JVC AV-27CF36/R, AV-27CF36/S, AV-27SF36/R, AV-27SF36/S, AV-32CF36/Y Service Manual

SERVICE MANUAL

COLOR TELEVISION

AV-27CF36/R, AV-27CF36/S,

AV-27SF36/S, AV-27SF36/R,

AV-32CF36/Y, AV-32CF36/Z,

AV-32SF36/Y, AV-32SF36/Z

BASIC CHASSIS

GJ5

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

COPYRIGHT © 2005 Victor Company of Japan, Limited

No.YA257

2005/2

SPECIFICATION

					Contents
Items
			AV-27CF36					AV-32CF36
			AV-27SF36					AV-32SF36
Dimensions (W × H × D)		75.8 cm ×	59.3 cm ×		50.0 cm		87.7 cm ×	69.9 cm ×	56.5 cm
		(29-7/8" ×	23-3/8" ×		19-3/4")		(34-5/8" ×	27-5/8" ×	22-1/4")
Mass		43.0 kg (94.6 Ibs)					64.0 kg (140.8 Ibs)
TV RF System		CCIR (M)
Color System		NTSC
Sound System		BTSC (Multi Channel Sound)
Teletext System		Closed Caption (T1 - T4 / CC1 - CC4)
TV Receiving Channels	VHF low	02ch - 06ch: 54 MHz - 88 MHz
and Frequency	VHF high	07ch - 13ch: 174 MHz - 216 MHz
	UHF	14ch - 69ch: 470 MHz - 806 MHz
	CATV	54MHz - 804 MHz
		Low Band: 02 - 06
		High Band: 07 - 13
		Mid Band: 14 - 22
		Super Band: 23 - 36
		Hyper Band: 37 - 64
		Ultra Band: 65 - 94, 100 - 135
		Sub Mid Band: 01, 96 - 99
TV / CATV Total Channel		181 Channels
		[Reception of channel A-5 ("95" of the TV set’s on-screen CABLE channel) is
		recommended for your TV set.]
Intermediate Frequency	Video IF	45.75 MHz
	Sound IF	41.25 MHz (4.5 MHz)
Color Sub Carrier		3.58 MHz
Power Input		AC120 V, 60 Hz
Power Consumption		140 W					160 W
Picture Tube (Visible size)		68 cm (29”) Measured diagonally					80 cm (34”) Measured diagonally
		(H: 55.4 cm × V: 41.8 cm)					(H: 65.6 cm × V: 49.6 cm)
High Voltage		30.0 kV ±1.3 kV [at Zero beam current]					31.4 kV ±1.3 kV [at Zero beam current]
Speaker		5 cm × 12 cm (2" × 4-3/4"), Oval type ×				2
Audio Power Output		5 W + 5 W
Antenna Terminal (VHF / UHF)		F-type connector, 75 Ω unbalanced
Video / Audio input	Component Video	RCA pin jack × 3
[Input-1/2/3]	[Input-2]	Y : 1V(p-p), 75 Ω		, negative sync
		Pb/Pr : 0.7 V(p-p), 75 Ω
	S-video	Mini DIN 4-pin ×		1
	[Input-1]	Y : 1 V(p-p), 75 Ω		, negative sync
		C : 0.286 V(p-p)(burst signal), 75 Ω
	Video	1 V(p-p), 75 Ω , negative sync, RCA pin jack × 2
	Audio	500 mV(rms)(-4dBs), high impedance, RCA pin jack ×						6
Audio Output (Fix)		500 mV(rms)(-4dBs), low Impedance, (400 kHz when modulated 100 %), RCA pin jack × 2
Remote Control Unit		RM-C203G (Lithium cell battery × 1)
Design & specifications are subject to change without notice.

1-2 (No.YA257)

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)Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are connected to one side of the AC power line. An isolation transformer of adequate capacity should be inserted between the product and the AC power supply point while performing any service on some products when the HOT chassis is exposed.

(5)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.

(6)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).

(7)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.

(8)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.

(9)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.

(10)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 1100V 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

(11)High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit shall be checked to operate correctly.See item "How to check the high voltage hold down circuit".

This mark shows a fast operating fuse, the letters indicated below show the rating.

A V

POWER CORD REPLACEMENT WARNING.

Connecting the white line side of power cord to "WHT" character side.

PWB

White line side

PW

WHT

(No.YA257)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1FEATURES

FLAT SQUARE CRT

It became legible from any position by CRT with few reflection and reflect lumps on the flat screen.

DIGITAL COMB FILTER

By the 3 line digital comb filter, the refreshed image can be seen.

VIDEO STATUS

Expression of a favorite screen can be chosen by the VIDEO STATUS function.

COMPONENT INPUT

Since the component signal input terminal is equipped, it reappears direct without deteriorating the signal from DVD.

V-CHIP

Since the V-CHIP is built in, it can choose, view and listen to a healthy program.

2.2MAIN DIFFERENCE LIST

MTS STEREO

The voice multiplex function of the MTS system is built in. (MTS = Multi channel Television Sound system)

RETURN PLUS

You program a specific channel to return to while scanning through the channels using the CH+ and CH - keys.

VIDEO INPUT LABEL

This function is used to label video input connections for the onscreen displays.

WORLD CLOCK

The world clock feature provides time differences for some of the major cities around the world in real time.

Item	AV-27CF36/R	AV-27CF36/S	AV-27SF36/S	AV-27SF36/R
PICTURE TUBE	-	-	-	-
CABINET COLOR	SILVER	←	GRAY	←
Interactive Plug in Menu	NO	←	YES	←
XDS ID Display	NO	←	YES	←

Item	AV-32CF36/Y	AV-32CF36/Z	AV-32SF36/Y	AV-32SF36/Z
PICTURE TUBE	-	-	-	-
CABINET COLOR	SILVER	←	GRAY	←
Interactive Plug in Menu	NO	←	YES	←
XDS ID Display	NO	←	YES	←

2.3HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned is written below. Please distinguish from several contents currently printed on the rating label

			MODEL NAME
			AV-27CF36
			AV-27SF36
MODEL NO.			AV-32CF36
AC 120V 60Hz	W	ME	AV-32SF36
TV SCREEN SIZE : DIAGONAL	INCHES
CHASSIS NO.
MANUFACTURED			DISTINGUISH NAME
SERIAL NO.		VIDEO EQUIPMENT
		4C43
			RA
			SA
			YA
			ZA

1-4 (No.YA257)

2.4TECHNICAL INFORMATION

2.4.1 MAIN MI-COM (CPU) PIN FUNCTION

Pin	Pin name	I/O	Function	Pin	Pin name	I/O	Function
No.				No.
1	MTS_ADJ	I	Not used	29	YC_GND	-	GND
2	AFT1	I	AFT voltage for tuner (Tuning frequency control)	30	V1_IN	I	Not used
3	KEY	I	Key scan for front control [No signal: H]	31	ABCL	I	Current for automatic beam (brightness)/contrast limit
4	uP_DVss	-	GND	32	MONITOR_OUT	O	Not used
5	Reset	I	CPU reset [Reset: L]	33	BLACK_DET	-	Black level detection filter
6	8MHz_OUT	O	CPU system clock: 8MHz oscillation	34	SVM_OUT	O	Y signal for scan velocity scan modulation
7	8MHz_IN	I	CPU system clock: 8MHz oscillation	35	APL_FIL	-	Average picture level filter
8	TEST	-	GND	36	APC_FIL	-	Automatic phase control filter
9	uP_DVDD	I	5V	37	fsc_OUT	O	Color sub carrier (3.58MHz) for 3-line digital comb filter [IC5201]
10	AGC_MUTE	O	AGC muting for tuner (when channel select) [Muting : H]	38	YC_Vcc	I	5V (for video process circuit)
11	uP_VVSS	-	GND	39	R_OUT	O	R signal for CRT output
12	TV_HGND	-	GND	40	G_OUT	O	G signal for CRT output
13	FBP_SCP	I	Flyback pulse (H. pulse)	41	B_OUT	O	B signal for CRT output
14	HOUT	O	H. drive (oscillation)	42	RGB_Vcc	I	9V (for RGB process circuit)
15	H_Vcc	I	9V (for H. oscillation start)	43	IK_IN	I	Not used
16	HAFC_1	-	H. AFC filter	44	TV_DGND	-	GND
17	Vsaw	-	V. saw filter	45	uP_AGND	-	GND
18	VOUT	O	V. drive	46	uP_AVdd	-	5V
19	EW_OUT	O	Parabola waveform (for sidepin correection)	47	MAIN_POWER	O	Power on/off switching control [Powen on: L]
20	X-RAY	I	X-ray detection (for protection) [Detection : H]	48	PANORAMA	I	Not used: Aspect size control [PANORAMA: L]
21	Ys	I	Not used	49	SDA0	I/O	Data for Inter IC control bus (for various devices)
22	Cb_IN	I	Cb (external) signal	50	SCL0	O	Clock for Inter IC control bus (for various devices)
23	Y_IN	I	Y (external) signal	51	SDA1	I/O	Data for Inter IC control bus (for main memory)
24	Cr_IN	I	Cr (external) signal	52	A_MUTING	O	Audio muting [Muting : H]
25	TV_DVcc	I	3.3V	53	SCL1	O	Clock for Inter IC control bus (for main memory)
26	V3IN/CIN	I	Chroma signal (for YC separation output)	54	LED	O	POWER / ON TIMER LED lndication [lighting : L]
27	EHT_IN	I	Not used	55	REMOCON	I	Remote control sensor input [No input : H]
28	V2_IN/Y_IN	I	Y signal (for YC separation output)	56	ASP_ABL	I	Not used

(No.YA257)1-5

SECTION 3

DISASSEMBLY

3.1DISASSEMBLY PROCEDURE

3.1.1REMOVING THE REAR COVER

(1) Disconnect the power plug.

(2) Remove the 12 screws [A].

(3) Withdraw the REAR COVER backward.

3.1.2REMOVING THE AV TERMINAL BOARD

• Remove the REAR COVER.

(1) Remove the 4 screws [B].

(2) Withdraw the AV TERMINAL BOARD toward you.

3.1.3REMOVING THE CHASSIS

•Remove the REAR COVER.

•Remove the AV TERMINAL BOARD.

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

(2)Remove the 2 claws under the both side of the CHASSIS from the front cabinet.

(3)Withdraw the CHASSIS backward.

(If necessary, remove the wire clamp, connectors etc.)

3.1.4 REMOVING THE SPEAKER

• Remove the REAR COVER.

AV-27WF36

(1)Remove the 4 screws [C] and remove the SPEAKER.

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

AV-32WF36

(1)Remove the 2 screws [D], then remove the SPEAKER HOLDER.

(2)Remove the 2 screws [E], then remove the SPEAKER from the SPEAKER HOLDER.

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

NOTE :

When remove the 2 screws [D] of the SPEAKER, remove the lower side screw first, and then takeing out the upper one.

3.1.5 REMOVING THE LED & POWER SW PWB

•Remove the REAR COVER.

(1)Remove the 2 screws [F].

(2)Withdraw the LED & POWER SW PWB toward you. *If necessary, remove the wire clamp, connector etc.

3.1.6REMOVING THE FRONT CONTROL PWB

• Remove the REAR COVER.

(1) Remove the 2 screws [G].

(2) Withdraw the FRONT CONTROL PWB toward you. *If necessary, remove the wire clamp, connector etc.

3.1.7CHECKING THE CHASSIS

To check the PW Board from back side.

(1)Pull out the CHASSIS (refer to REMOVING THE CHASSIS).

(2)Erect the CHASSIS vertically with the HVT side facing up so that you can easily check the back side of the PW board.

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 PWB.

3.1.8 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.YA257)

FRONT CABINET	AV-27CF36
AV-32CF36
AV-32SF36	AV-27SF36
SPEAKER
SPACER

C

E

SPEAKER

D

	CRT	SPEAKER
	SOCKET
		HOLDER
	PWB

FRONT CONTROL PWB

		Claw
		MAIN PWB
		G
LED & POWER SW PWB	F
	Claw	POWER CORD

	REAR COVER	AV SELECTOR PWB	AV TERMINAL
			BOARD

B

A

Fig.1

(No.YA257)1-7

3.1.9 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. 2).

(2)While keeping the surface of CRT down, mount the TV set on the CRT change table balanced will as shown in Fig. 2.

(3)Remove 4 screws marked by arrows with a box type screwdriver as shown in Fig. 3.

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. 4.

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.2

CRT

CRT CHANGE TABLE

BOX

TYPE SCREW DRIVER

Fig.3

CRT

	CABINET	CRT
		CHANGE TABLE

Fig.4

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.5.Wipe around the anode button with clean and dry cloth. (Fig.5)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.6)

Silicon grease product No. KS - 650N

CRT	Anode button

Silicon grease coating

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

Anode button (No sticking of silicon grease)

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

Coating position of silicon grease

Anode cap

Fig.5

Fig.6

1-8 (No.YA257)

3.2MEMORY 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.

2.Replace the memory IC

Be sure to use a memory IC written with the initial setting data.

3.Power on

Connect the power cord to the wall outlet and switch on the power.

4.Receiving channel setting

Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the receive channels (Channels Preset) as described.

5.User settings

Check the user setting items according to the "FACTORY SETTING ITEM" table.

Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.

6.SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is necessary(Fig.1) .

Refer to the SERVICE ADJUSTMENT for setting.

3.2.2 SERVICE MODE SETTING ITEMS

SERVICE MENU

	1.V/C(S)		2. DEF(D)
	3.SOUND(A)		4. OTHERS(F)
	5.3L Y/C(LYC)
	7.LOW LIGHT		8. HIGH LIGHT
	9.VCO
	11.I2C BUS	12. SYSTEM(SYS)
	SELECT BY
	OPERATE BY				EXIT BY		EXIT
			Fig.1
Setting items					Settings		Item No.
1. V/C(S)					Adjust		S01~S48
(Video setting)
2. DEF(D)					Adjust		D01~D33
(Deflection setting)
3. SOUND(A)					Adjust		A01~A08
(Audio setting)
4. OTHERS [Do not adjust]					Fixed		F01~F18
(Factory setting)
5. 3L Y/C(LYC) [Do not adjust]					Fixed		LYC01~LYC12
(Y/C separate setting)
7. LOW LIGHT					Adjust	---
(White balance setting)
8. HIGH LIGHT					Adjust	---
(White balance setting)
9. VCO					Adjust	---
(VCO setting)
11. I2C BUS [Do not adjust]					Fixed	---
(I2C BUS setting)
12.SYSTEM (SYS)					Fixed		SYS01~SYS26
(System constant setting)

(No.YA257)1-9