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Akai LTA-32N658HCP, Service Manual, Page: 30 / 58

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Akai LTA-32N658HCP Service Manual Download Page 30

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

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Summary of Contents for LTA-32N658HCP

Page 1: ...LTA 32N658HCP LTA 32N680HCP LTC 26N680HCP LTC 32N680HCP...

Page 2: ...LCD COLOUR TV SERVICE MANUAL MODEL LTC 26N680HCP LTC 32N680HCP LTA 32N680HCP LTA 32N658HCP CHASSIS NO LS02 PS02 1...

Page 3: ...Please read this manual carefully before service 2...

Page 4: ...ion of Main IC U 7 UChapter3 Analysis of Signal process Flowchart and key point measure dateU 31 UChapter4 Maintenance Procedure and Examples of Typical troubleshootingU 40 UChapter5 Spare Part ListsU...

Page 5: ...o 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...

Page 6: ...Lin2 Rin2 Lo2 R02 V1 R1 L2 Y1Pb1PR1 L3R3 8Mx16DDR Speaker Y C 19 L3 Pb1 R2 TUNER SCART2 SVP_AX32 AMP L1 I O Flash 1 R3 Y1 RO1 VO1 HDMI Headphone Pb1 RS232 PS301 Y1 V1 RGB FS1 FB1 Vout1 V3 S Video Lin...

Page 7: ...tput it has Scart S Video AV YPbPr HDMI and PC interface Tuner input sound demodulation sound processing sound power amplifier and online update 2 Remote reception module The remote reception board mo...

Page 8: ...2FTP 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 wavef...

Page 9: ...cement 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 h...

Page 10: ...ext 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...

Page 11: ...10...

Page 12: ...11...

Page 13: ...Table2 Pin Assignments for Analog Support Interface Table3 Pin Assignments for Analog Input Interface Table4 Pin Assignments for Capture Interface TV RGB 12...

Page 14: ...Table5 Pin Assignments for Frame Buffer Memory Table6 Miscellaneous Pin Assignments 13...

Page 15: ...Table7 LVDS Output Pin Assignments Table8 HDMI Interface Pin Assignments Table9 Analog Audio Input Output Interface Pin Assignments 14...

Page 16: ...Table10 Digital Audio Interface Pin Assignments Table11 Pin Assignments for Power and Ground 15...

Page 17: ...16...

Page 18: ...lows 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...

Page 19: ...e 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 Year...

Page 20: ...uction W25X80 VSSIG main features Family of Serial Flash Memories 8M bit 1M byte 1 048 576 256 bytes per programmable page Uniform 4K byte Sectors 64K byte Blocks SPI with Single or Dual Outputs Clock...

Page 21: ...Wide Temperature Range Single 2 7 to 3 6V supply 5mA active current 1uA Power down typ Software and Hardware Write Protection White Protect all or portion of memory Enable Disable protection with WP...

Page 22: ...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 ad...

Page 23: ...trobes 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...

Page 24: ...Pin introduction 23...

Page 25: ...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 Int...

Page 26: ...quency 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 c...

Page 27: ...TDA9886T internal block diagram 26...

Page 28: ...0W 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...

Page 29: ...4A 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 ra...

Page 30: ...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 MUT...

Page 31: ...TDA7266SA internal block diagram 30...

Page 32: ...t 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 demodul...

Page 33: ...WER CON11 PIN 8 7 6 5 U22 AP1513 1 2V 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 R400 262mA IF amplify circuitry 5V_ Sound surf...

Page 34: ...B11 5V CON11 PIN 8 7 6 5 DDR power supply U7 PIN 1 3 9 15 18 33 55 61 U19 change into2 5V U22 IC stabilivolt 1 2V MCU U1 PIN 230 MCU PIN 23 83 100 122 151 169 233 244 MCU ADC power supply PIN 32 40 47...

Page 35: ...3 U6 power supply PIN 2 U24 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...

Page 36: ...5V U23 AZP1122EL GND 1 2V 5V U24 AP1117E33 GND 3 3V 5V 3 Pin sequence of power cord of power panel Position number Pin Pin description 1 12VA 2 12VA 3 GND CON1 4 GND 1 5V SB 2 3 7 8 GND 4 5 5V 6 5V S...

Page 37: ...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 numbe r Position number component Function description A U1 S...

Page 38: ...IF and video signal 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...

Page 39: ...al 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...

Page 40: ...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...

Page 41: ...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 televis...

Page 42: ...Connect the signal cable correctly Blue screen AV or SVIDEO is displayed There is no signal input or the video cable is not connected or incorrectly connected Connect the video cable correctly Picture...

Page 43: ...ber 15BProportion of easy damage 1 Main Board 1 2 Remote receiving board part 0 5 3 Keyboard part 0 5 4 Inner power module FSP205 4E03 JSK4200 014 Inner power module 6B5 5 LCD screen LG PHILIPS LCD sc...

Page 44: ...ssis 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 Cont...

Page 45: ...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_A...

Page 46: ...0H Hotel Option Setting item Setting value Remark Hotel Enable ON Hotel mode presetting On users can enter into Hotel mode Off users can t enter into Hotel mode Source Select TV ON SVIDEO2 OFF AV1 ON...

Page 47: ...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 funct...

Page 48: ...Appendix LS02 PS02 module Circuit Schematic Diagram 47...

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