JVC AV-21B16 Manuel utilisateur

SERVICE MANUAL

2006/7

COLOUR TELEVISION

YA41520067

AV-21B16

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

BASIC CHASSIS

CG4

1-2 (No.YA415)

SPECIFICATION

Design and specifications are subject to change without notice.

Items Contents

Dimensions (W ×H ×D) 59.8 cm ×47.6 cm ×47.7 cm

Mass 22 kg

TV RF System B/G, I, D/K

Colour System PAL

SECAM

NTSC 3.58 / NTSC 4.43

Receiving

Frequency

VHF Low

VHF High

UHF

CATV

46.25 MHz to 140.25 MHz

147.25 MHz to 423.25 MHz

431.25 MHz to 863.25 MHz

Mid (X to Z+2, S1 to S10) / Super (S11 to S20) / Hyper (S21 to S41) bands

Intermediate Frequency VIF 38.0 MHz (B/G, I, D/K)

SIF 32.5 MHz (5.5 MHz: B/G)

32MHz (6.0 MHz: I)

31.5MHz (6.5 MHz: D/K)

Colour Sub Carrier PAL

SECAM

NTSC

4.43 MHz

4.40625 MHz / 4.25 MHz

3.58 MHz / 4.43 MHz

Power Input AC110 V to AC240 V, 50 Hz / 60 Hz

Power Consumption 100 W (Max) / 65 W(Avg)

Picture Tube Visible size: 52.3 cm measured diagonally

( H : 41.6 cm ×V : 31.5 cm)

High Voltage 26.5 kV±1.5kV (at zero beam current)

Speaker 5 cm ×9 cm, Oval type ×1

Audio Power Output 3 W (monaural)

Aerial Input Terminal 75 Ωunbalanced, coaxial

Input Terminal

[Front / Rear]

Video

Audio

1 V(p-p), 75 Ω, RCA pin jack ×2

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

Output Terminal

[Rear]

Video

Audio

1 V(p-p), 75Ω, RCA pin jack ×1

500 mV(rms) (-4 dBs), Low impedance, RCA pin jack ×1

Headphone Jack 3.5 mm mini jack ×1

Remote Control Unit RM-C360GY (Battery size : AA / R6 / UM-3 ×2)

1-4 (No.YA415)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

PICTURE MODE

This function can adjust the picture settings automatically.

There are BRIGHT, STANDARD and SOFT in the PICTURE

MODE.

RETURN +

This function can set a channel you frequently view to the

Return Channel and you can view that channel at any time with

one-touch.

CHILD LOCK

Use this function to prevent children from operating the TV

without parental consent.

VNR

This function can reduce the picture noise.

2.2 TECHNINAL INFORMATION

2.2.1 MAIN MI-COM (CPU) PIN FUNCTION

No. Pin name I/O Function Pin

No. Pin name I/O Function

1 REMOCON I Remote control 22 PROTECT I Low B protect detection [Detect: H]

2 SDA2 I/O Data for Inter IC control (For main memory) 23 P_ON/OFF I Main power control [ON : H]

3 SCL2 O Clock for Inter IC contorl (For main memory) 24 LOCK - Not used

4 BUS_FREE - Not used 25 3.58/OTH - Not used

5 NC - Not used 26 4.5/OTH - Not used

6 KEY1 I Key scan for front key (Menu CH -/+) 27 H_SYNC I Horizontal sync

7 KEY2 I Key scan for front key (Vol -/+) 28 I/II - Not used

8 ECO IN - Not used 29 OSD_Ys O Ys (blanking) for OSD

9 AFT I AFT voltage for tuner 30 OSD_B O Blue for OSD

10 LED[POW] - Not used 31 OSD_G O Green for OSD

11 LED[TIM] O Liting for timer [Liting : H] 32 OSD_R O Red for OSD

12 GND - GND 33 NC - Not used

13 NC - Not used 34 RST I CPU reset [Reset:L]

14 NC - Not used 35 V_SYNC I Vertical sync

15 TV/V - Not used 36 TCLOCK - Not used

16 TEXT RESET - Not used 37 SDA1 I/O Data for Inter IC control (For generally)

17 ACL ON/OFF - Not used 38 SCL1 O Clock for Inter IC contorl (For generally)

18 VOL O Volume control 39 VDD I 3.3V

19 A_MUTE O Aodio muting [Muting : H] 40 OSC1 I System clock oscillation (4MHz)

20 NC - Not used 41 OSC2 O System clock oscillation (4MHz)

21 TEXT/OTH - Not used 42 VSS - GND

(No.YA415)1-5

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power cord.

(1) Remove the 6 screws [A], 1 screw [B] and 1 screw [C] as

shown in Fig.1.

(2) Withdraw the REAR COVER toward you.

CAUTION:

When reinstalling the rear cover, carefully push it inward after

inserting the MAIN PWB into the REAR COVER groove.

3.1.2 REMOVING THE MAIN PW BOARD

• Remove the REAR COVER.

(1) Slightly raise the both sides of the MAIN PWB by hand.

(2) Withdraw the MAIN PWB backward.

(If necessary, take off the wire clamp and connectors, etc.)

3.1.3 REMOVING THE SPEAKER

• Remove the REAR COVER.

(1) Remove the 2 screws [D] as shown in Fig.1.

(2) Follow the same steps when removing the other hand

SPEAKER.

3.1.4 CHECKING THE MAIN PW BOARD

• To check the back side of the MAIN PWB.

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

PW BOARD).

(2) Erect the MAIN PWB vertically so that you can easily check

its back side.

CAUTIONS:

• Before turning on power, make sure that the CRT earth wire

and other connectors are properly connected.

• When repairing, connect the DEG. COIL to the DEG.

connector on the MAIN PWB.

3.1.5 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.

1-6 (No.YA415)

Fig.1

FRONT CABINET SPEAKER

REAR COVER

MAIN PWB

SPEAKER

CRT SOCKET PWB

(Within MAIN PWB)

POWER CORD

FRONT LED PWB

(Within MAIN PWB)

(No.YA415)1-7

3.2 MEMORY IC REPLACEMENT

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video and drive circuits.

• When replacing, be sure to use an IC containing this (initial value) data.

3.2.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug from the

AC outlet.

2. Replace the memory IC

Be sure to use the memory IC written with the initial setting

values.

3. Power on

Connect the power plug to the AC outlet and switch on the

power.

4. System constant check and setting

• It must not adjust without adjustment signals.

(1) Press the [DISPLAY] key and the [PICTURE MODE]

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, again press the

[DISPLAY] key and [PICTURE MODE] key

simultaneously, and the SYSTEM CONSTANT SET

screen of Fig. 2 will be displayed.

(4) Check the setting values of the SYSTEM CONSTANT

SETTING. If the value is different, select the setting item

with the [MENU /]key, and set the correct value with

the [MENU - / +] key.

(5) Press the [DISPLAY] key twice, and return to the normal

screen.

5. Receiving channel setting

Refer to the OPERATING INSTRUCTIONS and set the

receive channels (Channels Preset) as described.

6. User settings

Check the user setting items according to the given in page

later.

Where these do not agree, refer to the OPERATING

INSTRUCTIONS and set the items as described.

7. SERVICE MENU setting

Verify what to set in the SERVICE MENU, and set whatever is

necessary (Fig.1).

Refer to the SERVICE ADJUSTMENT for setting.

Fig.1

Fig.2

POWER

123

456

789

RETURN+0-/--

PICTURE

MODE

SYSTEM

COLOUR

TV/VIDEO

CHANNEL

SCAN

OFF

TIMER

DISPLAY

CHANNEL VOLUME

MUTING

SOUND

PICTURE

MODE key

/ key

DISPLAY key

- / + key

NUMBERS

key

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.SETUP TOUR OFF

1-6 : SELECT DISP : EXIT

************ **.***

*** ** **** ***

COLOUR : TRIPLE

BILINGUAL : NO

TUNER : MU

ECO SENSOR

: NO

LANGUAGE : E/C/M/I

SYSTEM CONSTANT SET 1

: SELECT

- / + : OPERATE DISP : EXIT

B/B SOUND : OFF

LOCK : 180

COLOUR AUTO

: NO

QSS

: MINT

ALC : NO

TEXT RATE

: 20

SYSTEM CONSTANT SET 2

: SEL - / + : OPE DISP : EXIT

AMP TUNER : NO

VNR

: YES

TEXT TABLE : CYL

VOLUME PWM : POS

SYSTEM CONSTANT SET 3

: SEL - / + : OPE DISP : EXIT

SYSTEM CONSTANT- I

SYSTEM CONSTANT- II

SYSTEM CONSTANT- III

1-8 (No.YA415)

3.2.2 SETTINGS OF FACTORY SHIPMENT

3.2.2.1 BUTTON OPERATION

3.2.2.2 REMOTE CONTROL DIRECT OPERATION

3.2.2.3 REMOTE CONTROL MENU OPERATION

(1) MENU-1

(2) MENU-2

(3) MENU-3

(4) MENU-4

3.2.3 SYSTEM CONSTANT SETTING

Setting item Setting position

POWER Off

CHANNEL PR1

VOLUME 10

Setting item Setting position

CHANNEL PR1

VOLUME 10

TV/VIDEO TV

PICTURE MODE BRIGHT

COLOUR SYSTEM PAL

SOUND SYSTEM B/G

Setting item Setting position

INPUT TV

ON TIMER PR1 0:00

VNR OFF

Setting item Setting position

AUTO SHUTOFF OFF

CHILD LOCK OFF

BLUE BACK OFF

Setting item Setting position

SETUP TOUR ON

LANGUAGE ENGLISH

Setting item Setting position

BRIGHT STANDARD SOFT

TINT 15 15 15

COLOUR 15 15 15

BRIGHT 15 15 15

CONT. 30 15 11

SHARP 151512

Setting item Setting value

COLOUR TRIPLE

BILINGUAL NO

TUNER MU

ECO SENSOR NO

LANGUAGE E / C / M / I

B/B SOUND OFF

LOCK 180

COLOUR AUTO NO

QSS MINT

ALC NO

TEXT RATE 20

AMP TUNER NO

VNR YES

TEXT TABLE CYL

VOLUM PWM POS

(No.YA415)1-9

3.2.4 SERVICE MENU SETTING ITEMS

3.2.5 REPLACEMENT OF IC301 (IF V/C DECODER)

•For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the micro-

computer in accordance with the following procedures before starting adjustment.

PROCEDURES

(1) Turn the POWER OFF.

(2) Replace the IC301 with a new one.

(3) While pressing [MENU] button and [VOL+] button ON the FRONT CABINET simultaneously, turn the POWER ON. When the

POWER is turned ON, the data is written in the micro-computer immediately.

LOCATIONS OF FRONT PANEL BUTTONS

Setting item Setting value Setting item Setting value

2. V/C 1.CUT OFF

2.DRIVE

3.BRIGHT

4.CONT.

5.COLOUR

6.TINT

7.SECAM BL ADJUST

8.SHARP [Do not adjust]

9.AMP T. SHARP [Do not adjust]

5. PRESET

[Do not adjust]

Colour System 1. C-TRAP FIX

2. SHARP PEAK

3. ABL

4. GAMMA

5. Y. DELAY TIME

6. BLACK EXP START

7. C-BPF

8. CW / SCP

9. VIF DET LEVEL

11. IF AGC MIN

12. VIF AGC

13. VIF PMOD

19. VNR

20. RGB LIM

21. RGB LIMIT LEVEL

23. TEXT H. POSITION

24. READ DATA

3. DEFLECTION 1. VER. POSITION

2. HOR. POSITION

3. VER. HEIGHT

4. VER. LINEARITY

5. VER. SCURVE

6. HOR. VCO ADJUST [Do not adjust]

4.VSM PRESET TINT

COLOUR

BRIGHT

CONT.

SHARP

Sound System 10. SIF DET LEVEL

14. SIF BPF BW ADJUST

15. SIF TRAP F0 ADJUST

16. SIF TRAP F0 ADJUST 2

17. SIF -TRAP

18. SIF -BPF

22. SIF SW

1-10 (No.YA415)

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

(No.YA415)1-11

SECTION 4

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the

conventional method using adjustment parts and

components.

(2) The adjustment using the REMOTE CONTROL UNIT is

made on the basis of the initial setting values. The

setting values which adjust the screen to the optimum

condition can be different from the initial setting

values.

(3) Make sure that connection is correctly made AC to AC

power source.

(4) Turn on the power of the TV and measuring instruments for

warming up for at least 30 minutes before starting

adjustments.

(5) If the receive or input signal is not specified, use the most

appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,

transformers and condensers) not shown in the adjustment

items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENT

Unless otherwise specified in the adjustment items, preset the

following functions with the REMOTE CONTROL UNIT.

4.3 MEASURING INSTRUMENT AND FIXTURES

(1) DC voltmeter (or digital voltmeter)

(2) Oscilloscope

(3) Signal generator

(Pattern generator : PAL / SECAM / NTSC)

(4) Remote control unit

4.4 ADJUSTMENT ITEMS

CHECK ITEM

• B1 VOLTAGE check

TUNER / IF CIRCUIT

• IF VCO adjustment

• DELAY POINT adjustment

FOCUS

• FOCUS adjustment

DEFLECTION CIRCUIT

• V.HEIGHT / V.POSITION adjustment

• H. POSITION adjustment

• V.LINEARITY / V.S-CURVE adjustment

VIDEO CIRCUIT

• WHITE BALANCE adjustment

• SUB BRIGHT adjustment

• SUB CONTRAST adjustment

• SUB COLOUR adjustment

• SUB TINT adjustment

• SECAM BALACK OFFSET adjustment

VSM PRESET SETTING

• VSM PRESET setting

Item Preset value

PICTURE MODE BRIGHT

TINT / COLOUR / BRIGHT / CONT. / SHARP Centre

VNR OFF

BLUE BACK OFF

OFF TIMER OFF

AUTO SHUT OFF OFF

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