JVC HV-34LH21, HV-34LH21/E, HV-34LH51/S, HV-34LH71/G Service Manual

52200200311

SERVICE MANUAL

COLOUR TELEVISION

HV-34LH21, HV-34LH21/E,

HV-34LH51/S, HV-34LH71/G

BASIC CHASSIS

RM-C1351

[HV-34LH21]

RM-C1353

[HV-34LH51]

RM-C1350

[HV-34LH71]

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33

No.52200

2003/11

SPECIFICATION

Contents

Items

Dimensions (W × H × D) 89.8cm × 72.8cm × 57.9cm Mass 68.0kg TV RF System B/G, I, D/K, K1, M Colour System PAL / SECAM / NTSC 3.58 / NTSC 4.43 Stereo System A2 (B/G) / NICAM (B/G, I, D/K) Teletext System Fastext (UK system)

WST(world standard teletext system)

Receiving Frequency

Intermediate Frequency

Colour Sub Carrier Frequency

Aerial Input Terminal 75Ω unbalanced, coaxial Power Input AC 110V~240V , 50/60Hz Power Consumption Avg.150W Picture Tube Visible size : 80.1cm (Diagonal) / 64.1cm × 48.1cm (H × V) High Voltage 32.0kV +1.0kV / -1.5kV (At zero beam current) Speaker 5cm × 12cm Oval type × 2 Audio Power Output 10W + 10W Video / Audio

Input

Component Video

Video / Audio Output

Headphone 3.5mm stereo mini jack × 1 Remote Control Unit RM-C1351

VHF Low

VHF High

UHF

CATV

VIF SIF

PAL

SECAM

NTSC

S-Video

[VIDEO-1]

Video

Audio(L/R)

[VIDEO-3]

Video

Audio(L/R)

46.25MHz ~168.25MHz

175.25MHz ~ 463.25MHz

471.25MHz ~ 863.25MHz Mid : X-Z+2, S1~S10 Super : S11~S20 Hyper : S21~S41

38.0MHz

32.5MHz(5.5MHz) / 32.0MHz(6.0MHz) / 3.15MHz(6.5MHz) / 33.5MHz (4.5MHz)

4.43MHz

4.40625MHz / 4.25MHz

3.58MHz / 4.43MHz

Mini-DIN 4 pin connector × 1 Y : 1V(p-p), Positive (Negative sync provided), 75Ω C : 0.286V(p-p) (burst signal), 75Ω 1V(p-p), negative sync, 75Ω, RCA pin jack × 4 500mV(rms) (-4dBs), High impedance, RCA pin jack × 8 RCA pin jack × 3 Y : 1V(p-p), 75Ω CB : 0.7V(p-p), 75Ω CR : 0.7V(p-p), 75Ω

1V(p-p) 75Ω, RCA pin jack × 1 500mV(rms) (-4dBs), Low impedance, RCA pin jack × 2

(AA/R06/UM-3 battery × 2)

HV-34LH21

HV-34LH21/E

HV-34LH71/G HV-34LH51/S

RM-C1350 (AA/R06/UM-3 battery × 2)

NON

RM-C1353 (AA/R06/UM-3 battery × 2)

Design & specifications are subject to change without notice.

1-2 (No.52200)

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 ( ) on the parts list in 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) 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 : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE 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 B1 POWER SUPPLY check).

(6) The high voltage appli ed to the picture tube must confo rm

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 d rawing 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 gr ound frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button.

(8) When service is required, obse rve 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 Chec k

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.).

Alternate 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 1000Ω per volt or more sensitivity in the following manner. Connect a 1500Ω 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 ac ross 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 1000 /V, OR MORE SENSITIVITY)

0.15 F AC-TYPE

PLACE THIS PROBE

1500 10W

GOOD EARTH GROUND

ON EACH EXPOSED METAL PART

(No.52200)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

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

• The TELETEXT SYSTEM has a built-in FASTEXT (UK system), and WST (world standard teletext system). [Only HV-34LH21, HV-34LH21/E, HV-34LH71/G]

• Pure FLAT CRT reproduce fine textured.

• Digi Pure pro : Auto digi pure with motion picture compensation.

• 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.

2.2 MAIN DIFFERENCE LIST

Item HV-34LH21 HV-34LH21/E HV-34LH51/S HV-34LH71/G

TELETEXT YES YES NO YES PIP NO NO YES YES COLOUR AUTO NO NO YES NO BLUE BACK MUTE NO NO YES NO MAIN PWB ASSY SML-1502A-H2 SML-1507A-H2 SML-1505A-H2 SML-1504A-H2 POWER &DEF PWB ASSY SML-2502A-H2 SML-2504A-H2 SML-2502A-H2 SML-2502A-H2 MICOM /100Hz PWB ASSY SML0Z502A-H2 SML0Z502A-H2 SML0Z501A-H2 SML0Z501A-H2 AV SW PWB ASSY SML0J502A-H2 SML0J502A-H2 SML0J504A-H2 SML0J504A-H2 REMOTE CONTROL UNIT RM-C1351-1H RM-C1351-1H RM-C1353-1H RM-C1350-2H

1-4 (No.52200)

2.3 FUNCTIONS  FRONT TERMINAL & CONTROL

1 2 3 4 5 6 7 8 9

HEADPHONE jack

VIDEO-4 terminal (S-VIDEO / VIDEO / L/MONO / R)

MENU/OK button

CHANNEL -/+ (MENU UP/DOWN) button

VOLUME -/+ (MENU LEFT/RIGHT) button

 REAR TERMINAL

OVER

IN (VIDEO-4)

L/MONO

CHANNEL

VOLUME

TV/VIDEO EXIT

TV / VIDEO / EXIT button

Remote Control sensor

POWER lamp

POWER button

POWER

1 2 3 4

VIDEO-1 (INPUT) terminal

AUDIO

L/MONO

AUDIO

L/MONO

AUDIO

VIDEO

OVER

Y/VIDEOC

VIDEO-1

VIDEO-2

VIDEO-3/

COMPONENT

OUTPUT

(S, VIDEO, L/MONO ,R)

VIDEO-2 (INPUT) terminal ( VIDEO, L/MONO ,R)

VIDEO-3 (INPUT) terminal (Y/VIDEO, C

OUTPUT (VIDEO, AUDIO L/R) terminal

B,CR , L/MONO, R) /COMPONENT

(VIDEO, L, R)

AERIAL socket

(No.52200)1-5

 REMOTE CONTROL UNIT

RM-C1351

[HV-34LH21,HV-34LH21/E]

RM-C1353

[HV-34LH51/S]

1616

RM-C1350

[HV-34LH71/G]

POWER key

ZOOM key

CINEMA SURROUND key

MUTING key

COLOUR SYSTEM key

SOUND SYSTEM key

DISPLAY key

MENU (/&/) keys

MENU / OK key

TV/TEXT key

STEREO / key ޓޓ:Stereo / :Mono :Bilingual (sub ) :Bilingual (sub )

TV / VIDEO key

PICTURE MODE key

RETURN + key

CHANNEL keys

-/-- key

VOLUME +/- keys

CHANNEL +/- keys

FAVORITE CH keys

POWER key

ZOOM key

CINEMA SURROUND key

PIP key

MUTING key

COLOUR SYSTEM key

SOUND SYSTEM key

DISPLAY key

MENU (/&/) keys

MENU / OK key

STEREO / key ޓޓ:Stereo / :Mono :Bilingual (sub ) :Bilingual (sub )

TV / VIDEO key

PICTURE MODE key

SUB-P +/- key

RETURN + key

CHANNEL keys

-/-- key

VOLUME +/- keys

CHANNEL +/- keys

FAVORITE CH keys

POWER key

ZOOM key

CINEMA SURROUND key

PIP key

MUTING key

COLOUR SYSTEM key

SOUND SYSTEM key

DISPLAY key

MENU (/&/) keys

MENU / OK key

TV/TEXT key

STEREO / key ޓޓ:Stereo / :Mono :Bilingual (sub ) :Bilingual (sub )

TV / VIDEO key

PICTURE MODE key

SUB-P +/- key

RETURN + key

CHANNEL keys

-/-- key

VOLUME +/- keys

CHANNEL +/- keys

FAVORITE CH keys

1-6 (No.52200)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

3.1.1 REMOVING THE REAR COVER

(1) Unplug the power cord. (2) Remove the 18 screws [A] as shown in the Fig. 1. (3) Withdraw the REAR COVER toward you.

3.1.2 REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER. (1) Remove the 5 screws [B] as shown in the Fig. 1. (2) Withdraw the AV TERMINAL BOARD toward you.

3.1.3 REMOVING THE CHASSIS

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

remove the 2 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.)

3.1.4 REMOVING THE SPEAKER

• Remove the REAR COVER. (1) Remove the 2 screws [C], and remove the SP HOLDER as

shown in Fig. 1.

NOTE :

When removing the screws [C] of the SP HOLDER, remove the lower side screw first, and then remove the

upper one. (2) Remove the 4screws [D] attaching the SPEAKER. (3) Follow the same steps when removing the other

SPEAKER.

3.1.5 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 that you can easily check

the back side of the PW Board.

3.1.6 CAUTION

• When erecting the CHASSIS, 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 PW board.

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 togeth-

er. Should it be inadvertently removed, be sue to tie the wires with a new cable tie.

(No.52200)1-7

SP HOLDER

FRONT CABINET

SPEAKER

FRONT CONTROL PWB (1/2)

(X2)

CONTROL BASE

(X4)

CRT SOCKET PWB

CLAW

MAIN PWB

SP HOLDER

FRONT CONTROL PWB (2/2)

MICOM / 100Hz PWB

AV SW PWB

(X2)

(X4)

SPEAKER

CLAW

FBT

AV TERMINAL BOARD

POWER & DEF. PWB

(X5)

1-8 (No.52200)

POWER CORD

REAR COVER

(X18)

Fig.1

3.2 REMOVING THE CRT

NOTE:

• Replacement of the CRT should be performed by 2 or more

persons.

• After removing the REAR 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. 3).

(2) While keeping the surface of CRT down, mount the TV set

on the CRT change table balanced will as shown in Fig. 3.

(3) Remove 4 screws marked by arrows with a box type screw-

driver as shown in Fig. 4.

NOTE:

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 ca binet sl owly

on cloth (At this time, be carefully so as not to damage the front surface of the cabinet) shown in Fig. 5.

NOTE:

• 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.

CRT CHANGE TABLE

CLOTH

CRT CHANGE TABLE

Fig.3

CRT

Fig.4

APPROX. 35cm

BOX TYPE SCREW DRIVER

CABINET

Fig.5

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 su re to coat silicon grease for electrical insulation as shown in Fig.6.Wipe around the anode button with clean and dry cloth. (Fig.6)Coat silicon grease on the section around the anode button. At this time, take care so that any silicon greases dose not sticks to the anode button. (Fig.7)

Silicon grease product No. KS - 650N

CRT

Anode button

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

CRT

CRT CHANGE T ABLE

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

Silicon grease

coating

Fig.6

Anode button (No sticking of silicon grease)

Fig.7

Coating position of silicon grease

Anode cap

(No.52200)1-9

3.3 MEMORY IC REPLACEMENT

3.3.1 MEMORY IC

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

3.3.2 PROCEDURE FOR REPLACING MEMORY IC

(1) Power off

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

(2) Replace the memory IC

Be sure to use a memory IC written with the initial da ta values.

(3) Power on

Connect the power plug into the wall outlet and switch the power on.

(4) Check and setting of SYSTEM CONSTANT SET

• It must not adjust without signal. a) Press the [DISPLAY] key and the [PICTURE MODE]

key of the REMOTE CONTROL UNIT simultaneously.

b) The SERVICE MENU screen of Fig. 1 will be

displayed.

c) While the SERVICE MENU is displayed , press the

[DISPLAY] key and [PICTURE MODE] key simultaneously, and the SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

d) 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.

e) Press the [OK] key to memorize the setting value.

f) Press the [DISPLAY] key, and return to the normal

screen.

(5) Receive channels setting

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

(6) User settings

Check the user setting values 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, and reset where necessary. For setting, refer to the SERVICE ADJUSTMENTS.

1. IF

3. AUDIO

5. VSM PRESET

7.PIP

9. SHIPPING(OFF)

1-9 : SELECT DISP : EXIT

1. TEXT

DISPLAY key

PICTURE MODE key

SERVICE MENU

2. V/C

4. DEF

6. STATUS

8. SURROUND

0. BUS FREE

Fig.1

SYSTEM CONTANT SET

2. PIP

3. COLOUR AUTO

4. BLUE BACK MUTE

DISP : EXIT-/+ : STORE

Fig.2

SERVICE MENU

ZOOM (ASPECT) key

MENU key (/ & /)

OK key

Numbers keys

1-10 (No.52200)

[RM-C1350]

Fig.3

3.3.3 FACTORY SETTING VALUES Setting item Setting value Setting item Setting value

MAIN POWER SW OFF SUB POWER SW ON CHANNEL PR1 DISPLAY INDICATED PRESET CHANNEL

Setting item Setting value Setting item Setting value

PICTURE SETTING SOUND

PICTURE MODE BRIGHT BASS Center CONTRAST Center TREBLE Center BRIGHT Center BALANCE Center SHARP Center CINEMA SURROUND OFF COLOUR Center AI VOLUME ON WHITE BALANCE MID INSTALL AI ECO SENSOR DISPLAY OFF LANGUAGE ENGLISH

PICTURE FEATURES EDIT PRESET CHANNEL ONLY DIGITAL VNR AUTO OTHER : NON (SPACE) Digi Pure AUTO AUTO PROGRAM GROUP-1 : HV-34LH21 PULL DOWN AUTO TELETEXT LANGUAGE GROUP-2 : Unused COLOUR SYSTEM TV : Depends on PR/CH

ZOOM REGULAR HV-34LH71/G PICTURE TILT Center GROUP-5 : Unused FAVORITE CH SETTING PRO1 : RED

VIDEO SETTING VIDEO STATAS : VIDEO1

See OPERATING INSTRUCTIONS.

MENU SETTING

EXT : AUTO

PRO2 : GREEN PRO3 : YELLOW PRO4 : BLUE PICTIRE MODE : BRIGHT DIGITAL VNR : AUTO WHITE BALANCE : MID Digi Pure : AUTO PICTURE EFFRCT : OFF

PICTURE MODE : BRIGHT DIGITAL VNR: AUTO WHITE BALANCE : MID Digi Pure : AUTO PICTURE EFFECT : OFF

VOLUME 10

GROUP-3 : HV-34LH21/E GROUP-4 : HV-34LH51/S

FEATURES

SLEEP TIMER OFF BLUE BACK ON CHILD LOCK OFF (for all the channels) CHANNEL GUARD ALL CH : OFF AUTO SHUT OFF OFF VIDEO-3 SETTING COMPONENT PIP / TWIN OFF Only SUB INPUT VIDEO1

HV-34LH51/S HV-34LH71/G

(No.52200)1-11

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