Symphonic WFT20M4 Service Manual Download Page 34 | Manualshive

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WAVEFORMS

L2403WF

8-1

1DIV: 0.5V 20

µ

s

IC 111 Pin 26

WF1

GND

1DIV: 0.5V 20

µ

s

IC 111 Pin 14

WF2

1DIV: 2V 20

µ

s

Q1511 Base

WF3

GND

1DIV: 2V 20

µ

s

Q 1521 Base

WF4

GND

Input:

NTSC Color Bar Signal (with 1kHz Audio Signal)

INITIAL POSITION:

Unplug unit from AC outlet for at least 5 minutes.

reconnect to AC outlet and then turn power on.

(Brightness---Center Color---Center Tint --- Center Contrast---Approx 70%)

1DIV: 0.2V 20ms
IC 31 Pin 9

WF6

1DIV: 2V 20

µ

s

Q 1531 Base

WF5

GND

1DIV: 10V 20

µ

s

Q 572 Collector

WF7

GND

1DIV: 5V 20

µ

s

Q 571 Base

WF8

WF1 ~ WF16 =

Waveforms to be observed at

Waveform

check

points.

(Shown in Schematic Diagram.)

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Summary of Contents for WFT20M4

Page 1: ...20 COLOR TELEVISION WFT20M4 SERVICE MANUAL ...

Page 2: ...e and advice the service trade of all con ceivable ways in which service might be done or of the possible hazardous consequences of each way Consequently Funai has not undertaken any such broad evaluation Accordingly a servicer who uses a service proce dure or tool which is not recommended by Funai must first use all precau tions thoroughly so that neither his safety nor the safe operation of the ...

Page 3: ...et limit specifications Description Condition Unit Nominal Limit 1 Intermediate Freq Picture Sound MHz MHz 45 75 41 25 2 Peak Picture Sens VHF CATV UHF dBµv dBµv dBµv 15 15 15 30 30 40 3 AFT Pull In Range 10mV input MHz 2 0 0 7 Description Condition Unit Nominal Limit 1 Deflection Freq Horizontal Vertical KHz Hz 15 734 60 2 Linearity Horizontal Vertical 15 10 3 Over Scan 10 4 High Voltage KV 29 De...

Page 4: ...ngs tied together and touch the other ohmme ter lead in turn to each tuner antenna input ex posed terminal screw and if applicable to the coaxial connector If the measured resistance is less than 1 0 megohm or greater than 5 2 mego hm an abnormality exists that must be corrected before the instrument is returned to the customer Repeat this test with the instrument AC switch in the off position d L...

Page 5: ...the ground side of the AC power source To confirm that the AC power plug is inserted correctly with an AC volt meter measure between the chassis and a known earth ground If a voltage reading in excess of 1 0V is obtained remove and reinsert the AC power plug in the opposite polarity and again measure the voltage potential between the chassis and a known earth ground b Some TV receiver chassis norm...

Page 6: ...replaced wires do not contact sharp edged or pointed parts H When a power cord has been replaced check that 5 6 kg of force in any direction will not loosen it I Also check areas surrounding repaired locations J Use care that foreign objects screws solder drop lets etc do not remain inside the set K Crimp type wire connector The power transformer uses crimp type connec tors which connect the power...

Page 7: ...exposed accessible parts RF terminals antenna terminals video and audio input and output terminals microphone jacks earphone jacks etc is lower than or equal to the specified value in the table below Measuring Method Power ON Insert load Z between B earth ground power cord plug prongs and exposed accessible parts Use an AC voltmeter to measure across both terminals of load Z See Fig 2 and followin...

Page 8: ...the Flat Pack IC about 5 to 6 seconds Fig S 1 1 2 Remove the flat pack IC with tweezers while ap plying the hot air 3 Bottom of the flat pack IC is fixed with glue to the CBA when removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Release the flat pack IC from the CBA using twee zers Fig S 1 6 Caution 1 The ...

Page 9: ...removing entire flat pack IC first apply soldering iron to center of the flat pack IC and heat up Then remove glue will be melted Fig S 1 6 4 Release the flat pack IC from the CBA using twee zers Fig S 1 6 With Iron Wire 1 Using desoldering braid remove the solder from all pins of the flat pack IC When you use solder flux which is applied to all pins of the flat pack IC you can remove it easily Fi...

Page 10: ...stallation 1 Using desoldering braid remove the solder from the foil of each pin of the flat pack IC on the CBA so you can install a replacement flat pack IC more easily 2 The I mark on the flat pack IC indicates pin 1 See Fig S 1 7 Be sure this mark matches the 1 on the PCB when positioning for installation Then pre solder the four corners of the flat pack IC See Fig S 1 8 3 Solder all pins of th...

Page 11: ...d to remove any static electricity that may be charged on the body 2 Ground for Workbench Be sure to place a conductive sheet or copper plate with proper grounding 1MΩ on the workbench or other surface where the semiconductors are to be placed Because the static electricity charge on cloth ing will not escape through the body grounding band be careful to avoid contacting semiconductors with your c...

Page 12: ... be removed unhooked un locked released unplugged unclamped or des oldered S Screw P Spring L Locking Tab CN Con nector Unhook Unlock Release Unplug or Desolder 2 S 2 two Screws S 2 5 Refer to the following Reference Notes in the Table Reference Notes in the Table 1 Removal of the Rear Cabinet Remove screws 7 S 1 and S 3 then slide the Rear Cabinet back ward 2 Removal of the CRT CBA Disconnect CN1...

Page 13: ...4 2 L2403DC Fig 1 S 1 S 1 S 1 S 1 S 3 1 Rear Cabinet Fig 2 S 1 S 1 S 1 S 1 S 3 S 1 1 Rear Cabinet Fig 3 3 Main CBA Fig 4 2 CRT CBA 4 CRT Anode Cap S 2 S 2 S 2 S 2 ...

Page 14: ...V Cable Wiring Diagram ANODE Fig 5 FLYBACK TRANSFORMER T571 AC601 AC CORD CN801 CLN801 SP801 CN691 MAIN CBA DG691 DEGAUSSING COIL TU11 TUNER WH301A WH501A CN571 JK1501 WH501B WH301B TO CRT GROUND CN1501 FOCUS SCREEN ...

Page 15: ...re normal remote control unit Part No NE154UD NE142UD N0132UD N0108UD NE116UD NE153UD NE141UD or NE122UD Remove 3 Screws from the back lid Fig 1 1 2 Added J1 Jumper Wire to the remote control CBA Fig 1 2 How to set up the service mode Service mode 1 Use the service remote control unit 2 Turn the power on Use main power on the TV unit 3 Press SLEEP button on the service remote con trol unit Version...

Page 16: ... remote control unit Display changes BRT CNT CLR TNT V TNT and SHARP cyclically when MENU button is pressed CNT 1 Press MENU button on the service remote control unit Then select CONTRAST CNT display 2 Press CH o p buttons on the service remote control unit so that the value of CONTRAS CNT becomes 84 CLR 1 Press MENU button on the service remote con trol unit Then select COLOR CLR display 2 Press ...

Page 17: ... S2 is indicated 5 Press CH o p buttons on the service remote control unit so that display will change 0 and 1 Then choose B S2 0 6 Turn the power off and on again using the main power button on the TV unit 6 Purity Check 1 Enter the Service mode See page 5 1 2 Press 7 button on the remote control unit Each time pressing 7 button on the remote control unit display changes Red mode Green mode Blue ...

Page 18: ... o p buttons on the service remote control unit so that the monoscope pattern will be 90 5 of display size and the circle is round 6 Turn the power off and on again Main power but ton on the TV unit 10 V Position Adjustment Purpose To obtain correct vertical width of screen image Symptom of misadjustment If V Position is incor rect vertical height of image on the screen may not be properly display...

Page 19: ...s correctly for pure white Symptom of Misadjustment White becomes bluish or reddish Note Use service remote control unit 1 Operate the unit more than 20 minutes 2 Face the unit to east Degauss the CRT using De gaussing Coil 3 Input the White Raster APL 100 4 Set the color analyzer to the CHROMA mode and after zero point calibration bring the optical recep tor to the center on the tube surface CRT ...

Page 20: ...ture The following adjustments normally are not attempted in the field Only when replacing the CRT then adjust as a preparation 16 Purity Adjustment Purpose To obtain pure color Symptom of Misadjustment If Color Purity Adjust ment is incorrect large areas of color may not be properly displayed 1 Set the unit facing east 2 Operate the unit for over 30 minutes before adjust ing 3 Fully degauss the u...

Page 21: ... P Magnet See Fig 8 3 Paintlock the C P Magnets after adjustment 4 Remove the DY Wedges and slightly tilt the De flection Yoke horizontally and vertically to obtain the best overall convergence 5 Fix the Deflection Yoke by carefully inserting the DY Wedges between CRT and Deflection Yoke Test Point Adj Point Mode Input C P Magnet RB C P Magnet RB G Deflection Yoke Dot Pattern or Crosshatch Tape M ...

Page 22: ...IVE FBP IN RAMP OUT V RAMP F B TO AUDIO POWER CONTROL BLOCK TO POWER SUPPLY BLOCK TO CRT H V BLOCK PROTECT 2 PROTECT 1 PROTECT 3 P ON H KEY IN2 KEY IN1 RCV IN RCV101 JK701 VIDEO IN 24 X301 3 58MHz SAW FILTER VIF AMP VIDEO DET VCO 4 5MHz FILTER LPF IF AGC DET EQ AMP RF AGC AMP AFT 4 5MHz TRAP FM DET AF AMP 16 11 13 18 6 17 4 2 7 1 9 TU11 SF11 IF AGC SDA SCL EXT CLK 1 11 5 4 8 IC151 MEMORY SCL 6 SDA...

Page 23: ...IN TU AUDIO AL 9V ATT 34 57 POWER MANAGE MCU RESET JK702 5V CTRL2 28 5V CTRL 8V CTRL TO POWER SUPPLY BLOCK SP801 SPEAKER CN801 CLN801 1 2 MUTE STANDBY 6 TO IF VIDEO SYSTEM CONTROL BLOCK A MUTE RESET SPEAKER 1 SP GND 2 TV MICON VIDEO AUDIO CHROMA DEFLECTION FRONT AMP AUDIO AMP Audio Power Control Block Diagram ...

Page 24: ...501B WH501A VIDEO SIGNAL CN571 H OUTPUT H DRIVE B X RAY TP591 TP592 PROTECT 3 DEF B AMP 7 1 6 3 PULSE UP THERMAL PROTECTION 5 WF7 WF8 WF11 WF12 WF9 WF10 WF3 WF15 WF4 WF14 WF5 WF13 RED AMP PROTECT 2 RED 3 GREEN 4 BLUE 5 HEATER 3 3 200V 1 1 PROTECT 1 TO POWER SUPPLY BLOCK T571 F B T FOCUS VR SCREEN VR 4 3 1 5 S F HV 11 8 10 7 9 6 Q1511 Q1521 Q1531 PROTECT 4 TO IF VIDEO SYSTEM CONTROL BLOCK TO IF VID...

Page 25: ... PIN 67 OF IC111 BACK UP PROTECT 1 TO PIN68 OF IC111 Q682 P ON 5V 5V CTRL TO PIN28 OF IC111 5V SWITCHING 5V SWITCHING AL 9V Q321 9V SWITCHING Q674 SWITCHING P ON ON P ON H TO PIN79 OF IC111 HOT CIRCUIT BE CAREFUL FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE 4 A 125V FUSE CAUTION ATTENTION UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE 4A 125V 4A 125V 1 2 FEED BACK SWI...

Page 26: ...wings for ordering The correct part number is shown in the parts list and may be slightly different or amended since these drawings were prepared 2 All resistance values are indicated in ohms K 103 M 106 3 Resistor wattages are 1 4W or 1 6W unless otherwise specified 4 All capacitance values are indicated in µF P 10 6 µF 5 All voltages are DC voltages unless otherwise specified Note of Capacitors ...

Page 27: ...aired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Wire Connectors 1 Prefix symbol CN means connector can disconnect and reconnect 2 Prefix symbol CL means wire solder holes of the PCB wire is soldered directly 5 Note Mark I is a leadless chip component 6 Voltage indications on the schematics are as shown below...

Page 28: ...3 B4 C1 C2 C3 C4 D1 D2 D3 D4 E1 E2 E3 E4 F1 F2 F3 F4 VIDEO SIGNAL Main 1 3 Schematic Diagram 7 3 7 4 L2403SCM1 MAIN 1 3 Ref No Position IC111 C 2 IC151 A 3 IC801A C 1 Q111 D 1 Q321 E 1 CN801 A 1 ICS TRANSISTORS CONNECTOR ...

Page 29: ...GE DE MÊME TYPE DE 4A 125V 4A 125V CAUTION 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 MAIN 2 3 Ref No Position IC31 J 3 IC601...

Page 30: ...hematic Diagram MAIN 3 3 Ref No Position Ref No Position IC551 M 3 WH501A P 3 WH301A P 2 Q571 O 2 Q572 N 2 TP591 O 2 TP592 O 2 CN571 N 3 TP601 O 3 TRANSISTORS CONNECTORS CONNECTORS IC TEST POINTS CRT Ref No Position Q1511 Q 1 Q1521 Q 1 Q1531 R 1 CN1501 R 2 WH301B P 2 WH501B P 3 TRANSISTORS CONNECTORS ...

Page 31: ...BLE DE RECHANGE DE MÊME TYPE DE 4A 125V 4A 125V 7 9 BL2700F01012 1 7 10 CAUTION 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 MA...

Page 32: ... ISOLATION TRANSFORMER IS REQUIRED 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 MÊME TYPE DE 4A 125V 4A 125V 7 11 7 12 BL2700F01012 1 CAUTION Fixed voltage or Auto voltage selectable power supply circuit is used in t...

Page 33: ...4 Q1521 Collector Q1521 Base WF4 WF13 Q1531 Collector Q1531 Base WF5 7 13 BL2700F01012 2 7 14 CRT CBA Top View CRT CBA Bottom View CRT CBA Ref No Position Q1511 A 2 Q1521 A 2 Q1531 A 2 CN1501 B 1 WH301B B 2 WH501B B 1 TRANSISTORS CONNECTORS ...

Page 34: ...io Signal INITIAL POSITION Unplug unit from AC outlet for at least 5 minutes reconnect to AC outlet and then turn power on Brightness Center Color Center Tint Center Contrast Approx 70 1DIV 0 2V 20ms IC 31 Pin 9 WF6 1DIV 2V 20µs Q 1531 Base WF5 GND 1DIV 10V 20µs Q 572 Collector WF7 GND 1DIV 5V 20µs Q 571 Base WF8 WF1 WF16 Waveforms to be observed at Waveform check points Shown in Schematic Diagram...

Page 35: ... Center Tint Center Contrast Approx 70 WF1 WF16 Waveforms to be observed at Waveform check points Shown in Schematic Diagram 1DIV 200V 20µs CN 571 Pin 1 WF9 GND 1DIV 5V 20µs WH501A Pin 3 WF10 GND 1DIV 10V 5ms CN 571 Pin 4 WF12 1DIV 20V 20µs Q 1521 Collector WF14 1DIV 20V 20µs Q 1531 Collector WF13 1DIV 20V 20µs Q 1511 Collector WF15 1DIV 0 2V 20µs TU 11 Pin 8 WF16 1DIV 1V 5ms IC 551 Pin 7 WF11 GND...

Page 36: ... 1 2 CN691 CLN501 CLN301 AC601 1 2 3 4 5 1 2 3 4 5 CN571 5 4 3 2 1 WH301B GND RED GREEN BLUE V501 CRT ANODE 1 SPEAKER 2 SP801 SPEAKER CN801 T571 FBT TU11 TUNER UNIT WH501A WH501B 8V GND RED GREEN BLUE 8V HEATER 3 GND 2 200V 1 GND 2 200V 1 HEATER 3 CLN801 SP GND BL2700F01012 2 BL2700F01012 1 ...

Page 37: ... DC 8 7V Input 32 FSC OUT Clock Output 3 58MHz 33 N U Not Used 34 AUDIO ATT OUT Audio Signal Output 35 N U Not Used 36 N U Not Used 37 V RAMP F B V Ramp Feed Back 38 V RAMP OUT Vertical Output 39 V RAMP CAP V Ramp OSC Capacitor 40 8 7 VREG OUT DC 8 7V Output 41 N U Not Used 42 H VCO F B H Vco Feed Back 43 AFC FILT Horizontal AFC Filter 44 GND GND 45 FBP IN Flyback Pulse Input 46 H OUT H Pulse Outp...

Page 38: ...nce Adjustment Judgement 73 AFT IN AFT Voltage Input 74 DG ON H Degaussing Coil Control 75 AGC AGC Voltage Input 76 PROTECT 3 Power Supply Protection 77 N U Not Used 78 N U Not Used 79 P ON H Output for P ON H 80 N U Not Used Pin No Signal Name Function ...

Page 39: ...B 2 B 2 B 11 B 11 B 1 SP801 L 13 B 13 A 4 A 2 L1 L1 B2 Scotch Tape 880 Scotch Tape 880 V501 CLN551 DG691 DY551 CRT CBA MAIN CBA AC601 B 3 V501 2 V501 1 DY551 Details for DY551 and surrounding parts SHINWHA TAPE SGT 730 WHITE SHINWHA TAPE SGT 730 BLACK CLN801 PB4 B12 B12 11 1 11 2 L2403CEX ...

Page 40: ...11 3 L2403PEX Packing S 5 S 1 Packing Tape Tape X 5 X 2 X 1 FRONT X 3 X 4 S 2 S 3 S 6 S 4 S 7 ...

Page 41: ...00Z5A014 DY551 DEFLECTION YOKE LLBY00ZSY010 LLBY00ZSY010 L 8 SCREW P TIGHT 4X18 BIND HEAD GBMP4180 L 9 SCREW TAPPING M4X14 DBU14140 L 13 SCREW P TIGHT 3X14 BIND HEAD GBMP3140 PB4 CHASISS NO LABEL L1420PF SP801 SPEAKER S08N04 DSD0808XQ013 V501 CRT A51MAJ196X TCRT190PTD02 V501 1 C P MAGNET JH225 014 or XM04000BV009 CPM E 225 F01 XM04000ETC01 V501 2 WEDGE FT 00110W or XV10000T4001 WEDGE DB25SR XV1000...

Page 42: ...CE1JMASDL100 C111 ELECTROLYTIC CAP 47µF 16V M or CE1CMASTL470 ELECTROLYTIC CAP 47µF 16V M CE1CMASDL470 C112 ELECTROLYTIC CAP 4 7µF 50V M or CE1JMASTL4R7 ELECTROLYTIC CAP 4 7µF 50V M CE1JMASDL4R7 C113 CHIP CERAMIC CAP F Z 0 1µF 25V CHD1EZB0F104 C114 FILM CAP P 0 001µF 50V J or CMA1JJS00102 FILM CAP P 0 001µF 50V J CA1J102MS029 C115 ELECTROLYTIC CAP 0 1µF 50V M or CE1JMASTLR10 ELECTROLYTIC CAP 0 1µF...

Page 43: ...or CCD2JZP0F103 CERAMIC CAP 0 01µF AC250V or CCD2EZA0F103 CERAMIC CAP E Z 0 01µF 500V CCD2JZP0E103 Ref No Description Part No C609 CERAMIC CAP LB 680pF 2K or CA3D681KG004 CERAMIC CAP BN 680pF 2KV or CCD3DKA0B681 CERAMIC CAP 680pF 2KV or CA3D681PAN04 CERAMIC CAP RB 680pF 2KV CA3D681TE006 C610 ELECTROLYTIC CAP 220µF 200V or CA2D221NC088 ELECTROLYTIC CAP 220µF 200V SL X CA2D221S6003 C611 FILM CAP P 0...

Page 44: ...IODE ERB12 06 QDQZ0ERB1206 D608 DIODE 1N5399 B P or NDLZ001N5399 RECTIFIER DIODE ERB12 06 QDQZ0ERB1206 Ref No Description Part No D611 ZENER DIODE MTZJT 7715B or QDTB00MTZJ15 ZENER DIODE DZ 15BSBT265 NDTB00DZ15BS D612 ZENER DIODE MTZJT 7718B or QDTB00MTZJ18 ZENER DIODE DZ 18BSBT265 NDTB00DZ18BS D613 ZENER DIODE MTZJT 773 0B or QDTB0MTZJ3R0 ZENER DIODE DZ 3 0BSBT265 NDTB0DZ3R0BS D614 PCB JUMPER D0 ...

Page 45: ...NQS40KTA1266 TRANSISTOR 2SA1318 T AANP or 2SA1318TZ TRANSISTOR 2SA1318 U AANP or 2SA1318UZ TRANSISTOR 2SA1015 GR TPE2 QQS102SA1015 Q673 TRANSISTOR 2SC2785 F or QQSF02SC2785 TRANSISTOR 2SC2785 H or QQSH02SC2785 TRANSISTOR 2SC2785 J or QQSJ02SC2785 TRANSISTOR KTC3199 GR or NQS10KTC3199 TRANSISTOR KTC3198 GR or NQS40KTC3198 TRANSISTOR 2SC3331 T AANP or 2SC3331TZ TRANSISTOR 2SC3331 U AANP or 2SC3331UZ...

Page 46: ...4 R575 CARBON RES 1 4W J 15 Ω RCX4JATZ0150 R576 CHIP RES 1608 1 10W J 1k Ω RRXAJB5Z0102 R577 CARBON RES 1 4W J 390 Ω RCX4JATZ0391 R578 CARBON RES 1 4W J 15 Ω RCX4JATZ0150 Ref No Description Part No R579 CARBON RES 1 4W J 15 Ω RCX4JATZ0150 R581 PCB JUMPER D0 6 P5 0 JW5 0T R583 METAL OXIDE FILM RES 2W J 2 7 Ω or RN02JZLZ02R7 METAL OXIDE RESISTOR 2W 2 7 Ω J RN02JZPZ02R7 R584 CARBON RES 1 4W J 1k Ω RC...

Page 47: ...CTORS FBR07HA121TB 00 LLBF00ZTU021 Ref No Description Part No BC603 BEAD INDUCTORS FBR07HA121TB 00 LLBF00ZTU021 BC652 BEAD INDUCTORS FBR07HA121TB 00 LLBF00ZTU021 BC653 PCB JUMPER D0 6 P5 0 JW5 0T BC654 BEAD INDUCTORS FBR07HA121TB 00 LLBF00ZTU021 BC655 BEAD INDUCTORS FBR07HA121TB 00 LLBF00ZTU021 BC691 BEAD INDUCTORS FBR07HA121TB 00 LLBF00ZTU021 CF31 CERAMIC TRAP 4 5MHz or FBE455PMR003 CERAMIC TRAP ...

Page 48: ...E or QQSD02SC3468 TRANSISTOR KTC3207 NQSZ0KTC3207 Q1531 TRANSISTOR 2SC2482 TPE6 or QQSZ02SC2482 TRANSISTOR 2SC3468 E AE or QQSE02SC3468 TRANSISTOR 2SC3468 D AE or QQSD02SC3468 TRANSISTOR KTC3207 NQSZ0KTC3207 RESISTORS R1501 PCB JUMPER D0 6 P5 0 JW5 0T R1502 CHIP RES 1 10W J 0 Ω RRXAJB5Z0000 R1503 PCB JUMPER D0 6 P5 0 JW5 0T R1510 METAL OXIDE FILM RES 1W J 15k Ω or RN01153ZU001 METAL OXIDE FILM RES...

Page 49: ...WFT20M4 L2403UD 2004 05 06 ...

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