Changhong Electric LS08 Service Manual
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Changhong Electric LS08 Service Manual

Changhong Electric LS08 Service Manual

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LCD TELEVISION
SERVICE MANUAL
LS08
Chassis
Please read this manual carefully before service.
1

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Summary of Contents for Changhong Electric LS08

  • Page 1 LCD TELEVISION SERVICE MANUAL LS08 Chassis Please read this manual carefully before service.

  • Page 2: Table Of Contents

    Contents PartⅠ: Specifications and Composition……………………………………………………….3 Specification……………………………………………………………………………...3 Main feature……………………………………………………………………………..3 Unit circuit composition…………………………………………………………………4 PCB assembly introduction……………………………………………………………..4 PartⅡ: Function Introduction of Main IC ……………………...…………………………….6 Main components and function…………………………………………………………6 Main components function introduction……………………………………………….6 2.2.1 Main tuner TAD5-U2I23RW……………………………………………………..6 2.2.2 Sub tuner TMI4-U22P2RW………………………………………………………..6 2.2.3 GM1501……………………………………………………………………………..7 2.2.4 TDA8759…………………………………………………………………………...11 2.2.5 TPA3002D2………………………………………………………………………..14...

  • Page 3: Partⅰ: Specifications And Composition

    PartⅠ: Specifications and Composition 1.Models for LS08 Chassis, F series ： 26 inch TV, 27 inch TV, 32 inch TV, 37 inch TV 2.Main feature: ● Radio Frequency input; support CATV Capable to receive the full CATV programs. ● AV input Capable to receive PAL, NTSC, SECAM color systems;...

  • Page 4: Unit Circuit Composition

    Favorite channel, favorite channels can be selected conveniently. 3. Unit circuit Composition： LS08 chassis LCD TV is mainly composed of regulator circuit、 RF circuit、 video processor circuit、 Power Amplify circuit、Analog Video circuit、System Control circuit and Key Control circuit, block diagram of unit circuit is below: 4.
  • Page 5 It consists of 7 function buttons by which users can operate the TV freely. assembly Screen Screen for LS08 has built-in inverter which change DC to high voltage AC signal to assembly lighten the back light lamp; The LCD panel use it to display the image after the image signal has been processed by the main board.

  • Page 6: Main Components Function Introduction

    PartⅡ: Brief Introduction to Main IC Function 1.Main ICs and Functions： TV Board Number Location Type Main Function UT400 TMI4-U22P2RW Subchannel CVBS signal output, sub-tuner Audio and image IF signal output, main tuner UT401 TAD5-U2I23RW Main Board 24LC21A T/SN EEPROM U302，U303 U701 24LC32A T/SN...

  • Page 7: Gm1501

    Power supply To produce 0~30V tune voltage IF output (NC) IF output (NC) Band control Band control Auto gain control VEDIO CVBS signal output Power supply AUDIO (3)GM1501 GM1501 is a kind of dual channels image and video processing chip, which is mainly used for LCD displays and TV integrated products.
  • Page 8 Green analog signal input C1、C2 GREEN+、- B1、B2 BLUE+、BLUE- Blue analog signal input A2,B3,E3,D3 ADC3.3 ADC3.3Vpower supply A3，A4 ADC1.8 ADC1.8Vpower supply A5，B4 ADC-DGND ADC digital ground ADC-AGND ADC analog ground C4，D4，E1，E2，E4 DVI import port DDC interface , serial clock signal DVI-SCL DDC interface ，serial data signal DVI-SDA A6，B6...
  • Page 9 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 VCLK Video pixels clock signal VHS_CSYNC Video horizonl synchronization signal input Video vertical synchronization signal input VODD Scan status input VDV (VSOG) Video data input VCLAMP...
  • Page 10 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 terminal System Signal RESETn Reset signal M3，M4 IR0，IR1 MSTR_SCL Master clock output signal MSTR_SDA Master data output/input signal EXTCLK External clock input Frame buffer interface...

  • Page 11: Tda8759

    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， NO_CONNECT K3，F1 GM1501internal block Diagram： (4) Brief Introduction of TDA8759： TDA8759 is a triple 8-bit video converter interface. Sample rate is up to 81 Mbps .The IC can convert analog RGB signal into a 24bit RGB digital signal o, or converts analog YUV or YCbCr signal into a YUV or RGB digital.
  • Page 12 ●Output format support RGB 4:4:4, YUV 4:4:4, YUV 4:2:2 ,CCIR 656 or YUV 4:2:2 ； ●I²C bus control ●Programmable clock phase correct circuit inside ●100 MHz Amplifier bandwidth ●Integrated PLL distribution ●Power-Down mode TDA8759 internal schematic Diagram： Pin Description： Name Description HREF Horizon reference output...
  • Page 13 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 signal 52,51,50 B/Pb1~ B/Pb3 Blue/blue-chrominance channel analog input BIAS Bias input REFG/Y Green/luminance reference input 65,64,63 G/Y1~G/Y3 Green/luminance analog input 74,73,72 SOG/Y1~SOG/Y3 Sync on green//luminance input REFR/Pr Red/red-chrominance channel reference input 80,79,78...

  • Page 14: Tpa3002D2

    (5)TPA3002D2 brief： The TPA3002D2 is a 9-W (per channel) high efficiency, Class-D audio amplifier for driving bridged-tied stereo speakers. The high efficiency of the TPA3002D2 eliminates the need for external heatsinks and power supply equipment when playing music. Main Features： ●...
  • Page 15 38,39,46,47 PVCCR AVCC. PVCCL 22, 23 – Power supply for left channel H-bridge (tied to pins 14 and 15 internally), not connected to PVCCR or AVCC. PVCCR 38,39 – Power supply for right channel H-bridge (tied to pins 46 and 47 internally), not connected to PVCCL or AVCC.

  • Page 16: Sm5302As

    (6)Brief Introduction to SM5302AS ： th - The SM5302AS is a 3-channel video buffer with built-in 5 order low pass filter. The cutoff frequency, signal input type, and output gain switching can be controlled using a IIC control bus, and the IIC slave address can be set by ADS(3-state input) to allow a maximum of three devices to be used simultaneous.
  • Page 17 Pin Description： Name Description REF1 Internal reference voltage 1 Digital supply(3.0~5.5V). IIC data signal input/output IIC clock signal input Digital ground MUXSEL Input multiplexer switch control IIC slave address select(three state input) IN1A Video signal input 1(CH-1, input A) IN1B Video signal input 1(CH-1, input B) Ω...

  • Page 18: Saa7115

    GND2 Analog ground(CH-2) Out2B Video signal output(CH-2,for sag compensation) Out2A Video signal output(CH-2) VCC2 Analog supply(CH-2)(4.75 to 5.25V). GND1 Analog ground(CH-1, Vref) Out1B Video signal output(CH-1,for sag compensation) Out1A Video signal output(CH-1) VCC1 Analog supply(CH-1,Vref)(4.75 to 5.25V). REF3 Internal reference voltage 3 REF2 Internal reference voltage 2 (7)Brief Introduction to SAA7115：...
  • Page 19 Test Data Output for Boundary Scan Test Test Data Input for Boundary Scan Test (with internal pull-up) XTOUT crystal oscillator output signal, auxiliary signal XTALO 24.576 (32.11) MHz crystal oscillator output; not connected if XTALI is driven XTALI 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.
  • Page 20 (controlled by subaddr. “84”,”85”) IGPH multi purpose horizontal reference output signal; image-port (controlled by subaddr. “84”,”85”) 54~57,59~62 IPD0~IPD7 image port data output 64~67,69~72 HPD0~HPD7 Host port data I/O, carries UV chrominance information in 16 bit video I/O modes XTRI X-port output control signal, effects all X-port pins (XPD[7:0], XRH, XRV, XDQ and XCLK) enable and active polarity is under software control (bits XPE in subaddr.
  • Page 21 Name Description 1,2,12,18,28,40 VSS,GND ground 68,81,89,92,95,101 121,125 3,4,45,69,82,88,90, Power supply 91,93,94,96,100, 110,117,118,124 VREF_POS_LSL SDAC input signal VREF_NEG_LSL+HPL VREF_POS_LSR+HPR VREF_NEG_HPL+HPR VREF_POS_HPR XTALIN Crystal oscillator input XTALOUT Crystal oscillator output VGUARD/SWIO V-guard input / I/O switch DECDIG decoupling digital supply decoupling digital supply PH2LF phase-2 filter phase-1 filter...
  • Page 22 supply voltage TV processor (+5 V) IFVO/SVO/CVBSI video output / selected CVBS output / CVBS AUDIOIN4L audio-4 input (left signal) AUDIOIN4R audio-4 input (right signal) CVBS4/Y4 CVBS/Y input chroma-4 input AUDIOIN2L/SSIF AUDIOIN2R AUDIOIN3L AUDIOIN3R Audio input AUDOUTLSL AUDOUTLSR AUDOUTHPL AUDOUTHPR CVBS3/Y3 CVBS/Y input C2/C3...
  • Page 24 -53 - CIRCUIT 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]...
  • Page 25 -54 - +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...
  • Page 26 -55 - 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...
  • Page 27 -56 - 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 C502 C500 R502 33uH 0.1uF 470uF output C503 C502A C505 C501 100uF/35V...
  • Page 28 -57 - RN401 22X4 R406A ADUB00 VBLU0 ADUB11 VBLU1 U400A ADUB22 VBLU2 TDA8759 C420 ADUB33 VBLU3 R406 ADUB44 REF_B/Pb VBLU4 Q172 c4119 RN404A 22X4 ADUB55 VBLU5 R183 2SC1815Y ADUB7 ADUB77 ADUB66 B/Pb3 VP27 VBLU6 TV_Bout ADUB6 ADUB66 ADUB77 VBLU7 TV_Bout VP26 L174 PBout...
  • Page 29 -58 - RN700 22X4 RN701 FSDATAU0 FSDATA0 22X4 FSDATAU1 FSDATA1 FSCKEU FSCKE FSCKE FSDATAU2 FSDATA2 /FSRASU /FSRAS /FSRAS FSDQM[0..3] FSDATAU3 FSDATA3 /FSCASU /FSCAS /FSCAS FSDQM[0..3] C701 C700 C702 C703 +1.8V_CORE FSDATAU4 FSDATA4 FSDQMU1 FSDQM1 47uF/6.3V 47uF/6.3V 0.1uF 0.1uF FSDATAU5 FSDATA5 /FSWEU /FSWE /FSWE...
  • Page 30 -59 - DVI CONNECTOR CN300 TP308 TP316 TP300 RX2- RX2- RX2- RX2+ RX2+ RX2+ TP309 TP317 RX4- TP305 RX4+ DVISCL DVISDA TP310 TP318 TP301 RX1- RX1- RX1- RX1+ RX1+ RX1+ Static Protection. TP311 TP319 RX3- TP306 RX3+ R300 DVI Test Points are just SMTobservation points on the traces with no stub 10K/5% R304 TP312...
  • Page 31 -60 - U201B C204 To TDA9178 R_IN1 0.1uF R_IN R3/Pr RT11 YY_out YOUT G_IN1 C203 RT12 U_out V1_8V1_A V1_8V1 SCART1 RGB INPUT G_IN G3/Y UOUT/INSSW2 L201 U201A 0.1uF C211 RT13 V_out VCC5A 10uH VOUT/SWO1 10uH B_IN1 0.1uF B_IN B3/Pb VDD5A_1 VDD5A_1 VDDC 3D_IN...
  • Page 32 -61 - +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 RA37 CON-9 RA16 RA17 4.7k CA21 SC1_BIN 2SC1815Y SC1_BIN Scart1_G Scart1_G +5VOUT 10uF RA20 RA21 RA38 Scart1_B Scart1_B...
  • Page 33 -62 - +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 CA53 150K +12V_AUDIO 47uF/16V CA33 CA39 CA55 0.1u When mode_in is Low,AMP is in class_D. RA50 +24V_4A 0.1u 100K...
  • Page 34 -63 - 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...
  • Page 35 -64 - CN303 +5V_ANG R308 Tel_SCL UOCIII_SCL R309 Tel_SDA UOCIII_SDA +5V_MUX Teltext_R CON8 VCC5A RA29 4.7k CN304 FSAV330M Teltext_G SCART_TXT_SEL 10uF/16V Teltext_B FB_TXT Scart1_R +12V_DC uoc_hs Teltext_R FBLIN1 uoc_vs R_IN1 FB_TXT RA22 CA11 TXT_Video 0.1uF RA24 Scart1_G FB_IN1 CON8 2SC2712C Teltext_G Scart1_B CA12...
  • Page 36 -65 - RA408 Component Video Inputs CA406 100pF CA407 100pF JPY400 Y_YPBPR CA404 CA405 RY401 100pF 100pF RA407 JPA400 SC1_OR RA431 RA422 SC1_Raudio SC1_OR SC1_Raudio SC1_OL RA432 SC1_OL RA423 SC1_Laudio SC1_Laudio SC1_BIN RA428 AVS1 SC1_BIN AVS1 YPbPr R_YPBPR RA402 SC1_GIN RA429 SC1_GIN RA426...

  • Page 37: Partⅲ: Analysis Of Signal Process Flowchart And Key Point Measure Data

    PartⅢ: Analysis of Signal Process Flowchart and Key Point Measure Data The chapter mainly introduces the receipt and process of the video and sound signal, the power supply system and system control process . Ⅰ 、Video signal process flow： The AV/S and IF signal which is demodulated by main tuner on TV board assembly are sent into video decode chip Ⅲ...
  • Page 38 2、The Pin Voltage of regulator on 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...
  • Page 39 U506 LM1117-3.3 U501 LM2596-5.0 U502 LM2596-5.0 U504 LM1117-1.8V Ⅳ、Main Components and Socket Locations and Definitions on main board module: socket Definition: Number Name Connected Object Function Description JP400 TV board JP401 side AV DVD AV output speaker speaker DVD decode board outside AV input...
  • Page 40 inverter input of LCD panel JP10 inverter input of LCD panel JP12 power supply board GND，GND，GND，+12V，+12V，+12V J171 Prepare to use JP11 power supply board +12V，+12V，GND，GND，GND，GND，24V，24V power supply board SB，GND，GND，5V，5V，5V，GND，GND，12V， J700 Prepare to use CN702 Prepare to use CN700 remote control board CN701 K board CN304...

  • Page 41: Key Point Waveform Diagram

    U302 24LC21A T/SN EEPROM U303 24LC21A T/SN EEPROM Ⅴ、Key point waveform diagram: 1、RF input full color stripe signal, waveform of the 18 pin of sub tuner UT400, the 3 pin of JP400 and the 10 pin of SAA7115 is like this: 2.RF input full color stripe signal, the waveform of Pin85,Pin86,Pin87 of U201 output R,G,B signal ,the E pin of Q171,Q172,Q173 is like this: 3、RF input full color stripe signal, the waveform of I²C bus clock signal UOCIII_SCL, the 98...
  • Page 42 4、RF input full color stripe signal, the waveform of I²C bus clock signal UOCIII_SDA, the 99 pin of U201,the 14 pin of U5,the 5 pin of main tuner UT401, the 5 pin of sub tuner UT400,the 5 pin of JP401 is like this: 5、RF input full color stripe signal, the waveform of UOC vertical sync signal, the 22 pin of U201,the pin of U400 is like this:...
  • Page 43 6、RF input gray ladder signal, the waveform of the 18 pin of sub tuner UT400,the 3 pin of JP400，the pin of SAA7115 is like this: 、61 7、The 1KHz sound signal input, the waveform of the 60 pin of U201, the 2th、6 pin of U6 is like this:...
  • Page 44 、17 、20 、21 、40 、41th 、44 、45 8、The 1KHz sound signal input, the waveform of 16 of U6 is like this:...

  • Page 45: Partⅳ: Maintenance Procedure And Examples Of Typical Troubleshooting

    PartⅣ: Maintenance Procedure and Examples of Typical Troubleshooting 1、Troubleshooting phenomenon：The display card of PC has no image display under DVI input. Reason and resolve: if some DVI display card can not receive the data when turning on the TV, there is no output;...
  • Page 46 PartⅤ: Spare Part Lists This list is only for reference, if change the parameters of those spare list ,we do not notice in advance. The exact type or specification is confirmed by newest information provided by corporation. 26 inch TV Breakable name code...
  • Page 47 Inside power supply 67128017905 FSP179-4F01 module 68219602735 V270W1-L04 tuner 8289100152E TMI4-U22P2RW 8289100562B TAD5-U2F23RW tuner 562D6608082 Y50138-01-8W-8Ω Speaker Box 56224605080 Y2929-01-5W-8Ω speaker 8201804110L Remote control box KLC5D 32 inch TV Breakable name code number PCB number proportion （‰） Front Frame 8807400410J JUJ8.074.041 Front board 8808100220J...
  • Page 48 Tv board module 8669700080J JUJ6.697.008 PCB JUJ7.820.193 Remote receive board module 8669400200J JUJ6.694.020 PCB JUJ7.820.143 8669400240J JUJ6.694.024 PCB JUJ7.820.162 Key board module 8833700110J JUJ8.337.011 Inside power supply 67128024105 FSP241-4F01 module 68213700105 LC370W01 Anti-static optical screen 8864000151J JUJ8.640.015-1 tuner 8289100152E TMI4-U22P2RW 8289100562B TAD5-U2F23RW tuner Speaker Box...
  • Page 49 Factory mode and notice PartⅥ: 1.Enter factory menu （1）Enter child lock of main menu in TV mode, press “OK”, the password input box will appear; （2）Use remote control to input the follows in order:7,red key,9,blue key, then you can enter factory mode menu. After entering factory mode menu, sign of the factory menu M will appear. 2.Factory menu and setup Factory menu display is below: Index: 1...
  • Page 50 design mode DPF preset V+/V- 1 represent preset BBE_CONT BBE gain set V+/V- adjust BBE gain BBE_PROC BBE gain set V+/V- adjust BBE gain Newcom Newcom set V+/V- 1 represent preset HWUC-PTC V+/V- 0 is set for VCR 0╳00 26-30 Not used Sound mode Off/BG/I/DK/M...
  • Page 51 （1）Auto color correct（AutoColor） You should finish auto color correct first before factory debug. Calibrate in TV、YPBPR and PC condition respectively. ① Required instrument one suit HD signal source one suit ②Debug（adjust in TV、YPBPR and PC condition respectively） Set the channel in C-3 under TV mode, then do AutoColor. Input full color stripe signal in YPBPR and do AutoColor.
  • Page 52 Annex 2: Final Assembly Diagram 32 inch TV...
  • Page 54 37 inch TV...
  • Page 56 Annex 3: Final Wiring Connection Diagram 32 inch TV...
  • Page 57 37 inch TV...

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