Subscribe to Our Youtube Channel
Related Manuals for Apex Digital AT2008S
Summary of Contents for Apex Digital AT2008S
-
Page 1: Service Manual
SERVICE MANUAL FILE NO. SM-CTV-O-043 COLOR TELEVISION SERVICE MANUAL MODEL NO. AT2008S/AT2008 CHASSIS NO. CN-12C1 Please read this manual c arefully before service PRINTED IN CHINA.MAY.2003 ©... -
Page 2: Table Of Contents
SERVICE MANUAL CONTENTS SAFETY INSTRUCTIONS ..............SPECIFICATIONS ................KEY ICS AND ASSEMBLIES ............SYSTEM BLOCK DIAGRAMS............IC DATA AND WAVEFORMS OF KEY POINTS ......CIRCUIT ADJUSTMENTS............... SET-UP ADJUSTMENTS ..............SERVICE MODE AND BUS DATA..........TROUBLESHOOTING FLOW CHARTS.......... SERVICE SPARE PARTS LIST ............APPENDIX 1. -
Page 3: Safety Instructions
SERVICE MANUAL SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRE CAUTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIO NS 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 4 SERVICE MANUAL continued SAFETY INSTRUCTIONS 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 5: Specifications
Channels preset: Antenna input: (unbalanced) Picture tube: Effective screen dimensions: 406mm×305mm (15.98×12.01 in.) (Approx.) Audio output: 2W+2W (for AT2008S only); 2W×2 (for AT2008 only) (THD 7%) Power source: 120Vac 60Hz Weight: 25kg (55 lbs) (Approx.) Dimensions (W/H/D): 566×450×477mm (22.28×17.72×18.78 in.) (Approx.) Packing dimensions (W/H/D): 640×531×540mm (25.20×20.91×21.26 in.) (Approx.) -
Page 6: System Block Diagrams
SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (CONTINUED) - Page 7 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (CONTINUED)
- Page 8 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (CONTINUED)
- Page 9 SERVICE MANUAL SYSTEM BLOCK DIAGRAMS (CONTINUED)
-
Page 10: Ic Data And Waveforms Of Key Points
SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS LA76814 Small Signal Processing IC 1. Introduction of LA76814 IC LA7684 is a NTSC-M only system color TV specific monolithic IC developed by SANYO Co., which is controlled by Inter IC Bus. LA76814 includes a IF processing circuit, a luminance and chroma signal processing circuit, horizontal/frame scanning small signal processing circuit etc. - Page 11 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS 2. Block Diagram 3. Refer to Table 2 about Functions and Service Data of LA76814 s Pins.
- Page 12 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA7057AQ (N181) 2×8W Stereo BTL Audio Output Amplifier with DC Volume Control 1. Features 2. General Description DC volume control The TDA7057AQ is a stereo BTL output amplifier with Few external components DC volume control.
- Page 13 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) TDA7056B(N181) 5W mono BTL audio amplifier with DC volume contro l 1 .Features 2. General Description DC volume control The TDA7056B is a mono Bridge-Tied Load (BTL) Few external components output amplifier with DC volume control.
- Page 14 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 0.42 s -On-chip ROM capacity Program ROM:64K/56K/48K/40K bytes CGROM: 16K bytes...
- Page 15 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) AT24C08 (D702) EEPROM 1. Features 2. Pin Configuration 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...
- Page 16 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) LA7840 (N301) Vertical Deflection Output Circuit 1. Features Low power dissipation due to built-in pump-up circuit Vertical output circuit Thermal protection circuit built in Excellent crossover characteristics DC coupling possible 2.
- Page 17 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) M52470AP (NS181) 4-Input 3-Channel Analog Switch 1. Description The M52470AP is a semiconductor integrated circuit containing an analog switch designed for use in a video system. It contains two audio switches and one video switch.
- Page 18 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 2 Functions and Service Data of LA76814 (N101)’s Pins GDM8145 Multimeter Ground Resistance (K ) Measure with red Measure with Function Description Pin No. Voltage of probe while black probe while Pin (V) grounding black grounding red...
- Page 19 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Not connected OSD gain control 0.59 0.59 Deflection circuit ground X-ray detector filter 6.46 6.09 Killer filter 7.06 APC filter of sub-carrier restorer 6.95 6.46 3.58 MHz sub-carrier signal output terminal 7.32 6.56 External 3.58MHz crystal oscillator...
- Page 20 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 3 Functions and Service Data of TDA7057AQ (N181)’s Pins GDM8145 Multimeter Ground Resistance (K ) Measure with red Measure with Pin No. Function Description Voltage of probe while black probe while Pin (V) grounding black grounding red...
-
Page 21: Data Line
SERVICE MANUAL 4.02 Supply voltage terminal Button-control voltage input terminal 5.23 AFT voltage input terminal Ground Button-control voltage input terminal 4.69 4.46 Reset terminal 12.27 5.21 Filter 12.47 5.62 Video signal input terminal 16.8 Vertical flyback pulse input terminal 16.7 5.09 Horizontal flyback pulse input terminal 5.04... - Page 22 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Table 5 Function and Service Data of AT24C08 (D702)’s Pins Digital Multimeter: Victor DT890D Function Description Pin No. Reference Voltage (V) Positive Resistance (KΩ) Negative Resistance (KΩ) Address terminal 0 Address terminal 1 Address terminal 2 Ground...
- Page 23 SERVICE MANUAL (Continued) 6.85 Control level input terminal 7.38 6.22 Video signal input terminal 3 Not connected 7.47 Video signal input terminal 4 Ground 5.95 Audio signal output terminal 2 7.15 5.92 Audio signal input terminal 2-1 7.15 5.92 Audio signal input terminal 2-2 7.35 Audio signal input terminal 2-3 Audio signal input terminal 2-4...
- Page 24 SERVICE MANUAL Each Electrode Voltage of Key Triodes Position No. V511 V512 V513 V553 V581 V582 V583 V702 V703 V704 Electrode 24.5 34.5 23.9 12.5 23.8 Position No. V101 V231 VS812 VS814 V431 V432 V901 V902 V903 V904 V905 N503 Electrode 0.15 2.63...
- Page 25 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued) Waveforms of Key Points 1. D701 (5) (10) (11) (29) (30) (41) (42) 2. N101 (19) (20) (21) (23) (27) (28) (38) (46) 3. N301 (5) (2) 4. V431(B) (C), V432 (B) (C)
- Page 26 SERVICE MANUAL IC DATA AND WAVEFORMS OF KEY POINTS (continued)
-
Page 27: Circuit Adjustments
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. -
Page 28: Set-Up Adjustments
SERVICE MANUAL CIRCUIT ADJUSTMENTS (continued) 5. Focus Adjustment 1) Use the remote control to set the contrast to maximum and the brightness chroma to medium. 2) Set H. V. lines near center of Philips pattern to thinnest with the FCB on the FBT. After finishing adjustment ensure that no poor focusing exists near the center or around of the frame. - Page 29 SERVICE MANUAL SET-UP ADJUSTMENTS (continued) Yoke Fig. 11 Fig. 12 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 crosshatch test pattern. 2) Set the brightness and contrast properly. 3) Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed on the center area of the screen.
- Page 30 SERVICE MANUAL Circumference convergence adjustment 1) Loosen the clamping screw of the defection yoke slightly to allow it to tilt. 2) Temporarily put a wedge as shown in Fig. 9. (Do not remove cover paper on adhesive part of the wedge.) 3) Tilt front of the deflection yoke up or down to obtain better convergence in circumference.
-
Page 31: Service Mode And Bus Data
SERVICE MANUAL SERVICE MODE AND BUS DATA 1. How to Enter the Service Mode with the Remote Control 1) Decrease volume to 0. 2) Press the MUTE button on the remote control and VIDEO button on the TV at the same time. 3) Adjust the TV with the MENU SELECT buttons on the remote control. - Page 32 SERVICE MANUAL C.EXT EXTERNAL CHROMA C.BYPASS CHROMA BAND-PASS BYPASS C.KILL ON COLOR KILL ON MENU.05 BLANK.DEF BLANK DEFEAT BLK.ST.DEF FBP.BLK.SW FLYBACK PULSES HORIZONTAL BLANKING SWITCH FILT.SYS FILTER SYSTEM SELECT Y/C FILTER MODE VOL.FIL VOLUME FILTER VIF.SYS VIF SYSTEM VIDEO.SW VIDEO SWITCH MENU.06 R/B ANGLE R-Y/B-Y ANGLE...
- Page 33 SERVICE MANUAL b) Set the contrast to maximum and brightness to medium. c) Set the chroma to medium. Enter the TV to the Service mode. Select “SUB-BRIGHT” by pressing the buttons on the remote control and set the data to 31 by pressing the data adjustment buttons. Operate the TV for 5 minutes in the mode.
- Page 34 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS 1. The remote control doesn’t operate...
-
Page 35: Troubleshooting Flow Charts
SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 2. No raster but with sound... - Page 36 SERVICE MANUAL TROUBLESHOOTNG FLOW CHARTS (continued) 3. No picture and no sound but with rester...
- Page 37 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 4. No sound but with picture...
- Page 38 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued) 5. No color but with normal monochrome picture...
- Page 39 SERVICE MANUAL TROUBLESHOOTING FLOW CHARTS (continued)
-
Page 40: Service Spare Parts List
SERVICE MANUAL SERVICE SPARE PARTS LIST APPENDIX 1. CIRCUIT DIAGRAM 2. PRINTED CIRCUIT BOARD DIAGRAMS 3. FINAL ASSEMBLY DIAGRAM AND FINAL WIRING DIAGRAMS... - Page 41 APPENDIX 1: CIRCUIT DIAGRAM OF AT2008...
- Page 42 APPENDIX 1: CIRCUIT DIAGRAM OF AT2008S...
- Page 43 APPENDIX 2: MAIN PCB OF AT2008...
- Page 44 APPENDIX 2: CRT RGB PCB OF AT2008...
- Page 45 APPENDIX 2: MAIN PCB OF AT2008S...
- Page 46 APPENDIX 2: CRT RGB PCB OF AT2008S...
- Page 47 APPENDIX 3: FINAL WIRING DIAGRAM OF AT2008 XS803 Code Plug Front-set AV PCB ASSM Main PCB assembly XS161 Code Plug Wirelead Gray Yellow XS10B Code Plug Wirelead CRT RGB PCB Assembly XS10A Code Plug Solder Black XS601 Code Plug XS402 XS402 Code Plug XS799 Code Plug Red Wire...
- Page 48 APPENDIX 3: FINAL WIRING DIAGRAM OF AT2008S XS803 Code Plug Front-set AV PCB ASSM Main PCB assembly XS161 Code Plug XS880 Code Plug For Shanghai Novel and IRICO CRTs Only Gray Yellow XS10B Code Plug Wirelead CRT RGB PCB Assembly...
- Page 49 APPENDIX 4: FINAL DIAGRAM OF AT2008 M5 notched washer nut Tapping screw 4X20BAHCh Tapping screw 3x12VwAhCh Rubber washer Washer DP-1 C-UL lable Rear lable Warning lable Distance clip Fixed clip Black Wire clip A Black AV plate Cover board Black Back cover Black CRT RGB PCB assembly...
- Page 50 APPENDIX 4: FINAL ASSEMBLY DIAGRAM FOR AT2008S 19 19 18 18 M5 notched washer nut M5 notched washer nut 17 17 Tapping screw 4X20BAHCh Tapping screw 4X20BAHCh 16 16 Tapping screw 3x12VwAhCh Tapping screw 3x12VwAhCh 15 15 Rubber washer Rubber washer...
- Page 51 8807401001C $8.00 Speaker 56232105080 $4.00 Power Cord 53410220030 Main PCB assembly Samsung, Seg Hitachi, LG, Philips or Thai large-neck CRT (for AT2008S only) JUC7.820.690 $98.00 8667211330C01 Main PCB assembly IRICO or Shanghai Novel small-neck CRT (for AT2008S only) JUC7.820.690 $98.00...
- Page 52 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...
Need help?
Do you have a question about the AT2008S and is the answer not in the manual?
Questions and answers