JVC AV28S2EIBL, AV28S2EIGR, AV28S2EKBL, AV28S2EKGR Service Manual

AV28S2EKGR / AV28S2EKBL

AV28S2EIGR / AV28S2EIBL

SERVICE MANUAL

COLOUR TELEVISION

BASIC CHASSIS

AV28S2EKGR / AV28S2EKBL
AV28S2EIGR / AV28S2EIBL

JK

CONTENTS

!

SPECIFICATIONS

!

SAFETY PRECAUTIONS

!

WARNING

!

FEATURES

!

MAIN DIFFERENCE PARTS LIST

!

SPECIFIC SERVICE INSTRUCTIONS

!

SERVICE ADJUSTM ENTS

!

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

････････････････････････････････

････････････････････････････････ ････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ･･･････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ････････････････････････････････

････････････････････････････････････････････････････････････････

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

････････････････････････････････ ････

････････････････････････････････････････････････････････････････

･･･････････････････････････

･･････････････････････････････････････････････････････

････････････････････････････････ ････････

････････････････････････････････････････････････････････････････

････････････････････････････････ ･･･････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ･････････････････

････････････････････････････････････････････････････････････････

････････････････････････

････････････････････････････････････････････････

････････････････････････････････ ････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ･････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････ ･･････････････････

････････････････････････････････････････････････････････････････

････････････････････

････････････････････････････････････････

･････････････････

･･････････････････････････････････

･････････････････････

･･････････････････････････････････････････

･･････････････････

････････････････････････････････････

････････

････････････････

･･･････

･･････････････

････

････････

2
4
4
5
5

6
12
31

1-1
2-1

No.51777
Mar. 2001

A

V28S2EKGR / AV28S2EKBL

A

V28S2EIGR / AV28S2EIBL

SPECIFICATIONS

Item

AV28S2EKGR
AV28S2EKBL

Content

AV28S2EIGR

AV28S2EIBL

Dimensions ( W
Mass
TV RF System
Colour System

Stereo System
Teletext System

Receiving Frequency

Intermediate Frequency

Colour Sub Carrier Freq.

Power Input
Power Consumption

Aerial Input Term
Picture Tube
High Voltage

D )

××××H××××

VHF
UHF

VIF Carrier
SIF Carrier

PAL

NTSC

800mm×500mm×496mm
41kg
CCIR ( I )
PAL / NTSC (Only in EXT mode)

NICAM ( I )
FLOF (Fastext)

WST(Standard system)

47MHz ～ 470MHz

470MHz ～ 862MHz 470MHz ～ 862MHz

38.9MHz ( I )

32.9MHz (6.0MHz:I)

4.43MHz

3.58MHz / 4.43MHz
AC 220V～240V , 50Hz
168W(Max) / 115W(Avg),

75Ωunbalanced, Coaxial
Visible size : 66cm, M easured diagonally

1kV

+

30.0kV (at zero beam current)

-1.5kV

Speaker
Audio Output

EXT-1/EXT-2/EXT-3
(Input / Output)

EXT-4 (Input) Video

Audio(L/R)

S / Video

AUDIO OUT (Variable)

Headphone jack
Remote Control Unit

20cm×4cm Oval type×2

7.5W + 7.5W
21-pin Euro connector

(SCART socket)
1Vp-p 75Ω(RCA pin jack)

500mVrms(-4dBs), High Impedance (RCA pin jack)
Y : 1Vp-p POSITIVE (Negative sync Provided, when

terminated with 75Ω)

C : 0.286Vp-p

(Burst signal, when terminated with 75Ω)

0～1Vrms, Low Impedance
(RCA pin jack×2)

Stereo mini jack (φ3.5mm )
RM-C55 (AAA/R03 dry battery×2)

Design & specifications are subject to change without notice

.

2

No.51777

A

V28S2EKGR / AV28S2EKBL

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V28S2EIGR / AV28S2EIBL

■

■21-pin Euro connector (SCART socket) : EXT-1 / EXT-2 / EXT-3

■■

(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)

Pin

No.

Signal Designation Matching Value EXT-1 EXT-2 EXT-3

1 AUDIO R output 500mVrms(Nominal),

Low impedance

2 AUDIO R input 500mVrms(Nominal),

High impedance

3 AUDIO L output 500mVrms(Nominal),

Low impedance

4 AUDIO GND
5GND (B)
6 AUDIO L input 500mVrms(Nominal),

High impedance

7 B input
8 FUNCTON SW

(SLOW SW)

9GND (G)
10 SCL3 NC
11 G input
12 SDA3 NC
13 GND (R)
14 GND (YS)
15 R / C input

16 Ys input
17 GND(VIDEO output)
18 GND(VIDEO input)
19 VIDEO output

20 VIDEO / Y input
21 COMMON GND

700mV
Low : 0-3V, High : 8-12V, High

impedance

700mV

R : 700mV
C : 300mV
Low : 0 - 0.4, High : 1 - 3V, 75

(Negative going sync), 75

1V

P-P

(Negative going sync), 75

1V

P-P

Ω○

, 75

B-W

Ω○

, 75

B-W

Ω

, 75

B-W

Ω

, 75

P-P

Ω○

Ω○

Ω○ ○ ○

○

(TV OUT)

○○○

○

(TV OUT)

○○○

○○○

○○○

○○○

○○○

○○○

○

○

(only R)

○○○

○○○

(TV)

○○○

○

(LINE OUT)

○

(LINE OUT)

NC NC

○

NC NC

○

NC NC

○

(only C)

NC NC

○

(LINE OUT)

NC

NC

NC

NC

○

(only C)

NC

[

Pin assignment

]

No.51777

3

A

V28S2EKGR / AV28S2EKBL

A

V28S2EIGR / AV28S2EIBL

SAFETY PRECAUTIONS

1. The design of this product contains special hardware and 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 personnel
only.

2. Alterations of the design or circuitry of the product 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 product have special
safety-related characteristics. These characteristics are often not
evident from visual inspection nor can the protection afforded by
them necessary be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts which

WARNING

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 schemati cs and by (!)
on the Parts List in the 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 m ay cause shock, fire, or ot her
hazards.

4. The leads in the products are routed and dressed with ties,
clamps, tubing’s, barriers and the like to be separated from live
parts, high temperature parts, moving parts and / or sharp edges
for the prevention of electric shock and fire hazard. When
service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been
returned to normal, after re-assembling.

1. The equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check sett i ng for local voltage.

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No.51777

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A

FEATURES

V28S2EKGR / AV28S2EKBL

V28S2EIGR / AV28S2EIBL

By preference, users can select the picture size from REGULAR,

"

PANORAMIC, FULL, 14:9 ZOOM, 16:9 ZOOM, 16:9 ZOOM SUB
TITLE modes. When the TV unit received WSS picture signal, the
picture can be changed to 16:9 ZOOM mode automatically.

The TELETEXT SYSTEM has a built-in FASTEXT and WST

"

system.

Because this TV unit corresponds to multiplex broadcast, users

"

can enjoy music programs and sporting events with live realism.
In addition, BILINGUAL programs can be heard in their original
language.

TV EXT-1 EXT-3

EXT-2

Built-in ECO (ECONOMY, ECOLOGY) MODE.

"

In accordance with the brightness in a room, the brightness
and/or contrast of the picture can be adjusted automatically to
make the optimum picture which is easy on the eye.

Users can make VCR dubbing of picture and sound by controlling

"

the AV selector to select an opt ional source at the EXT-2 output
shown in figure.

EXT-4

MAIN DIFFERENCE PARTS LIST

Model Name

!!!!

Part Name

MAIN PWB SJK-1911A-U2 ← SJK-1711A-U2 ←

AV SEL. PWB SJK0S911A-U2

!

RATING LABEL LC20091-020A-U LC20091-025A-U LC20091-039A-U LC20091-040A-U

EURO LABEL AEM1052-016-E AEM1052-015-E AEM1052-013-E AEM1052-002-E

!

INST BOOK LCT0895-001A-U

REG. SHEET AEM3148-001-E

REMOCON WINDOW LC3120 3-001A-C LC31203-001B-C LC31203-001A-C LC30203-001B-C

FRONT FRAME LC11007-001B-U LC11007-002B-U LC11007-001B-U LC11007-002B-U

AV28S2EKGR AV28S2EKBL AV28S2EIGR AV28S2EIBL

←

←

←×←

SJK0S711A-U2

LCT0896-001A-U

←

←

No.51777

5

A

V28S2EKGR / AV28S2EKBL

A

A

A

V28S2EIGR / AV28S2EIBL

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power cord.

2. Remove the 10 screws marked ”A” as shown in the Fig. 1.

3. Withdraw the rear cover toward you.

REMOVING THE SIDE CONTROL JACK ASSEMBLY

After removing the rear cover.

"

1. Remove the screw marked B as shown in the Fig.1.

2. While slightly raise the side control jack assembly, rem ove the 2
claws under the side control jack assembly.

3. Disconnect the connector “SR”, “SL”, “S”, “F” and “K” as shown
in Fig 2.

REMOVING THE SIDE CONTROL PWB

After removing the rear cover and side control jack assembly.

"

1. Remove the 3 claws “C” from back side of the side control jack
assembly as shown in Fig.2.

2. Pull out the SIDE CONTROL PWB.

REMOVING THE CHASSIS

After removing the rear cover.

"

1. Slightly raise the both sides of the chassis by hand and remove
the two claws under the both sides of the chassis from the front
cabinet.

2. Withdraw the chassis backward.
(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE SPEAKER BOX

After removing the rear cover.

"

1. Remove the 2 screws marked ”D” as shown in Fig. 1.

: W hen removing the screws marked D of the speaker box

NOTE

assembly, remove the lower side screw first, and then
remove the upper one.

2. Remove the 2 screws “E” attaching the speaker box.

3. Remove the 2 screws “F” attaching the speaker.

4. Follow the same steps when removing the other hand speaker.

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

"

1. Remove the 3 screws marked ”G” as shown in the Fig. 1.

2. Remove the claws marked “H” under the CHASSIS as shown in
Fig. 3.

3. While raising the claw marked “I”, remove the top of the AV
TERMINAL BOARD slightly in the direction of arrow ”J” as
shown in Fig. 3.

CHECKING THE PW BOARD

To check the back side of the PW Board.

1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).

2) Erect the chassis vertically so t hat you can easily check the
back side of the PW Board.

[CAUTION]

When erecting the chassis, be careful so that there will be no

"

contacting with other PW Board.

Bef ore turning on power, make sure that the wire connector is

"

properly connected.

When conducting a check with power supplied, be sure to confirm

"

that the CRT EARTH WIRE (BRAIDED ASS’Y ) is connected to
the CRT SOCKET PW board.

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

2. Never remove the cable tie used for tying the wires together.
Should it be inadvertently removed, be s ure to tie the wires with
a new cable tie.

Connector

SR
SL
S

F

K

Fig. 2

J

V TERMINAL

BOARD

C

SIDE CONTROL
PWB

C

I

H

H

V SEL. PWB

Fig. 3

6

No.51777

A

A

FRONT CABINET

CRT
SOCKET
PWB

FRONT
CONTROL
PWB

V28S2EKGR / AV28S2EKBL

V28S2EIGR / AV28S2EIBL

SPEAKER

D

F

SPEAKER
BOX

E

Fig. 2

SIDE
CONTROL
JACK
ASSEMBLY

B

SPEAKER

AV SEL. PW B

D

SPEAKER
BOX

CONTROL BASE

CLAW

F

E

CLAW

AV TE RMINAL
BOARD

G

POWER &

DEF. PWB

CHASSIS

MAIN PWB

REAR COVER

Fig. 1

No.51777

A

7

A

V28S2EKGR / AV28S2EKBL

A

A

A
A

A

A

V28S2EIGR / AV28S2EIBL

REMOVING THE CRT

Replacement of the CRT should be performed by 2 or more

!

persons.

After removing the cover, chassis etc.,

"

1. Putting the CRT change table on soft cloth, the CRT change table
should also be covered with such soft cloth (shown in Fig.4).

2. While keeping the surface of CRT down, mount the TV set on the
CRT change table balanced will as shown in Fig.5.

3. Remove 4 screws marked by arrows with a box type sc rew dri ver
as shown in Fig.5.

Since the cabinet will drop when screws have been removed, be

"

sure to support the cabinet with hands.

4. After 4 screws have been removed, put the cabinet slowly on
cloth (At this time, be carefully so as not to damage the front
surface of the cabinet) shown in Fig.6.

The CRT should be assembled according to the opposite

"

sequence of its dismounting steps.

The CRT change table should preferably be smaller that the CRT

!

surface, and its height be about 35cm.

About CRT Spacer

!

An appropriate CRT spacer should be used in the corresponding
CRT in accordance with the type of the CRT.
When a CRT is replaced, special attention shoul d be paid to this
matter.

CRT CHANGE TABLE

PPROX.

35cm

CLOTH

Fig. 4

COATING OF SILICON GREASE FOR ELECTRICAL
INSULATION ON THE CRT ANODE CAP SECTION.

Subsequent to replacement of the CRT and HV transformer or

"

repair of the anode cap, etc. by dismounting them, be sure to
coat silicon grease for electrical insulation as shown in Fig.7.
Wipe around the anode button with clean and dry cloth. (Fig.7)
Coat silicon grease on the section around the anode butt on. At
this time, take care so that any silicon greases dose not stick to
the anode button. (Fig.8)

★★★★

Silicon grease product No. KS - 650N

CRT

node button

Silicon grease

coating

CABINET

pprox.
20mm (Do not
coat grease on
this section

node button
(No sticking of
silicon grease)

Fig. 5

CRT

CRT
CHANGE TABLE

Fig. 6

Silicon grease
should be coated
by 5mm or more
from the outside
diameter of
anode cap.

Coating position
of silicon grease

node cap

Fig. 7 Fig. 8

8

No. 51777

A

A

REPLACEMENT OF CHIP COMPONENT

CAUTIONS

!

1. Avoid heating for more than 3 seconds.

2. Do not rub the electrodes and the resist parts of the pattern.

3. When removing a chip part, melt the solder adequately.

4. Do not reuse a chip part after removing it.

SOLDERING IRON

!

1. Use a high insulation soldering iron with a thin pointed end of it.

2. A 30w soldering iron is recommended for easily removing parts.

REPLACEMENT STEPS

!

How to remove Chip parts

1.

####

Resistors, capacitors, etc

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with tweezers and remove the chip part.

####

Transistors, diodes, variable resistors, etc

(1) Apply extra solder to each lead.

V28S2EKGR / AV28S2EKBL

V28S2EIGR / AV28S2EIBL

2. How to install Chip parts

####

Resistors, capacitors, etc

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the solder.

Then heat and melt the solder at both ends of the chip part.

####

Transistors, diodes, variable resistors, etc

(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder.

A

(3) First solder lead

as indicated in the figure.

SOLDER

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove the
chip part.

Note : After removing the part, remove remaining solder from the

pattern.

SOLDER

No.51777

A

C

(4) Then solder leads

A

C

B

and C.

B

B

9

A

V28S2EKGR / AV28S2EKBL

A

V28S2EIGR / AV28S2EIBL

REPLACEMENT OF MEMORY ICs

1. Memory ICs

This TV use memory ICs. In the memory ICs, there are memorized data
for correctly operating the video and def lection circuits. When replacing
memory ICs, be sure to use ICs written with the initial values of data.

2. Procedure for replacing memory ICs

PROCEDURE

(1) Power off

Switch the power off and unplug the power cord from the wall outlet.

(2) Replace ICs.

Be sure to use memory ICs written with the initial data values.

(3) Power on

Plug the power cord into the wall outlet and switch the power on.

(4) Check and set SYSTEM CONSTANT SET:

It must not adjust without signal.

****

1) Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously.

2) The SERVICE MENU screen of Fig. 1 will be displayed.

3) While the SERVICE MENU is displayed, press the
INFORMATION key and MUTING key simultaneously, and the
SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

4) Check the setting val ues of the SYSTEM CONSTANT SET of
Table 1. If the value is different, select the setting item with the
FUNCTION UP/DOWN key, and set the correct value with the
FUNCTION -/+ key.

5) Press the MENU key to memorize the setting value.

6) Press the INFORMATION key twice, and return to the normal
screen.

SERVICE MENU

1. IF 2. V/C

3. AUDIO 4. DEF

5. VSM PRESET 6. VPS

7. AUTO PROGRAM (OFF)

1-7 : SELECT : EXIT

Fig.1

SYSTEM CONSTANT SET

MODEL=JK_EURO (V

COUNTRY :
INCH :
MODEL : **

OK

- + : STORE : EXIT

JVC JK EURO V00

******** - *****

Fig.2

*.****

**
**

)

(5) Setting of receive channels

Set the receive channel.
For setting, refer to the OPERATING INSTRUCTIONS.

(6) User settings

Check the user setting values of Table 2, and if setting value is
different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.

(7) Setting of SERVICE MENU

Verify the setting items of the SERVICE MENU of Table 3, and reset
where necessary.
For setting, refer to the SERVICE ADJUSTMENTS.

10

No. 51777

NAME OF REMOTE CONTROL KEY

Names of key

INFORMATION

key

iiii

MUTING

MENU

OK

FUNCTION UP/DOWN

▼

FUNCTION -/+

▼

▼

▼