Apex Digital AT2408S Service Manual
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Apex Digital AT2408S Service Manual

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  • Page 1 This file is provided FREE OF CHARGE from the electromaniacs.com community You are free to distribute this file to other persons who needs it , but without of charge Also on http://electromaniacs.com you can find thousands of service manuals , schematics free of charge...
  • Page 2 SERVICE MANUAL FILE NO. SM-CTV-O-044 COLOR TELEVISION SERVICE MANUAL MODEL NO. AT2408S/AT2408 CHASSIS NO. CH-10C1(S) Please read this manual carefully before service PRINTED IN CHINA.MAY.2003 ©...

  • Page 3: Table Of Contents

    SERVICE MANUAL CONTENTS SAFETY INSTRUCTIONS...................1 SPECIFICATIONS .......................2 KDEY ICS AND ASSEMBLIES..................3 SYSTEM BLOCK DIAGRAMS..................4 IC DATA AND WAVEFORMS OF KEY POINTS ............5 CIRCUIT ADJUSTMENTS...................5 SET-UP ADJUSTMENTS ....................5 SERVICE MODE AND BUS DATA ................5 TROUBLESHOOTING FLOW CHARTS..............7 SERVICE SPARE PARTS LIST .................13 APPENDIX 1.

  • Page 4: Safety Instructions

    SERVICE MANUAL SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTICE” INSTRUCTION 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.
  • Page 5 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 cannot necessarily be obtained by using replacements rated at higher voltages or wattage, etc.

  • Page 6: Specifications

    Channels preset: Antenna input: 75 (unbalanced) Picture tube; Effective screen dimensions: 478mm×363mm (18.82×14.29 in.) Max. audio output; 5W×2 (for AT2408 only); 5W+5W (for AT2408S only) Power source; 120Vac 60Hz Weight: 31.5kg (69 lbs) (Approx.) Dimensions(W/H/D): 660×522×458mm (25.98×20.55×18.03 in.) (Approx.) Packing dimensions(W/H/D): 740×610×545mm (29.13×24.02×21.46 in.) (Approx.)

  • Page 7: System Block Diagrams

    SERVICE MANUAL SYSTEM BLOCK DIAGRAMS...
  • Page 8 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (continued)
  • Page 9 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (continued)
  • Page 10 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (continued)

  • Page 11: Ic Data And Waveforms Of Key Points

    SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS TDA 4605 Control IC for Switched-Mode Power Supplies Using MOS-Transistor 1. Features Fold-back characterisitics provides overload protection for external components Burst operation under secondary short-circuit condition implemented Protection against open or a short of the control loop Switch-off if line voltage is too low (undervoltage switch-off) Line voltage depending compensation of fold-back point Soft-start for quiet start-up without noise generated by the transformer...
  • Page 12 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) CH04T1002/ CH04T1009 1. Terminal Assignment Layouts Fig. 12 CH04T1002/ CH04T1009 DIP42S Terminal Assignment Layoutd Fig. 13 CH04T1002/ CH04T1009 QIP48E Terminal Assignment Layout...
  • Page 13 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) CH04T1002/ CH04T1009 (continued) 2. Terminal Function Table 2 Terminal Function Table Terminal Function Description Option Format Negative power supply Input terminal for crystal oscillation Output terminal for crystal oscillation Positive power supply Reset terminal FILT Charge-pump ouput terminal...
  • Page 14 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) CH04T1002/CH04T1009 (continued) Terminal Function Description Option Format 4-bit input/output port Port 7 Each bit can be independently programmable Other functions: INTO input/HOLD release input /Nch-Tr. output for watchdog timer INT1 input/HOLD release input INT2 input/timer 0 event input INT3 input (noise rejection filter attached input)/timer 0 event input...
  • Page 15 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) EEPROM AT24C04 1. Features 2. Pin Configuration Data EEPROM internally organized as 512 bytes and 32 pages×16 bytes Low power CMOS Vcc=2.7 to 5.5V operation Two wire serial interface bus C-Bus compatible Filtered inputs for noise suppression with...
  • Page 16 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) OM8839PS/TDA8843-N2 C-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 circuit with series are I2C-bus controlled single chip TV alignment-free PLL demodulator without external...
  • Page 17 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) OM8839PS/TDA8843-N2 (continued) 4. Block Diagram 5. Refer to Table 6 about Functions and Data of the IC’s Each Pin.
  • Page 18 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA8350Q DC-coupled Vertical Deflection and East-West High EMC immunity due to common mode Output Circuit inputs 1. Features Temperature (thermal) protection Few extemal components East-West output stage with one single Highly efficient fully DC-coupled vertical output conversion resistor.
  • Page 19 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA7057AQ 2×8W Stereo BTL Audio Output Amplifier with DC Volume Control 1. Features General Description ·DC volume control The TDA7057AQ is a stereo BTL output amplifier with DC ·Few external components volume control.
  • Page 20 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA6107Q Triple Video Output Amplifier 1. Features 2. General Description ·Typical bandwidth of 5.5 MHz for an output The TDA6107Q includes three video output signal of 60 V (p-p) amplifiers in one plastic DIL-bent-SIL 9-pin ·High slew rate of 900 V/S medium power (DBS9MPF) package (SOT ·No external components required...
  • Page 21 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4052 Dual 4-channel Analog Multiplexer/Demultiplexer 1. Description With LOW, one of the four switches is selected The HEF4052 is a dual 4-channel analog (low impedance ON-state) by A and A .
  • Page 22 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4052 (continued) Fig. 22 Schematic Diagram (One Switch) 3. Function Table Inputs Channel none Notes H=HIGH state (the more positive voltage) L=LOW state (the less positive voltage) X=state is immaterial Ratings Limiting values in accordance with the Absolute Maximum System (IEC 134) Supply voltage (with reference to V...
  • Page 23 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4053 Triple 2-channel Analog Multiplexer/Demultiplexer 1. Description selected The HEF4053 is a triple 2-channel analog (low impedance ON-state) by Sn. With multiplexer/demultiplexer with a common enable HIGH, all switches are in the high impedance input ( ).
  • Page 24 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) HEF4053 (continued) Pinning to Y Independent inputs/outputs Independent inputs/outputs 1A to to S Select inputs Enable input (active LOW) to Z Common inputs/outputs Fig. 20 Pinning Diagram 3. Function Table Inputs Channel HEF4053P(N): 16-lead DIL;...
  • Page 25 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 3 Functions and Service Data of TDA4605 (N811)’s Pins Digital Multimeter Pin No. Function Description Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ) Regulation control 0.713 Primary current input 1.34 9.71 1.34...
  • Page 26 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Data line 1 4.41 7.03 5.09 Overload detecting input terminal 6.95 5.13 Input terminal for selectable production 9.62 5.29 modes Not connected 9.56 5.46 Remote control input 4.64 9.22 5.33 Not connected 9.58 Not connected...
  • Page 27 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Audio signal output 9.24 5.98 Decoupling capacitor connection Video input 9.12 5.94 Black current control input 5.81 9.22 5.88 Blue (B) signal output 3.04 6.19 Green (G) signal output 6.19 5.23 Red (R) signal output 5.26...
  • Page 28 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 7 Functions and Service Data of TDA8350 (N401)’s Pins Digital Multimeter Pin No. Function Description Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ) Vertical drive input (positive) 2.32 5.84 Vertical drive input (negative) 5.87...
  • Page 29 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 10 Functions and Service Data of HEF4052 (DS01)’s Pins Digital Multimeter Pin No. Function Description Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ) Switch input Switch input Switch output Switch input Switch input Inhibit terminal...
  • Page 30 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Note : The TV receives NTSC color bar with 1KHz sine wave audio reception in Normal mode when measuring voltage and resistance with a GDM-8145 multimeter (Max. resistance: 20 KΩ, Max. DC voltage: 20V).
  • Page 31 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued)
  • Page 32 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Measure with a GOS-622G oscilloscope.
  • Page 33 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued)

  • Page 34: Circuit Adjustments

    SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Base Collector Emitter Serial No. Type Serial No. Type Input Reference Output V104 C388A 2.12 8.35 1.35 N861 LM317 11.56 7.37 8.63 V609 C1815 2.99 8.47 2.29 V601S C1815 2.54 6.94 1.88 N863...
  • Page 35 SERVICE MANUAL A degaussing coil is mounted around the CRT so that external degaussing after moving the TV is generally unnecessary, providing it is properly degaussed upon installation. The degaussing coil operates in about 1 second after power on. If the set is moved or faced to a different direction, the power switch must be switched off for at least 30 minutes in order that the automatic degaussing circuit operates properly.

  • Page 36: Set-Up Adjustments

    SERVICE MANUAL 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 3. White Balance Note: The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to Fig.
  • Page 37 SERVICE MANUAL SET-UP ADJUSTMENTS SET-UP ADJUSTMENTS (continued) (continued) 6-pole Magnet Fixed 4-pole Magnet Adjust the Angle (Vertical Lines) Rotate Two Tabs At the Same Time (Horizontal Lines) Purity Magnet Adjustment of Magnets Convergence Magnet Assembly Fig. 27 Fig. 27 2. Convergence Adjustment 2.

  • Page 38: Service Mode And Bus Data

    SERVICE MANUAL SET-UP ADJUSTMENTS (continued) 9) Stick three adhesive tapes on wedges as shown in Fig. 26. BLU Red Red/BLU GRN Red/BLU 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.
  • Page 39 SERVICE MANUAL Auto Limit OSDH·POS AV PRESCAL SPATIAL ROM CORREC VOLUME V CENTER ST SPECTRL SUB TINT MSP/TDA Blank HOB V AMP ST TIM CVR OPT STEREO Press the button to select data in turn and button to decrease or increase data.
  • Page 40 SERVICE MANUAL G.DRIVE GREEN DRIVE B.DRIVE BLUE DRIVE MENU.02 H.AFC HORIZONTAL APC GIAN H.BLK.L HORIZONTAL BLANKING LEFT H.BLK.R HORIZONTAL BLANKING RIGHT CROS.B/W CROSSHATCH BLACK/WHITE VIDEO.LVL VIDEO LEVEL FM.LEVEL FM LEVEL MENU.03 FM.MUTE FM MUTE AUDIO.MUTE AUDIO MUIE VIDEO.MUTE VIDEO MUTE SND.TRAP SOUND TRAP MENU.04...
  • Page 41 SERVICE MANUAL RG.GAM.DEF MENU.07 BRT.ABL.TH BRIGHT ABL THRESHOLD EM.ABL.DEF BRT.ABL.DF BRIGHT ABL DEFEAT MID.STP.DF BRIGHT MID STOP DEFEAT MENU.08 DIGITAL.OSD DIGITAL OSD MODE OSD.CONT OSD CONTRAST CONTROL OSD.H.POS OSD HORIZONTAL POSITION MENU.09 H.FREQ HORIZONTAL FREQUENCY C.KILL.OFF COLOR KILL OFF AUDIO.SW AUDEO SWITCH T.DISBLE TEST MODE SWITCH DISABLE...

  • Page 42: Troubleshooting Flow Charts

    SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS 1. Power 1.1 The power indicator lights but with no raster and sound. 1.2 The SMPS has no voltage output.
  • Page 43 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 1.3 The SMPS outputs low voltage and indicator doesn’t light. 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.
  • Page 44 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 2.2 No character appears on the screen. 2.3 Channel number remains unchanged during auto program. 3. Video Signal Processor 3.1 No color...
  • Page 45 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 3.2 The color is abnormal. 4. Horizontal/Vertical Scan Circuit 4.1 No raster...
  • Page 46 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.
  • Page 47 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 4.4 The field amplitude of raster is not enough. 4.5 East-west pincushion distortion 5. Audio System 5.1 No sound...

  • Page 48: Service Spare Parts List

    SERVICE MANUAL SERVICE SPARE PARTS LIST APPENDIX 1. CIRCUIT DIAGRAM 2. FINAL WIRING DIAGRAM 3. FINAL ASSEMBLY DIAGRAM 4. PRINTED CIRCUIT BOARD DIAGRAMS...
  • Page 49 APPENDIX 1: CIRCUIT DIAGRAM OF AT2408 (1)
  • Page 50 APPENDIX 1: CIRCUIT DIAGRAM OF AT2408 (2)
  • Page 51 APPENDIX 1: CIRCUIT DIAGRAM OF AT2408S (1)
  • Page 52 APPENDIX 1: CIRCUIT DIAGRAM OF AT2408S (2)
  • Page 53 APPENDIX 2: MAIN PCB OF At2408...
  • Page 54 APPENDIX 2: MAIN PCB OF AT2408S...
  • Page 55 APPENDIX 2: PCB OF AT2408 CRT RGB PCB AV PCB POWER PCB...
  • Page 56 APPENDIX 2: PCB OF AT2408S CRT RGB PCB AV PCB POWER PCB...
  • Page 57 APPENDIX 3: FINAL WIRING DIAGRAM OF AT2408 XPK01 Cord Plug XPK02 XP804 Cord Plug DY PCB Assembly From Right Speak From Left Speaker XSK02 XSK01 To Degaussing Coil XS802 XS804 Main PCB Assembly Black Cord Plug Cord Plug XS804 XP205 Cord Plug XP205 Cord Plug...
  • Page 58 APPENDIX 4: FINAL ASSEMBLY OF AT2408...
  • Page 59 APPENDIX 4: FINAL ASSEMBLY OF AT2408S...
  • Page 60 Group component lists of AT2408&AT2408S Part name CRT Type Old Part number TYPE:K12C-C1; When using CH04T1002 CPU (for AT2408S only) K12C-C1 Remote control TYPE:K12K-C2; When using CH04T1009 CPU (for AT2408S only) K12K-C2 Remote control TYPE:K12B-C2; When using CH04T1002 CPU (for AT2408 only)
  • Page 61 New Part number List 8201800271L $15.00 8201801682L $15.00 $15.00 8201800032L $15.00 8201800271L 8537000370C01 $98.00 $98.00 8537000370C02 $43.26 8611604570C 8807400230C $11.88 8667206130C04 $102.00 $102.00 8667206130C05 $23.82 8667206140C02 $11.88 8667206160C01 $11.88 8667206160C02 8667206150C01 $11.88 8667206120C $28.80...
  • Page 62 6/24/2003 APEX DIGITAL TELEVISION In-Warranty Schedule by Model Carry-In Stock REIMBURSEMENT RATES LIMITED WARRANTY In Home Service Repair Product Model No. Carry-In Home Service Stock Remote Parts Labor Yes/No Yes/No Yes/No Control Minor Major Minor Major Repair 13 inch AT1302...

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