Symphonic Wf2703 St27s3

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diagrama esquematico

Text of Symphonic Wf2703 St27s3

27" COLOR TELEVISION

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na A le vig s A en el ecWF2703

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SERVICE MANUAL

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27" COLOR TELEVISION

ST27S3

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Ref. No.

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A5# S1 S5 S7 X2#

na A le vig s A en el ecDifferent parts from original model (WF2703)Description Part No.----------

RATING LABEL L6604UE CARTON L6604UE SERIAL NO. LABEL L6604UE Not Used OWNER'S MANUAL L6604UE:ENGLISH/SPANISH

0EM408696----------

0EMN02300

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This service manual supplement (ST27S3) contains only the difference from the original model. For all other data, see the original service manual for WF2703.

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SERVICE MANUAL

System Control Block Diagram

BLOCK DIAGRAMS

RCV101 RCV-IN 70 KEY-IN1 66 KEY-IN2 69

REMOTE SENSOR

KEY SWITCH

ct r n+8V

icINPUT0 TO IF/VIDEO BLOCK INPUT0 63 Q481 MONO-OUT STEREO-IN VOLUME A-MUTE-H DG-ON-H +5V-CTRL +5V-CTRL2 +8V-CTRL 71 60 62 64 74 28 18 40 INSEL1 INSEL2 MONO-OUT STEREO-IN VOLUME A-MUTE-H DG-ON-H +5V-CTRL +5V-CTRL2 +8V-CTRL PROTECT-1 PROTECT-2 P-ON-H PROTECT-1 PROTECT-2 PROTECT-3 P-ON-H FROM/TO AUDIO BLOCK FROM/TO POWER SUPPLY BLOCK P-ON-H PROTECT-1 PROTECT-2 PROTECT-3 79 68 67 76 FROM/TO CRT/H.V. BLOCK

IC111 TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION

IC151 (MEMORY) CS 7 SCL 6 SDA 5

72 I2C-OPEN 58 SCL 56 SDA

FROM IF/VIDEO BLOCK

AFT AGC

73 AFT 75 AGC-IN

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MAIN CBA

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6-1

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aL6609BLS

IF/Video Block DiagramRF/IF SIGNALTU1 IF 11

VIDEO SIGNALIC31 20 21

AUDIO SIGNAL

SF1 SAW FILTER

CF31 5 4.5MHz TRAP CF32 3 EQ AMP 1 WF6 AF AMP 11 7

TP301 AGC AGC SCL SDA EXT.CLK 1 4 5 8 WF16 17 RF AGC AFT AMP

LPF IF AGC DET

ct r nVCO F/B Q31 22 16 OSD SW CONTRAST BRIGHTNESS RGB DRIVE /CUT OFF /H.V. BLK 52 51 50 53 46 45 38 37

VCO

ic6-4

VIF AMP

VIDEO DET

aTU-AUDIO TO AUDIO BLOCK INPUT0 AGC AFT FROM/TO SYSTEM CONTROL BLOCK WH301A 5 BLUE 4 GREEN 3 RED TO CRT/H.V. BLOCK WH301B ACL H-DRIVE FBP RAMP-OUT V-RAMP-F/B FROM/TO CRT/H.V. BLOCK

(IF SIGNAL PROCESS)

MAIN CBA

4.5MHz FILTER

8

FM DET

14

IC111 TV MICON/VIDEO /AUDIO/CHROMA /DEFLECTION 58 SCL 56 SDA 32

WF1 26

TUNER

JK701 VIDEO-IN (FRONT) JK704 VIDEO-IN (REAR) WF2

24

LINE

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14 11

ioLPF OSD

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na A le vig s A en el eX301 3.58MHz 16 VCXO LUMINANCE PROCESS CIRCUIT RGB MATRIX /COLOR CONT CHROMINANCE PROCESS CIRCUIT H-SYNC PROCESS CIRCUIT V-SYNC PROCESS CIRCUIT

L6609BLIF

Audio Block DiagramAUDIO SIGNAL MAIN CBAQ411 BUFFER

L-R DEMOD L+R AMP

LPF LPF

VCA

10

11

L-R AMP

MATRIX

21

STEREO SW PILOT DET PHASE COMP2 1

STEREO DRIVER

ct r n20 7

ic14 13

FROM IF/VIDEO BLOCK

TU-AUDIO

5

ATT

5fH TRAP

aSTEREO-IN MONO-OUT

MTS/SAP AUDIO IC401 SIGNAL PROCESS

FROM/TO SYSTEM CONTROL BLOCK

VCO

F/F

F/F

F/F

22

+8V

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Q441

X441

IC481 (INPUT SELECT) FRONT

IC802 (AUDIO AMP)

SP801 SPEAKER L-CH CN801 SP-L 1 SP-GND 2

JK702 AUDIO-IN-(L) (FRONT) JK703 AUDIO-IN-(R) (FRONT) JK704 AUDIO-IN-(L) (REAR) JK704 AUDIO-IN-(R) (REAR)

12 11

TUNER

13

5

(L-CH)

DC VOL.

1 4

(R-CH) FRONT

2

12

SP802 SPEAKER R-CH CN802 SP-R 1 SP-GND 2

TUNER

3

6

SW CTL9 10

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Q825

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A-MUTE-H VOLUME INSEL1 INSEL2

FROM SYSTEM CONTROL BLOCK

6-5

6-6

L6609BLA

CRT/H.V. Block DiagramVIDEO SIGNALIC551 V-DEFLECTION CONTROL THERMAL PROTECTION7

a icQ551, H. Q552 CONTROL Q553 (SWITCHING) VR561 PCC VR562 WIDTH ANODE FOCUS SCREEN WF10 WH501A 3 HEATER 1 +180V WH501B3 15

MAIN CBAWF11 RAMP-OUT Q531 (SWITCHING)

WF12 5 4 WF9 CN571 3 1

DY551 D.Y. VDRIVE HDRIVE

AMP1

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3

WF7 H-DRIVE Q572 H.DRIVE

WF8 T572 Q571 H.OUTPUT

Q532 SWITCHING P-ON-ON

Q561 (SWITCHING)

FROM/TO SYSTEM CONTROL BLOCK

PROTECT-1 PROTECT-2 P-ON-H

X-RAY TP591 TP592

na A le vig s A en el eT571 F.B.T. FOCUS VRHV

FROM POWER SUPPLY BLOCK

DEF+B +B

1

11 F S

5

SCREEN VR

8

10 4 7

ct r nQ1522 GREEN AMP WF5 WF14 Q1532 BLUE AMP

FROM/TO IF/VIDEO BLOCK

V-RAMP-F/B

PULSE UP

TO SYSTEM CONTROL BLOCK

ANODE

PROTECT-3

3

TP302 15kHz FROM/TO IF/VIDEO BLOCK FBP ACL

JK1501 7 4 8 6 11 10 9 CN1501 FOCUS SCREEN GND R G B V501 CRT

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FROM IF/VIDEO BLOCK

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TO WH301A WH301B RED 3 GREEN 4 BLUE 5

WF3

Q1512 RED AMP

WF15

WF4

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TP1501 GND

TP1502 BLUE

WF13

HEATER GND

CRT CBA

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6-8

L6609BLCRT

Power Supply Block DiagramCAUTION ! Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F601) is blown, check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail.HOT CIRCUIT. BE CAREFUL.

4A/125V

HOTT6014A/125V

COLD6 9

ct r nTP601 +BQ671 SWITCHING Q676 SWITCHING CONTROL VR661 +B ADJ

icQ111 +5V SWITCHING Q321 +9V SWITCHING Q831 SWITCHING P-ON-ON Q832 SWITCHING P-ON-ON

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE. ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MME TYPE DE 4A, 125V.

aQ681 +8V SWITCHING Q682 +5V SWITCHING Q683 +5V SWITCHING

NOTE : The voltage for parts in hot circuit is measured using hot GND as a common terminal.

DEF +B PROTECT-2 (TO PIN 67 OF IC111) +B AL+33V BACK-UP P-ON+5V +5V CTRL2 (FROM PIN 18 OF IC111) AL+9V AL+12V

F601 4A/125V AC601 AC CORD CN691 DG691 DEGAUSSING COIL

L601 LINE FILTER

D605 - D608 BRIDGE RECTIFIER

PS691

Q601 SWITCHING

na A le vig s A en el e10 4 11 12

2

14

P-ON+8V +8V CTRL (FROM PIN40 OF IC111) PROTECT-1 (TO PIN68 OF IC111) P-ON+5V +5V CTRL (FROM PIN28 OF IC111) P-ON+5V

Q602 LIMITER

1

13

4

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IC601 ERROR VOLTAGE DET

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2

Q662 FEED BACK

SWITCHING Q833 P-ON+8V

P-ON+12V

RL601

P-ON+8V

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Q675 SWITCHING P-ON-ONQ696 (SWITCHING) DG-ON-H (FROM PIN74 OF IC111)

P-ON-H (FROM PIN79 OF IC111)

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MAIN CBA 6-10 L6609BLP

6-9

Main 1/4 Schematic DiagramVIDEO SIGNAL

A4

B4

C4

D4

nE4

icF4MAIN 1/4 Ref No. ICS C-2 IC111 A-3 IC151 TRANSISTORS Q111 D-1 Q321 E-2 Position

A3

B3

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trE3 F3 A2 B2

A

E2

A1

B1

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E1

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aF2 F17-3 7-4 L6609SCM1

Main 2/4 Schematic DiagramVIDEO SIGNAL AUDIO SIGNAL

nK4

icG4 H4 I4 J4 L4MAIN 2/4 Ref No. ICS H-3 IC401 H-1 IC481 J-4 IC802 TRANSISTORS I-3 Q411 I-4 Q441 K-4 Q481 J-3 Q825 K-2 Q831 K-1 Q832 K-2 Q833 CONNECTORS CN801 K-1 CN802 K-1 Position

G3

le vig s A en el ecI3 J3 I2 J2 I1 J1

trH3 K3 L3 G2

A

H2

K2

G1

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K1

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aL2 L17-5 7-6 L6609SCM2

Main 3/4 Schematic DiagramIF SIGNAL VIDEO SIGNAL AUDIO SIGNALCAUTION ! Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit. If Main Fuse (F601) is blown, check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply. Otherwise it may cause some components in the power supply circuit to fail. NOTE : The voltage for parts in hot circuit is measured using hot GND as a common terminal.CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 4A, 125V FUSE. ATTENTION: UTILISER UN FUSIBLE DE RECHANGE DE MME TYPE DE 4A, 125V.

icM4

a7-8

4A/125V

nQ4

N4

O4

P4

R4

MAIN 3/4 Ref No. ICS

Position

M3

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N3

O3

P3

Q3

R3

P-3 IC31 O-1 IC601 TRANSISTORS P-4 Q31 P-2 Q601 P-1 Q602 N-1 Q641 O-1 Q662 N-2 Q671 N-1 Q675 Q676 N-1 M-1 Q681 M-1 Q682 M-1 Q683 O-2 Q696 CONNECTOR CN691 Q-2 TEST POINT N-4 TP301 VARIABLE RESISTOR VR661 O-1

A

M2

N2

O2

P2

trQ2 R2 M1

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N1

O1

P1

Q1

R1

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L6609SCM3

Main 4/4 & CRT Schematic DiagramMAIN 4/4 Ref No. IC S-3 IC551 TRANSISTORS S-2 Q531 S-2 Q532 Q551 T-3 T-3 Q552 Q553 U-2 U-3 Q561 Q571 U-2 Position Ref No. Position TRANSISTORS T-2 Q572 CONNECTORS T-3 CN571 WH301A V-2 WH501A V-3 TEST POINTS TP300 U-2 V-2 TP302 TP591 U-2 Ref No. Position TEST POINTS U-2 TP592 U-2 TP601 VARIABLE RESISTORS VR561 U-3 VR562 U-3 CRT Ref No. Position TRANSISTORS W-2 Q1512 W-2 Q1