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Akai LTA-26C902 Service Manual
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Akai LTA-26C902 Service Manual

Akai LTA-26C902 Service Manual

Colour tv set
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LTA-26C902
LTA-32C902
LTA-37C902
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Summary of Contents for Akai LTA-26C902

  • Page 1 All manuals and user guides at all-guides.com Models: LTA-26C902 LTA-32C902 LTA-37C902 www.akai.ru...
  • Page 2 All manuals and user guides at all-guides.com...
  • Page 3 All manuals and user guides at all-guides.com...
  • Page 4 All manuals and user guides at all-guides.com 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) ●...
  • Page 5 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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.

  • Page 7: General Introduction

    All manuals and user guides at all-guides.com 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...

  • Page 8: Pin Description

    All manuals and user guides at all-guides.com 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...
  • Page 9 All manuals and user guides at all-guides.com 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...
  • Page 10 All manuals and user guides at all-guides.com 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...
  • Page 11 All manuals and user guides at all-guides.com 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...
  • Page 12 All manuals and user guides at all-guides.com 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。...
  • Page 13 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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,...
  • Page 15 All manuals and user guides at all-guides.com 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：...
  • Page 16 All manuals and user guides at all-guides.com (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 All manuals and user guides at all-guides.com 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: ●...
  • Page 18 All manuals and user guides at all-guides.com 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.

  • Page 19: Pin Function

    All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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...
  • Page 21 All manuals and user guides at all-guides.com 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.
  • Page 22 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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) AUDOUTSR audio output for SCART/CINCH (right signal) DECSDEM...
  • Page 24 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com the AV/S and IF signal which is demodulated by main demodulator are sent by TV plank into video decode chassis UOC Ⅲ for decoding ,then the output analog video signal is sent into analog -to-digital 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...
  • Page 26 All manuals and user guides at all-guides.com The composition and distribution of the TV power supply： （please see the next page）...
  • Page 27 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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) GND，GND，GND，+12V，+12V，+12V JP12 power supply plane...
  • Page 29 All manuals and user guides at all-guides.com 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...
  • Page 30 All manuals and user guides at all-guides.com 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...
  • Page 31 All manuals and user guides at all-guides.com .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...
  • Page 32 All manuals and user guides at all-guides.com .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 All manuals and user guides at all-guides.com 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...
  • Page 34 All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com 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 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. Akai LTA-26C902 Breakable Assembly...
  • Page 37 All manuals and user guides at all-guides.com 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...
  • Page 38 All manuals and user guides at all-guides.com 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...
  • Page 39 All manuals and user guides at all-guides.com Contrast adjusting it The tuning value is 50，-50， Balance Sound balance 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...
  • Page 40 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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...
  • Page 43 All manuals and user guides at all-guides.com +5VOUT VCC5A 0.1uF RA35 4.7k RA18 CA20 SC1_GIN SC1_GIN VCC5A 10uF 2SC1815Y Video1Y_IN RA36 CA1 0.1uF 4.7k RA45 Video1C_IN RA19 +5VOUT VCC5A VCC5A To UOCIII&Tuner Board. RA37 CON-9 RA16 RA17 4.7k To GM1601 Board. CA21 SC1_BIN 2SC1815Y...
  • Page 44 All manuals and user guides at all-guides.com 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...
  • Page 45 All manuals and user guides at all-guides.com DVI CONNECTOR CN300 TP308 TP316 TP300 RX2- RX2- RX2- RX2+ R X 2 + RX2+ TP309 TP317 RX4- TP305 RX4+ DVISCL DVISDA TP310 TP318 TP301 RX1- RX1- RX1- R X 1 + RX1+ RX1+ Static Protection.
  • Page 46 All manuals and user guides at all-guides.com 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...
  • Page 47 All manuals and user guides at all-guides.com RN401 22X4 ADUB00 V B L U 0 R406A ADUB11 V B L U 1 U400A ADUB22 TDA8759 V B L U 2 C420 ADUB33 V B L U 3 R406 ADUB44 REF_B/Pb V B L U 4 Q172 c4119...
  • Page 48 All manuals and user guides at all-guides.com 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...
  • Page 49 All manuals and user guides at all-guides.com +12V_3A +12V_DC 33uH 100uF/16V 0.1u CA42 CA24 0.47uF 0.1uF 2SA1015Y 2CK75D CA25 +12Vaudio_ctrl 33uH 0.1uF 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 +24V_4A 0.1u...
  • Page 50 All manuals and user guides at all-guides.com +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...
  • Page 51 All manuals and user guides at all-guides.com Component Video Inputs JPY1 +12V_PORT RA10 RA51 CA31 改 为 0.1uF RA49 AVP1 YPbPr RA11 AV-3-1 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...
  • Page 52 All manuals and user guides at all-guides.com 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...
  • Page 53 All manuals and user guides at all-guides.com +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 All manuals and user guides at all-guides.com 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...
  • Page 55 All manuals and user guides at all-guides.com 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...
  • Page 56 All manuals and user guides at all-guides.com 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...

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