Akai LTA-26C903 Service Manual
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Akai LTA-26C903 Service Manual

Akai LTA-26C903 Service Manual

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LTA-32C903
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Summary of Contents for Akai LTA-26C903

  • Page 1 Models: LTA-26C903 LTA-32C903 www.akai.ru...

  • Page 2: Table Of Contents

    CONTENTS CHAPTER ONE FEATURES AND COMPOSITIONS ..............1 Models for LS 08 Chassis ......................Main Features ..........................Unit IC Compositions ........................PCB Assembly ..........................CHAPTER TWO MAIN ICs FUNCTION INTRODUCTION ............GENERAL INTRODUCTION ..........................5 ICs FUNCTION INTRODUCTION IN DETAILS ....................5 ..........................

  • Page 3: Chapter One Features And Compositions

    CHAPTER ONE FEATURES AND COMPOSITIONS Models for LS08 Chassis： CHD-W260F8、CHD-W260F8P、CHD-TD260F8 CHD-W270F8、CHD-W270F8P、CHD-TD270F8 CHD-W320F8、CHD-W320F8P、CHD-TD320F8 CHD-W370F8、CHD-W370F8P、CHD-TD370F8 Main Features: Radio Frequency input; support CATV ● Capable of receiving the full-append cable programs in 470MHZ Two-way AV input ● Capable of receiving PAL, NTSC, SECAM color systems; Very convenient to watch VCR (video cassette recorder), Pickup Camera, other Disc’s programs AV output ●...

  • Page 4: Unit Ic Compositions

    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.

  • Page 5: Pcb Assembly

    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 Parts Description 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.
  • Page 6 It is mainly composed of two tuners (main and sub tuners) 、AV/S 、HD signal Board 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.

  • Page 7: Chapter Two Main Ics Function Introduction

    CHAPTER TWO MAIN ICs FUNCTION INTRODUCTION GENERAL INTRODUCTION: TV Board Number Location Type Main Function TMI4-C22P2RW Audio and image intermediate frequency signal output TAD5-C2IP1RW Sub picture CVBS signal output Main Board U302，U303 24LC21A T/SN EEPROM U701 24LC32A T/SN Buffer U306,U307,UA3 FSAV330QSCX Switch selection K201 K7262N...

  • Page 8: Gm150

    Ground IIC bus (Clock) IIC bus (Data) Power supply To produce 0~30V tune voltage Intermediate frequency output (NC) Intermediate frequency output (NC) Band control Band control Auto gain control VEDIO CVBS signal output Power supply AUDIO GM1501 GM1501is a kind of processing chassis for dual channels image and video, which is mainly used for LCD displays and integrative TV products.
  • Page 9 AVSYNC ADC vertical synchronization signal input AHSYNC ADC horizontal synchronization signal input VGA-SCL VGA lock input VGA-SDA VGA digital input D1、D2 RED+、RED- Red analog signal input 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...
  • Page 10 Standard Definition Video Control Port SVCLK SV pels clock input SVHSYNC SV horizontal synchronization signal input SVVSYNC SV vertical synchronization signal input SVODD Scan status input 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...
  • Page 11 VDDD33_PLL， Digital power supply VDDD33_SDDS VDDD33_DDDS VSSD33_PLL Digital ground VSSD33_SDDS VSSD33_DDDS VDDA33_RPLL Analog power supply VDDA33_FPLL VDDA33_SDDS VDDA33_DDDS VSSA33_RPLL Analog ground VSSA33_FPLL VSSA33_DDDS VSSA33_DDDS TCLK Reference clock signal input ACS_RSET_HD External resistance port System Signal RESETn Reset signal M3，M4 IR0，IR1 MSTR_SCL Main clock output signal MSTR_SDA...

  • Page 12: Tda8759

    AA23,AB23,AC23 VDDA18_DLL 1.8V power supply 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。 。 。 。 。 。 A1，AC，D5，AC17，...
  • Page 13 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；...
  • Page 14 4,14,22,30 OGND Video port output 38,46,165 ground 7，8，9，10， VPA0~VPA7 Video port A 15，16，17，18 11,116,130,132 VDDC Power supply port 12,117,159 CGND Ground 23~28,31,32 VPB0~VPB7 Video port B 35,36,39~44 VPC0~VPC7 Video port C 47,53,57,58,55 AGND Analog ground 60,66,70,71,75 81,83,85,86, 48,54,59,61,67 VDDA Power supply port 69,76,82,85,87,88 REFB/Pb Blue/blue-chrominance channel reference input...

  • Page 15: Tpa3002D2

    Horizontal synchronization input vertical synchronization input Color synchronization output ORR/V Red / chrominance ADC output ORB/U Blue /chrominance ADC output ORG/Y Green / chrominance ADC output Video dynamic indication output FREF Scan output VREF Vertical channel reference input TPA3002D2： The TPA3002D2 is a 9-W (per channel) efficient, Class-D audio amplifier for driving bridged-tied stereo speakers.
  • Page 16 (34) is a logic high, the MODE_OUT pin is driven low. When the MODE pin (34) is a logic low, the MODE_OUT pin is driven high. This pin is intended for MUTE control of an external headphone amplifier. Leave unconnected when not used for headphone amplifier control.

  • Page 17: Sm5301As

    SM5301AS ： order Butterworth lowpass filter configuration. The filter characteristics have been optimized for minimal overshoot and flat group delay, it has a variable cutoff frequency and guaranteed driver-stage channel gain difference and phase difference values. Main Features: ● supply voltage：5V±10%； ●...
  • Page 18 Description： Name Description GSG1 output buffer gain set input Analog G or U signal input. Sync signal is input on SYNCIN pin. Analog G or U signal input. Sync signal is input on SYNCIN pin. Analog B or V signal input. Sync signal is input on SYNCIN pin.

  • Page 19: Saa7115

    4,8,28 No connection(leave open or connect to ground) SAA7115： The SAA7115 is a video capture device for various applications ranging from small screen products like e.g. digital set top boxes, personal video recording applications to big screen devices like e.g. LCD projectors due to it’s improved comb filter performance and 10 bit video output capabilities.
  • Page 20 XTALI driven by an external single-ended oscillator. Input terminal for 24.576 (32.11) MHz crystal oscillator or connection of external oscillator with TTL compatible square wave clock signal. VXDD Crystal oscillator power supply 10,12,14,16 AI21~AI24 Analog signal input 21~24 AI2D differential input for ADC channel 2 (pins AI24, AI23, AI22, AI21) differential input for ADC channel 1 (pins AI12, AI11) AI1D AI11...

  • Page 21: Uoc (Tda15063H)

    IGP1 general purpose output signal 0; image-port (controlled by subaddr. “84”,”85”) general purpose output signal 1; image-port (controlled by subaddr. “84”,”85”), same functions as IGP0 IGPV multi purpose vertical reference output signal; image-port (controlled by subaddr. “84”,”85”) IGPH multi purpose horizontal reference output signal; image-port (controlled by subaddr.
  • Page 22 The mono intercarrier sound circuit has a selective FM-PLL demodulator which can be switched to the different FM sound frequencies (4.5/5.5/6.0/6.5 MHz). The quality of this system is such that the external band-pass filters can be omitted. In the stereo versions of UOCIII the use of this demodulator is optional for special applications.
  • Page 23 EHTO EHT / overvoltage protection input AVL/SWO/SSIF/REFO/REFIN Automatic Volume Levelling / switch output reference output / external reference signal DVB operation AUDIOIN5L audio-5 input (left signal) audio-5 input (right signal) AUDIOIN5R AUDOUTSL audio output for SCART/CINCH (left signal) audio output for SCART/CINCH (right signal) AUDOUTSR DECSDEM decoupling sound demodulator...

  • Page 24: Chapter Three Signal Flow Analysis And Key Point Measure Data

    R/PRIN3 3rd R input / PR input G/YIN3 G input / Y input B/PBIN3 3rd B input / PB input BCLIN beam current limiter input Red output Green output Blue output INT0/P0.5 external interrupt 0 or port 0.5 (4 mA current sinking direct drive of LEDs) 98,99,102~109 P0.0~ P0.4...
  • Page 25 the AV/S and IF signal which is demodulated by main demodulator are sent by TV plank into video decode chassis UOC for decoding ,then the output analog video signal is sent into analog -to-digital Ⅲ converter TDA8759HV/8/C1 for A/D transform to produce R、G、B digital signals which are transformed in format by GM1601/GM1501, then, it transformed the different input formats into the uniform up-screen signal format.
  • Page 26 The composition and distribution of the TV power supply： （please see the next page）...

  • Page 27: Manostat Pin Voltage In Main Board Schedule

    The Manostat Pin Voltage in Main Board Schedule Name Type PIN1(V) PIN2(V) PIN3(V) PIN4(V) PIN5(V) LM1117-1.8V LM1117-3.3V LM2596-5.0 U405 LM1117-3.3 78M08 U403 LM1117-1.8V U503 LM1806-3.3 U505 LM1117-2.5 U506 LM1117-3.3 U501 LM2596-5.0 U502 LM2596-5.0 U504 LM1117-1.8V Main Components and Socket Locations and Definitions:...
  • Page 28 Outlet Definition: Number Name Connected Object Function Description TV plane Side AV DVD AV output Speaker loudhailer DVD decode board outside AV input screen(screen inverter input） JP10 screen(screen inverter input) JP12 power supply plane GND，GND，GND，+12V，+12V，+12V...

  • Page 29: Main Components Description

    J171 Prepare to use JP11 power supply plane +12V，+12V，GND，GND，GND，GND，24V，24V power supply plane SB，GND，GND，5V，5V，5V，GND，GND，12V， J700 Prepare to use CN702 Prepare to use CN700 remote control CN701 K plane CN304 Prepare to use CN303 Prepare to use JP701 display CN306 Prepare to use AVP303 DVI audio input CN300...
  • Page 30 2 RF input color stripe signal,the Pin85,Pin86,Pin87 of U201 output R,G,B signal wave,the E pole wave of Q171,Q172,Q173: 3 RF input color stripe signal, I²C bus clock signal UOCIII_SCL, the wave of the 98 pin of U201,the 11 pin of U5,the 4 pin of parent/sub RF tuner:...
  • Page 31 .4 RF input color stripe signal, UOC vertical sync signal, the wave of the 22th pin of U201,the 105 pin of U400: .5 RF input color stripe signal，UOC vertical sync signal , the wave of the 22th pin of U201,the 105 pin of U400: RF input color stripe signal，UOC vertical sync signal , the wave of the 22th pin of U201,the pin of U400:...
  • Page 32 .6 RF input gray ladder signal, the TV signal wave in the 19 pin of SAA7115: The wave in the 10 of SAA7115 also like this:...
  • Page 33 7 The 1KHz sound signal input, the wave of the 60 、61th pin of U201, the wave of the 2th、6 pin of U6 also like this: The 1KHz sound signal input, the wave of 16 、17 、20 、2140 、41th 、44 、...
  • Page 34 Location Type PIN1(V) PIN2(V) PIN3(V) PIN4(V) PIN5(V) LM1117-1.8V LM1117-3.3V LM2596-5.0 U405 LM1117-3.3 78M08 U403 LM1117-1.8V U503 LM1806-3.3 U505 LM1117-2.5 U506 LM1117-3.3 U501 LM2596-5.0 U502 LM2596-5.0 U504 LM1117-1.8V...

  • Page 35: Chapter Four Symptoms And Correction

    CHAPTER FOUR SYMPTOMS AND CORRECTION Symptom One：Display card of PC no image in DVI. Reason and Resolve: If some display card of DVI can not receive the data when turning on the TV, there is no output; if pull out the DVI line abruptly, there is also no DVI output; Before starting PC, connect the DVI line with LCD TV steadily, So DVI can receive the correct date from DDC（...

  • Page 36: Chapter Five Lists Of Breakable And Maintenance Parts

    CHAPTER FIVE BREAKABLE AND MAINTENANCE PARTS This list is provided for reference, all the parameters of those maintenance parts are subject to change without notice for future improvement, please refer the latest models and specifications as the standard. CHD-260F8 Breakable Assembly Assembly Name...
  • Page 37 Base decoration board 8735600040J JUJ7.356.004 Base 8807000160J JUJ8.070.016 Main board assembly （LG screen） 8669000350J JUJ6.690.035 PCB JUJ7.820.088 Main board assembly （SAMSUNG screen） 8669000354J JUJ6.690.035-4 PCB JUJ7.820.088 AV board assembly 8669300150J JUJ6.693.015 PCB JUJ7.820.103 TV board assembly 8669700040J JUJ6.697.004 PCB JUJ7.820.128 Remote receive board...

  • Page 38: Chapter Six Factory Setup And Notice

    Sound boxes 56232971081 Y3297-L-10W-8Ω Sound boxes 56232971082 Y3297-R-10W-8Ω Electric speaker 56232971082 Y3297-R-10W-8Ω Electric speaker 56239390580 Y3939-01-5W-8Ω Remote controller 8201803510L KLC5A DVD maintenance parts( only for models with DVD module): DVD touch key label 8661800060J JUJ6.618.006 output board assembly 8669300120J JUJ6.693.012 decoding board assembly...
  • Page 39 Contrast adjusting it Balance Sound balance The tuning value is 50，-50， V+/V- Volume Sound Volume V+/V- Step is 10 Sound System Sound System V+/V- DK/I/BG/M Auto Search Auto searching V+/ok Source of Signal is TV White Balance White balance V+/ok AutoColor Auto color revise Source...
  • Page 40 4. BBE plus adjustment Index number of BBE plus adjustment is 22 and 23,adjust it by adjusting “V+/V-”,the value of W270F8E and W320F8E are set 0X09,but the W370F8E is set 0X0F. 5. Press down the 【DISPLAY】 first before switching the program number in factory mode, press P+/P- to switch before the display content do not disappear;...
  • Page 41 K12000 0.270 0.277 Note：The color temperature and color coordinate are contented for above request, you should judge the exist of color windage phenomenon, namely the value of Δuv is 0 or not If Δuv is not 0 , readjust R,G,B value to 0,and meet color coordinate request.

  • Page 42: Appendix (Schematic Diagram)

    Ls08-Frame Memory-02 Ls08-Frame Memory-02 Ls08-AD convert-01 FSDQM[0..3] Ls08-AD convert-01 LS08-Gm1601-03 ls08-Graphics_Components In-04 FSDATA[0..31] FSDQM[0..3] FSCKE MSTR_SDA MSTR_SCL LS08-Gm1601-03 ls08-Graphics_Components In-04 FSDQS FSCKE MSTR_SDA MSTR_SCL FSBKSEL1 VGRN[7..0] /OCM_WE GREEN+ BLUE- 23SDD[31..0] FSBKSEL1 VGRN[7..0] /OCM_WE GREEN+ BLUE- RGB/YPbPr_SEL /FSCAS 23SDD[31..0] /FSRAS RXC- VGA_SDA /FSCAS 23SDD[31..0]...
  • Page 43 +5VOUT VCC5A 0.1uF RA35 4.7k RA18 CA20 SC1_GIN SC1_GIN VCC5A 10uF 2SC1815Y Video1Y_IN RA36 4.7k RA45 CA1 0.1uF Video1C_IN RA19 +5VOUT VCC5A VCC5A To UOCIII&Tuner Board. CON-9 RA37 RA16 RA17 4.7k To GM1601 Board. CA21 SC1_BIN 2SC1815Y SC1_BIN Scart1_G Scart1_G +5VOUT 10uF RA20...
  • Page 44 U201B C204 To TDA9178 SC1_RIN 0.1uF SC1_RIN R3/Pr RT11 YY_out YOUT SC1_GIN C203 RT12 U_out V1_8V1_A V1_8V1 SCART1 RGB INPUT SC1_GIN G3/Y UOUT/INSSW2 L201 U201A 0.1uF C211 RT13 V_out VCC5A 10uH VOUT/SWO1 10uH SC1_BIN 0.1uF VDD5A_1 SC1_BIN B3/Pb VDD5A_1 VDDC 3D_IN R265 CVBSO/PIP...
  • Page 45 DVI CONNECTOR CN300 TP308 TP316 TP300 RX2- RX2- RX2- R X 2 + RX2+ RX2+ TP309 TP317 RX4- TP305 RX4+ DVISCL DVISDA TP310 TP318 TP301 RX1- RX1- RX1- R X 1 + RX1+ RX1+ Static Protection. TP311 TP319 RX3- TP306 RX3+ DVI Test Points are just SMTobservation points on the traces with no stub R300...
  • Page 46 RN700 RN701 22X4 FSDATAU0 F S D A T A 0 22X4 FSDATAU1 F S D A T A 1 FSCKEU FSCKE FSCKE FSDATAU2 F S D A T A 2 /FSRASU /FSRAS /FSRAS FSDATAU3 F S D A T A 3 /FSCASU /FSCAS FSDQM[0..3]...
  • Page 47 RN401 22X4 R406A ADUB00 V B L U 0 ADUB11 V B L U 1 U400A ADUB22 TDA8759 V B L U 2 C420 ADUB33 V B L U 3 R406 ADUB44 V B L U 4 REF_B/Pb Q172 c4119 22X4 ADUB55 V B L U 5...
  • Page 48 R519 R521A NC R521 32V-EN C501A 0.1uF +5V_MCU U501 LM2596-5.0 DP3A L500 TP504 R505 BAS62-A13 +12V_3A U502 Feedback 1.2/0.5W BAS62-A13 Panel_Power LM2596-5.0 33uH D502 output L501 SMB05 +24V_1A Feedback C500 C502 R502 33uH 470uF 0.1uF output C502A C503 C501 C505 100uF/35V C519 0.1uF...
  • Page 49 +12V_3A +12V_DC 33uH 100uF/16V 0.1u CA42 CA24 0.47uF 0.1uF 2SA1015Y 2CK75D CA25 +12Vaudio_ctrl 0.1uF 33uH CON2 CA38 RA15 470K 10K RA3 +12V_AUDIO 150K CA53 +12V_AUDIO 47uF/16V CA33 CA39 CA55 0.1u When mode_in is Low,AMP is in class_D. RA50 0.1u +24V_4A 100K CA37 W05Z6.8B...
  • Page 50 +2.5V_DDR C602 C603 C604 C605 C606 C607 C608 C609 C610 C611 C612 C613 C614 C615 C600 47uF/6.3V 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF L600 5.6uH/5% FSDATA[0..31] FSDATA[0..31] +3.3V_SW FSVREF +2.5V_DDR FSVREF C616 C617 47uF/6.3V 0.1uF...
  • Page 51 Component Video Inputs JPY1 +12V_PORT RA10 RA51 CA31 改 为 0.1uF RA49 AVP1 YPbPr AV-3-1 RA11 2SC2712C AV_IN 100P AV-1-3PKA VOUT AV_VOUT 2SC1162Y AV_VOUT RA12 RA48 16V470uF 100P VOUT AVP2 JPY3 AV-3-1 YPbPr Left Audio AV-OU YPbPr_L LOUT AV-1 ROUT +12V_dc +12V_PORT JPY2...
  • Page 52 1.61~2.3v:MENU 0.81~1.6v:VOL-- 0~0.8v: STANDBY++ 2.3~3.0:source 2.0V 1.2V 0.3V 2.67V 4.7K SOURCE MENU VOL--- POWER 4.7K VOL++ CN-4 CH-- NO KEY PRESS 3V~3.3v 2.0V 1.2V 0.3V 1.61~2.6v:VOL+ 0.81~1.6v:CH-- 0~0.8v: CH++ Title Size Number Revision Date: 13-Apr-2005 Sheet of File: E:\USER\MJ\LP08\YLT-chn\LS08 辅板 -CHINA-0923.ddb Drawn By:...
  • Page 53 +3.3V_DIG 22UH IRDATA LED2 LED1 +3.3V_DIG 0.1UF CN-5 16V-47U GREEN HS0038A2M3V LIGHT Title Size Number Revision Date: 13-Apr-2005 Sheet of File: E:\USER\MJ\LP08\YLT-chn\LS08 辅板 -CHINA-0923.ddb Drawn By:...
  • Page 54 3.3uH +5VOUT 330pF 330pF EARPHONE-R 3.3uH 2SC2712C 16V-10U 330pF 330pF W3F4P-D PH-SW 2SC2712C CN-4 +5VOUT 2SC2712C 2SC2712C AUDIO-L-IN 16V-10U AUDIO-R-IN 2SC2712C 3.3uH 330pF 330pF CON-9 AUDIO-L-IN +5VOUT 100pF AVW133RD-1S + C12 16V100U 0.1uF AUDIO-R-IN 100pF Title Size Number Revision Date: 13-Apr-2005 Sheet of File:...
  • Page 55 CON-10 +12V_3A For GM1601 Board supply. +5V_4A +5V_4A For panel supply. +5V_4A +5V_MCU +5VB 22uH VCC5A CP13 CP15 470uF 0.1uF 0.1uF 470uF 0.1uF 0.1uF 32V-EN StandBy_power +24V_4A +24V_4A 470uF LM2596-5.0 33uH JP10 +24V_1A Feedback +24V_1A JP11 output CP34 CP37 0.1uF 0.1uF CP35 1N5824...
  • Page 56 OCMDATA[0..7] OCMDATA[0..7] +3.3V_DIG U801 29LV800BT OCMADDR[0..19] OCMADDR[0..19] +3.3V_DIG OCMADDR19 BYTE# OCMADDR18 OCMADDR17 OCMADDR0 A-DQ15 C800 C801 OCMADDR16 DQ14 47uF/6.3V 0.1uF OCMADDR15 DQ13 OCMADDR14 DQ12 OCMADDR13 DQ11 OCMADDR12 DQ10 OCMADDR11 OCMADDR10 OCMADDR9 OCMDATA7 OCMADDR8 OCMDATA6 OCMADDR7 OCMDATA5 OCMADDR6 OCMDATA4 OCMADDR5 OCMDATA3 /OCM_WE OCMADDR4 OCMDATA2...
  • Page 57 NTC1 R119 VAR1 +24V VCC2 +12V LINE Vboot DISABLE PC4B STBY ISEN VCC1 COMP C28 C29 R117 VCC1 PC1B VCC2 ICS1A +24V +12V R118 R121 R122 +5VSB ICS1B +5VSB +12V PS-ON ICS1C PC1A VCC1 +24V PC4A PC3A R108 R113 PC5B R105 R101 R103...

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