Akai LTA-26C902 User manual

www.akai.ru
Models:
LTA-26C902
LTA-32C902
LTA-37C902

2

4
Energy Saving Mode if there is no signal input.
●Multi Language On-Screen Display menu
Ordinary and graphical user interface makes the menu operation more user-friendly
●Power Energy Saving Mode (power management mode)
In PC mode, the LCD TV will automatically power off within 30 seconds and enter into the Power
Energy Saving Mode if there is no VGA signal input. It will automatically exit from the Power Energy
Saving Mode and work again when it received a valid VGA signal or press any button on the
panel/remote control.
●Plug and Play
It is no need to equip any installation software when the product is used as computer terminal display
equipment
●Legerity, convenience, low power consumption
●Digital Photo Album Function(Only for CHD-W260F8P/CHD-W270F8P/ CHD-W320F8P/
CHD-W370F8P)
●Built-in DVD Module（Only for CHD-TD260F8 /CHD-TD270F8/CHD-TD320F8/CHD-TD370F8）
⑴Entirely Compatible to DVD、SVCD、VCD、CD、MP3
⑵Compatible to PAL/NTSC Discs
⑶High quality digital audio coaxial input enable you to feel as if sit in the theatre with the perfect classical
hi-fidelity experience
⑷Automatically delete unsuitable parts according to the chosen play levels (max.8 )(only for DVD discs
with play level control)
⑸As many as 32 subtitles
⑹As many as 8 audios
Unit IC Compositions：
LS08 chassis LCD TV is mainly composed of regulator IC、RF IC、video processor IC、Power Amplify
IC、Analog Video IC、System Control IC and Key Control IC, see this IC frame as below:

5
PCB Assembly：
It is mainly composed of TV Board、Remote Control Receiver(Signal Receiver) 、Side AV Board、
K Board and Main Board. Hereunder function introduction to every PCB Assembly：
Numbe
r Parts Description
1 Main Board
Assembly
It is the core of signal processing for LCD TV, which takes responsibility of
transforming outer signal into the uniform digital signal identified by LCD display
with use of System Control IC. TV and AV signals input from TV Board are
decoded by UOCIII to transport RGB signal which is to be transformed by
TDA8759 modulus to transport 24bit RGB digital signal, then it is to be
transformed by GM1601/GM1501 to produce LVDS signal displayed on the
screen, in addition, signals input from VGA、DVI would directly enter into
GM1501 procedure 、format transformation and on screen display.

6
2 TV Board
Assembly
It is mainly composed of two tuners (main and sub tuners) 、AV/S 、HD signal
terminals and some peripheral processing IC. The main tuner demodulates RF
signal to IF signal, and the sub tuner produces CVBS signal, all signals are sent to
the main board after transfer.
3 Remote
Control
Receiver
Assembly
t
is composed of one indicator light and one remote control receiver, which enable
Users operate the TV conveniently and know its current working status simply with
a remote control..
4 Built-in Power
Board
Assembly
It can transform AC 220V into DC for ICs, including +24V，+12V，+5V and +5VS
power supply in standby mode.
5 K Board
Assembly
It consists of 7 function buttons by which users can operate the TV freely.
6 Screen
Assembly
Screens for LS08 have the built-in adverse transformer which change DC into high
voltage AC signal to lighten the back light; The LCD screen is used to display the
image after the image signal has been processed by the main board.
,
7 Side AV Board It is used for earphone output, AV input, S input

7
CHAPTER TWO MAIN ICs FUNCTION INTRODUCTION
GENERAL INTRODUCTION:
TV Board
Number Location Type Main Function
1 UT1 TMI4-C22P2RW Audio and image intermediate frequency signal
output
2 UT2 TAD5-C2IP1RW Sub picture CVBS signal output
Main Board
3 U302，U303 24LC21A T/SN EEPROM
4 U701 24LC32A T/SN Buffer
5 U306,U307,UA3 FSAV330QSCX Switch selection
6 K201 K7262N Audio surface filter
7 K202 K9352N Audio surface filter
8 U6 TPA3002D2PHPR Audio amplifier
9 U801 AM29LV800DT-70EC
Flash，control program inside
10 U700 GM1501-BD Video processor
11 U201 TDA15063H-N1B06557 AV decoder
12 U402 SAA7115HL/V1 Sub channel video decoder
13 U305 SM5302AS-G-ET High definition signal filter
14 U400 TDA8759HV/8/C1 Video signal modulus transformer
15 U5 TDA9178T/N1 Video signal picture amendment
16 U600 MT46V2M32LG-4 Frame buffer
.ICs FUNCTION INTRODUCTION IN DETAILS
Main Tuner (TMI4-C22P2RW)
Pin Definition Description
1 AGC Auto gain control
2 UT NC
3 ADD Ground
4 SCL IIC bus (Clock)
5 SDA IIC bus (Data)
6 NC NC
7 +5V Power supply
8 NC NC
9 30V To produce 0~30V tune voltage
10 NC NC
11 IF Intermediate frequency TV signal
Intermediate frequency TV signal
Sub Tuner (TAD5-C2IP1RW):
Pin Definition Description
1 AGC Auto gain control
2 NC NC

8
3 ADD Ground
4 SCL IIC bus (Clock)
5 SDA IIC bus (Data)
6 NC NC
7 +5V Power supply
8 NC NC
9 33V To produce 0~30V tune voltage
10 NC NC
11 IF Intermediate frequency output (NC)
12 IF Intermediate frequency output (NC)
13 SW0 Band control
14 SW1 Band control
15 NC NC
16 SIF NC
17 AGC Auto gain control
18 VEDIO CVBS signal output
19 +5V Power supply
20 AUDIO NC
GM1501
GM1501is a kind of processing chassis for dual channels image and video, which is mainly used for
LCD displays and integrative TV products. With the resolution of WUXGA, it not only supports PIP
technique, but possesses some IC functions applied to image catch 、process and clock display. It
integrates high velocity AD converter, PLL, high reliability DVI receiver, X86 series miccontrol and LCDS
inverter. See the features as below:
Main Features
●High quality image zoom function;
●Analog RGB signal input interface;
●Intelligent output signal auto identification;
●Integrated high-power PLL output;
●High-reliable self-adaptive DVI input interface;
●4:4:4/4:2:2/CCR656/601 8/16/24bit digital video interface;
●Embedded IC for adjustments of gain、contrast、brightness、color saturation、hue and fleshtone;
●Efficiency in reducing EMI electromagnetism inference;
●Inclined grain processing with small angle;
●High quality video processing;
●Programmable output format;
●Embedded LVDS transport;
●Advanced OSD;
●Embedded micro controller
Pin Description :
Pin Name Description
Analog Signal Input Port

9
L3 AVSYNC ADC vertical synchronization signal input
L4 AHSYNC ADC horizontal synchronization signal input
N2 VGA-SCL VGA lock input
N1 VGA-SDA VGA digital input
D1、D2 RED+、RED- Red analog signal input
C3 SOG Green synchronization signal
C1、C2 GREEN+、- Green analog signal input
B1、B2 BLUE+、BLUE- Blue analog signal input
A2,B3,E3,D3 ADC3.3 ADC3.3Vpower supply
A3，A4 ADC1.8 ADC1.8Vpower supply
A5，B4 ADC-DGND ADC digital ground
C4，D4，E1，E2，E4 ADC-AGND ADC analog ground
DVI Input Output Port
N4 DVI-SCL DDC interface , serial clock signal
N3 DVI-SDA DDC interface ，serial data signal
A6，B6 RXC+，RXC- DVI clock input signal
A8～A10
B8～B10
RX0+～RX2+
RX0-～RX2-
DVI input port
B11 REXT Exterior exit resistance
C6～C11 DVI-3.3 DVI 3.3V power supply
D6、D8～D10 DVI-1.8 DVI 1.8V power supply
A7,A11,B5,B7,C7,D7
D11
DVI-GND DVI ground
Low Bandwidth ADC Port
C13 LBADC-33 ADC3.3Vpower supply
A12，B12，C12 LBADC_IN1～
LBADC_IN3
ADC analog input channel
D12 LBADC_RETURN Channel analog ground
D13 LBADC-GND Power supply voltage analog ground
OCM IC Port
AA1~AA3,Y1~Y3,
W1~W3,V1~V4,
U1~U4,T1~T3
OCMADDR0～
OCMADDR19
Address input output port
AB1~AB3,AC1~AC3,
AD1~AD4,AE1~AE3,
AF1~AF3
OCMDATA0~
OCMDATA15
Data input output port
OCM Port Control Signal
R1，T4，P1，P2 ROM_CSn~
ROM_CS2n
Part selection signal
R2 OCM_REn Read enable signal
R3 OCM_WEn Write enable signal
L1
L2
OCM_INT2
OCM_INT1
Interrupt
M1 OCM_UDO OCM data output
M2 OCM_UDI OCM data input
D25 OCM_TIMER1 OCM timer input

10
Standard Definition Video Control Port
D16 SVCLK SV pels clock input
C14 SVHSYNC SV horizontal synchronization signal input
B14 SVVSYNC SV vertical synchronization signal input
A14 SVODD Scan status input
A17 SVDV SV data input
Standard Definition Video Data Port
D14,D15,A15,A16,
B15,B16,C15,C16
SVDATA7~
SVDATA0
SV ITU656 data input
Video Control Port
A20 VCLK Video pels clock signal
D19 VHS_CSYNC Video horizontal synchronization signal input
C20 VVS Video vertical synchronization signal input
B20 VODD Scan status input
D20 VDV (VSOG) Video data input
B17 VCLAMP Video clamp enable output
A21,A22,A23,B21,
B22,C21,C22,D21
VGRN7~ VGRN0 Green signal or Y signal input
C17,C18,C19,A18
A19,B18,B19,D18
VRED7~ VRED0
Red signal or V/Cr/Pr signal input
B23,B24,B25,A24
A25,C23,C24,D24
VBLU7~ VBLU0
Blue signal or U/Cb/Pb signal input
Screen Control Port
A26 PPWR Screen power control
B26 PBIAS Screen bias control
D26，C25，C26 PWM2 ~PWM0 Pulse width modulation output
AC7 DCLK Pels clock output
AC16 OEXTR Connect external LVDS bias resistance
LVDS Port
AE14~AE16,AE19~
AE23,AF13~AF16
AF19~AF23,AF11
A0-~A3-, A0+~A3+
B0-~B3-, B0+~B3+
Low voltage difference data input
AD14,AD11,AE13
AE11,AC11,AF10
LVDS_SHIELD[5] ~
LVDS_SHIELD[0]
Low voltage difference protect output
AE12,AF12,
AF20,AE20
AC+,AC-,BC+,BC- Low voltage difference protect input
Screen Port Power Supply
AD12,AD13,AC12 LVDSB_3.3 LVDS B channel power supply
AC13,AC14,AC15 LVDSB_GND B channel ground
AC20,AC21,AC22 LVDSA_3.3 LVDS A channel power supply
AD19,AC19,AC20 LVDSA_GND A channel ground
AE17 VDDD33_LVDS Analog power supply
AD17 VSSD33_LVDS Analog ground
Clock Composite and Power Supply
G4 XTAL crystal oscillator interface