SERVICE MANUAL - Wiki Karat
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1. EKIS S DVD switch Not used No 51709 1 7 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE Note Before starting work disconnect the power plug from the wall outlet HOW TO REMOVE THE REAR COVER 1 Remove the 10 screws marked A 2 Remove the rear cover backward CRT SOCKET PWB MAIN PWB FRONT CABINET MEMORY IC REPLACEMENT 1 Important After replacing the MEMORY IC 702 certainly use the JVC REMOTE CONTROL UNIT to turn on the power 2 If other maker DAEWOO REMOTE CONTROL UNIT is initially used there is risk the TV set will no longer operate with the JVC REMOTE CONTROL UNIT 3 If the TV set is initialized to operate with the other maker DAEWOO REMOTE CONTROL UNIT there is need to yet again replace the MEMORY IC IC702 1 8 No 51709 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES SERVICE ADJUSTMENTS BEFORE ADJUSTMENT AND MAINTENANCE 1 Don t short any two soldering points or connect any component while TV set is power on 2 Withdraw power plug before maintenance 3 In order to ensure safety all components replaced should be identical For further details refer to the component name and component No in PARTS LIST 4 Must be warm up the set for 30 minutes or more and degauss CRT thoroughly with demagnetizer c2. m I 0 I 5 col col AI n5 al ol z U 2 9 c o E 1 1 4 1 1 1 1 4 1 10 No 51709 Fig A screen SERVICE Black R menu item Setting value Fig B AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES ADJUSTMENTS B VOLTAGE CHECK 1 Receive the standard colour bar signal 2 Connect digital voltmeter between of B1 Line circuit and GND 3 Confirm that voltage is DC 142V 2 0V SCREEN Set TV in AV mode without video signal Black screen Set WP Red WP Green and WP Blue equal to 32 Set Black Black equal to 8 Set TV in normal mode Adjust SCREEN VR on FBT such that the highest cathode cut off voltage measured on CRT SOCKET PWB ASS Y is DC 140V 5V apron WHITE BALANCE NOTE Confirm SCREEN Adjustment has been adjusted LOW LIGHT Input the 10 step gray scale signal include 1096 Black Enter the SERVICE MODE Turn the SCREEN VR on FBT gradually to where the 2nd gray bar 10 Black faintly visible Adjust Black B and Black not to the colours on the gray bar HIGH LIGHT 5 Apply the white signal 6 Adjust R DRIVE and G DRIVE so that the picture becomes white Reo FOCUS 1 Input the crosshatch pattern signal 2 Adjust the FOCUS VR on FBT to have the best resolution on
3. x 2 VIDEO AUDIO VHS AV2 Input terminals in front and rear side are common INTERMEDIATE FREQUENCIES PIF 38 9MHz B G D K I L 33 9MHz L SIF 33 4MHz PAL SECAM B G 32 9MHz PAL SECAM 1 I 32 4MHz PAL SECAM D K SECAM L 40 4MHz SECAM L E SOUND SUBCARRIER 58MHz PAL SECAM B G CS 6 0MHz PAL SECAM 6 5MHz PAL SECAM D K SECAM L 6 5MHz SECAM L COLOUR SUBCARRIER 4 43 2 PAL 4 250MHz 4 406MHz SECAM REMOTE CONTROL 48B00RMC71 Battery AAA R03 EP EPS EE EES 48B00RMC72 Battery R03 EKIS DIMENSIONS W x Hx D 760mm x 589mm x 475mm MASS 32kg Design amp specifications are subject to change without notice 1 2 No 51709 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES 21 Euro connector SCART socket 21 pin EURO SCART 1 ES Signal Designation Matching Value Audio Output Right 0 5V rms Impedance 1kQ RF 54 MOD 2 Audio Input Right 0 5V rms Impedance gt 10k Q 3 Audio Output Left 0 5V rms Impedance lt 1kQ RF 54 MOD 4 Audio Earth 5 Blue Earth 6 Audio Input Left 0 5V rms Impedance gt 10kQ 7 Blue Input 0 7V p p 0 1V Impedance 75Q 8 Slow Switching TV 0 2V AV 16 9 4 5 7V AV 4 3 9 5 12V Impedance gt 10kQ 9 Green Earth 10 NC 11 Green Input 0 7V p p 0 1V Impedance 75
4. AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES JVC SERVICE MANUAL COLOUR TELEVISION AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES Please throw it out the service manual for AV 28BD5EKI EKIS EP EPS EE EES issued Jun 2000 and use this service manual No 51709 Oct 2000 CONTENTS B SPECIFICATIONS 1 2 SAFETY PRECAUTIONS rc tr A A n een eee hn 1 5 B FUNCTIONS ees cee eee tate eee eae eed 1 6 B SPECIFIC SERVICE INSTRUCTIONS cette e I HM I I Ihm 1 8 m SERVICE ADJUSTMENTS n n M M A I hh hn 1 9 STANDARD CIRCUIT DIAGRAM APPENDIX m nnn 2 1 E PARTS TIST cwn 1 13 COPYRIGHT 2000 VICTOR COMPANY OF JAPAN LTD Po 31709 Oct 2000 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES SPECIFICATIONS ee TV RF SYSTEM B G D K amp L L COLOUR STANDARD PAL SECAM NTSC AV only POWER INPUT AC 230V 50Hz POWER CONSUMPTION 75W 3W Stand by TELETEXT SYSTEM FLOF Fastext TOP WST standard system SOUND OUTPUT SPEAKER 8Q x2 PICTURE TUBE SIZE VISIBLE AREA 66cm measured diagonally ANTENNA INPUT 750 Unbalanced NPUT OUTPUT FRONT AV2 RCA JACK VIDEO AUDIO REAR AV1 AV2 21 EURO CONNECTOR SCART
5. Q 12 13 Red Earth 14 Blanking Earth 15 Red Input 0 7V p p 0 1V Impedance 75Q 16 Fast Switching 0 0 4V Logic 0 1 3V Logic 1 Impedance 75Q 17 Video Out Earth 18 Video In Earth 19 Video Output 1V p p 3dB Impedance 75Q 20 Video Input 1V p p 3dB Impedance 75 21 Common Earth Pin assignment No 51709 1 3 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES 21 pin EURO SCART 2 AV2 ES Signal Designation Matching Value 1 NC 2 Audio Intput Right 0 5V rms Impedance 10k Q 3 NC 4 Audio Earth 5 Earth 6 Audio Input Left 0 5V rms Impedance gt 10kQ 7 NC 8 NC 9 NC 10 NC 11 NC 12 NC 13 Earth 14 Earth 15 Chroma Input 3dB for a luminance signal of 1V p p 16 NC 17 Earth 18 Video In Earth 19 NC 20 Video Input Y In 1V p p 3dB Impedance 75Q 21 Common Earth 1 4 Pin assignment No 51709 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES SAFETY PRECAUTIONS The design of this product contains special hardware many circuits and components specially for safety purposes For continued protection no changes should be made to the original design unless authorized in writing by the manufacturer Replacement parts must be identical to those used in the original circuits Service should be performed by qualified
6. atus oscilloscope etc the LIVE side GND and ISOLATED NEUTRAL side GND or EARTH side GND at the same time If above note will not be kept a fuse or any parts will be broken 5 If any repair has been made to the chassis it is recommended that the B setting should be checked or adjusted See B ADJUSTMENT 6 The high voltage applied to the picture tube must conform with that specified in Service manual Excessive high voltage can cause an increase in X Ray emission arcing and possible component damage therefore operation under excessive high voltage conditions should be kept to a minimum or should be prevented If severe arcing occurs remove the AC power immediately and determine the cause by visual inspection incorrect installation cracked or melted high voltage harness poor soldering etc To maintain the proper minimum level of soft X Ray emission components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product 7 Do check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kQ 2W resistor to the anode button 8 When service is required observe the original lead dress Extra precaution should be given to assure correct lead d
7. oil before adjustment EQUIPMENT FOR ADJUSTMENT 1 Pattern Generator 2 Digital volt meter 3 Oscilloscope 4 Demagnetizer 5 Remote control unit OCORA 999 48 00 71 48 00 72 Remote Control unit No 51709 1 9 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES BASIC OPERATION OF SERVICE MENU How to ENTER and EXIT from SERVICE MODE 1 Press the MUTING KEY and RECALL KEY of the REMOTE CONTOROL UNIT at the same time to display the service MENU screen shown Fig A and Fig B 2 When exiting from the SERVICE MODE turn the power switch off How to set SERVICE MODE 1 Select the setting item you want to change with the P A P W key on the REMOTE CONTROL UNIT The item you selected will be indicated by YELLOW on the display 2 When changing the set values use the on the REMOTE CONTROL UNIT 3 When the setting has been completed turn the power switch off The changed set values are stored in memory SERVICE MENU screen selection Press the P A P W key select menu item The letters of the selected items are displayed in yellow Press the 4 key eee setting the value No Adjustment item gt O ey D o E w D Q A z 5 2 o o a v o 5 U w lt I 0
8. personnel only 2 Alterations of the design or circuitry of the products should not be made Any design alterations or additions will void the manufacturer s warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom 3 Many electrical and mechanical parts in the products have special safety related characteristics These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety characteristics are identified in the parts list of Service manual Electrical components having such features are identified by shading on the schematics and by A on the parts list in Service manual The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock fire or other hazards 4 Don t short between the LIVE side ground and ISOLATED NEUTRAL side ground or EARTH side ground when repairing Some model s power circuit is partly different in the GND The difference of the GND is shown by the LIVE 1 side GND the ISOLATED NEUTRAL side GND and EARTH side GND Don t short between the LIVE side GND and ISOLATED NEUTRAL side GND or EARTH side GND and never measure with a measuring appar
9. ress in the high voltage circuit area Where a short circuit has occurred those components that indicate evidence of overheating should be replaced Always use the manufacturer s replacement components No 51709 1 5 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES FUNCTIONS LOCAL CONTROL mM FRONT OOD VIDEO L AUDIO R TV AV 21 MAIN POWER VIDEO AUDIO HEAD STAND BY REMOTE AV BUTTON VOLUME PR PROGRAM BUTTON INPUT INPUT PHONE INDICATOR SENSOR DOWN UP DOWN UP BUTTONS BUTTONS AERIAL TERMINAL e SCART JACK 1 AV1 f SCART JACK 2 AV2 I AVI AV2 1 6 No 51709 REMOTE CONTROL UNIT TV mode POWER NUMBER 0 9 NUMBER P MODE OK AV UP RIGHT MENU DOWN LEFT MUTING RECALL SLEEP Not used MOVE SKIP TV TEXT DELETE MODE VCR DVD switch VCR DVD Control buttons AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES TELETEXT mode 48B00RMC71 POWER EP EPS EE EES NUMBER 0 9 10 INDEX Not used UP SUBPAGE MENU DOWN HOLD MUTING REVEAL SIZE CANCEL GREEN RED TV TEXT YELLOW 48B00RMC72 EXAM
10. screen VERTICAL GEOMETRY Adjust V Amp V Shift and V Slope V Slope V S Cor to compensate for vertical distortion HORIZONTAL PICTURE CENTERING Adjust H Shift to have the picture in the center of the screen No 51709 1 11 AV 28BD5EKI AV 28BD5EP AV 28BD5EE AV 28BD5EKIS AV 28BD5EPS AV 28BD5EES EAST WEST CORRECTION Adjust H Parall H Bow H Widdth EW Parabo Up Corner Dw Corner EW Trapez to compensate for geometrical distortion Up Corner H Width Dw Corner EW Trapez 1 12 No 51709
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