Service Manuals, User Guides, Schematic Diagrams or docs for : Akai LTA LTA-26C902 & LTA-32C902 & LTA-37C902 LTA-26C902 & LTA-32C902 & LTA-37C902
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Models:
LTA-26C902
LTA-32C902
LTA-37C902
www.akai.ru
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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 ModuleOnly for CHD-TD260F8 /CHD-TD270F8/CHD-TD320F8/CHD-TD370F8
Entirely Compatible to DVDSVCDVCDCDMP3
Compatible to PAL/NTSC Discs
High quality digital audio coaxial input enable you to feel as if sit in the theatre with the perfect classical
hi-fidelity experience
Automatically delete unsuitable parts according to the chosen play levels (max.8 )(only for DVD discs
with play level control)
As many as 32 subtitles
As many as 8 audios
Unit IC Compositions
LS08 chassis LCD TV is mainly composed of regulator IC IC
RF video processor IC Power Amplify
ICAnalog Video ICSystem Control IC and Key Control IC, see this IC frame as below:
4
PCB Assembly
It is mainly composed of TV BoardRemote Control Receiver(Signal Receiver) Side AV Board
K Board and Main Board. Hereunder function introduction to every PCB Assembly
Numbe Parts Description
r
1 Main Board It is the core of signal processing for LCD TV, which takes responsibility of
Assembly 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 VGADVI would directly enter into
GM1501 procedure format transformation and on screen display.
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2 TV Board It is mainly composed of two tuners (main and sub tuners) AV/S HD signal
Assembly 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 t is composed of one indicator light and one remote control receiver, which enable
Control Users operate the TV conveniently and know its current working status simply with
Receiver a remote control..
Assembly
4 Built-in Power It can transform AC 220V into DC for ICs, including +24V+12V+5V and +5VS
Board power supply in standby mode.
Assembly
5 K Board It consists of 7 function buttons by which users can operate the TV freely.
Assembly
6 Screen Screens for LS08 have the built-in adverse transformer which change DC into high
Assembly 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
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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 U302U303 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 Flashcontrol 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
7
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 gaincontrastbrightnesscolor saturationhue 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
8
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
D1D2 RED+RED- Red analog signal input
C3 SOG Green synchronization signal
C1C2 GREEN+- Green analog signal input
B1B2 BLUE+BLUE- Blue analog signal input
A2,B3,E3,D3 ADC3.3 ADC3.3Vpower supply
A3A4 ADC1.8 ADC1.8Vpower supply
A5B4 ADC-DGND ADC digital ground
C4D4E1E2E4 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
A6B6 RXC+RXC- DVI clock input signal
A8A10 RX0+RX2+ DVI input port
B8B10 RX0-RX2-
B11 REXT Exterior exit resistance
C6C11 DVI-3.3 DVI 3.3V power supply
D6D8D10 DVI-1.8 DVI 1.8V power supply
A7,A11,B5,B7,C7,D7 DVI-GND DVI ground
D11
Low Bandwidth ADC Port
C13 LBADC-33 ADC3.3Vpower supply
A12B12C12 LBADC_IN1 ADC analog input channel
LBADC_IN3
D12 LBADC_RETURN Channel analog ground
D13 LBADC-GND Power supply voltage analog ground
OCM IC Port
AA1~AA3,Y1~Y3, OCMADDR0 Address input output port
W1~W3,V1~V4, OCMADDR19
U1~U4,T1~T3
AB1~AB3,AC1~AC3, OCMDATA0~ Data input output port
AD1~AD4,AE1~AE3, OCMDATA15
AF1~AF3
OCM Port Control Signal
R1T4P1P2 ROM_CSn~ Part selection signal
ROM_CS2n
R2 OCM_REn Read enable signal
R3 OCM_WEn Write enable signal
L1 OCM_INT2 Interrupt
L2 OCM_INT1
M1 OCM_UDO OCM data output
M2 OCM_UDI OCM data input
D25 OCM_TIMER1 OCM timer input
9
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, SVDATA7~ SV ITU656 data input
B15,B16,C15,C16 SVDATA0
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, VGRN7~ VGRN0 Green signal or Y signal input
B22,C21,C22,D21
C17,C18,C19,A18 VRED7~ VRED0 Red signal or V/Cr/Pr signal input
A19,B18,B19,D18
B23,B24,B25,A24 VBLU7~ VBLU0 Blue signal or U/Cb/Pb signal input
A25,C23,C24,D24
Screen Control Port
A26 PPWR Screen power control
B26 PBIAS Screen bias control
D26C25C26 PWM2 ~PWM0 Pulse width modulation output
AC7 DCLK Pels clock output
AC16 OEXTR Connect external LVDS bias resistance
LVDS Port
AE14~AE16,AE19~ A0-~A3-, A0+~A3+ Low voltage difference data input
AE23,AF13~AF16 B0-~B3-, B0+~B3+
AF19~AF23,AF11
AD14,AD11,AE13 LVDS_SHIELD[5] ~ Low voltage difference protect output
AE11,AC11,AF10 LVDS_SHIELD[0]
AE12,AF12, AC+,AC-,BC+,BC- Low voltage difference protect input
AF20,AE20
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
10
F2 VDDD33_PLL Digital power supply
H1 VDDD33_SDDS
J1 VDDD33_DDDS
G2 VSSD33_PLL Digital ground
J4 VSSD33_SDDS
K4 VSSD33_DDDS
F4 VDDA33_RPLL Analog power supply
G1 VDDA33_FPLL
H3 VDDA33_SDDS
J3 VDDA33_DDDS
F3 VSSA33_RPLL Analog ground
H4 VSSA33_FPLL
H2 VSSA33_DDDS
J2 VSSA33_DDDS
G3 TCLK Reference clock signal input
K2 ACS_RSET_HD External resistance port
System Signal
K1 RESETn Reset signal
M3M4 IR0IR1
P4 MSTR_SCL Main clock output signal
P3 MSTR_SDA Main data output/input signal
R4 EXTCLK External clock input
Frame Storage Interface
U24,U23 FSCLKp,FSCLKn Fine storage clock output
V24,V25 FSRAS,FSCAS Address output
V26 FSWE Write enable port
W26 FSCKE Read enable port
J24 FSVREF Reference voltage input
K26 FSVREFVSS Reference voltage ground
W25 FSVREF Reference voltage input
W24 FSVREFVSS Reference voltage ground
L26 FSDQS Data filter
F24~F26,G23~G26 FSDATA31~ Data input output port
H24~H26,J25,J26, FSDATA0
R24~R26,P24~P26
N23~N26,.......
T24,T25,U25,U26 FSDQM3~ FSDQM0 Data output mark
Y26 FSBKSEL1 Layer address
Y25 FSBKSEL0
AA24~AA26 FSADDR11~ Range address output
AB24~AB26, FSADDR0
AC24~AC26
AD24~AD26
E23, F23, H23, J23, FS_2.5 2.5V power supply
L23,M23,P23, R23,
T23,V23,W23,Y23,
11
AA23,AB23,AC23
K23 VDDA18_DLL 1.8V power supply
K25 VSSA18_DLL Power supply ground
Digit power supply
K10,K11,K16,K17, CORE_1.8 1.8V power supply
L11,L16,T11,T16,
T17,U10,U11,U16,U17
D23, W4,Y4, AA4, IO_3.3 3.3V power supply
AB4,AC4,AC6,D17,
D22,AC8,AC10
K12,K13,K14,K15, D_GND Power ground
L10,L12,L13,L14,
L15,L17,M10,M11,
M12,M13
A1ACD5AC17 NO_CONNECT NC
K3F1
GM1501Internal Diagram
TDA8759
TDA8759 is a triple 8-bit video converter interface. The IC converts a RGB analog signal into a 24bit
RGB or YUV or YCbCr digital signal , or converts a YUV or YCbCr analog signal into a YUV or RGB digital
signal with a sampling rate up to 81 Msps. The IC supports resolutions from 480i and VGA to HDTV and
XGA.
12
Main Features:
Triple 8-bit Analog-to-Digital Converter (ADC)
Three independent analog video sources up to 81 Msps selectable by I2C-bus
Auto check on interval scan video signal
1.8Vand 3.3Vsupplies
Low gain variation with temperature
Output format RGB 4:4:4, YUV 4:4:4, YUV 4:2:2 ,CCIR 656 or YUV 4:2:2 semi-planar standard on
output bus
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