JVC AV-28BK5ECB Manual de usuario

SERVICE MANUAL

COLOUR TELEVISION

Power source AC 220~240V 50Hz

Power consumption(watts) Maximum : 155

Average : 120

Standby : 1.5

Television system CCIR B/G

Colour system PAL on Air

PAL/NTSC3.58/NTSC4.43 in AV

mode

Channel coverage E2-E12, E21-E69, S1-S41,

X, Y, Z, Z+1, Z+2,

A-H, H+1, H+2

Sound-multiplex systems A2 (B/G) system

Teletext systems FLOF (Fastext), TOP, WST (World

Standard System)

AV terminal

21-pin terminals AV1: CENELEC Standard with

RGB

AV2: CENELEC Standard with S-

inputs

Front AV terminals AV3: RCA Terminal, Video and

Audio(L/R) Input

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

1 2 3

4 5 6

7 8 9

RM-C80

BASS

P.MODE

. MODE

/OK

No. 51758

Oct. 2000

AV-28BK5ECB

AV-28BK5ECS

SPECIFICATIONS:

AV-28BK5ECB

AV-28BK5ECS

1: An isolation transformer should be connected in the

power line between the receiver and the AC line

when a service is performed on the primary of the

converter transformer of the set.

2: Comply with all caution and safety-related notes

provided on the cabinet back, inside the cabinet, on

the chassis or the picture tube.

3: When replacing a chassis in the cabinet, always be

certain that all the protective devices are installed

properly, such as, control knobs, adjustment covers

or shields, barriers, isolation resistor-capacitor

networks etc.Before returning any television to the

customer, the service technician must be sure that it

is completely safe to operate without danger of

electrical shock.

2No. 51758

SAFETY PRECAUTION

X-RADIATION PRECAUTION

The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially

constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must

be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous

X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this

service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,

take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high

voltage adjustment to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver.

Components indicated by mark in the parts list and the schematic diagram designate components in which

safety can be of special significance. It is particularly recommended that only parts designated on the parts list in

this manual be used for component replacement designated by mark . No deviations from resistance wattage

or voltage ratings may be made for replacement items designated by mark .

CONTENTS

Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chassis description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 ~ 9

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Option Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Service adjustments [Feature Setting] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Service adjustments [Adjustment Mode]-[Adjustment] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 ~ 16

Component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 ~ 19

CPU port functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 ~ 20

IC block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 ~ 26

Parts description and reading in schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Service parts lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ~ 40

Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 ~ 2-17

No. 51758 3

AV-28BK5ECB

AV-28BK5ECS

This is a basic diagram for all models and therefore differs slightly from the actual block diagram.

ROM

46 45 44 23

SCART1

AV1

SCART2

AV2

FRONT

MONITOR-

OUT SC1 V-IN

FRONT V-IN

SC2Y-IN

SC1-IN

POWER-ON

KEY-IN

MUTE

POWER FAIL DETECT IN

RC IN

SC2-IN

SC3-IN

SC2 C-IN

IC1201

MM1313BD

TV-OUT

R/G/B/BLK

SCL/SDA

IC101

IF/VIDEO/

CHROMA/

MARTIX

39 34 18 20 21 47

CVBS-OUT

Y-OUT

C-OUT

CVBS-2-IN

BLK

Aerial

Tuner X132

SAF

Q131 85

171 70

100

IC7201

SCAN

CONVERTER

FIELD

MEMORY

IC7202

FIELD

MEMORY

IC7203

911 1416

2Y-OUT

2U-OUT

2V-OUT

IC241

IC351

MATRIX

DEFLECTION

24 844

38 37 36 35 3

10 11

SDA/SCL

SCL/SDA

IC801

CPU

RGBBLK

OSD

BGR

BLK

IC711

TDA6101

IC721

TDA6101

IC731

TDA6101

BVIDEO-OUT

GVIDEO-OUT

RVIDEO-OUT

358

RCRT

IC501

H-DRIVE

E-W

Q402

T401A

H-DRIVE

Q271

Q272

Q273

V DRIVE -

V DIRVE+

PCC

CONTROL

H-OUTPUT

Q411

FOCUS

SCREEM

T402

FLYBACK

D.Y

VERT

OUTPUT

653

SELECTOR

IC802

I2C BUS

2VD-OUT

2HD-OUT

MEMORY

SCL/SDA

Q381

TV-OUT H.V

IC871

–

Q471-Q461

From Scart

Outline

[Chassis Block Diagrams]

Fig.-1

CHASSIS DESCRIPTION

4No. 51758

AV-28BK5ECB

AV-28BK5ECS

IC101

IF/VIDEO/

CHROMA

IC351

MATRIX

IC241

SHARPNESS

IC801

CPU

DIGITAL

SCAN

CONVERTER

CIRCUIT

SELECTOR

CIRCUIT

SIF

Filtering

circuit

Buffer

18 20 21

30-38

Y, U, V 2(Y, U, V)

H-Sync

V-Sync

CVBS (TeleText)

2HD

2VD

External RGB in

(AV1 In)

SAW Filter

IF Stage

Video-in

C-in

Y-in

AV1

AV2

AV3

AV4

358

IC731

R-VIDEO OUT

358

IC721

G-VIDEO OUT

358

IC711

B-VIDEO OUT

RGB OSD

DISPLAY from CPU

Picture Tube

Video signal rooting

SCART1

AV1

SCART2

AV2

SCART2

AV3

FRONT

AV4

L/R SC3-IN

IC1201

MM1313

IC3501

MM1369 3D

SURROUND

PROCESSOR

3D SUPPER

SPEAKER

HEADPHONE

JACK

Q001

IC3451

TDA9875

Q3472

Q3471

IC001

TDA7263M AUDIO

AMP

310

MUTE

24 52

IC101

TDA9321

SCL/SDA

DIGITAL TV

SOUND

PROCESSOR

L/R

TV-OUT

MONITOR

OUT SC1-IN

SC2-IN

L/R

Q1241

Q1242

Q1251

Q1252

FROM

CPU

L/R

TV-IN

SIF

MONO

Tuner Q131

X131

SAF

Aerial

L/R

FRONT 4-IN 25

L/R

IF/VIDEO/

CHROMA

44 5

IF/VIDEO/

CHROMA

SELECTOR

ACTIVE 3D SURROUND PROCESSING

Audio signal rooting

Fig.-2

Fig.-3

CHASSIS DESCRIPTION

No. 51758 5

AV-28BK5ECB

AV-28BK5ECS

IC801

CPU

IC871

ROM

CVBS input

Q649

RL649

Power

Supply

Circuit

OSD

RGB Drive

H-Sync

V-Sync

61 60 48 49 44-47 43

RC Pre-amp.

I2C BUS

AV1 SW in

AV2 SW in

AV3 SW in

19 20 21 23 24

Key SW

Input

38 Power

Failuer

Detect

Power ON/OFF

DIGITAL

SCAN

CONVERTER

H-Drive

Q401-Q402 T401

Drive Trans

Q411

H-Output

IC501

V-Output <LA78476N>

56 3

V-Drive +

V-Drive -

EW-Out

Q471 Q461

Vert.

Coil

Horiz.

Coil

Deflection

Yoke

T402

FlyBack Trans.

L461/L462

Pcc Control

IC351

MATRIX

DEFLECTION

2H-Sync

2V-Sync

L421

C421/C422

System control

Deflection circuit

Fig.-4

Fig.-5

CHASSIS DESCRIPTION

6No. 51758

AV-28BK5ECB

AV-28BK5ECS

IC7202

Video Memory

IC7203

Video Memory

IC7204

PLL

<READ>

IC7201

DOUBLE SCAN CONVERTER

IC7205

PLL

<WRITE>

LPF

Q7301-Q7304

LPF

Q7311-Q7314

LPF

Q7321-Q7324

LPF

Q7371-Q7374

LPF

Q7361-Q7364

LPF

Q7351-Q7354

IC7341

Inverter

2VD

2HD

100

717068635953

Digital scan circuit

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)

- MC74HC04AFP, IC7341

invertor

The Y-signal output from IC101 is sent to pin 85 of IC7201<TC90A36F>, field progressive

converter, after controlling the amplitude level and band-pass limiting by the circuit consist of

Q7301, Q7302, Q7303, Q7304 and 8MHz LPF. The U/V-signal are also controlling the amplitude

level and band-pass limiting by the circuit consist of Q7311, Q7312, Q7313, Q7314, Q7321,

Q7322, Q7323, Q7324 and 4MHz LPF respectively. The U-signal is sent to pin 90 of IC7201and

the V-signal is sent to pin 92 of IC7201. The HD signal is sent to pin 63 of IC7201 with positive

polarity through IC7341 for shaping the waveform. The VD-signal is sent to pin68 of IC7201 with

negative polarity through IC7341.

The Y-signal input to IC7201 is converted from A to D in 8bit and output from pins 31 to 50 of

IC7201 to pins 1 to 4 and 24 to 27 of IC7203<MSM51822A>, video memory, for writing.

[Digital Scan Operation]

Fig.-6

CHASSIS DESCRIPTION

No. 51758 7

AV-28BK5ECB

AV-28BK5ECS

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.

The signals are wrote down to memory IC by 16MHz clock. It means the number of sampling are

1024 per 1H. The clock signal for writing is obtained by performing the phase comparing AFC

control to the HD-signal. The phase comparing AFC control performs at IC7205<TLC2932I>, PLL,

and IC7201. The 32MHz clock signal generated here is supplied from pin 3 of IC7205 and sent to

pin 61 of IC7201. The clock signal divided to 16MHz in the IC is output to pin 31 and supplied to

pins 6 of IC7202 and IC7203.

The reading is performed by 32MHz clock supplied from pin 28 of IC7201. In this case, the

number of sampling is 2048 per 1H. This read clock signal is obtained by performing the

frequency comparing AFC control to the input HD-signal. To avoid the skew distortion, the phase

comparing AFC control is not employed. The frequency comparing AFC control is performed at

IC7204<TLC2932I>, PLL, and IC7201. The 32MHz clock signal generated here is output from pin

3 of IC7205 and sent to pins 56 of IC7201 and IC7203.

The Y/U/V-signals are converted in progressive as the writing for 16MHz and reading for 32MHz.

The progressive V-signal output from pins 10 to 13 and 15 to 18 of IC7202 is supplied to pins 9 to

16. Also, the progressive U/V-signals output from pins 10 to 13 and 15 to 18 of IC7203 are

supplied to pins 43 to 50 of IC7201 and separated with U-signal and V-signal. And then, Y/U/V-

signals are converted in D to A in IC7201 and output to pin 6 as analogue Y-signal, pin 98 as

analogue V-signal and pin 100 as analogue V-signal respectively. The HD-signal progressive

converted in IC7201 is output from pin 71 of IC7201, the VD-signal progressive converted in

IC7202 is output from pin 70 of IC7201. The output HD and VD signals are sent to IC202 with

positive polarity through the IC7341 for waveform shaping.

The Y-signal output from IC7201 is controlled the amplitude level and band-pass limiting at the

circuit consist of Q7351, Q7352, Q7353, Q7354 and 16MHz LPF. The U/V-signals are also

controlled the amplitude level and band-pass limiting at the circuit consist of Q7361, Q7362,

Q7363, Q7364, Q7371, Q7372, Q7373, Q7374 and 8MHz LPF and these signals are sent to

IC201.

50Hz 100Hz

AA' BB' C

A' = A, B'= B

(a) Normal Scan (b) Double Scan

Fig.-7

CHASSIS DESCRIPTION

8No. 51758

AV-28BK5ECB

AV-28BK5ECS

B-Y9

Y0Y1Y2Y3Y4

1024 sampling

sampling clock= 16MHz = 1024/1 horiz.

Y0Y1Y2Y3Y4

R-Y0

B-Y0B-Y1B-Y2B-Y3B-Y4

R-Y4

R-Y3

R-Y2

R-Y1R-Y0B-Y1R-Y2B-Y3R-Y4

Write

Time divided multiplex

Y0Y1Y2Y3Y4

R-Y0B-Y1R-Y2B-Y3R-Y4

Y5Y6Y7Y8Y9

B-Y5R-Y6B-Y7 R-Y8

R-Y0

B-Y1

R-Y2

B-Y3

R-Y4R-Y4

B-Y5

R-Y6

B-Y7

R-Y8R-Y0

B-Y1B-Y3

R-Y2

B-Y7

R-Y6

B-Y9

R-Y8

B-Y5B-Y9

2048 sampling

Double

Scan

Converting

sampling clock = 32MHz = 2048/1 horiz.

Read out in double clock

(a) Write (b) Read

(c)

Fig.-8

CHASSIS DESCRIPTION

No. 51758 9

AV-28BK5ECB

AV-28BK5ECS

5V Reg

CONVERTER TRANS

C609

Q613

OSC

Control

Rectifier

AC SW601

MAINS SW T681

RL649

RELAY

5VRC

D681

Q611

D610 R641

IC631

30V

D637

D635

D3450

D634

D636

D633

D632

D631

Q649

IC651

200V

T402

FLYBACK TRANS

HighVoltage

FocusVoltage

ScreenVoltage

CRT

Heater

D100

D7381

D651

D652

D1200

D856 D857

POWER ON/OFF

ON:HI

POWER ON

D459

D491

Video Out

Q411

Q853

Q851

Q852

8V Reg

T611

CPU

IC801

28 29

H-OUTPUT

130V Reg

35V

130V

-15V

IC652

12V

12V Reg

IC100

IC3450

IC7381

15V

Power Supply Lines

Power Failuer Detection Lines

12V Reg

IC681

IC1201

9V Reg

D456D457/D458

7.9V

High Voltage Detection

Power Failure detection

POWER FAILURE DETECTION

HOLD DOWN

Power supply & Protection circuit

Fig.-9

CHASSIS DESCRIPTION

10 No. 51758

AV-28BK5ECB

AV-28BK5ECS

CABINET BACK DISASSEMBLY

1. Remove 8 screws (A) and 2 screws(B).

2. Pull out the cabinet back. (A)

(A)

(A) (B)

DISASSEMBLY

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