Akai LTA-26C904 Service Manual Download Page 24

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Pin function
Pin

Designation

Function description

Digital image output terminal
92 VDE23

┆

96 VDE19
99 VDE18

┆

101 VDE16

┆

105 VDE12
108 VDE11

┆

117 VDE4
121 VDE3

┆

124 VDE0

24bit

（

DP0~DP23

）

digital video output data bus

2 VDO23

┆

5 VDO20
8 VDO19

┆

11 VDO16
14 VDO15

┆

17 VDO12
20 VDO11

┆

23 VDO8
26 VDO7

┆

29 VDO4
32 VDO3

┆

35 VDO0

24bit

（

QO0~QO23

）

no connection

119

VD_CLK

Video output data clock

127

Video output data effective level signal

128

HSYNC

Line synchronizing signal

VSYNC

Field synchronizing signal

Digital audio output terminal

85 XTAL_IN
84 XTAL_OUT

Crystal oscillator interface

MCLKOUT

Audio main control clock output

Summary of Contents for LTA-26C904

Page 1: ...SERVICE MANUAL Model LTA 26C904 LTA 32C904 www akai ru LCD TV...

Page 2: ...e Machine Signal Processing Analysis and Measured Data at the Key Points 27 Chapter4 Familiar Problem and Processing 37 Chapter5 Listing of Repair and Easily Damaged Parts 38 Chapter6 Factory Mode Set...

Page 3: ...by state after 5 minutes in TV no signal state Program reserve function Capable of reserving 5 sets program jumping time if time is up to the reserved time automatically jump to the corresponding prog...

Page 4: ...3 2 American and Asian market...

Page 5: ...4...

Page 6: ...minal AV terminal Ypbpr HDMI and PC interface Tuner input sound demodulation sound effect treatment sound power amplifier and online upgrade of program 2 Remote reception board module The remote recep...

Page 7: ...B713 Hardware reset IC of MCU 9 U9 74HCT4052D Audio input switch of AV terminal 10 U35 STV 8217 STV 8218 Audio signal processor 11 U14 74LVC14AD VGA line and field synchronizing signal waveform shapin...

Page 8: ...ule 8bit LVDS transmission interface digital comb filter module and 3D digital comb video decoding are available Such functions as video enhancement OSD and VBI Closed Caption and teletext LEVEL 2 5 a...

Page 9: ...196 PB_B1 DVD interface Pb signal input 197 PB_B2 SCART1 blue base color input terminal 198 PB_B3 SCART1 CVBS signal input terminal 199 PC_B PC blue signal input 171 FS1 No connection 170 FS2 No conn...

Page 10: ...l 23 DP_CLK Clock signal 6 DP_DE_FLD DE I O terminal 64 ADDR0 71 ADDR7 CPU address R0 R7 signal 83 A_D0 76 A_D7 CPU address data passage MISC port control signal 162 CVBS_OUT2 SCART2 interface CVBS si...

Page 11: ...ory data interface LVDS port 52 LVDS_VDDP LVDS channel power 38 PLL_GND PLL ground 39 PLL_VCC PLL power 47 LVDSGND LVDS ground 46 LVDSVCC LVDS channel power 43 TCLK1M 41 TCLK1P High low differential c...

Page 12: ...F1 Memory PLL clock low pass filtering 1 PAVSS2 PLL ground 3 PAVDD2 PLL power 1 8V 206 PAVSS1 PLL digital ground 208 PAVDD1 PLL digital ground power 1 8V 203 PAVSS PLL Digital ground 202 PAVDD PLL dig...

Page 13: ...d extend ROM and is an IC with 64 pins and is packaged in PLCCC It is the main control IC of the TV and implements I C bus control of the overall system Main features 900 L1 CPU 16bit high speed CPU 9...

Page 14: ...O pins Reserved wait function Clock control fs 32 768KHz real time time of time conversion function high frequency fc to fc 16 Working voltage When fc 27 MHZ VCC 2 7 3 6V when fc 10MHZ VCC 1 8V to 3 6...

Page 15: ...trol port 24 P96 XT1 Low frequency oscillation input interface 25 P97 XT2 Low frequency oscillation output interface 26 NMI Interrupt request signal 27 ALE Address latch level 28 P00 AD0 35 P07 AD7 0...

Page 16: ...CART1 interface FS signal 63 P53 AN3 SCART2 interface FS signal 64 AVCC Analog power 3 3V T5BS4 9999 internal functional block diagram 4 STV 8217 STV 8218 brief introduction STV 8217 STV 8218 is capab...

Page 17: ...ion Pin Designation Function description 1 SC1_OUT_L SCART1 left audio output 2 SC1_OUT_R SCART1 right audio output 3 VCC_H 8V power 4 GND_H ground 5 SC3_OUT_L SCART3 left audio output 6 SC3_OUT_R SCA...

Page 18: ...ction 32 HP_LSS_R No connection 33 VSS18_CONV DAC ADC ground 34 VDD18_CONV DAC ADC power 8V 35 HP_DET Earphone connection test terminal 36 ADR_SEL Chip address selection signal 37 VSS18 Digital ground...

Page 19: ...s data input stereo channel 2 65 I2S_DATA2 I S bus data input stereo channel 3 66 VDD18 1 8V Power 67 VSS18 Ground 68 BUS_EXP Bus extension selection 69 IRQ No connection 70 GND_PSUB Ground 71 VDD18_A...

Page 20: ...19...

Page 21: ...al channel sound power amplifier with each channel has 7W power output the resistance of the loudspeaker is 8 to drive the loudspeaker When music is played its high efficiency could reduce external he...

Page 22: ...tput terminal 1 2 GND1 Ground 3 VCC1 12V Power 4 OUT1 Loudspeaker positive output terminal 1 5 N C No connection 6 IN1 Positive pole input terminal 1 7 N C No connection 8 IN1 Negative pole input 1 9...

Page 23: ...omplexity and system cost Its main features are Support up to 165MHz HDMI data rate Suitable for HDMI 1 1 HDCP 1 1 and DVI 1 0 format Support 20m connection cable Support multi format video processing...

Page 24: ...s 2 VDO23 5 VDO20 8 VDO19 11 VDO16 14 VDO15 17 VDO12 20 VDO11 23 VDO8 26 VDO7 29 VDO4 32 VDO3 35 VDO0 24bit QO0 QO23 no connection 119 VD_CLK Video output data clock 127 DE Video output data effective...

Page 25: ...I C connection detection signal 44 HDMI_5V Cable insert detection terminal 88 RESDL Ground 43 NC 45 NC No connection HDMI input terminal 51 HDMI_CLKP 50 HDMI_CLKN Differential clock input 55 HDMI_D0P...

Page 26: ...tput selecting circuit and signal control system Its main features are 5V to 5V widely range Power input Low on resistance Logical level alternating Build in interrupt before running In line with JEDE...

Page 27: ...0 S0 11 1Y3 SCART2 right audio input 12 1Y0 PC right audio input 13 1Z Right audio output 14 1Y1 AV right audio input 15 1Y2 HD terminal right audio input 16 VCC 5V Power 74HCT4052D internal block dia...

Page 28: ...e and PC Audio are first sent into 74HCT4052D for choosing passages and then sent into STV 8217 for demodulation and sound effect processing The output audio signal of STV 8217 is sent into power ampl...

Page 29: ...107 120 Pin 47 86 87 FB20 2575mA U18 AZ1117H 1 8TRE1 U20 AZ1084S 3 3TRE1 3 3V U30 Sil9011 Pin 49 53 57 61 U30 Sil9011 pin 87 86 U1 SVP CX32 Pin 19 72 U1 SVP CX32 Pin 46 39 52 U1 SVP CX32 Pin 155 156...

Page 30: ...1 2 3 4 used by screen less than 32 inches 5V_SB CON12 Pin1 2 IIC Bus data interface IIC Bus clock interface CON4 CON 15 CON 16 Pin 2 3 J3 VGA terminal interface voltage U1 SVP CX32 Pin 85 D7 8 BAV99L...

Page 31: ...21 AZ1084S 1 8TRE1 GND 1 8V 3 3V U23 AZ78L08ZTR E1 12V GND 8V 4 Pin sequence of power cord of power panel Position number Pin Pin definition Pin function discription 1 ON OFF L OFF H ON 2 3 GND GND 4...

Page 32: ...31...

Page 33: ...ON12 Power panel 5V_SB 5V_SB GND GND Power supply control 11 CON13 Standby 12 CON8 Standby 13 CON9 Speaker L L R R 14 CON10 Side AV board 15 J9 VGA audio signal input 16 J8 SCART2 input 17 J5 SCART1 i...

Page 34: ...S4344 CZZ HDMI digital audio decoding and D A conversion P U30 ANX9011L HDMI decoding HDTV video audio reproduction Q U25 AT24C02BN 10SU 1 8 EEPROM R U28 U29 Rclamp0514M TBT HDMI signal ESD protective...

Page 35: ...ck 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...

Page 36: ...nal 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...

Page 37: ...6 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 interface...

Page 38: ...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 be failure 4 Failure phenomenon L...

Page 39: ...0 1 2 Back cover JUG6 116 624 0 1 3 Mount part JUJ7 356 005 0 1 4 Mainboard part JUG6 690 106 Print plate JUG7 820 015 1 5 Remote receiving board part JUG6 695 028 Print plate JUG7 820 016 0 5 6 Keybo...

Page 40: ...e and Version LSE01 M32 V1 05WL 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 Remark IIC Of...

Page 41: ...item Setting value Remark Setting item Setting value Default Lang English Default OSD language SSC L L AGC 5 L L sound AGC Delta 0 OverModulation On Off OverModulation switch Positive 6 PreScl SCART...

Page 42: ...Offset 90H Hotel Option Setting item Setting value Remark Hotel Mode Enable No Hotel mode presetting Yes for Hotel Mode No for normal TV mode Force Pos 1 Forced program number Force Video ext1 Forced...

Page 43: ...emote 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 Swi...

Page 44: ...43 Appendix 1 LS01 module taking LTA 32C904 for example Schematic Diagram...

Page 45: ...44...

Page 46: ...45...

Page 47: ...46...

Page 48: ...47...

Page 49: ...48...

Page 50: ...49 Appendix 2 Power Module Schematic Diagram...

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