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

ML

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

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

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

S

1 2 3 4 5 6 7 8 9

1

HEADPHONE jack

2

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

3

MENU/OK button

4

CHANNEL -/+ (MENU UP/DOWN) button

5

VOLUME -/+ (MENU LEFT/RIGHT) button

 REAR TERMINAL

OVER

V

IN (VIDEO-4)

L/MONO

R

MENU

OK

CHANNEL

VOLUME

TV/VIDEO
EXIT

6

TV / VIDEO / EXIT button

7

Remote Control sensor

8

POWER lamp

9

POWER button

POWER

1 2 3 4

1

VIDEO-1 (INPUT) terminal

R

R

R

AUDIO

L/MONO

C

R

AUDIO

L/MONO

AUDIO

VIDEO

B

L

VIDEO

S

OVER

Y/VIDEOC

VIDEO-1

VIDEO-2

VIDEO-3/

COMPONENT

OUTPUT

(S, VIDEO, L/MONO ,R)

2

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

3

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

4

OUTPUT (VIDEO, AUDIO L/R) terminal

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

(VIDEO, L, R)

5

AERIAL socket

5

(No.52200)1-5

 REMOTE CONTROL UNIT

RM-C1351

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

5

6

7

8

9

12

13

14

20

10

17

18

19

21

RM-C1353

[HV-34LH51/S]

1

2

3

5

6

7

8

9

12

11

1

2

3

4

10

13

14

15

1616

20

17

18

19

5

6

7

8

9

12

13

14

15

16

20

21

RM-C1350

[HV-34LH71/G]

1

2

3

4

10

11

17

18

19

21

1

POWER key

2

ZOOM key

3

CINEMA SURROUND key

5

MUTING key

6

COLOUR SYSTEM key

7

SOUND SYSTEM key

8

DISPLAY key

9

MENU (/&/) keys

10

MENU / OK key

11

TV/TEXT key

12

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

13

TV / VIDEO key

14

PICTURE MODE key

16

RETURN + key

17

CHANNEL keys

18

-/-- key

19

VOLUME +/- keys

20

CHANNEL +/- keys

21

FAVORITE CH keys

1

POWER key

2

ZOOM key

3

CINEMA SURROUND key

4

PIP key

5

MUTING key

6

COLOUR SYSTEM key

7

SOUND SYSTEM key

8

DISPLAY key

9

MENU (/&/) keys

10

MENU / OK key

12

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

13

TV / VIDEO key

14

PICTURE MODE key

15

SUB-P +/- key

16

RETURN + key

17

CHANNEL keys

18

-/-- key

19

VOLUME +/- keys

20

CHANNEL +/- keys

21

FAVORITE CH keys

1

POWER key

2

ZOOM key

3

CINEMA SURROUND key

4

PIP key

5

MUTING key

6

COLOUR SYSTEM key

7

SOUND SYSTEM key

8

DISPLAY key

9

MENU (/&/) keys

10

MENU / OK key

11

TV/TEXT key

12

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

13

TV / VIDEO key

14

PICTURE MODE key

15

SUB-P +/- key

16

RETURN + key

17

CHANNEL keys

18

-/-- key

19

VOLUME +/- keys

20

CHANNEL +/- keys

21

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)

C

(X2)

CONTROL
BASE

D

(X4)

CRT SOCKET
PWB

CLAW

MAIN PWB

SP HOLDER

FRONT CONTROL
PWB (2/2)

MICOM / 100Hz
PWB

AV SW
PWB

C

(X2)

C

(X4)

SPEAKER

CLAW

FBT

AV
TERMINAL
BOARD

POWER & DEF.
PWB

B

(X5)

1-8 (No.52200)

POWER CORD

REAR COVER

A

(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

OK

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