JVC AV-28BK5ECB Service Manual

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SERVICE MANUAL
1
2
3
4
5
6
7
8
9
0
CS
CS
BASS
BASS
P. MODE
. MODE / OK
OK
P
AV
AV
MENU
MENU
P
RM-C80
TV
SPECIFICATIONS:
Power source
Power consumption(watts) Maximum : 155
Television system
Colour system
Channel coverage
Sound-multiplex systems
Teletext systems
AV terminal
21-pin terminals
Front AV terminals

COLOUR TELEVISION

AV-28BK5ECB
AV-28BK5ECS
AC 220~240V 50Hz
Average : 120
Standby
: 1.5
CCIR B/G
PAL on Air
PAL/NTSC3.58/NTSC4.43 in AV
mode
E2-E12, E21-E69, S1-S41,
X, Y, Z, Z+1, Z+2,
A-H, H+1, H+2
A2 (B/G) system
FLOF (Fastext), TOP, WST (World
Standard System)
AV1: CENELEC Standard with
RGB
AV2: CENELEC Standard with S-
inputs
AV3: RCA Terminal, Video and
Audio(L/R) Input
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
Sound output (watts)
Rated Power output :5.0 x 2
Picture tubes (cm)
66 (measured diagonally)
Headphone jack
Stereo mini-jack (3.5 mm in
diameter)
Speakers (cm)
(5 x 9)oval x 2
Dimensions (WxHxD mm) 736 x 595.5 x 500
Weight (kg)
32.5
Accessories
Remote control handset x 1
AAA/R03 dry cell battery x 2
Specifications subject to change without notice.
AV-28BK5ECB
AV-28BK5ECS
No. 51758
Oct. 2000

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  Summary of Contents for JVC AV-28BK5ECB

  • Page 1: Colour Television

    AV-28BK5ECB AV-28BK5ECS SERVICE MANUAL COLOUR TELEVISION AV-28BK5ECB AV-28BK5ECS BASS BASS P. MODE . MODE / OK MENU MENU RM-C80 SPECIFICATIONS: Power source AC 220~240V 50Hz Sound output (watts) Rated Power output :5.0 x 2 Power consumption(watts) Maximum : 155 Picture tubes (cm)
  • Page 2: Table Of Contents

    AV-28BK5ECB AV-28BK5ECS CONTENTS Safety precautions ..............2 Chassis description .
  • Page 3: Chassis Description

    AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION [Chassis Block Diagrams] This is a basic diagram for all models and therefore differs slightly from the actual block diagram. Outline Fig.-1 No. 51758...
  • Page 4 AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION Video signal rooting IF Stage IC101 IC241 IC351 IF/VIDEO/ SHARPNESS MATRIX CHROMA <TDA9178> <TDA9330H> <TDA9321H> SAW Filter IC731 R-VIDEO OUT <TDA6101Q> Y, U, V 2(Y, U, V) DIGITAL SCAN IC721 CONVERTER G-VIDEO OUT H-Sync CIRCUIT <TDA6101Q>...
  • Page 5: System Control

    AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION System control RL649 Q649 Power CVBS input Supply Power ON/OFF Circuit 60 48 49 44-47 43 Key SW Input IC871 IC801 Power Failuer Detect RC Pre-amp. AV1 SW in AV2 SW in AV3 SW in I2C BUS Fig.-4...
  • Page 6 AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION [Digital Scan Operation] 100Hz Digital Scan Converter circuit 100Hz converter circuit consists of the following ICs. - TC90A36F, IC7201 Field Progressive Converter - MSM518221A, IC7202, IC7203 Video Memory - TLC2932I, IC7204, IC7205 PLL (Phase Locked Loop)
  • Page 7 AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION 50Hz 100Hz A' = A, B'= B (b) Double Scan (a) Normal Scan Fig.-7 The U/V-signals are converted in progressive at multiplexer and converted from A to D in 8 bit, and then applied from pins 34 to 41 of IC7201 to pins 1 to 40 and 24 to 27 of IC7203 <MSM518221A>, video memory, for writing.
  • Page 8: Read Out In Double Clock

    AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION sampling clock= 16MHz = 1024/1 horiz. sampling clock = 32MHz = 2048/1 horiz. 1024 sampling 2048 sampling 2048 sampling Double Scan Converting (a) Write (b) Read Write Time divided multiplex Read out in double clock B-Y7 R-Y Fig.-8...
  • Page 9 AV-28BK5ECB AV-28BK5ECS CHASSIS DESCRIPTION Power supply & Protection circuit Fig.-9 No. 51758...
  • Page 10: Disassembly

    AV-28BK5ECB AV-28BK5ECS DISASSEMBLY CABINET BACK DISASSEMBLY 1. Remove 8 screws (A) and 2 screws(B). 2. Pull out the cabinet back. No. 51758...
  • Page 11: Option Settings

    AV-28BK5ECB AV-28BK5ECS OPTION SETTINGS This TV set allows to set up the following option settings. PROHIBITION Prohibit the presetting and sets the current volume as the maximum volume level. PROHIBITION OFF or START POSITION Presets the programme position when the set is switched on.
  • Page 12: Service Adjustments [Feature Setting]

    AV-28BK5ECB AV-28BK5ECS SERVICE ADJUSTMENTS [After replacing the Menory IC (IC802)] The memory IC, IC802, stores the feature setting data of TV set and service adjustments data for each circuit, therefore, when the memory IC is replaced, it should be performed by following “FEATURE SETTING” and “ADJUSTMENT”.
  • Page 13: Service Adjustments [Adjustment Mode]-[Adjustment]

    AV-28BK5ECB AV-28BK5ECS SERVICE ADJUSTMENTS [ADJUSTMENT MODE] Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the adjustments are carried out by using the RC handset. IMPORTANT NOTICE Do not attempt to adjust service adjustments not listed on the above otherwise it may cause loss of performance and product safety.
  • Page 14 AV-28BK5ECB AV-28BK5ECS SERVICE ADJUSTMENTS [ADJUSTABLE SERVICE ADJUSTMENT] IMPORTANT NOTICE Do not attempt to change the data value of service items not listed below table otherwise it may cause loss of performance and product safety. If you can not restore the data value of each service item, please initialize the memory IC following to the below description “INITIALIZATION OF MEMORY IC”...
  • Page 15 AV-28BK5ECB AV-28BK5ECS SERVICE ADJUSTMENTS [ADJUSTMENT] How to adjust the each service data, please see “ADJUSTMENT MODE” on page 13 for entering the service mode , selecting service item and adjusting the service data value. IMPORTANT NOTICE Do not attempt to adjust the following service adjustments except requiring the readjustments in servicing otherwise it may cause loss of performance and product safety.
  • Page 16 AV-28BK5ECB AV-28BK5ECS SERVICE ADJUSTMENTS VERTICAL ADJUSTMENT PINCUSHION ADJUSTMENT VERTICAL CENTRING ADJUSTMENT 1. Receive circle (or cross-hatch) pattern. 1. Receive circular pattern. 2. Enter to the service mode and select mode “SHAPE”, 2. Enter to the service mode and select mode “SHAPE, item “SHAPE 4.EWP”.
  • Page 17: Component Locations

    AV-28BK5ECB AV-28BK5ECS COMPONENT LOCATIONS KB SCAN CONVERTER HOP & SHARPNESS IC001 IC501 D413 D412 T611 R442 No. 51758...
  • Page 18: Component Locations

    AV-28BK5ECB AV-28BK5ECS COMPONENT LOCATIONS TU & SIGNAL BOARD IC801 IC871 IC1211 IC891 IC101 T132 TUNER A101 T131 TPAGC IC3501 TPVIDEO SCAN CONV. BOARD HOP BOARD IC7201 IC7203 IC351 IC241 IC7202 IC7341 K73B K73A No. 51758...
  • Page 19: Cpu Port Functions

    AV-28BK5ECB AV-28BK5ECS CPU PORT FUNCTIONS Pin No. Function Name Function IN/OUT MMU0 MMU3 ADDR10 Address bus 10 ADDR11 Address bus 11 ADDR9 Address bus 9 ADDR8 Address bus 8 OSC-IN Clock Input OSC-OUT Clock Output ADDR13 Address bus 13 ADDR14...
  • Page 20 AV-28BK5ECB AV-28BK5ECS Pin No. Function Name Function IN/OUT WSCF VDD-A PXFM RESET Reset Input MCFM JTRSTO TXCF CVBS0 TEST0 CVBS1 CVBS2 GND-A DAT3 Data bus 3 DAT4 Data bus 4 DAT5 Data bus 5 DAT6 Data bus 6 DAT7 Data bus 7...
  • Page 21: Ic Block Diagrams

    AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC001 TDA7263M <Audio Output> CF COUPL RF1 27K IN -L OUT L IN +L MUTE PROTECTION REFERENCES TURN-ON SUPPLY AND-OFF PROTECTION VOLTAGE IN +R OUT R IN -R TDA7263M RF1 27K CF COUPL IC101 TDA9321H <IIC bus controlled TV input processor>...
  • Page 22: Ic Block Diagrams

    AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC241 TDA9178T <YUV Picture Improvement> IC351 TDA9330H <IIC bus controlled TV display processor> No. 51758...
  • Page 23 AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC711, IC721, IC731 TDA6101Q <Video Output> IC801 ST92R195 <CPU> No. 51758...
  • Page 24 AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC1211 MM1313BD <AV Selector> IC3451 TDA9870A <Digital TV Sound Processor> No. 51758...
  • Page 25 AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC3501 MM1369BD <3D Surround Processor> Lout SIMULATED STEREO VIRTUAL AUDIO MM1369AD QXPANDER PROCESSOR SIMULATED STEREO Rout IC7201 TC90A36F <Digital Scan Converter> No. 51758...
  • Page 26 AV-28BK5ECB AV-28BK5ECS IC BLOCK DIAGRAMS IC7202, IC7203 MSM518221A <Field Memory> IC7204, IC7205 TLC2932 <PLL> No. 51758...
  • Page 27: Parts Description And Reading In Schematic Diagram

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