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

SERVICE MANUAL

COLOUR TELEVISION

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

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

BASIC CHASSIS

ML

RM-C1351 RM-C1353 RM-C1350 [HV-34LH21] [HV-34LH51] [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
					HV-34LH21			HV-34LH71/G			HV-34LH51/S
					HV-34LH21/E
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)							NON
				WST(world standard teletext system)
Receiving		VHF Low		46.25MHz ~168.25MHz
Frequency		VHF High		175.25MHz ~ 463.25MHz
			UHF	471.25MHz ~ 863.25MHz
			CATV	Mid	: X-Z+2, S1~S10
				Super : S11~S20
				Hyper : S21~S41
Intermediate			VIF	38.0MHz
Frequency			SIF	32.5MHz(5.5MHz) / 32.0MHz(6.0MHz) / 3.15MHz(6.5MHz) / 33.5MHz (4.5MHz)
Colour			PAL	4.43MHz
Sub Carrier			SECAM	4.40625MHz / 4.25MHz
Frequency			NTSC	3.58MHz / 4.43MHz
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			S-Video	Mini-DIN 4 pin connector × 1
Input		[VIDEO-1]		Y : 1V(p-p), Positive (Negative sync provided), 75Ω
				C : 0.286V(p-p) (burst signal), 75Ω
			Video	1V(p-p), negative sync, 75Ω			, RCA pin jack × 4
		Audio(L/R)		500mV(rms) (-4dBs), High impedance, RCA pin jack ×					8
	Component Video			RCA pin jack × 3
		[VIDEO-3]		Y	: 1V(p-p), 75Ω
				CB : 0.7V(p-p), 75Ω
				CR : 0.7V(p-p), 75Ω
Video / Audio			Video	1V(p-p) 75Ω , RCA pin jack ×			1
Output		Audio(L/R)		500mV(rms) (-4dBs), Low impedance, RCA pin jack ×					2
Headphone				3.5mm stereo mini jack ×		1
Remote Control Unit				RM-C1351				RM-C1350			RM-C1353
				(AA/R06/UM-3 battery ×		2)		(AA/R06/UM-3 battery ×		2)	(AA/R06/UM-3 battery × 2)

Design & specifications are subject to change without notice.

1-2 (No.52200)

SECTION 1 PRECAUTION

1.1SAFETY 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 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 10kΩ 2W resistor to the anode button.

(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.).

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 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 1000/V,

OR MORE SENSITIVITY)

	0.15 F AC-TYPE
			PLACE THIS PROBE
	1500	10W	ON EACH EXPOSED
			METAL PART

GOOD EARTH GROUND

(No.52200)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1FEATURES

•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.

2.2MAIN 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)

2.3FUNCTIONS

FRONT TERMINAL & CONTROL

	OVER
S	V	L/MONO	R	MENU	CHANNEL	VOLUME	TV/VIDEO
	IN (VIDEO-4)			OK			EXIT
1		2		3	4	5	6

1HEADPHONE jack

2VIDEO-4 terminal (S-VIDEO / VIDEO / L/MONO / R)

3MENU/OK button

4CHANNEL -/+ (MENU UP/DOWN) button

5VOLUME -/+ (MENU LEFT/RIGHT) button

REAR TERMINAL

POWER

7

8

9

6TV / VIDEO / EXIT button

7Remote Control sensor

8POWER lamp

9POWER button

				1	2	3	4
	AUDIO			S
R	L/MONO VIDEO
				OVER
				VIDEO-1
				VIDEO-2
	CR	CB	Y/VIDEO
	AUDIO			VIDEO-3/
R	L/MONO			COMPONENT

OUTPUT

R L

AUDIO VIDEO

5

1VIDEO-1 (INPUT) terminal (S, VIDEO, L/MONO ,R)

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

3VIDEO-3 (INPUT) terminal

(Y/VIDEO, CB,CR , L/MONO, R) /COMPONENT

4OUTPUT (VIDEO, AUDIO L/R) terminal (VIDEO, L, R)

5AERIAL socket

(No.52200)1-5

REMOTE CONTROL UNIT

RM-C1351		RM-C1353		RM-C1350
[HV-34LH21,HV-34LH21/E]		[HV-34LH51/S]		[HV-34LH71/G]

	5	1	5	1	5	1
	6	2	6	2	6	2
	7	3	7	3	7	3
	8		8	4	8	4
	9	10	9	10	9	10
	12	11	12		12	11
	13		13		13
	14	17	14	17	14	17
		18	15	18	15	18
	16		16		16
	20	19	20	19	20	19

21

21

21

1	POWER key			1	POWER key			1	POWER key
2	ZOOM key			2	ZOOM key			2	ZOOM key
3	CINEMA SURROUND key			3	CINEMA SURROUND key			3	CINEMA SURROUND key
5	MUTING key			4	PIP key			4	PIP key
6	COLOUR SYSTEM key			5	MUTING key			5	MUTING key
7	SOUND SYSTEM key			6	COLOUR SYSTEM key			6	COLOUR SYSTEM key
8	DISPLAY key			7	SOUND SYSTEM key			7	SOUND SYSTEM key
9	MENU ( / & / ) keys			8	DISPLAY key			8	DISPLAY key
10	MENU / OK key			9	MENU ( / & / ) keys			9	MENU ( / & / ) keys
11	TV/TEXT key			10	MENU / OK key			10	MENU / OK key
12	STEREO /	key		12	STEREO /	key		11	TV/TEXT key
	:Stereo /	:Mono			:Stereo /	:Mono		12	STEREO /	key
	:Bilingual (sub		)		:Bilingual (sub		)		:Stereo /	:Mono
	:Bilingual (sub		)		:Bilingual (sub		)		:Bilingual (sub		)
13	TV / VIDEO key			13	TV / VIDEO key				:Bilingual (sub		)
14	PICTURE MODE key			14	PICTURE MODE key			13	TV / VIDEO key
16	RETURN + key			15	SUB-P +/- key			14	PICTURE MODE key
17	CHANNEL keys			16	RETURN + key			15	SUB-P +/- key
18	-/-- key			17	CHANNEL keys			16	RETURN + key
19	VOLUME +/- keys			18	-/-- key			17	CHANNEL keys
20	CHANNEL +/- keys			19	VOLUME +/- keys			18	-/-- key
21	FAVORITE CH keys			20	CHANNEL +/- keys			19	VOLUME +/- keys
				21	FAVORITE CH keys			20	CHANNEL +/- keys
								21	FAVORITE CH keys

1-6 (No.52200)

SECTION 3

DISASSEMBLY

3.1DISASSEMBLY PROCEDURE

3.1.1REMOVING 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.

3.1.2REMOVING 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.

3.1.3REMOVING 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.)

3.1.4REMOVING 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 together.

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

(No.52200)1-7

FRONT CABINET

SP HOLDER

		FRONT CONTROL
		PWB (1/2)
		C
		(X2)
		CONTROL
		BASE
	SP HOLDER	D
		(X4)
		SPEAKER

	C
	(X2)
	C
	(X4)
CRT SOCKET	SPEAKER
PWB	FRONT CONTROL
	PWB (2/2)

MICOM / 100Hz

PWB

CLAW

FBT

AV

TERMINAL

BOARD

POWER & DEF.

PWB

CLAW

MAIN PWB

AV SW

PWB

B

(X5)

POWER CORD

REAR COVER

A

(X18)

Fig.1

1-8 (No.52200)

3.2REMOVING 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 screwdriver 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 cabinet slowly 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

APPROX.

35cm

CLOTH

Fig.3

CRT

CRT CHANGE TABLE

BOX

TYPE SCREW DRIVER

Fig.4

CRT

	CABINET	CRT
		CHANGE TABLE

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 sure 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

Silicon grease coating

Fig.6

Approx.

Silicon grease

20mm (Do not

should be coated

coat grease on

by 5mm or more

this section

from the outside

diameter of anode

cap.

	Anode button	Coating position
	(No sticking of
		of silicon grease
	silicon grease)
		Anode cap

Fig.7

(No.52200)1-9

3.3MEMORY IC REPLACEMENT

3.3.1MEMORY 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.

3.3.2PROCEDURE 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 data 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.

SERVICE MENU

1. IF	2. V/C
3. AUDIO	4. DEF
5. VSM PRESET	6. STATUS
7.PIP	8. SURROUND
9. SHIPPING(OFF)	0. BUS FREE
1-9 : SELECT	DISP : EXIT

Fig.1

	SYSTEM CONTANT SET
1. TEXT
-/+	OK : STORE	DISP : EXIT

2. PIP

3. COLOUR AUTO

4. BLUE BACK MUTE

Fig.2

SERVICE MENU

	ZOOM
DISPLAY key	(ASPECT) key
	MENU key
	( / & / )
	OK key
PICTURE MODE	Numbers keys
key

[RM-C1350]

Fig.3

1-10 (No.52200)

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	See OPERATING INSTRUCTIONS.	VOLUME	10

MENU SETTING

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			GROUP-3 : HV-34LH21/E
	EXT : AUTO
				GROUP-4 : HV-34LH51/S
ZOOM	REGULAR				HV-34LH71/G
PICTURE TILT	Center			GROUP-5 : Unused
FAVORITE CH SETTING	PRO1 : RED		FEATURES
	PRO2 : GREEN
		SLEEP TIMER		OFF
	PRO3 : YELLOW
		BLUE BACK		ON
	PRO4 : BLUE
	PICTIRE MODE : BRIGHT	CHILD LOCK		OFF (for all the channels)
	DIGITAL VNR : AUTO
		CHANNEL GUARD		ALL CH : OFF
	WHITE BALANCE : MID
		AUTO SHUT OFF		OFF
	Digi Pure : AUTO
	PICTURE EFFRCT : OFF	VIDEO-3 SETTING		COMPONENT
		PIP / TWIN		OFF		Only
						HV-34LH51/S
VIDEO SETTING	VIDEO STATAS : VIDEO1	SUB INPUT		VIDEO1
						HV-34LH71/G
	PICTURE MODE : BRIGHT
	DIGITAL VNR: AUTO
	WHITE BALANCE : MID
	Digi Pure : AUTO
	PICTURE EFFECT : OFF

(No.52200)1-11