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Summary of Contents for Akai LTA-26C904
- Page 1 LCD TV Model: LTA-26C904 LTA-32C904 SERVICE MANUAL www.akai.ru...
- Page 2 Chapter1 Characteristic of LSO1 core and the constitution of the whole machine ..........................2 Chapter2 Function introduction of ICs or functional module of Akai LCD TV with LS01core ....................7 Chapter3 Whole Machine Signal Processing Analysis and Measured Data at the Key Points ................
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Page 3: Chapter 1 Characteristic Of Lso1 Core And The Constitution Of The Whole Machine
Plug and Play in real sense 3. Circuit constitution of the whole machine Akai LCD TV with LS01 core is made up of switch power, system control circuit, video processing circuit, audio processing circuit, sound power amplifier circuit, AV input circuit, LCD screen module. - Page 4 2). American and Asian market:...
- Page 6 4. Introduction of printed board module Akai LCD TV with LS01 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.
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Page 7: Chapter 2 Function Brief Introduction Of Main Ics Of Lcd Tv With Ls01 Core
Chapter 2 Function brief introduction of main ICs of LCD TV with LS01 core 1. Main ICs and functional modules of Akai LCD TV with LS01core Item no. Model Main function High frequency head, output sound and image JS-6H2/121 video signal... - Page 8 2. Function introduction of ICs or functional module of Akai LCD TV with LS01core 1.Hign frequency head(JS-6H2/121) Pin No. Definition of pin Function description No connection No connection +5V power IIC bus (clock) IIC bus (data) Ground Ground No connection...
- Page 9 ● Multi-image browse mode Pin function description: Pin No. Designation of pin Function of pin Analog signal input/output terminal CVBS1 CVBS1 input Y_G1 Y input terminal Y_G2 SCART1 green base color input terminal Y_G3 S terminal brightness signal input terminal PC_G PC green base color input PR_R1...
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Page 10: Test Mode
IIC bus（clock） IIC bus（data） GPIO0 GPIO1 selection signal GPIO1 GPIO2 selection signal CPU write signal CPU read signal CPU chip selection signal（low level effective） INTN Interrupt signal（low level effective） Address latch signal RESET Reset signal (high level effective) V5SF SF Power（+5V） DP_HS Line synchronization signal DP_VS... - Page 11 RAS# RAS signal CAS# CAS signal Memory write drive CLKE Memory clock signal drive CS0# Memory chip selection signal Memory clock signal ┆ ┆ ┆ ┆ MD15 Memory data interface MD16 ┆ ┆ MD23 MD24 ┆ ┆ MD31 LVDS port LVDS_VDDP LVDS channel power PLL_GND...
- Page 12 VDDC VDDC VDDC VDDC VDDC VDDC VDDC VSSC VSSC VSSC VSSC VSSC VSSC VSSC Digital ground VSSC VSSH VSSH VSSM VSSM VSSM VSSM AVDD3_ADC2 ADC module power (+3.3V) AVDD3_ADC1 PLF2 Video PLL clock low pass filtering MLF1 Memory PLL clock low pass filtering PAVSS2 PLL ground PAVDD2...
- Page 13 AVDD3_BG_ASS Analog ground AVSS_BG_ASS SVP-CX32LF internal block diagram: 3．T5BS4-9999 brief introduction: T5BS4-9999 is a 16-bit high-speed micro-controller that is used for the control of a variety of small to large devices. T5BS4-9999 could extend ROM and is an IC with 64 pins and is packaged in PLCCC.
- Page 14 ● 1-channel IIC bus mode serial interface ● 4-way 10 bit A/D conversion interface ● Clock monitor ● Real time control clock ● 4 chips selection/wait controller ● 34 interrupt signals output 9 CPU interrupt, 21 internal interrupt, 4 external interrupt ●...
- Page 15 P73/TA4IN +5V power P74/TA5OUT Backlight on/off control P80/TB0IN0/INT5 Remote control signal P81/TB0IN1/INT6 +1.8V power supply P82/TB0OUT0 Remote red control signal P83/TB0OUT1 Remote green control signal P90/TXD0 Digital ground P91/RXD0 HDMI identity signal P92/SCLK0/ No connection CON4(10 pin) CON4(4 pin) CON4(3 pin) Bus byte selection DVCC...
- Page 16 P51/AN1 P52/AN2 SCART1 interface FS signal P53/AN3/ SCART2 interface FS signal AVCC Analog power （+3.3V） T5BS4-9999 internal functional block diagram： 4．STV-8217/STV-8218 brief introduction STV-8217/STV-8218 is capable of following functions:...
- Page 17 ■ Full-Automatic Multi-Standard Demodulation ● B / G / I / L / M / N / D / K Standards ● Mono AM and FM ● FM 2-Carrier and NICAM/BTSC ■ Sound Processing: Loudspeaker ● ST royalty-free processing: ST WideSurround, ST OmniSurround (Virtual Dolby Surround and Virtual Dolby Digital compliant) and ST Dynamic Bass...
- Page 18 VCC_NISO NISO polarization voltage（+3.3V） GND_SA DACS ground VSS33_CONV DAC ground VDD33_CONV DAC power (+3.3V) SC3_IN_L SCART3 left audio input SC3_IN_R SCART3 right audio input SCL_FLT SCART left channel filtering SCR_FLT SCART right channel filtering LS_C No connection LS_L Loudspeaker left channel output LS_R Loudspeaker right channel output LS_SUB...
- Page 19 VCC18_CLK1 5V regulated output GND18_CLK1 Ground GND18_CLK2 Ground VCC18_CLK2 +1.8V Power VSS33_IO2 Digital ground VDD33_IO2 +3.3V Power I2S_PCM_CLK No connection I2S_SCLK I²S clock I/O channel1,2,3 I2S_LR_CLK I²S selection signal input/output I2S_DATA0 I²S bus data input/output stereo channel 1 I2S_DATA1 I²S bus data input stereo channel 2 I2S_DATA2 I²S bus data input stereo channel 3 VDD18...
- Page 21 STV-8218 internal block diagram: 5．TDA8944J brief introduction: TDA8944J is a dual channel sound power amplifier, with each channel has 7W power output (the resistance of the loudspeaker is 8Ω) to drive the loudspeaker; When music is played, its high efficiency could reduce external heat dispersion and the requirement of the power supply equipment.
- Page 22 ● High integration ● Standby and mute mode ● No switch switching noise ● 12V Power filtering ● Low working current ● Output current short-circuit grounding protection ● Overheat protection ● Linear output to drive external earphone, PC and portable audio equipment Pin introduction: Designation Function description...
- Page 23 6. ANX9011L brief introduction: ANX9011L is a processor used for HDMI (high definition multimedia interface) signal reception processing, and is used in digital TV, platform screen TV, and projection equipment. It receives the HDMI input data series and decodes them into digital audio and digital video signal. ANX9011L could input and output 8 channels digital audio channel of 192kHz sampling frequency, it has 128 pins with LQFP packaging and has a build-in HDCP, which could greatly reduce design complexity and system cost.
- Page 24 Pin function Designation Function description Digital image output terminal VDE23 ┆ ┆ VDE19 VDE18 ┆ ┆ VDE16 ┆ ┆ 24bit（DP0~DP23）digital video output data bus VDE12 VDE11 ┆ ┆ VDE4 VDE3 ┆ ┆ VDE0 VDO23 ┆ ┆ VDO20 VDO19 ┆ ┆ VDO16 VDO15 ┆...
- Page 25 IIS_SCK IIS bus clock IIS_WS IIS signal selection IIS_SD0 IIS bus data ┆ ┆ IIS channel selection (no connection) IIS_SD3 SPDIF （no connection ） MUTEOUT Mute control signal (no connection ) Control signal port Interrupt request output RESETN Reset signal input DDC_SCL DDC Clock signal DDC_SDA...
- Page 26 7. 74HCT4052D brief introduction: 74HCT4052D is a 4-channel bi-directional analog multiplexer and multi-channel output selector. Each multi-channel output selector has 4 independent input/output terminals and 1 common input/output terminal. It is often used in analog and digital multiplexing, and multi-channel output selecting circuit and signal control system. Its main features are: ●...
- Page 27 SCART2 right audio input PC right audio input Right audio output AV right audio input HD terminal right audio input +5V Power 74HCT4052D internal block diagram:...
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Page 28: Chapter 3 Whole Machine Signal Processing Analysis And Measured Data At The Key Points
Chapter 3 Whole Machine Signal Processing Analysis and Measured Data at the Key Points This chapter Mainly introduces the receiving and processing of image signal and sound signal, whole machine system control process, and whole machine power supply system (Model of LTA-32C904 is taken as an example, other models is similar and will not be explained here for each. - Page 29 R206 SVP-CX32 Pin 177,178,186,193 CX_VA18 2.2mA Sil9011 1.8V Pin 12, 24, 36, 51, 66, FB27 81, 82, 112, 125 R3,R4 CX_VL18 SVP-CX32 1.8V R213 FB1,FB2 Pin 200,202,208,3 Sil9011 Pin 7, 19, 31, 68, 77, 98, 107, 120 Pin 47, 86, 87 FB26 FB29 Sil9011...
- Page 30 Y4 27MHz XO voltage 74HCT4052D Pin 16 FB12 Starting up mute circuit JS-6B2/121 Tuner Pin 3 FB16 FB24 JS-6B2/121 Tuner Pin 13 FB17 +5V（voltage of line to screen）CON1 Pin 1,2,3,4 (used by FB20 screen less than 32 inches) R232 Sil9011 Pin 44 R198 Back light switch control...
- Page 31 (3) Pin level schedule for Voltage regulators on mainboard Position Component model Pin 1(V) Pin 2(V) Pin 3(V) number U18、U22 AZ1117H-1.8TRE1 1.8V 3.3V U19、U24 AZ1117H-3.3TRE1 3.3V AZ1084S-3.3TRE1 3.3V AZ1084S-1.8TRE1 1.8V 3.3V AZ78L08ZTR-E1 (4) Pin sequence of power cord of power panel Position Pin definition Pin function discription...
- Page 33 (1) Socket definition Serial Position Connecting object Function description number number CON40 Power panel GND，GND，+12V，+12V CON11 Power panel +12V，+12V，+12V，GND，GND，GND，+5V， +5V，+5V，+5V，+5V CON13 Back light control line GND，GND，back light switch control，back light brightness control CON14 Keyboard +3.3V、GND、KEY1、KEY2 CON17 Remote control +3.3V、REMOTE、GND、indicator1、indicator1 receiving board CON4 Standby CON5...
- Page 34 Video decoding, image processor, A/D and SVP-CX32LF D/A conversion SST39VF040-70-4C-N Flash MEMORY ， storing whole machine control program T5BS4-9999 MCU，mainly control IC Address latch，for latching and extending the 74ALVC573PW address line U18、U21、U22 AZ1117H-1.8TRE1 3.3V to 1.8V DC-DC Converter AZ1084S-3.3TRE1 5V to 3.3V DC-DC Converter U19 、U24 AZ1117H-3.3TRE1 5V to 3.3V DC-DC Converter...
- Page 35 (3) RF inputting color bar signal, I²C bus clock signal SDA, pin 2, 3 of U31, pin 5 of U16, pin 40 of U35, pin 57 of U4, pin 39 of U30, pin 58 of U1, pin 5 of tuner U15: (4)RF inputting grey signal, Composite Video Signal waveform at pin 14 of tuner U15, the waveform at pin 169 of U1（SVP-CX32LF）...
- Page 36 (5)RF inputting white signal, SIF Signal waveform at pin 11 of tuner U15, and waveform at pin 73 of sound effect processing IC Stv-8217: (6)RF inputting white signal, and inputting sound signal with 1KHz frequency, inductance waveforms at pin 28, 29 of U35, and waveform of L26,L27:...
- Page 37 (7)Inputting sound signal with 1KHz frequency, with the processing of U33 and power amplifier TDA8944J, waveform at pin 1, 4, 14, 17 of U33, and waveform at CON13 speaker and CON14earphone output interfaces:...
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Page 38: Chapter 4 Familiar Problem And Processing
Chapter 4 Familiar Problem and Processing 1．Failure phenomenon：The picture is normal，but OSD has line in it. The reason and the processing：Check the pin of U2 and pin 80-160 of U1 for pseudo soldering, and have pseudo soldering touched up. 2． Failure phenomenon： There is sound but no picture; there is no OSD when start up; and the back light is bright. -
Page 39: Chapter 5 Listing Of Repair And Easily Damaged Parts
Chapter 5 Listing of Repair and Easily Damaged Parts 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. (32 inches series is taking as example) Proportion of easy Number Name... -
Page 40: Min/Max Control
Chapter 6 Factory Mode Setting and Items Needs Attention 1. Enter factory menu Power on TV set, and make LCD at working state: ① Press 【MUTE】 key on remote control； ② Press “MENU” key on remote control, and switch to “SOUND” option with 【V+】,【V-】key；... - Page 41 LOGO Logo switch LOGO display contents， “V+” 、 “V-” for choosing setting position,， “P+” 、 “P-” Logo Edit Akai for choosing letter ， including 52 English big/small letters together Logo Colour Logo colour Modified according to user’s require Min/Max Control...
- Page 42 Bri Min Vol Mid 3 Bri Mid Vol Mid 4 Bri Max Vol Max Col Min Tre Min Col Mid Tre Mid Col Max Tre Max Tnt Min Bas Min Tnt Mid Bas Mid Tnt Max Bas Max Shp Min Shp Mid Shp Max White Balance...
- Page 43 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.
- Page 44 Appendix 1 LS01 module（taking LTA-32C904 for example）Schematic Diagram...
- Page 50 Appendix 2 Power Module Schematic Diagram...
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