FILE NO. SM-CTV-O-046 COLOR TELEVISION SERVICE MANUAL MODEL NO.: AT3208S CHASSIS NO.: CH-10C3 Please read this manual carefully before service PRINTED IN CHINA.MAY.
CONTENTS SAFETY INSTRUCTIONS ....................................................................... 1 SPECIFICATIONS.................................................................................... 3 KEY ICS AND ASSEMBLIES................................................................... 4 SYSTEM BLOCK DIAGRAMS ................................................................. 5 IC DATA AND WAVEFORMS OF KEY POINTS ...................................... 8 CIRCUIT ADJUSTMENTS .............................
SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE PRECAUTION , SAFETY PRECAUTION AND X-RAY RADIATION PRODUCT SAFETY NOTICE INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. The nominal EHT for this TV is 28.8 0.8KV at zero beam current (minimum brightness) operating at AC 120V.
SERVICE MANUAL SAFETY INSTRUCTIONS(continued) PRODUCT SAFETY NOTICE Many electrical and mechanical components in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation protection afforded by them can not necessarily be obtained by using replacements rated at higher voltages or wattage, etc.
SERVICE MANUAL SPECIFICATIONS Model Number AT3208S Television system NTSC-M VHF 2 13/UHF 14 69/CABLE TV: MID BAND (A-8 A-1,A I) Channel coverage SUPER BAND (J W) HYPER BAND (AA ZZ, AAA, BBB) ULTRA BAND (65 Channels preset 94, 100 125) 181 Antenna input 75 Picture tube Effective screen dimensions(Approx.) (unbalanced) 480mm 640 25.2 Max. audio output 18.9in 5W+5W Power source 120Vac 60Hz Weight (Approx.) 57kg(126 lbs.) 854 Dimensions (W/H/D) (Approx.) 33.
SERVICE MANUAL KEY ICS AND ASSEMBLIES Table 1 Key ICs and Assemblies Serial No. Position No.
Fig.
SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (continued) Fig.
SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (continued) Fig.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS STR-F6626 Power Thick-film Circuit 1. Features STR-F6626 is one of Sanken STR-F66XX switch power thick-film hybrid Ics, which comprises a start circuit, oscillator, latch, driver, overcurrent protector, overvoltage protector and overheat protector. 2. System Block Diagram 3.Refer to Table 2 about Functions and Service Data of STR-F6626’s Each Pin.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) LC86F3248A (D701) 8-Bit Single Chip Microcontroller 1. Overview The LC863264/56/48/40A are 8-bit single chip microcontrollers with the following on-chip functional blocks: -CPU:Operable at a minimum bus cycle time of 0.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) LC86F3248A (continued) 2. System Block Diagram Fig.5 3.Refer to Table 3 about Functions and Service Data of LC86F3248’S Each Pin.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) AT24C08 EEPROM 1. Features Data EEPROM internally organized as 1024/2048 bytes and 64/128 pages×16 bytes Page protection mode, flexible page-by-page hardware write protection -Additional protection EEPROM of 64/128 bits, 1 bit per data page -Protection setting for each data page by writing its protection bit -Protection management without switching WP pin Low power CMOS Vcc=2.7 to 5.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) OM8839PS/TDA884X I2C-bus Controlled PAL/NTSC/SECAM TV Processors 1. Features 2. General Description The following features are available in all IC’s: The various versions of the TDA 884X/5X Multi-standard vision IF circuit with PLL series are I2C-bus controlled single chip TV demodulator processors which are intended to be applied in Alignment-free multi-standard FM sound PAL, NTSC, PAL/NTSC and multi-standard demodu-lator (4.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) OM8839PS/TDA884X (continued) Fig.7 Block Diagram OM8839PS (S-DIP 56 Envelope) 3. Block Diagram 4. Refer to Table 5 about Functions and Service Data of OM8839PS 13 s Each Pin.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA8350Q DC-coupled Vertical Deflection and High EMC immunity due to common mode inputs East-West Output Circuit Temperature (thermal) protection 1. Features East-West output stage with one single conversion Few extemal components Highly efficient fully DC-coupled vertical output bridge circuit Vertical flyback switch Guard circuit Protection against: -short-circuit of the output pins -short-circuit of the output pins to Vp resistor. 2.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA7057AQ 2 8W Stereo BTL Audio Output Amplifier with DC Volume Control 2. General Description The TDA7057AQ is a stereo BTL output amplifier with DC volume control. The device is designed for use in TVs and monitiors, but is also suitable for battery-fed portable recorders and radios. 1.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA6108JF Triple Video Output Amplifier 1. Features Typical bandwidth of 9.0 MHz for an output signal of 60 V (peak-to-peak value) High slew rate of 1850 V/ S No external components required Very simple application Single supply voltage of 200 V Internal reference voltage of 2.5 V Fixed gain of 51 Black-Current Stabilization (BCS) circuit Thermal protection. 2.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4053 Triple 2-channel Analog Multiplexer/Demultiplexer 1. Description selected (low impedance ON-state) by Sn. With E The HEF4053 is a triple 2-channel analog HIGH, all switches are in the high impedance multiplexer/demultiplexer with a common enable OFF-state, independent of SA to SC. input (E).
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4053 (continued) Pinning Pinning Diagram Y0A to Y0C Independent inputs/outputs Y1A to Y1C Independent inputs/outputs SA to Sc Select inputs E Enable input (active LOW) ZA to ZC Common inputs/outputs 3. Function Table Inputs Channel E Sn On L L Y0n-Zn L H Y1n-Zn H X none Notes H=HIGH state (the more positive voltage) L=LOW state (the less positive voltage) X=STATE is immaterial Fig.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) MSP34×0G Multistandard Sound Processor Family Other processed standards are the Japanese FM-FM multiplex standard (EIA-J) and the FM Stereo Radio standard. Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA-J. The MSP 34×0G has optimum stereo performance without any adjustments. All MSP 34×0G versions are pin and software downward-compatible to the MSP 34×0D.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA9808T Single Standard VIF-PLL with QSS-IF and FM-PLL Demodulator 1.Features ˙5V supply voltage (9V supply voltage for 2.General Description The TDA9808 is an integrated circuit for TDA9808(DIP20) only) single standard (negative modulated) vision ˙Applicable for IFs (lntermediate Frequencies) of 38.9MHz, 45.75MHz and 58.75 MHz with single reference QSS-IF in TV and VTR ˙Gain controlled wide band Video IF (VIF)- sets.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA9808T (continued) Fig. 14 Block Diagram 2. Block Diagram 3. Refer to Table 11 about Functions and Service Data of TDA9808T 21 s Each Pin.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TA1219AN Audio/Video Switching IC for TVs The TA1219AN is an audio/video switching IC for TV Sets. Conforming to I2C bus standards, it allows you to perform various switching operations through the bus lines by using a microcomputer. Furthermore, since the presence of a signal on its sync signal output pin can be determined by a microcomputer. it is possible to check each input/output channel (self-diagnosis).
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TA1219AN (continued) 2. Block Diagram Fig. 15 3.Refer to Table 12 about Functions and Service Data of TA1219AN 23 s Each Pin.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TC90A13N 3 Line Digital Y/C Separation IC The TC90A13N and TC90A13F separate luminance (Y) and Chrominance(c(signals from an NTSC composite video Signal. Lt employs the Toshiba original logical comb filter To Realize high performance Y/C separation at low cost 1. Features NTSC system PLL 4X multiplication circuit Sync.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) MM1031 Video Amplifier 1. Outline This IC is a 6dB amp for video signals (Y or composite signals). Gain is fixed at 6dB and it is used in 75e Signals). Gain is fixed at 6dB and it is used in 75Ω output circuits. 2. Features 1) For video signal (Y or composite) amplification 2) Built-in clamp circuit 3) 75 driver built in 4) Frequency response 7MHz 5) Current consumption 4mA typ. 6) Power supply voltage 5V 3. Block Diagram Fig. 17 4.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 2 Functions and Service Data of STR-F6626 (NQ821)’s Pins Pin No. 1 2 3 4 5 Function Description Digital Multimeter Positive Resistance Reference Voltage(V) (20K ) Overcurrent detection & voltage stabilization control input Switch transistor’s source Switch transistor’s drain Control circuit power Control circuit ground Negative Resistance (20K ) 1.87 0.687 0.6 0.09 144 17.85 0 0.0001 0. 0.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Clock line 1 Data line 1 Overload detecting input terminal Input terminal for selectable production modes Not connected Remote control input Not connected Comb filter direct-pass control Mute Not connected Not connected Not connected Standby control YUV switch control 4 3.5-3.7 5 7 7 3.6 4.54 4.54 3.34 5 9.4 5.18 0.01 5 0.01 0.01 0 0 0 0 0 0 9.2 9.3 9.4 7 9.3 9.4 9.4 9.3 7 5.9 5.46 5.43 5.4 5.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 Composite video signal input terminal Ground Audio signal output Decoupling capacitor connection Video input Black current control input Blue (B) signal output Green (G) signal output Red I signal output Beam current control Red I signal input Green (G) signal input Blue (B) signal input Selectable primary color s
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 6 Functions and Service Data of TDA8350Q-N6 (N401)’s Pins Pin No. Function Description 1 2 3 4 5 6 7 8 9 10 11 Vertical drive input (positive) Vertical drive input (negative) Feedback input Supply voltage Output 1 Not connected Ground Pump supply voltage input Output 2 Guard output Pincushion output 12 13 Pincushion input (negative) Pincushion input (positive) Digital Multimeter Positive Resistance Reference Voltage(V) (20K ) 2.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 6 7 8 9 Supply voltage B output R output G output 199.66 127.69 122.7 109 4.48 5.45 5.45 5.45 Table 9 Functions and Service Data of HEF4053 (ND01)’s Pins Pin No.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 I2S-DA-IN2 NC RESETQ DACA-R DACA-L VREF-I DACM-R DACM-L DACM-SVB SC2-OUT-R SC2-OUT-L CREF 1 SC1-OVT-R SC1-OUT-L SAPL-A AHVSUP CAPL-M AHVSS ABNDC SC3-ZN-L SC3-IN-R SC2-IN-L SC2-IN-R SC1-IN-L SC1-IN-R VREFTOP WONO-IN AVSS AVSVP ANA-IN1+ ANA-IN1ANA-IN2+ TESTEN XTAL-2N XTAL-OUT NC NC NC NC NC NC NC NC NC NC NC 0.07 0 4.76 0.8 0.08 0.01 0.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 7 Filter 1.79 8 1/2VCC comparison voltage bias 7.9 6.29 0 9 Video output 2.18 7.6 6.09 10 Second SIF signal output 2.03 7.7 6.17 11 Second SIF signal input 2.81 5.2 4.99 12 RFAGC output 0.04 13 3.05 7.9 6.2 15 AGC signal output External connection oscillating LC network External connection oscillating LC network 16 Ground 14 6.1 for VCO 2.76 7 6 for VCO 2.76 7 6 0 0.001 0.00 3.13 7.9 6.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 25 LinTV2 5 7.6 5.82 26 Yin 5 7.7 5.82 27 RinV2 5 7.6 5.82 28 Vin 5 7.8 5.6 29 Vcc 8 4.9 4.1 30 Cout 3.41 5.2 0.2 31 Rout1 3.89 0.2 5.46 32 Yout 3.42 7.4 0.2 33 Lout1 3.89 0.2 5.46 34 Vout1 4 7.4 0.2 35 RoutTV 3.89 0.2 5.48 36 LoutTV 3.89 7.4 5.48 Table 13 Functions and Service Data of TC90A13N (NK02)’s Pins Pin No.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 23 C OUT 3.83 1.2 1.39 24 BIAS2 1.7 6.8 5.92 25 Y OUT 3.54 1.2 1.39 26 VREF1 2.88 0.7 4.89 27 VDD4 4.83 0.7 0.91 28 VSS4 0.01 0.001 0.00 Table 14 Functions and Service Data of MM1031x5 (NK03)’s Pins Pin No. Function Description Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 1 Video signal amplification 2.08 7 5.6 2 Build-in clamp circuit 0.01 0.001 0.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 1.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) 2.
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Pin3,Pin5 Pin8, Pin10,Pin13 Measure with a GOS-622G oscilloscope.
SERVICE MANUAL CIRCUIT ADJUSTMENTS 1. General Description All adjustments are thoroughly checked and corrected before the TV outgoing. Therefore the TV should operate normally and deliver proper colour pictures upon installation. However, several minor adjustments may be required depending on the particular location where the TV is operated. This TV is shipped completely in carton. Carefully take out the TV from the carton and remove all packing materials.
SERVICE MANUAL CIRCUIT ADJUSTMENTS (continued) Before Adjusting After Adjusting SET-UP ADJUSTMENTS The following adjustments should be made when a complete realignment is required or a new CRT is installed. Perform the adjustments in order as follows. 1. Colour purity 2. Convergence 5. White Balance Note The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to Fig. 18. 1.
SERVICE MANUAL SET-UP ADJUSTMENTS (continued) 6-pole Magnet 4-pole Magnet Adjust the Angle (Vertical Lines) Adjustment of Magnets Purity Magnet Convergence Magnet Assembl Fixed Rotate Two Tabs At the Same Time (Horizontal Lines) Fig. 19 2. Convergence Adjustment Note: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. Center convergence adjustment 1) Receive the grille test pattern signals. 2) Set the brightness and contrast properly.
SERVICE MANUAL SET-UP ADJUSTMENTS (continued) 9) Stick three adhesive tapes on wedges as shown in Fig. 18. BLU Red Red/BLU GRN BLU Red/BLU Red GRN 4-pole Magnet Movement 6-pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke up (or down) Incline the Yoke Right(or Left) Circumference Convergence by DEF Yoke Fig. 20 SERVICE MODE AND BUS DATA 1. To Enter the Service Mode 1) Decrease the volume to 0 with the remote control.
SERVICE MANUAL SERVICE MODE AND BUS DATA (continued) Item MENU.00 V.POS /50H H.PHSH /50H V.SIZE /50H V.POS /60H V.PH /60H V.SIZE /60H V.SC V,LINE V.SIZE CMP MENU.01 SUB.BIGHT SUB.CONT V.KILL RF.AGC R.BIAS G.BIAS B.BIAS R.DRIVE G.DRIVE B.DRIVE MENU.02 H.AFC H.BLK.L H.BLK.R CROS.B/W VIDEO.LVL FM.LEVEL MENU.03 FM.MUTE AUDIO.MUTE VIDEO.MUTE SND.TRAP MENU.04 SUB.COLOR SUB.TINT S.SHARP CORING. C.EXT C.
SERVICE MANUAL SERVICE MODE AND BUS DATA (continued) C.KILL ON MENU.05 BLANK.DEF BLK.ST.DEF FBP.BLK.SW FILT.SYS VOL.FIL VIF.SYS.SW VIDEO.SW MENU.06 R/B ANGLE GREY MODE V.SETUP B.GAM.SEL RG.GAM.DEF MENU.07 BRT.ABL.TH EM.ABL.DEF BRT.ABL.DF MID.STP.DF MENU.08 DIGITAL.OSD OSD.CONT OSD.H.POS MENU.09 H.FREQ C.KILL.OFF AUDIO.SW T.DISBLE OPT.LOGO OPT.VID SW MENU.10 OPT.TV.AV OPT.AV1/2 OPT.AV3 OPT.COLOR OPT.V-CHIP OPT.CCD OPT.CLOCK OPT.P-ON SRCH.SPEED ROM.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS 1. Power On/Off 1.1 The power indicator lights but with no raster and sound. 1.2 The SMPS has no voltage output.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS(continued) 1.3 The SMPS outputs voltage higher than the rated value. 1.4 The power indicator lights, but the SMPS is still in the Standby mode. 2. Control System 2.1 The power indicator lights, but the CPU cannot enter the Operation mode after power-on again.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS(continued) 2.2 No characters display 2.3 Channel number remains unchanged during auto program. 3. Video Signal Processor 3.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS(continued) a. The color is abnormal. 4. Horizontal/Vertical Scan Circuit 4.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS(continued) 4.2 Line and field are not sync. 4.3 Raster is displayed as a horizontal bright line on the screen.
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS(continued) 4.4 The field amplitude of raster is not enough. 5. Audio System 5.
SERVICE MANUAL SERVICE SPARE PARTS LIST APPENDIX: 1. CIRCUIT DIAGRAM 2. FINAL WIRING DIAGRAM 3. FINAL ASSEMBLY DIAGRAM 4.
APPENDIX 1: CIRCUIT DIAGRAM OF AT3208S (1)
APPENDIX 1: CIRCUIT DIAGRAM OF AT3208S (2)
APPENDIX 2: MAIN PCB OF AT3208S
APPENDIX 2: PCB OF AT3208S CONTROL PCB AV PCB CRT RGB PCB
APPENDIX 2: POWER PCB OF AT3208S
APPENDIX 3: FINAL WIRING DIAGRAM OF AT3208 Cortrol Buttons PCB Assembly XSA03 XPK01 Cord Plug XP804 XSK01 XKW01 XSS01 XS801 From Degaussing Coil XS804 XP804 XSK02 Cord Plug XP803 - + XS803 XP803 XPY01 Cord Plug XPY01 XS402 To Deflection Yoke B A Cord Plug XPS06 Power PCB Assembly XPS06 XPA02 round T's G To CR Wire XSY01 XPA01 XPY03 XSY03 XSA01 Cord Plug XPY03 XSA02 XPA03 CRT RGB PCB Assembly AV PCB Assembly + Main PCB Assembly XKW01A Cord Plug K02 Cord Plug K01 Co
APPENDIX 4 £ºFINAL ASSEMBLY OF At3208 or or or 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Serial No.
6/24/2003 APEX DIGITAL TELEVISION In-Warranty Schedule by Model LIMITED WARRANTY 1 Product Model No.
