JVC AV-29S24/M, AV-29VS24/A, AV-29VX54/S Service Manual

SERVICE MANUAL

FLAT COLOUR TELEVISION

[AV-29VX54

[AV-29VS24/A]

]

[AV-29VS24

AV-29VS24 AV-29VS24 AV-29VX54

]

BASIC CHASSIS

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

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

3 DISASSEMBLY ....................................................................................................................................................... 1-9

4 ADJUSTMENT ...................................................................................................................................................... 1-15

5 TROUBLESHOOTING ........................................................................................................................................... 1-34

No.YA103

2004/7

SPECIFICATION

Items

Dimentions (W x H x D) 81.2cm x 58.4cm x 52.0cm

Mass 41kg 43kg

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

Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC 4.43

Video Mode PAL / SECAM / NTSC3.58 / NTSC4.43

Stereo System A2(B/G) / NICAM(B/G,I,D/K) Playback

Teletext system FLOF (Fastext), WST (World Standard Text) ---

Receiving Frequency VHF Low 46.25MHz ~ 140.25MHz (AS0 S6)

VHF High 147.25MHz ~ 423.25MHz (S7~ S36)

UHF 431.25MHz ~ 863.25MHz (S37 ~ CHINA 57)

CATV Mid: X ~ Z, S1 ~ S10

Intermediate VIF 38.0MHz

Frequency SIF

Colour Sub Carrier Frequency 4.43MHz (PAL), 4.40MHz / 4.25MHz (SECAM), 3.58MHz / 4.43MHz (NTSC)

Aerial Input Terminal 75Ω unbalanced, coaxial

Power Input AC110V ~ AC240V, 50Hz / 60Hz

Power Consumption 166W (Max.) / 109 W (Avg.)

Picture Tube

High Voltage 32kV -1.5kV / +1.0kV (at zero beam current)

Speaker 6.5cm x 13cm, oval type x 2

Audio Output 10W + 10W

Video / Audio Input S-Video [1] Mini-DIN 4pin

(1/2/3) Y : 1V (p-p), positive (negative sync provided), 75

Video / Audio Output Video 1V (p-p), 75Ω, RCA pin jack x 1

Headphone 3.5mm stereo mini jack

Remote Control Unit RM-C1281-2H RM-C1280-2H



Video [1/2/3] 1V (p-p), negative sync, 75Ω, RCA pin jack x 3

Audio [1/2/3] 500mV (rms) (-4dBs), High impedance, RCA pin jack x 6

Component RCA pin jack x 3

Video [2] Y: 1V(p-p), positive (negative sync), 75

Audio

AV-29VS24/A AV-29VS24/M AV-29VX54/S

Super: S11 ~ S20

Hyper: S21 S41

D/K: 31.5MHz (6.5MHz) D/K: 31.5MHz (6.5MHz)

[NICAM: 32.15MHz (5.85MHz)] I: 32.0MHz (6.0MHz)

I: 32.0MHz (6.0MHz) B/G: 32.5MHz (5.5M)

[NICAM: 31.45MHz (6.55MHz)] M: 33.5MHz (4.5MHz)

B/G: 32.5MHz (5.5MHz)

[A2: 32.26MHz (5.74MHz)]

[NICAM: 32.15MHz (5.85MHz)

M: 33.5MHz (4.5MHz)

A68LZU185X A68QCU770X52K

29-inch, aspect ratio 4:3, flat square face type, tinted

Visible size: 67.6cm (Diagonal) / 54.1cm x 40.6cm (H x V)

C : 0.286V (p-p) (Burst signal), 75

CB/CR : 0.7V(p-p), 75

500mV (rms) (-4dBs), Low inpedance (400Hz when modulated 100%), RCA pin jack x 2

(AA/R06/UM-3 battery x 2) (AA/R06/UM-3 battery x 2)

Ω

Contents

Ω

Design & specifications are subject to change without notice.

1-2 (No. YA103)

SECTION 1

PRECAUTION

1. 1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

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 products 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 products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily 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 (

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) Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( GND, the ISOLATED (NEUTRAL) : ( EARTH : ( side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.

(5) If any repair has been made to the chassis, it is

recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

(6) The high voltage applied to the picture tube must conform

with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.

(7) Do not check high voltage by drawing an arc. Use a high

voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k 2W resistor to the anode button.

) on the parts list in Service manual.

) side

) side GND and

) side GND. Don't short between the LIVE

(8) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.

(9) Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an

appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

Alternative Check Method

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500

Ω 10W resistor paralleled by a 0.15µF AC-type

capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000Ω/V, OR MORE SENSITIVITY)

0.15µF AC-TYPE

PLACE THIS PROBE

1500Ω 10W

Ω

GOOD EARTH GROUND

ON EACH EXPOSED ME TAL PART

(No. YA103) 1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2. 1 FEATURES

• New chassis design enables use of an interactive on-screen control.

• Pure flat CRT produces fine textured picture in every detail.

• Wide range voltage (110V ~ 240V) for AC power input.

• With AUDIO/VIDEO/S-VIDEO/COMPONENT input terminals.

• I

C bus control utilizes single chip ICs.

• By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged

automatically.

• Built-in DIGITAL ECO MODE (ECONOMY, ECOLOGY).

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.

• Built-in OFF TIMER & RETURN +.

2. 2 MAIN DIFFERENCE LIST

 Items AV-29VS24/A AV-29VS24/M AV-29VX54/S

 MAIN PWB ASS’Y SCW-1019A-H2 SCW-1020A-H2 SCW-1015A-H2  FRONT CABINET ASS’Y GG10239-014A-H ← GG10239-010A-H

REMOTE CONTROL UNIT RM-C1281-2H ← RM-C1280-2H

 PICTURE TUBE A68LZU185X ← A68QCU770X52K

QMPG120-170-JC QMPR340-165-K2 QMPR650-165-JC

 POWER CORD

PIP --- --- YES

TELE TEXT FASTEXT ← ---

1-4 (No. YA103)

2.3 FUNCTIONS

REMOTE CONTROL UNIT

RM-C1281-2H [AV-29VS24/A, AV-29VS24/M ]

4 5 6

24 11 12 13 14 15 16 17

SOUND SYSTEM key

COLOUR SYSTEM key

FAVORITE CHANNEL keys

DISPLAY BACK key

MENU (OK) key

TEXT key

SOUND TURBO key

PICTURE MODE key

SOUND setting key (Stereo/Bilingual Ι/Bilingual ΙΙ/Monaural)

OFF TIMER key

RETURN + key

CHANNEL (-/+) keys

MODE key

INDEX key

REVEAL key

Not used

STORE key

ECO key

POWER key

TV / VIDEO key

MENU (/, /) keys

MUTING key

Number keys

-/-- key

VOLUME (-/+) keys

SUBPAGE key

HOLD key

CANCEL key

SIZE key

BASS key

CINEMA SURROUND key

RM-C1280-2H [AV-29VX54/S]

4 5 6

11 12 13 14 15 16 17

26 27 28 29 30 31 32

SOUND SYSTEM key

COLOUR SYSTEM key

FAVORITE CHANNEL keys

DISPLAY BACK key

MENU (OK) key

TEXT keys

SOUND TURBO key

PICTURE MODE key

SOUND setting key (Stereo/Bilingual Ι/Bilingual ΙΙ/Monaural)

OFF TIMER key

RETURN + key

CHANNEL (-/+) keys

MODE key

INDEX key / SUB (+) key

REVEAL key / SUB (-) key

Not used

INPUT / STORE key

ECO key

POWER key

PIP key

TV / VIDEO key

MENU (/, /) keys

MUTING key

Number keys

-/-- key

VOLUME (-/+) keys

SUBPAGE key

POSITION / HOLD key

SWAP / CANCEL key

FREEZE / SIZE key

BASS key

CINEMA SURROUND key

(No. YA103) 1-5

FRONT PANEL CONTROLS

REAR TERMINAL

POWER

11 12

L/MONO

IN (VIDEO-3)

HEADPHONE jack

IN (VIDEO-3) : VIDEO

IN (VIDEO-3) : AUDIO L/MONO

IN (VIDEO-3) : AUDIO R

MENU (OK) button

CHANNEL (-/+) buttons

CHANNEL

6 7

VOLUM E

TV/VIDEO

EXIT

VOLUME (-/+) buttons

TV/VIDEO EXIT buttons

Remote control sensor

ECO sensor

POWER lamp

MAIN POWER button

VIDEO-1 INPUT TERMINAL

S-VIDEO

VIDEO-1

INPUT

OVER

MONO

5 6 10 118

COMPONENT

(VIDEO-2)

INPUT

MONO

OUTPUT

VIDEO

AUDIO L/MONO

AUDIO R

COMPONENT (VIDEO-2) INPUT TERMINAL

Y/VIDEO

AUDIO L/MONO

AUDIO R

OUTPUT TERMINAL

VIDEO

AUDIO L

AUDIO R

Aerial input terminal

1-6 (No. YA103)

IC701 Pin Function List (1/2)

Pin no. Terminal name Port name I/O Remark

1 VssP2 VSSP2 - GND 2 VssC4 VSSC4 - GND 3 V1.8C4 VDDC4 I 1.8V (Digital) 4 V3.3A3 VDDA3(3.3V) I 3.3V 5 VrefP_Sdac VREF_POS_LSL I 3.3V (Positive) 6 VrefN_Sdac VREF_NEG_LSL+HPL - GND 7 VrefP_Sdac VREF_POS_LSR+HPR I 3.3V (Negative) 8 VrefN_Sdac VREF_NEG_HPL+HPR - GND

9 VrefP_Sdac VREF_POS_HPR I 3.3V (Positive) 10 XtalIn XTALIN I Crystal oscillator input (24.576 MHz) 11 XtalOut XTALOUT O Crystal oscillator input (24.576 MHz) 12 VssA1 VSSA1 - GND 13 NECK VGUARD/SWIO I V-guard input/ I/O switch 14 CONT DECDIG I Decoupling digital supply 15 V5P1 VP1 I +5V 16 Ph2 PH2LF - Phase-2 filter 17 Ph1 PH1LF - Phase-1 filter 18 Gnd1 GND1 - GND 19 SecPll SECPLL - SECAM PLL decoupling 20 Dec8G DECBG - Bandgap decoupling 21 EW EWD/AVL O East-West drive output or AVL capacitor 22 VDRB- VDRB O Vertical drive B output 23 VDRA+ VDRA O Vertical drive A output 24 Vif1 VIFIN1 I IF input 1 25 Vif2 VIFIN2 I IF input 2 26 Vsc VSC - Vertical sawtooth capacitor 27 Iref IREF I Reference current input 28 GndIF GNDIF - GND 29 Sif1 SIFIN1/DVBIN1 I SIF input 1 30 Sif2 SIFIN2/DVBIN2 I SIF input 2 31 AGC AGCOUT O Tuner AGC output 32 EHT EHTO I EHT/overvoltage protection input

O Automatic Volume Levelling/ sound IF input / subcarrier

33 Ssif/RefIn/Avl/RefOut

34 L 3 AUDIOIN5L I Audio-L3 input (left signal) 35 R 3 AUDIOIN5R I Audio-R3 input (right signal) 36 L_OUT AUDOUTSL O Audio L output 37 R_OUT AUDOUTSR O Audio R output 38 DecsDem DECSDEM - Decoupling sound demodulator

39 QssO/AmO/AudeEm QSSO/AMOUT/AUDEEM

40 Gnd2 GND2 - GND 41 PllIf PLLIF - IF-PLL loop filter 42 SifAgc SIFAGC/DVBAGC - AGC sound IF 43 IfVo/FmRo/DvbO DVBO/IFVO/FMRO O Not used 44 NC DVBO/FMRO O Not used 45 V8AudioSwitches VCC8V I 8V 46 AgcSsif AGC2SIF - AGC capacitor second sound IF 47 V5P2 VP2 I 5V 48 V_OUT IFVO/SVO/CVBSI O Video output 49 L 1 AUDIOIN4L I Audio-L1 input 50 R 1 AUDIOIN4R I Audio-R1 input 51 V3 CVBS4/Y4 I Video V3 52 C4 C4 I Not used 53 Audio2InL AUDIOIN2L I Not used 54 Audio2InR AUDIOIN2R I Not used 55 V2/Y CVBS2/Y2 I Component Y/Video V2 56 L 2 AUDIOIN3L I Audio L2 input (Left signal) 57 R 2 AUDIOIN3R I Audio R2 input (right signal) 58 Y3/Cvbs CVBS3/Y3 I S-Video Y1 59 C1 C2/C3 I S-Video C1 60 AudioLsL AUDOUTLSL O Audio L output for audio power amplifier 61 AudioLsR AUDOUTLSR O Audio R output for audio power amplifier 62 HP_L AUDOUTHPL O Headphone L 63 HP_R AUDOUTHPR O Headphone R 64 CVBSO/PIP CVBSO/PIP O CVBS / PIP output

AVL/SWO/SSIF/REFO/REFIN

reference output / external reference signal input for I signal mixer for DVB operation

O QSS intercarrier output / AM output / deemphasis / (front-

end audio out)

(No. YA103) 1-7

IC701 Pin Function List (2/2)

Pin no. Terminal name Port name I/O Remark

65 SVM SVM O Scan velocity modulation output

66 FbiSo FBISO/CSY

67 Hout HOUT O Horizontal output 68 VssComb VSScomb - GND 69 V5Comb VDDcomb I 5V 70 Vin/R2/Pr VIN (R/PRIN2/CX) I PIP R input 71 Uin/B2/Pb UIN (B/PBIN2) I PIP B input 72 Yin/G2/Y YIN (G/YIN2/CVBS-YX) I PIP G input 73 Ysync YSYNC I Not used 74 Yout YOUT O Not used 75 Uout/INSSW2 UOUT (INSSW2) O RGB / YPBPR insertion input 76 NC VOUT (SWO1) O Not used 77 INSSW3 INSSW3 I YPBPR insertion input 78 R3/Pr R/PRIN3 I Component PR input (Video-2) 79 G3/Y G/YIN3 I Component Y input (Video-2) 80 B3/Pb B/PBIN3 I Component PB input (Video-2) 81 Gnd3 GND3 - GND 82 V5P3 VP3 I 5V 83 BCL BCLIN I Beam current limiter input 84 BLKIN BLKIN I Black current input 85 Rout RO O R output 86 Gout GO O G output 87 Bout BO O B output 88 V3.3A1 VDDA1 I 3.3V 89 RefAdN VREFAD-NEG - GND 90 V3.3RefAdP VREFAD_POS I 3.3V (Positive) 91 RefAd VREFAD I 3.3/2V 92 GndA GNDA - GND 93 V1.8A VDDA(1.8V) I 1.8V 94 V3.3A2 VDDA2(3.3) I 3.3V 95 VssADC VSSadc - GND 96 V1.8ADC VDDadc(1.8) I 1.8V 97 REMOTE INT0/P0.5 I Remote control input 98 PW_LED P1.0/INT1 I POWER LED control

99 P11/TO P1.1/T0 I POWER LED control 100 V1.8C2 VDDC2 I 1.8V 101 VssC2 VSSC2 - GND 102 COMPONENT-PIP P0.4/12SWS - Not used 103 COMB_SW_NT3.5/OTHER P0.3/12SCLK - Not used 104 VER_PROTECT P0.2/12SDO2 O XRAY PROTECT 105 S_REDUCE P0.1/12SDO1 O Sound control 106 P00/I2SDI1 P0.0/12SDI1/O O Not used 107 POWER P1.3/T1 O SUB POWER control 108 SCL1 P1.6/SCL I I2C BUS CLOCK 109 SDA1 P1.7/SDA I/O I2C BUS•@DATA

110 V3.3P VDDP(3.3V) I 3.3V 111 ROTATION P2.0/TPWM O ROTATION 112 3.58/OTHER P2.1/PWMO O 3.58 detection 113 A_MUTE P2.2/PWM1 O AUDIO MUTE 114 4.5/OTHER P2.3/PWM2 O 4.5 detection 115 PROT P3.0/ADC0 I PROTECT 116 ECO_IN P3.1/ADC1 I ECO INPUT 117 V1.8C1 VDDC1 I 1.8V (Digital) 118 DecV1V8 DECV1V8 I 1.8V

119 KEY_IN P3.2/ADC2 I KEY INPUT 120 VDO_DET P3.3/ADC3 I VDO DET IN 121 VSSC1+P1 VSSC/P - Digital GND 122 P24/PWM3 P24/PWM3 I SV DET IN 123 P25/PWM4 P25/PWM4 O GTVA_RESET 124 V1.8C3 VDDC3 I 1.8V (Digital) 125 VssC3 VSSC3 - GND 126 P12/Int2 P1.2/INT2 I External interrupt 127 SDA0 P1.4/RX I/O I2C BUS DATA (Memory) 128 SCL0 I I2C BUS CLOCK (Memory)

I Flyback input/sandcastle output or composite H/V

timing output

1-8 (No. YA103)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

• Unplug the power cord. (1) Remove the 16 screws [A] 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 CHASSIS (CHASSIS BASE AND

CONTROL BASE)

• Remove the REAR COVER. (1) Slightly raise the both sides of the CHASSIS by hand

and remove the 2 claws [B] under the CHASSIS from the front cabinet as shown in Fig.1.

(2) Withdraw the CHASSIS backward.

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

NOTE:

When conducting a check with power supplied, be sure to confirm that the CRT earth wire is connected to the CRT SOCKET PWB and the MAIN PWB.

3.1.3 REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER. (1) Remove the 4 screws [C] as shown in Fig.1.

(2) When you pull out the AV TERMINAL BOARD in the

direction of arrow [D] as shown in Fig.1, it can be removed.

3.1.4 REMOVING THE CONTROL BASE

• Remove the REAR COVER.

• Remove the CHASSIS.

(1) While pushing down the 2 claws [E] as shown in Fig.

2 and pull out the CONTROL BASE in the direction of arrow [F] as shown in Fig. 2, the control base can be removed. (If necessary, take off the wire, connectors etc.)

3.1 .5 REMOVING THE SPEAKER

• Remove the REAR COVER. (1) Remove the 2 screws [G] as shown in Fig.1.

(2) Withdraw the SPEAKER backward. (3) Follow the same steps when removing the other hand

SPEAKER.

3.1.6 CHECKING THE MAIN PW BOARD

• To check the back side of the MAIN PWB. (1) Pull out the CHASSIS and CONTROL BASE. (Refer to

the procedure described in REMOVING THE CHASSIS)

(2) Put the CHASSIS in upright position with the MAIN

PWB's solderside faced to the right. The FBT must be positioned on top. (Viewed from the rear)

(3) Put the CONTROL PWBs in an appropriate position,

taking care not giving tension to the ribbon cables that connect to the MAIN PWB.

CAUTIONS:

• Use insulating materials, if necessary, to avoid possible electrical contacts between PWBs and expose terminals, etc.

• 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.

3.1.7 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. YA103) 1-9

[FRONT SIDE]

CONTROL BASE

PICTURE TUBE

SPEAKER

FRONT CABINET

FRONT CONTROL PWB (1/2)

(X2)

CONTROL BASE

CHASSIS BASE

SPEAKER

CRT SOCKET PWB

Fig.2

CLAW B (under side)

(X2)

CHASSIS

BASE

FRONT CONTROL PWB (2/2)

CLAW B (under side)

MAIN PWB

Fig.2

FBT

AV TERMINAL BOARD

(×4)

1-10 (No. YA103)

REAR COVER

Fig. 1

(×16)

3.2 REPLACEMENT OF MEMORY IC

3.2.1 MEMORY IC

This TV uses the following memory IC.

Memory IC: IC702 on MAIN PWB

The memory IC memorizes data for correctly operating the video and deflection circuits. When replacing the memory IC, be sure to use the same type IC written with the initial values of data. In other words, use the specific IC listed in “PRINTED WIRING BOARD PARTS LIST”. For its mounting location, refer to “ADJUSTMENT LOCATIONS”.

3.2.2 PROCEDURE FOR REPLACING MEMORY IC

1. Power off

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

2. Replacing the memory IC

Replace the memory IC with new one. Be sure to use the memory IC 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 setting of SYSTEM CONSTANT SET:

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

key on the remote control unit simultaneously. The SERVICE MENU screen will be displayed.(See Fig.1.)

(2) In the SERVICE MENU, press the [DISPLAY] key and

[PICTURE MODE] key simultaneously. Then, the SYSTEM CONSTANT SET screen will be displayed.(See Fig.2.)

(3) Check whether the setting values of the SYSTEM

CONSTANT SET are the same as those indicated in Table1. If the value is different, select the setting item with the MENU [ with the MENU

]/[] key, and set the correct value

[]/[] key.

(4) Press the [DISPLAY] key twice to return to the normal

screen.

5. Receive channel setting

Refer to the OPERATING INSTRUCTIONS and set the receive channels (channels preset).

6. User setting

Check the user setting values in Table 2 and Table 3. If setting value is different, set the correct value. For setting, refer to the OPERATING INSTRUCTIONS.

7. Setting of SERVICE MENU

Verify the setting for each setting item in the SERVICE MENU.(See Table 4.) If readjustment is necessary, perform adjustment referring to “ADJUSTMENTS PROCEDURE”.

NAME OF REMOTE CONTROL KEYS

SERVICE MENU

1. IF

3. AUDIO

5. VSM W/B

7. PLUG & PLAY (OFF)

1-7 : SELECT DISPLAY : EXIT

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

Fig. 1

SYSTEM CONSTANT-1

SYSTEM CONSTANT SET 1

SYSTEM COMB TILT SUPER BASS TEXT LANGUAGE

: SEL  : OPE



SYSTEM CONSTANT-2

SYSTEM CONSTANT SET 2

SOUND BILINGUAL BLUE BACK MUTE COLOUR AUTO ECO SENSOR

: SEL  : OPE



SYSTEM CONSTANT-3

SYSTEM CONSTANT SET 3

SURROUND

: SEL  : OPE



2. V/C

4. DEF

6. S TATUS

: MULTI

DISP : EXIT

YES YES NO SINGLE ERCMI

STEREO NO NO NO YES

YES

NOPICTURE BOOSTER

YESCOMPONENT

NOPIP

YESS INPUT

DISPLAY / BACK

MENU OK

PICTURE MODE

Fig. 2

(No. YA103) 1-11

+ 24 hidden pages

JVC AV-29S24/M, AV-29VS24/A, AV-29VX54/S Service Manual

TABLE OF CONTENTS

SPECIFICATION

1. 1 SAFETY PRECAUTIONS

2. 1 FEATURES

2. 2 MAIN DIFFERENCE LIST

2.3 FUNCTIONS

3.1 DISASSEMBLY PROCEDURE

3.2 REPLACEMENT OF MEMORY IC