analog

converter, AFC bits readable via I2C-bus

· Take Over Point (TOP) adjustable via I2C-bus or alternatively with potentiometer

· Fully integrated sound carrier trap for 4.5, 5.5, 6.0, and 6.5 MHz, controlled by FM-PLL

oscillator

· Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode, PLL controlled

· SIF-AGC for gain controlled SIF amplifier, single reference QSS mixer able to operate in high

performance single reference QSS mode and in intercarrier mode, switchable via I2C-bus

· AM demodulator without extra reference circuit

· Alignment-free selective FM-PLL demodulator with high linearity and low noise

· Four selectable I2C-bus addresses

· I2C-bus control for all functions

· I2C-bus transceiver with pin programmable Module

Address (MAD).

Pin function

25

TDA9886T internal block diagram:

26

7. 74HC4052 brief introduction:

The M74HCT4052 is a dual four-channel analog MULTIPLEXER/DEMULTIPLEXER

fabricated with silicon gate C2MOS technology and it is pin to pin compatible with the equivalent

metal gate CMOS4000B series. It contains 8 bidirectional and digitally controlled analog

switches.

Feature:

Low power dissipation:

•
ICC = 4mA (MAX.) at TA=25°C

•Logic level translation to enable
TTL logic signal to communicate
With ±5V analog signal

• Low "ON" resistance:
70W TYP. (VCC - VEE = 4.5V)
50W TYP. (VCC - VEE = 9V)

•Wide analog input voltage range: ±6V

•Fast switching: tpd = 13ns (TYP.) at TA = 25 °C

• Low crosstalk between switches

• High ON/OFF output voltage ratio

•Wide operating supply voltage range (VCC - VEE) = 2V TO 12V

• Low sine wave distortion: 0.02% at VCC - VEE = 9V

•Compatible with TLL outputs: VIH = 2V(MIN.) VIL = 0.8V (MAX.)

• PIN and function compatible with 74 series 4052

Pin introduction:

Pin SYMBOL Function description

1,5,2,4 2Y0 to 2Y3 Independent Input Outputs

6 INH INHIBIT Input

7 VEE Negative Supply Voltage

10,9 A,B Select Inputs

12,14,15,11 1Y0 to 1Y3 Independent Input Outputs

3 2-COM Common X Output/Input

13 1-COM Common Y Output/Input

8 GND Ground

16 VCC Positive Supply Voltage

27

74HCT4052 internal block diagram:

8. 74LVC14A brief introduction:

The 74LVC14A is a high-performance, low-power, low-voltage, Si-gate CMOS device, superior

to most advanced CMOS compatible TTL families. Inputs can be driven from either 3.3 or 5 V devices.

This feature allows the use of these devices as translators in a mixed 3.3 and 5V environment.

The 74LVC14A provides six inverting buffers with Schmitt-trigger action. It is capable of

transforming slowly changing input signals into sharply defined, jitter-free output signals.

Feature:

· Wide supply voltage range from 1.2 to 3.6 V

· CMOS low power consumption

· Direct interface with TTL levels

· Inputs accept voltages up to 5.5 V

· Complies with JEDEC standard no. 8-1A

· Specified from -40 to +85 °C and -40 to +125 °C.

Pin introduction:

PIN SYMBOM DESCRIPTION

1,3,5,9,11 and 13 1A to 6A Data input

2,4,6,8,10 and 12 1Y to 6Y Data output

7 GND Ground

14 VCC supply voltage

28

14.TDA7266SA brief introduction:

The TDA7266SA is a dual bridge amplifier specially designed for TV and Portable Radio

applications.

Feature:

• WIDE SUPPLY VOLTAGE RANGE (3-18V)

• MINIMUM EXTERNAL COMPONENTS

– NO SWR CAPACITOR

– NO BOOTSTRAP

– NO BOUCHEROT CELLS

– INTERNALLY FIXED GAIN

• STAND-BY & MUTE FUNCTIONS

• SHORT CIRCUIT PROTECTION

• THERMAL OVERLOAD PROTECTION

PIN CONNECTION：

29

TDA7266SA internal block diagram:

30

2BChapter 3: Analysis of Signal process Flowchart and key point

measure date

This chapter mainly introduces the receipt and dispose of AV signal the power supply

system and system control process of this TV.

1. Video signal flow

RF signal is demodulated by tuner, then the obtained video signal and signals inputted from
COMPONENT terminal, AV, S-VIDEO, 2-way SCART interface and VGA interface are all sent
into video-processing IC SVP-AX32LF/SVP-AX68LF for decoding. The different format input
signals are changed into uniform LVDS signals, and are sent to LCD screen. In addition, TV
video signal is processed by SVP-AX32LF/SVP-AX68LF to generate 2 CVBS signal, which are
used in SCART video output.

Signal inputted from HDMI interface is into video decoding IC SVP-AX32LF/SVP-AX68LF
for decoding. After procession, the obtained uniform LVDS differential signal is sent into LCD
Screen.

2.Sound process flow

RF signal is demodulated by tuner, and then the obtained SIF signal (SIF-2 signal) and
audio signal inputted from Scart1 interface are are first sent into 74HCT4052D for choosing
passages. The output audio signal of 74HC4052 is sent into power amplifier TDA7266DNS, and
the amplified signal is finally sent into speaker or earphone.

Signals from HDTV terminal, AV terminal, Scart2 interface and PC Audio are first sent into
74HCT4052 for choosing passages, and then sent into SVP-AX32LF/SVP-AX68LF for
demodulation and sound process. The output audio signal of SVP-AX32LF/SVP-AX68LF is
sent into power amplifier TDA7266DN, and finally the amplified signals are sent into speaker or
earphone.

After the demodulation and sound effect processing of SVP-AX32LF/SVP-AX68LF, there is
an audio output which is used for sound output of Scart1 terminal.

3. Power supply system

There are 3 ways of voltage output in the power panel:+12V、+5V and +5V-SB. +12V output is

provided for power amplifier TDA7266, and is also changed into +1.2V output by MP1411 to
supply SVP-AX IC; +5V output is changed into 3.3V output，2.5Voutput and 1.2V output by

DC/DC (such as AX_VD33) to satisfy the needs ICs. +12V and +5V outputs will be cut off in

standby state. While +5-SB output is the power supply of MCU, infrared receiver and EEPROM
etc, and will be cut off when the AC is turn off.

5V output will be divided into two ways: one way is changed into 5VA power supplies
through DC/DC converter for TUNER, 74HCT4052 IC etc and peripheral circuits; the other way
of 5V voltage supply power especially for MCU, infrared receiver and EEPROM etc, and will still
operating in standby state.
(1) The composition and distribution of the TV power supply（Next page）

31

400

262

A

R408(80mA)

*

FB22*

12V
power
CON11

FB22(320mA)

PIN

8,7,6,5

FB6(13mA)
FB26(112mA)

FB16(20mA)

FB15（160mA） FB17(45.5mA)

FB14(85.5mA)

+5VA

m

R280(20mA)

R

5V
POWER
CON11

PIN 8，

L15*

7，6， 5

FB1*

+12VA

12V shutdown mute circuit

JP3
PIN1

JP3
PIN 2

12V （ voltage of line to

screen）CON2 PIN31,32,33

U22 AP1513

1.2V

5V

_ Sound surface filter circuitry

TUNER

Change 33V

Starting up mute circuit

74HCT4052 power supply，U11 PIN 9
U11 PIN 1，2，5，4，11，12，14，15

AX_CVBS_OUT1/2 signal amplify

Power supply，U26 PIN 9，2，3，
5，6

Power supply，U4 PIN9

FB29(30mA)

FB28(44.5mA)

SVP-AX ANALOG PIN 230

SVP-AX Power Supply PIN 23，83，100，122，
151，169，233，244

SVP-AX ADC Power Supply
PIN 32，40，47，49

IF amplify circuitry

TUNER power supply，U8 PIN 7

TUNER power supply，U8

PIN 9

32

FB23*

FB25
FB24（530mA）

(187mA)
(354)

5V

N11

CO

PIN

FB27* FB29

8，7
6，5

Back light switch control CON20 PIN3，4

5V（voltage of line to screen）CON2 PIN 31，32，33，34

PWM back light switch control circuitry

U

19
change
into2.5V

FB25 FB33

DDR power supply，U7 PIN 1,3,9,15,18,33,55,61

MCU power supply，
U1 PIN 94，107，116，
128，142，113，114

FB6

MCU U1 PIN 230

U22

stabilivolt

IC

1.2V
FB28

MCU PIN 23，83，100，122，151，
169，233，244

MCU ADC power supply
PIN 32，40，47，49

MCU power supply，
U1 PIN114

L3(38.5mA)

L4(69.5mA)

FB5(15mA)

FB7(31mA)

R21(6.9mA)

FB12,FB11

U20

Change into

3.3V

AX_VD33

AX_VCC33

FB2(51mA)

FB10(3

4.5mA)

FB8(7.2mA)

FB13(47.5mA)

MCU，U1 PIN54

MCU，U1 PIN51

MCU，U1 PIN 59

MCU，U1 PIN 93，162，246

MCU，U1 PIN 202,217,228

MCU，U1 PIN 62

MCU，U1 PIN 25

MCU，U1 PIN 71

MCU，U1 PIN 72

MCU，U1 PIN 2,3,7,11,15,

33

24

(13,45mA)

FB19(40.8mA)

_SB

5V

D18，D17

CON11

PIN

2，3

Power Amplifier mute circuit

HDMI EEPROM IC，U12 PIN 8
SDA、SCL，U12 PIN 5，6

IC power supply，U15 PIN
14

CON15 SDA，SCL CON16 SDA，SCL 上

CON11 PIN 4
L：ON H：OFF

FB3

U23 5V_SB change
into 1.2V_SB

(27mA)

FB4
(62mA)

3.3V_SB

U

5V_SB
CON11

PIN

2，3

U6 power supply PIN 2

MCU IC，U1 PIN 180

HDMI IC，U32 PIN 7，17，27，33，56，13，43，50，61，69，75
HDMI IC，U32 PIN 1，20，19，42，21，22

5V SLV、MST change into 3V
Q19，Q20，Q21，Q22 PIN 2，3

MCU RESET IC（IMP810-2.63V），U18 PIN 3
MCU RESET IC（IMP810-2.63V），U18 PIN 2

MCU IC，U1 PIN 85，86，87，255，160，161，177，182，182，183，185，
157，92，89，189，190，198，201，153，154

FLASH ROM IC（W25X80-VSSIG），U5 PIN 7，8
FLASH ROM IC（W25X80-VSSIG），U5 PIN 3

LVDS，CON2 PIN 37，38，39，40

VGA EEPROM IC，U16 PIN 8
SDA、SCL，U16 PIN 5，6

MCU，U1 PIN
192，193

34

(2)

Position

Component model Pin 1(V) Pin 2(V) Pin 3(V)

number

U19 AP1117D25 GND 2.5V 5V

U20 AP1117E33 GND 3.3V 5V

U23 AZP1122EL GND 1.2V 5V

U24 AP1117E33 GND 3.3V 5V

(3) Pin sequence of power cord of power panel

Position

Pin Pin description

number

1 12VA

2 12VA

CON1

3 GND

4 GND

1 5V-SB

2,3,7,8 GND

CON23

4,5 5V

6 5V-SB

9,10 12V

4. Position and definition of the main components and sockets on mainboard(see next
page)

35

e

(1) Socket definition

Serial

number

Position

number

Connecting object Function description

1 CON1 Power panel +12V，+12V ，GND，GND

2 CON4 Speaker L+,L-,R+,R-

3 CON5 Earphone Board

4 CON8 SCART1 input

5 CON9 SCART2 input

6 CON10

HDMI input

CON27

7 CON13 VGA audio signal input

8 CON12 S terminal input

9 CON14 VGA input

10 CON21 AV Input

11 CON15 Standby

12 CON16 Standby

13 CON18 Keyboard +3.3V、GND、KEY1、KEY2

14 CON19 Remote control

+3.3V、REMOTE、GND、indicator1、indicator1

receiving board

15 CON17 Standby

16 CON20 Back light control line GND，GND，back light switch control，back light

brightness control

17 CON23 Power panel 5V-SB,GND,GND,5V,5V,5V-SB,GND,GND,12V,12V

(2) Main components descriptions

Serial

numb

Position

number

component Function description

r

A

B

C

D

E

F

G

H

I

J

K

U1

U7

U3 AT24C64 EEPROM

U5

U9

U11

U12、U16

U15

U17

U19 AP1117D25 5V to 2.5V DC-DC Converter

U24

SVP-AX32LF/SVP-AX
68LF

Video decoder, image processor, A/D and D/A
conversion

HY5DU281622FTP-4 8M×16bits DDR

W25X80-VSSIG 8M-bit Serial Flash, Store the Control program.

TDA9886T

Alignment-free multistandard vision,sound AM
and FM processing

74HC4052 Audio input switch of AV terminal

AT24C02 EEPROM

74LVC14A

VGA line and field synchronizing signal
waveform shaping

IRF7404 Thermoelectric Cooler Controller

AP1117E33 5V to 3.3V DC conversion

36

L

M

N

U23

U27

U8

AP1122EL 5V to 1.2V DC conversion

TDA7266SA Audio amplifier (BTL output)
AFT7/W003

AFT7/W103

Tuner output sound IF and video signal

AFT7/W300

5. Waveforms at key points

(1)RF inputting color bar signal, Composite Video Signal waveform at pin 11 of tuner U8, and
the waveform at pin 52 of U1（SVP-AX32LF/SVP-AX68LF） is like this:

(2)RF inputting color bar signal, clock signal SCL, pin 11 of U9, pin 6 of U3, pin 6 of U12, pin 6
of U16, pin 154 of U1, pin 4 of tuner U15:

37

(3) RF inputting color bar signal, clock signal SDA, pin 10 of U9, pin 5 of U3, pin 5 of U12, pin 5
of U16, pin 153 of U1, pin 5 of tuner U15:

(4)RF inputting grey signal, Composite Video Signal waveform at pin 11 of tuner U15, and the
waveform at pin 52 of U1（SVP-AX32LF/SVP-AX68LF） is like this:

38

(7)Inputting sound signal with 1KHz frequency, with the processing of U33 and power amplifier
TDA7266DNS, waveform at pin 1, 2, 14, 15 of U33, and waveform at CON4 speaker and CON5
earphone output interfaces:

39

3BChapter 4: Maintenance Procedure and Examples of Typical

troubleshooting

1. Failure phenomenon: The picture is normal, but OSD has line in it.

The reason and the processing: Check the pin of U7 and pin 95-150 of U1 for

pseudo soldering, and have pseudo soldering touched up.

2. Failure phenomenon: There is no sound but no picture; there is no OSD when start up,

and the back light is bright.

The reason and processing: Check the connecting line to screen, and have it

connect well

3. Failure phenomenon: There are no picture, no sound, and no flower dot in TV mode,

but AV is normal.

The reason and processing: Check the tuner and its peripheral circuits (including

bus and power supply). If the peripheral circuits work well but there is no output from

tuner, then the tuner must failure.

4. Failure phenomenon: LCD television cannot be controlled (including no starting up

with red light on, remote control and local key having no effect, etc).

The reason and processing: LCD television has crash phenomenon, restart after

power off.

5. Failure phenomenon: +5V SB voltage has output, but there are no picture, no sound,

and back light and indicating light are not on.

The reason and processing: Check other groups of voltage; if they have no

outputs, then check Flash to find if it is installed well or damaged.

When you meet the following common problems, you might diagnose and get the
solutions without contacting with the technicians.

40

Symptoms

Possible Reason Solutions

No picture, no sound, and no
indicator light on

Picture and sound with
abnormity

Picture is spotted or with
snow

No picture, no sound and
indicator light is green

Blue screen, AV or SVIDEO
is displayed

Picture is unclear or shaking
or with black horizontal strips
(in VGA mode)

VGA picture is not centered

No sound

VGA picture display with
improper color

HDMI source, with snow
pixel of full screen

The remote control does not
work

1.The power cord is not plugged in

2.The power is off

1.Contrast, sharpness, and color

are set improperly

2.Color system is set improperly

3.Sound system is set improperly

Signal source is low-grade or the
signal cord is in a lower quality

Contrast, brightness, color and
volume are all in the minimum
value or TV is in mute mode.
The signal cable is not correctly
connected.
There is no signal input or the
video cable is not connected or
incorrectly connected

VGA picture is not correctly
adjusted.

There is no audio signal input or
audio cable is not connected
correctly

The color temp is adjusted
incorrectly by user

The source generate is not
standard

Batteries are improperly installed
or exhausted

1.Plug the power cord in

2.Turn the power on

1.Adjust the value of
Contrast, sharpness, and
color

2.Set the Color system to the
country broadcasting
standard

3.Set the Sound system to
the country broadcasting
standard

Use the qualified signal cord

Adjust the value of
contrast, brightness, color
and volume
Connect the signal cable
correctly

Connect the video cable
correctly

Enter into “SETUP” menu,
select “Auto Tracking” item to
perform automatic calibration
and adjust “Phase” to solve
the problem

Connect the audio cable
correctly

Readjust the color temp, or
select the original color
setting

Plug the HDMI cable again

1.Make sure the positive and
the negative polarities are
correct.

2.Check if there is a loose
contact between the
batteries and the springs

3.Replace the batteries

41

4BChapter 5: Spare Part Lists

This listing of maintenance and repair parts are presented for reference only,

modification of parameters will not be informed. For accurate models or specifications,

please consult the newest data of our company.

15BProportion of

Number

12BName 13BPart number 14BPrint plate number

easy damage
（‰）

1. Main Board 1

Remote receiving

2.
board part

0.5

3. Keyboard part 0.5

Inner power

4.
module

FSP205-4E03

JSK4200-014

Inner power module 6B5

5. LCD screen LG.PHILIPS LCD screen 7B0.1

AFT7/W003 (IF：38MHz)

6. Electronic tuner

AFT7/W103 (IF：38.9 MHz)

Electronic tuner

AFT7/W300 (IF：45.75 MHz)

8B0.5

7. Dynamic speaker YDT613-A9-10W-8Ω Dynamic speaker 9B2

8. Dynamic speaker YDG52-A3-10W-8Ω Dynamic speaker 10B2

Remote control

9.
emitter

GK23J6 Remote control emitter 11B1

42

5BChapter 6: Factory Setup and notice

r

r

r

r

1. Enter factory menu
Switch on TV set, and make LCD at operating state:

① Press 【MUTE】 key on remote control；
② Press “MENU” key on remote control, and switch to “SOUND” option with

【V+】,【V-】key；

③ Move cursor to “Balance” option with 【P+】(or【P-】)and【V+】(or【V-】)key

to enter setting status；

④ Press number key “3”、“1”、“3”、“8”on remote control to enter password.

Entering factory mode is finished.
If you want to quit facory mode, Pls. press【Power】key to switch off the TV .
⑴ Factory menu display is presented like bellow：

chassis：LS02/PS02
SEP 18 10:37:05
Version：ELT-01-Asian-M32-257.25WL
IIC off
Clear EEPROM
Panel Control
Factory Setting
System Control
Min/Max CONTROL
White Balance（Hex）
Hotel Option
Source Select
EnterISP

nel Table ChangHong

Chan

Notes：“chassis：LS02/PS02”is the TV chassis number，“Sep 18 10:37:05”is the latest
upgrading time for software， and“Version：ELT-01-Asian-M32-257.25WL”is the version
number of current software.
(2)The detailed setting items are given bellow:
Contents of first page：

Setting item Setting content Setting method

IIC Off

Clear EEPROM

Panel Control

Factory Setting Factory Setting

System Control System Control

Min/Max Control

White Balance

Hotel Option Hotel mode

Source Select

EnterISP

Stop I²C bus

communication

E²PROM

initialization

Screen back light

brightness control(or

select the panel type)

Analog datum setting

of picture and sound

White balance

parameters setting

“OK”or“V+”,“V-”key

Press “OK”key first，then

press “V-”key

Press “V+”,“V-”keys to

enter submenu

Press “V+”,“V-”keys to

enter submenu

Press “V+” key to ente

submenu

Press “V+” key to ente

submenu

Press “V+” key to ente

submenu

Press “V+” key to ente

submenu

Remark

Used for updating
program

Only done in first
setting station

Only set sub
brightness
Bri Mid

Used for hotel TV

43

Channel Table ChangHong

Exit Menu

Use 【P+】and 【P-】keys on remote control to make up or down option, and use【V+】
and【V-】keys to set.

Contents of sub pages：

Panel Control

Setting item Setting value Remark
LVDS Mapping 0x09 Polarity of LVDS signal
SSC Off
SSCDELTA 00

Factory Setting

Setting item Setting value Remark
Model Type Asian(Europe)
Tuner Select Asian Tuner(Eu Tuner)
Sound system BG(I,,DK,L,M)
AutoDetsoundSys On(Off)
overmodulation On(Off)
IIR Big/Small
Factory Out >> Output the factory settings

System Control

Setting item Setting value Remark
Default Lang English Default OSD language
EQ Enable On(Off)
Aging Mode On(Off)
Logo On(Off)
TV_ANSTEREOSYS 01
TV_DISSTEREOSYS_FM 04
TV_DISSTEREOSYS 01
TV_DIDUALSYS_FM 04
TV_DIDUALSYS 06
TV_FMSYS 02
HDMI_I2CSYS 83
OTHER_LRSYS C1

Min/Max Control

Setting item Setting value Setting item Setting value
Con Min 30H Vol Min 00H
Con Mid 70H Vol Mid 1 01H
Con Max A2H Vol Mid 2 14H
Bri Min 00H Vol Mid 3 28H
Bri Mid 88H Vol Mid 4 4BH
Bri Max A2H Vol Max 64H
Col Min 00H Tre Min 00H
Col Mid 40H Tre Mid 30H
Col Max 70H Tre Max 60H

44

Tnt Min 20H Bas Min 00H
Tnt Mid 80H Bas Mid 30H
Tnt Max E0H Bas Max 60H
Shp Min 00H
Shp Mid 60H
Shp Max A0H

White Balance

Normal Warm
R Gain 7DH R Gain 7DH
G Gain 80H G Gain 80H
B Gain 9AH B Gain 9AH
R Offset 80H R Offset 84H
G Offset 80H G Offset 80H
B Offset 74H B Offset 74H
Cool
R Gain 7DH
G Gain 80H
B Gain 9AH
R Offset 80H
G Offset 80H
B Offset 90H

Hotel Option

Setting item Setting value Remark

Hotel mode presetting（On——users can

Hotel Enable ON

enter into Hotel mode，Off——users can’t
enter into Hotel mode）

Source Select

TV ON SVIDEO2 OFF
AV1 ON SVIDEO3 OFF
AV2 ON COMP1 ON
AV3 ON COMP2 ON
SCART1 OFF COMP3 OFF
SCART2AV OFF PC ON
SCART2YC OFF HDMI1 ON
SCARTAV3 OFF HDMI2 ON
SVIDEO ON YCBCR OFF

EnterISP

Enter software upgrading mode.

Channel Table

Presetting TV channel ,only for factory test.

Exit Menu

Notes：
A. In“Min/Max CONTROL” setting item, “Bri Mid”item is used to set sub-brightness of
picture;

45

B. White balance needs to be set in “Normal”mode;
C. Set CLEAR E²PROM will clear the memory data, So do not set it unless it is needed;
other setting items do not need setting.

2. Setting method of factory menu
⑴ Choose setting item
Operators can choose setting item orderly with【P+】and【P-】key, font having background

display represents the item has been chosen. Press【V+】key to enter sub directory. Use

【P+】and 【P-】keys on remote control to make up or down option, and use【V+】and
【V-】keys to set.

(2)All the menu functions are opened in factory mode, item checking and effect testing

can be done by using menu if it is needed.

(3)Switching TV signal in factory mode can be done by directly pressing the number key.
Press【MENU】key to back to the parent of working directory, press【DISPLAY】key to quit

factory mode.

46

Appendix ：LS02/PS02 module Circuit Schematic Diagram

47

48

49

50

51

52

53

54

55

56

57