JVC AV-28F3SJ Bedienungsanleitung

SERVICE MANUAL

2005/2

FLAT COLOUR TELEVISION

YA22520052

AV-28F3SJ

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

1-2 (No.YA225)

SPECIFICATION

Design & specifications are subject to change without notice.

Item Content

Dimensions ( W ×H ×D ) 80.5cm ×49.5cm ×48.6cm

Mass 41.0kg

TV RF System CCIR (I)

Colour System TV Mode PAL

Video Mode PAL / NTSC 3.58 / NTSC 4.43

Sound System A2 / NICAM

Teletext System FLOF (Fastext) / TOP / WST

Receiving Frequency VHF

CATV

46.25MHz - 863.25MHz

S01 - S41

Intermediate Frequency VIF

SIF

38.9MHz (I)

32.9MHz (6.0MHz)

Colour Sub Carrier Frequency PAL (4.43MHz), NTSC (3.58MHz / 4.43MHz)

Power Input AC220V - AC240V, 50Hz

Power Consumption 145W (Max)

Aerial Input Terminal 75Ωunbalanced, coaxial

Picture Tube Size Visible size : 66cm (Measured diagonally) (H: 58.3cm ×V: 33.0cm)

16:9 wide aspect

High Voltage 29kV (at zero bean current)

Speaker Main: 6.0cm ×16cm, Oval type ×2 / Tweeter: 8Ω, 15W) ×2

Audio Output 10W + 10W (THD 10%)

EXT-1 Input / Output 21-pin Euro connector (SCART socket) ×1

EXT-2 Input / Output 21-pin Euro connector (SCART socket) ×1

EXT-3 Input / Output 21-pin Euro connector (SCART socket) ×1

EXT-4 Input Video

Audio (L/R)

1V(p-p) 75Ω, RCA pin jack ×1

500mV(rms) (-4dBs), High Impedance, RCA pin jack ×2

Headphone jack Stereo mini jack 3.5mm ×1

Remote Control Unit VE-30021286 (RM-C1512S), (AA/R06 dry battery ×2)

(No.YA225)1-3

21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2 / EXT-3

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

Pin No. Signal designation Matching value EXT-1 EXT-2 EXT-3

1 AUDIO R output 500mV(rms) (Nominal),

Low impedance Used (TV OUT) Used (LINE OUT) Not used

2 AUDIO R input 500mV(rms) (Nominal),

High impedance Used (R1) Used (R2) Used (R3)

3 AUDIO L output 500mV(rms) (Nominal),

Low impedance Used (TV OUT) Used (LINE OUT) Not used

4 AUDIO GND --- Used Used Used

5 GND (B) --- Used Used Used

6 AUDIO L input 500mV(rms) (Nominal),

High impedance Used (L1) Used (L2) Used (L3)

7 B input 700mV(B-W), 75 ΩUsed Not used Not used

8 FUNCTION SW (SLOW SW) Low : 0V-3V

High : 8V-12V, High impedance Used Used Used

9 GND (G) --- Used Used Used

10 SCL / T-V LINK --- Not used Used

(SCL / T-V LINK) Not used

11 G input 700mV(B-W), 75 ΩUsed Not used Not used

12 SDA3 --- Not used Used Not used

13 GND (R) --- Used Used Used

14 GND (YS) --- Used Not used Not used

15 R / C input R : 700mV(B-W), 75 Ω

C : 300mV(P-P), 75 ΩUsed (R) Used (C2 / R) Used (C3)

16 Ys input (FAST SW) Low : 0V-0.4V, 75 Ω

High : 1V-3V, 75 ΩUsed Not used Not used

17 GND (VIDEO output) --- Used Used Used

18 GND (VIDEO input) --- Used Used Used

19 VIDEO output 1V(P-P) (Negative sync),75 ΩUsed (TV OUT) Used (LINE OUT) Not used

20 VIDEO / Y input 1V(P-P) (Negative sync), 75 ΩUsed Used Used

21 COMMON GND --- Used Used Used

20 18 16 14 12 10 8 6 4 2

21 19 17 15 13 11 9 7 5 3 1

[Pin assignment]

1-4 (No.YA225)

SECTION 1

PRECAUTION

1.1 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 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 ( ) 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 may cause shock,

fire, or other 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.

WARNING

(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 setting for local voltage.

(No.YA225)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

• It is a remote controlled colour television.

• It can tune cable channels.

• Controlling the TV is very easy by its menu driven system.

• It has Euroconnector sockets for external device (such as

video recorder, video games, audio set, etc.)

• Stereo sound systems are available.

• Full function Teletext (Fastext, Toptext, WST).

• AUTO PROGRAM (Automatic Programming System).

• All programs can be named.

• Forward or backward automatic tuning.

• Sleep timer.

• Child Lock.

• Blue Background

• Panoramic mode

• Comb FIlter

• CTI (Colour Transient Improvement)

•T-VLink

• Automatic sound muting when no transmission.

• 5 minutes after the broadcasting (close down), the TV switches

itself automatically to stand-by mode.

• WSS (Wide Screen Signaling)

1-6 (No.YA225)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

(1) Unplug the power cord.

(2) Remove the 8 screws [A].

(3) Remove the 4 screws [B].

(4) Withdraw the REAR COVER toward you.

3.1.2 REMOVING THE BACK DOOR

• Remove the REAR COVER.

(1) Remove the 2 screws [C].

(2) Withdraw the BACK DOOR toward you.

3.1.3 REMOVING THE SPEAKER and TWEETER

• Remove the REAR COVER.

(1) Remove the 4 screws [D], and remove the SPEAKER.

(2) Remove the other hand SPEAKER in the same steps.

(3) Remove the 2 screws [E], and remove the TWEETER.

(4) Remove the other hand TWEETER in the same steps.

3.1.4 REMOVING THE MAIN PWB

• Remove the REAR COVER.

• Remove the BACK DOOR.

(1) Remove the 4 screws [F].

(2) Slightly raise the both sides of the MAIN PWB by hand and

withdraw the MAIN PWB backward.

[CAUTION]

If necessary, take off the wire clamp, connectors etc.

Be careful enough when developing a MAIN PWB.

3.1.5 REMOVING THE SIDE CONTROL PWB

• Remove the REAR COVER.

(1) Remove the 2 screws [G].

(2) Remove the SIDE CONTROL PWB.

3.1.6 REMOVING THE FRONT AV & HEADPHONE JACK

PWB

• Remove the REAR COVER.

(1) Remove the 2 screws [H].

(2) Remove the FRONT AV & HEADPHONE JACK PWB.

3.1.7 REMOVING THE POWER SWITCH PWB

• Remove the REAR COVER.

(1) Remove the 2 screws [I], and remove the POWER

SWITCH PWB.

3.1.8 REMOVING THE LED PWB

• Remove the REAR COVER.

(1) Remove the 2 screws [J], and remove the LED PWB.

3.1.9 CHECKING THE PW BOARD

• To check the back side of the PW Board.

(1) Pull out the PW Board. (Refer to REMOVING THE MAIN

PWB).

(2) Erect the PW Board vertically so that you can easily check

the back side of the PWB.

[CAUTION]

• When erecting the PW Board, be careful so that there will be

no contacting with other PW Board.

• Before 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 PWB.

3.1.10 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 sure to tie the wires

with a new cable tie.

(No.YA225)1-7

Fig.1

TWEETER

SPEAKER

LED PWB

POWER SWITCH PWB FRONT AV & HEADPHONE

JACK PWB

SIDE CONTROL PWB

REAR COVER

(x8)

(x4)

(x2)

(x4)

(x2)

(x4)

(x2)

BACK DOOR

MAIN PWB

CRT SOCKET PWB

CHASSIS BASE

(x2)

PICTURE TUBE

1-8 (No.YA225)

3.2 SETTING OF THE LAST MEMORY FOR SHIPMENT

3.2.1 USER SETTING VALUES

3.2.2 SETTING A.P.S. (AUTO STORE)

(1) Press [MENU] key on the remote control unit to display the main menu.

(2) Press []/[] keys to select "PROGRAM" item, them []/[] keys to display the "PROGRAM" menu.

(3) Press the [BLUE] key to enter the AUTOSTORE mode.

(4) Press []/[] keys to choose the "COUNTRY", then press []/[] keys the choose country you are nou located.

(5) Press []/[] keys to choose the "CONTINUE", then press [] key to start AUTO PROGRAM. The message screen appears.

NOTE :

To cancel the AUTO PROGRAM, press the [PICTURE] key on the remote control unit.

(6) After AUTO PROGRAM is finalized, the PROGRAM menu appears again.

(7) Press the [PICTURE] key on the remote control unit to exit main menu.

Setting item Setting value Setting item Setting value

PICTURE MENU INSTALL. MENU

BRIGHTNESS These adjust are automatically

restored when AUTO PROGRAM

bit in Service menu is set.

The procedure for setting AUTO

PROGRAM bit is described.

PROGRAMME

Refer to instruction book

CONTRAST BAND

COLOUR CHANNEL

SHARPNESS STANDARD

HUE (only NTSC) COLOUR SYSTEM

PICTURE MODE USER DECODER (EXT-2)

COLOUR TEMP NORMAL FINE TUNING

ZOOM AUTO SEARCH

STORE

SOUND MENU FEATURE MENU

BALANCE Center SLEEP TIMER OFF

BASS Center CHILD LOCK OFF

TREBLE Center LANGUAGE ENGLISH

HYPER SOUND OFF EXT-2 OUTPUT TV

BLUE BACKGROUND ON

(No.YA225)1-9

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 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.

3.3.2 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.

3.3.3 REPLACEMENT STEPS

1. How to remove Chip parts

[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 the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

(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.

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.

(3) First solder lead Aas indicated in the figure.

(4) Then solder leads Band C.

SOLDER SOLDER

1-10 (No.YA225)

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) You can make the necessary adjustments for this unit with

either the Remote Control Unit or with the adjustment tools

and parts as given below.

(2) Adjustment with the Remote Control Unit is made on the

basis of the initial setting values, however, the new setting

values which set the screen to its optimum condition may

differ from the initial settings.

(3) Make sure that AC power is turned on correctly.

(4) Turn on the power for set and test equipment before use,

and start the adjustment procedures after waiting at least

30 minutes.

(5) Unless otherwise specified, prepare the most suitable

reception or input signal for adjustment.

(6) Never touch any adjustment parts which are not specified

in the list for this adjustment - variable resistors,

transformers, condensers, etc.

(7) Presetting before adjustment.

Unless otherwise specified in the adjustment instructions,

preset the following functions with the remote control unit:

4.2 MEASURING EQUIPMENT

(1) DC voltmeter (or digital voltmeter)

(2) Signal generator (Pattern generator)

: [PAL / SECAM / NTSC]

(3) Remote control unit

4.3 ADJUSTMENT ITEM

• FOCUS ADJUSTMENT

• SCREEN ADJUSTMENT

• AGC ADJUSTMENT

• DEFLECTION CIRCUIT ADJUSTMENT

• VIDEO CIRCUIT ADJUSTMENT

4.4 ADJUSTMENT LOCATIONS

Setting item Setting value

BRIGHTNESS

Center

CONTRAST

COLOUR

SHARPNESS

COLOUR TEMP NORMAL

ZOOM AUTO

SIDE CONTROL PWB

TUNER

TU200

IC502 (MEMORY)

IC500 (MI-COM)

MAIN PWB

FRONT

FBT

UPPER : FOCUS

LOWER : SCREEN

TOP

EXT-1/EXT-2

EXT-3

P/CH

FRONT AV &

HEADPHONE

JACK PWB

POWER SWITCH

PWB

POWER SWITCH

FUSE

HEADPHONE

VIDEO

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