Hitachi C29TF640S, C29TF650S Service Manual

HITACHI

SERVICE MANUAL

HCPT No.014T-E

MODEL : C29-TF640S C29-TF650S

: " " ""

CAUTION: Before servicing this chassis, it is important that the service technician reads the "Safety Precaution" and " Product Safety Notices" in this Service Manual.

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...…………………………………………………… 7

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…..…………………………………………… 9. …. ……………………………………… 10 - 16

...….…………. …………………… 16 - 21

...………………………………………… 21 - 26...…...…………………………………………… 21 - 38

CONTENTS

SAFETY PRECAUTIONS .…………………………………… 2 PRODUCT SAFETY NOTICE .….…………………………… 2 SPECIFICATIONS .…………………………………………… 6 REMOTE CONTROL UNIT…………………………………… 6 CONTROLS …………..……………………………………… 7 GENERAL OPERATIONS GUIDE ..………………………… 8 BLOCK DIAGRAM ……………………………………………9 CIRCUIT DESCRIPTION . …………………………………… 10 - 16 ADJUSTMENT INSTRUCTIONS ...………………………… 16 - 21 TROUBLESHOOTING .….…………………………………… 21 - 26 REPLACEMENT PARTS LIST ...…………………………… 27 - 38

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

COLOR TELEVISION

March 2004 Hitachi Consumer Products (Thailand) Ltd.

TECHNICAL CAUTIONS

SAFETY PRECAUTIONS

WARNING: Since the chassis of this		receiver	is connected
to one	side of the mains Supply during operation. service
should	not be attempted by anyone	unfamiliar	with the

precautions necessary when working on this type of equipment. The following precautions should be opserved.

1.Do not install , remove, or handel the picture tube in any manner unless shatter-proof goggles are worn. People not so equipped should be kept away while picture tubes are handled. Keep picture tube away from the body while handing.

2.When replacing chassis in the cabinet. All the protective

devices are put back in place , such as ; barriers , nonmetallic knobs , adjustment and compartment cover or shields, isolation resistorscapacitors, etc.

3.When service is required, observe the original lead dress. Extra care should be taken to assure correct lead dress in the high voltage circuitry area.

4.Always use the manufacturer ' s replacement component. Especially critical components as indicated on the circuit diagram should not be replaced by other maker.

Furthermore where a short circuit has occurred, replace those components that indicate evidevce of overheating.

5.Before returning a serviced receiver to the customer, the service technician must thoroughtly test the unit to be

certain that it is completely safe to						operate without danger
of electrical		shock,	and	be	sure	that no	protetive device
built into the instrucment by the manufacturer has became
defactive,	or	inadvertenly		defeated during servicing.
therefore, the following checks are recommended for the
continued	protection		of	the	customers		and service
techninians.

INSULATION

Insulation	resistance	between			the main poles and	a ny
accessible	metal parts		should		not be less than 7MΩ at 500V
CD. Also,	no flashover		or	breakdown should occur		during the
dielectric	strength	test,		to	apply 4KV AC for one minute
between the mains		poles		and	any accessible metal	parts.

X-RADIATION

TUBES : The primary source of					X radiation in		this receiver
is the picture tube.		The		tube	utilized in	this	chassis is
specially constructed		to	limit X radiation.
Fof continued	X radiation		protection, the replacement tube must
be the same	type as	the		original,	HITACHI	approved type.

High	Voltage
This	receiver is	provided with a	hold down	circuit	for
clearly indicating		that voltage has	increased in	excess	of

a predetermined value. Comply with all notes described in this Service Manual regarding this hold down circuit when servicing, so that this hold down circuit is operated correctly.

Serviceman Warning

With minimum Black Level and Picture. The operating high voltage in this receiver is lower than 33.0kV. In case any componant having influence on the high voltage is replaced. confirm that high voltage with minimum Brightness and contrast is lower than 35.0kV. To measure H.V. use a high impedance. H.V.meter. Connect (-) to chassis earth and (+) to the CRT anode button. (See the following connection diagram.

NOTE : Turn the power seitch off without fail before the connection to the Anode button is made

( + )

CRT ANODE

( - )

HIGH IMPEDANCE

H.V. METER

CHASSIS GROUND

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in HITACHI television receiver have special safety related characteristics. These characteristics are often not evident from visual inpection

nor can be protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristecs are identified in this Service Manual. Electrical components having such features are identfied by marking with

a mark in the schematics and on the replacement parts list in this Service Manual. The use of a substitute replacement component which does not have the same safety characteristics as the HITACHI recommended replacement one shown in the parts list in this Service Manual, may create electrical shock, fire, X radiation, or other hazards. Product Safety is continuously under review and new instructions are issued from time to time. For the

latest information, always consult the current HITACHI Service Manual. A subscription to, or additional copies of , HITACHI Service Manual may be obtained at a nominal charge from your HITACHI sales offices.

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TECHNICAL CAUTIONS

High voltage Iimiter circuit operation check

1.Connect the high voltage voltmeter between the CPT anode (anode cap) and GND (CPT grounding lead).

2.Receive the broadcast signal and set the brightness and contrast VRs to max. Set the beam current to 1.6mA + 10%.

(After cut-off adjustment)

3.Set the AC input voltage to 220 + 3V.

4.Check that the constant high voltage is 30.0 + 1.0kV at

this time.

5.Turn the switch of the set to off and connect the jig shown in Fig.3 at R952, R953 as shown in Fig 1.

6.With the brightness and contrast VRs left as set in item. 2 and with the AC input voltage stabilized at 220 V. turn the picture disapears with a high voltage of 34.0 or less.

7.Turn the switch of the set to off immediately after the check is completed.

8.Remove the adjust jigs and high voltmeter.

NOTE : When connecting disconnecting the high voltage voltmeter to from the anode cap, be sure to turn the switch of the set off and do it after the residual high voltage is discharged to the chassis because the high voltage may remain at the anode cap.

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:220

1.,

2.Knob( )

3. มาตรฐานกําหนดทุกชิ้นสวน

				-

5. ลําดับดังนี้

7 500Break Down4 kV DC 1

HOLD DOWN

33.0

Brightness Contrast35H.V. meter CRT anode ( )

: ANODE

( + )

CRT ANODE ( - )

HIGH IMPEDANCE

H.V. METER

VOLTAGE

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1.

HIGH VOLTAGE VOLTMETER

6. 2 (BRIGHTNESS + CONTRASS = MAX) 220 VAC

ANODE CAP

H.V.

34.5

2.

BRIGHTNESS

CONTRAST BEAM CURRENT 1.6

7. POWER SWITCH

+ 10%

3.

220 + 3

8. ADJUST JIGS HIGH VOLTAGE VOLTMETER

4.

29.5 + 10%

:

HIGH VOLTAGE VOLTMETER

5.

JIG 3 R952, R953

ANODE CAP POWER SWITHC

1

DISCHARGE

1

			3
	2

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SPECIFICATION ( )

	625-LINES	B.G/D.K/H PAL
		B.G/D.K/K1 SECAM
Recepstemtion system	525-LINES	NTSC50
		M/NTSC
		NTSC3.58-5.5/6.0/6.5
		NTSC4.43-5.5/6.0/6.5
		PAL 60, SECAM 60
	CCIR	: E2~12, E21~69, S01~3,
		S1~41
	Australia	: AU0~12, AU28~69
Channel coverage	OIRT	: R1~12, R21~69
(Frequencey44MHz-863MHzrange )	JAPAN	: J1~12, J13~69
	U.S.A	: US2~13, J~W, US14~69
	Hong Kong, U.K. : UK21~69
	China	: C1~12, C13~57, Z1~38

* Soecifcations are subject to change wihout notice to improve performance.

Antenna input		75W COAXIAL IEC TYPE
Color picture tube		A68QCU770X56L
Speaker (cm)		6X12 (X2)
Sound output		7W X 2		: AC 240V 50Hz
		751
		191A		: AC 127V 50Hz/60Hz
Power supply		071, 98*, 192	}	: AC 110V - 240V 50Hz/60Hz
		121, 195
		941, 08*, 051	}	: AC 200V - 240V 50Hz/60Hz
		433 , 435
Power consumption		138 W
Weight (kg)		45.5 KG
Dimensions		768 X 593 X 503 (C29-TF640S)
W x H x D (mm)		769 X 593 X 491 (C29-TF650S)

REMOTE CONTROL UNIT ( )

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

POWER ON/OFFSEITCH

/

RECALL

PROGRAMME UP/DOWN

/

INPUT SELECTION

PROGRAMME SELECTOR

CH I/CH II

2

SURROUND

SOUND (Sub - - for T/TEXT)

( Sub - -) PICTUR (U.N.L. - - for T/TEXT)

( U.N.L. - -) MUTE

VOLUME UP/DOWN

/

CURSOR

MENU

Timer (Hold - - for T/TEXT)

( Hold - -) TELETEXT OPERATING KEYS (081/982only)

( 081/982 )

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CONTROL ( )

1

7

2
		8

9

5

4

6

Rear Panel ( )

1	POWER NO/OFF SWITCH
	/
2	STANDBY/TIMER INDICATION
					/
3	AERIAL TERMINAL
4	FUNCTION
5	REMOTE CONTROL RECEIVER
6	AV IN/OUT TERMINAL
		AV /
7	INPUT SELECT
8	VOLUME UP/DOWN
	/
9	PROGRAMME UP/DOWN
			/

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GENERAL ORERATIONS GUIDE ( )

With this TV set, all adjustments/settings are performed by						selecting from	menu screens.
Different menu screens and details					of adjustments/settings	are shown below. To access the menu		screen, press
the				button, then select the	item by pressing the up/down cursor		buttons and setting it by	pressing the left/
		MENU
right		cursor		buttons.

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3

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CIRCUIT DESCRIPTION ( )

Selection and CPU circuitry

IC type, TDA9384/86/65, performs functions like IIC controls, channel selection, on-screen displays, search tuning, systems selection amongst others. The pin's functions of TDA9384/86/65 are oresebted in the table shown bellow.

IC	TDA9384/86/65	IIC IC							,
, , ,								IC
TDA9384/86/65
Pin	Signal		I/O	Configuration			Function
number	name
1	Power		Output	P.P	3.3V	O = Stand - by, 1 = on
2	SCL		I/O	O.D	5V	Colck of main I2 C-bus
3	SDA		I/O	O.D	5V	Data of main I2 C-bus
4	Alarm		Output	O.D	5V	PWM output for Beep sound
5	SAW Sw		Output	O.D	3.3V	1 = M, 0 = Others
6	AV S-DET		Input	H.I.	5V	Detect for S-VHS (not mono chassis)
	SW FE/AV		Output	O.D	5V	FE/AV switch (mono chassis)
7	Key-In		Input	H.I.	3.3V	Local analogue keyboard
8	V2 / V1		Output	O.D	3.3V	1=Video:2, 0=Video:1
9	VSSC / P		-	-		Digital ground for u-controller core and periphery
10	Led		Output	O.D	3.3V	LED Drive
11	ON/OFF Mute		Output	O.D	3.3V	1=Mute on, 0=Mute off (Under Standby)
12	VSSA		-	-		Analog ground of Teletext decoder and digital ground
						of TV-processor
13	SECPLL		-	-		SECAM PLL decoupling
14	VP2		-	-		2nd supply voltage TV-processor (+8V )
15	DECDIG		-	-		Decoupling digital supply of TV-processor
16	PH2LF		-	-		Phase2-filter
17	PH1LF		-	-		Phase1-filter
18	TV		-	-		Ground 3 of TV-processor
19	DECBG		-	-		Bandgap decoupling
20	AVL / EWD		Output	-		East-West drive output
21	VDRB		Output	-		Vertical drive B output
22	VDRA		Output	-		Vertical drive A output
23	IFIN 1		Input	-		IF input 1
24	IFIN 2		Input	-		IF input 2
25	IREF		Input	-		Reference current input
26	VSC		-	-		Vertical sawtooth capacitor
27	AGCOUT		Output	-		Tuner AGC output
28	AUDEEM		Output	-		Audio deemphasis
29	DECSDEM		-	-		Decoupling sound demodulator

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Pin	Signal		I/O			Configuration		Function
number	name
30	GND2		-			-		Gound 2 for TV processor
31	SNDPLL		-			-		Narrow band PLL filter
32	REFO		Output			-		Subcarrier reference output
33	HOUT		Output			-		Horizontal output
34	FBISO		Input			-		Flyback input
35	AUDEXT		Input			-		External audio input
36	EHTO		Input			-		EHT/overvoltage protection input
37	PLLIF		-			-		IF-PLL loop filter
38	IFOut		Output			-		IF-video output / selected CVBS output
39	+8v		-			-		Main supply voltage TV-processor ( +8V )
40	CVBSINT		Input			-		Internal CVBS input
41	GND1		-			-		Ground 1 for TV-processor
42	CVBS/Yin		Input			-		External CVBS input
43	Cin		Input			-		Chrominance input ( SVHS )
44	AUDOUT		Output			-		Audio output
45	INSSW2		-			-		No connection
46	R2/VIN		-			-		No connection
47	G2/YIN		-			-		No connection
48	B2/UIN		-			-		No connection
49	BCLIN		Input			-		Beam current limiter input/V-guard input
50	BLKIN		Input			-		Black current input
51	RO		Output			-		Red OSD output
52	GO		Output			-		Green OSD output
53	BO		Output			-		Blue OSD output
54	VDDA		-			-		Analog supply of Teletext decoder and digital supply
								of TV-processor (3.3V)
55	VPE		-			-		OTP Programming Voltage
56	VDDC		-			-		Digital supply to core (3.3V)
57	OSDGND		-			-		Oscillator ground supply
58	XTA/IN		Input			-		Crystal oscillator input
59	XTA/OUT		Output			-		Crystal oscillator output
60	RESET		Input			-		Reset
61	VDDP		-			-		Digital supply to periphery (+3.3 V)
62	SCL(EEP)		I/O			O.D	3.3V	Clock of secondary I2-bus for EEPROM
63	SDA(EEP)		I/O			O.D	3.3V	Data of secondary I2-bus for EEPROM
64	RC-In		Input			O.D	3.3V	Input for Remote control decoding
Note 1:	Abbreviation of configuration mode:						O.D.	Open Drain
	( comfiguration mode:)						Q.B.	Quasi-Bidirectional
							H.I.	High-Impedance
							P.P	Push-Pull
Note 2:	During reset all pins are in Quasi-Bidirectional mode.
	(				Quasi Bidirectional)

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POWER SUPPLY CIRCUIT

1. Stand-dy mode :

Commutating voltage from AC input is rectified by D931~D934 and produces approximately 300V. This high voltage DC is applied to the primary winding of T931 in series with the integrated high voltage MOSFET inside the I931 (TNY254). The diode D935, capacitor C936, and resistor R930 comprise the clamp circuit that limits the turn-off voltage spike on the drain pin 5 of I931 to a safe value. The secondary winding of T931 is rectified and filtered by D971, C971, L971, and C973 to provide the 5V output. Additional filtering are provided by L972 and C972. The output voltage is determined dy the sum of the opto-coupling I932 forward drop (about 1V) and zener diode D972 voltage.

1. :

D931~D934 300VT931 MOSFET I931(TNY254) D935 , C936 , R930 turn-off voltage spike drain 5 I931T931 D971 , C971 , L971 , C9735 V opto-coupling I932 ( 1 V)D972

2. Turn-on mode :

When TV set turn-on, the on/off signal from MICON become high, so RL901 turns on, commutating voltage from AC input is rectified by D901A and produces approximately 300V to pin 3 of I901. Current flowing through R903, R904, R918, R919 causes I901 pin 4 to initially turn on. Secondary voltage are then induced winding B1-B2 in T901, I901 supply voltage is obtained via R910, D906, C909, C909A and applied to pin 4 of I901, thereby maintaining I902 switching operation. Secondary voltage in S1 - S4 winding is rectified by D952 to produce 24V which is smoothed by C956.

Error amplifier Q951 is set to a pre-determined level by resistor network R950~R953, and reference voltage D953. Should the +B voltage rise, base voltage of transistor Q951 will become more positive, and this difference is amplified by the error amplified by Q951. An output is applied to I901 feedback pin 1 through opto-coupling I902 and controls ON time of I901 internal circuit. In this way, +B voltage is regulated and maintained at a constant level. D959 and D957 offer protection that it should the voltage level rise excessively When standby mode is selected, RL901 turn off. Only+5V still live

2. :

/ MICON HIGH RL901D901A 300V 3 I901 R903 , R904 , R918 , R919 4 I901

B1-B2 T901 R910 , D906 , C909 , C909A 4I901 I902 Switching S1-S2 D961+B 130V C956 S2-S4 D952 24VC956

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