Sylvania 6620LF4 Service Manual Download Page 1

SERVICE MANUAL

This service manual shows only the differences between 
the model 6620LF4 and the original model EWL2005.
All other information is described in the service manual 
of the model EWL2005.

20

 COLOR LCD TELEVISION

6620LF4

TABLE OF CONTENTS

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Different parts from the original model (EWL2005) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Summary of Contents for 6620LF4

Page 1: ...620LF4 and the original model EWL2005 All other information is described in the service manual of the model EWL2005 20 COLOR LCD TELEVISION 6620LF4 TABLE OF CONTENTS Block Diagrams 1 1 Schematic Diagr...

Page 2: ...IF VIDEO BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM BACKLIGHT SW BACKLIGHT ADJ P ON H VOLUME AUDIO MUTE INPUT 0 INPUT 1 S SW SCL SDA TO LCD BACKLIGHT BLOCK DIAGRAM CN102B CN102A SDA 2 SCL 1 CN112 NO CONNECT...

Page 3: ...ings 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 1...

Page 4: ...the drawings were prepared 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of t...

Page 5: ...2 3 L3200SCIR IR Sensor Schematic Diagram...

Page 6: ...2 4 BL3100F01021 3 Function CBA Top View Function CBA Bottom View IR Sensor CBA Top Bottom View BL3100F01021 2 BL3100F01021 2...

Page 7: ...PK34120 SP801 SPEAKER S0407F10 DSD0807XQ002 SP802 SPEAKER S0407F10 DSD0807XQ002 S1 CARTON L3200UA 1EM420656 S2 STYROFOAM TOP L0301UB 1EM020018A S3 STYROFOAM BOTTOM L0301UB 1EM020019A S4 SET BAG L3207U...

Page 8: ...6620LF4 L3200UA 2005 06 10...

Page 9: ...l which is different from the previous 6620LF4 model For 6620LF4 different LCD Module Assembly model an C or the letter L3220UA is printed on rating label on the back of the unit Refer to the rating l...

Page 10: ...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 procedure or tool...

Page 11: ...it Nominal Limit 1 Intermediate Freq Picture Sound MHz MHz 45 75 41 25 2 Color Killer Sens CH 2 CH 10 CH 55 dB V dB V dB V 15 15 15 20 20 20 3 AFT Pull In Range 10 mV input MHz 2 1 0 7 Description Con...

Page 12: ...m any AC source connect an electrical jumper across the two AC plug prongs Place the instrument AC switch in the on position Connect one lead of an ohmmeter to the AC plug prongs tied together and tou...

Page 13: ...is not isolated from the AC power line The two ground systems are electrically separated by insulation material that must not be defeated or altered 5 Observe original lead dress Take extra care to as...

Page 14: ...s 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 d...

Page 15: ...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...

Page 16: ...he Flat Pack IC about 5 to 6 seconds Fig S 1 1 2 Remove the flat pack IC with tweezers while applying the hot air 3 Bottom of the flat pack IC is fixed with glue to the CBA when removing entire flat p...

Page 17: ...one using a sharp pin or wire to which solder will not adhere iron wire When heating the pins use a fine tip soldering iron or a hot air desoldering machine Fig S 1 4 3 Bottom of the flat pack IC is...

Page 18: ...Fig S 1 6 Note When using a soldering iron care must be taken to ensure that the flat pack IC is not being held by glue When the flat pack IC is removed from the CBA handle it gently because it may b...

Page 19: ...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 1 M on the workbench or other surfac...

Page 20: ...P Spring L Locking Tab S Screw CN Connector Unhook Unlock Release Unplug or Desolder e g 2 S 2 two Screws S 2 2 L 2 two Locking Tabs L 2 5 Refer to the following Reference Notes in the Table Step Loc...

Page 21: ...1 S 1 S 1 S 1 Fig D2 S 10 S 10 S 9 S 8 S 8 S 10 S 7 S 7 S 7 S 3 S 3 S 6 S 6 S 6 S 5 S 5 S 4 S 7 S 7 S 3 S 6 S 6 5 LCD Main CBA Liquid Crystal Panel Unit 7 IR Sensor CBA 4 Main CBA 3 Inverter CBA 2 Jac...

Page 22: ...1 Function CBA IR Sensor CBA Inverter CBA Main CBA LCD Main CBA Unit To Speaker To Speaker CN103A CN312 CN311 CN460 CN101B CN102B CN103B CLN411 CN411 CN490 CN450 CN105 To Liquid Crystal Panel To Liqui...

Page 23: ...control unit Part No N0105UD or N0127UD 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...

Page 24: ...ttons on the remote control unit so that flash stops D2 BRT MENU 5 132 D2 CNT 140 D2 CLR R 77 D2 CLR B 77 D2 TNT 128 D2 SHR 35 D3 BRT MENU 6 117 D3 CNT 139 D3 CLR R 76 D3 CLR B 76 D3 TNT 128 D3 SHR 28...

Page 25: ...he Service mode Press VOL p button on the remote control unit and select C D S 1 mode VIDEO2 Enter the Service mode Press VOL p button on the remote control unit and select C D S 2 mode 5 RF VIDEO1 Wh...

Page 26: ...nit 2 To enter the service mode press POWER 2 7 1 and MUTE buttons on the remote control unit in that order within 5 seconds To cancel the service mode press POWER button on the remote control 3 To in...

Page 27: ...TO POWER SUPPLY BLOCK DIAGRAM TO IF VIDEO BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM BACKLIGHT SW BACKLIGHT ADJ P ON H VOLUME AUDIO MUTE INPUT 0 INPUT 1 S SW SCL SDA TO LCD BACKLIGHT BLOCK DIAGRAM CN102B C...

Page 28: ...Q32 SDA TO SYSTEM CONTROL BLOCK DIAGRAM SCL S SW C Y CN103A TO LCD BLOCK DIAGRAM CN103B VIDEO Y 5 VIDEO Pb Cb 3 VIDEO Pr Cr 1 3 IC781 INPUT SELECT 5 Q703 4 13 12 Q702 14 1 2 Q701 15 SW CONTROL 10 9 11...

Page 29: ...EL L R FILTER L R SAP SW SAP FILTER I2C DECORDER SAP DEMOD SAP OUT FILTER 29 30 TO IF VIDEO BLOCK DIAGRAM TUNER TUNER L CH R CH 21 27 24 IC851 MTS SAP AUDIO SIGNAL PROCESS AUDIO1 L IN JK704 SIF JK705...

Page 30: ...R 4 2 ER 5 1 EG 0 50 EG 1 49 EG 2 48 EG 3 47 EG 4 46 EG 5 45 EB 0 43 EB 1 42 EB 2 41 EB 3 40 EB 4 39 EB 5 38 OFFEV 12 STV1 13 CLKV 14 HMS1 E 7 HMS1 0 13 STH1 42 POL 43 LP 44 CN311 170 60 52 74 169 166...

Page 31: ...25V PANEL 6V LCD MAIN CBA UNIT P 25V ON AL 5V CN102B TO SYSTEM CONTROL BLOCK DIAGRAM TO LCD BACKLIGHT BLOCK DIAGRAM CN103A CN103B AL 7V D 21 3 IC191 3 3V REG IC192 1 5V REG IC193 3 3V REG AL 3 3V D AL...

Page 32: ...1 16 8V REG OUTPUT LOGIC1 OUTPUT LOGIC2 LOGIC OVER VOLTAGE PROTECT SLOW START OSC PWM2 PWM1 STANDBY MODE SW 4 5 7 OVER VOLTAGE PROTECTOR Q451 452 OVER VOLTAGE PROTECTOR Q454 455 7 6 9 8 1 2 13 14 T490...

Page 33: ...ings 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 1...

Page 34: ...the drawings were prepared 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of t...

Page 35: ...AIN 1 4 Ref No Position IC531 D 4 IC533 E 3 IC671 E 2 IC672 E 2 Q501 C 4 Q502 C 4 Q503 B 3 Q505 C 3 Q509 C 3 Q510 B 2 Q511 C 3 Q512 C 2 Q513 C 2 Q531 D 3 Q633 E 1 CN411 F 4 CN101A A 4 CN102A A 3 TP401...

Page 36: ...8 4 L3220SCM2 Main 2 4 Schematic Diagram MAIN 2 4 Ref No Position IC31 I 1 IC851 H 3 IC852 J 4 Q32 J 2 CN113 G 1 TRANSISTOR CONNECTOR ICS...

Page 37: ...matic Diagram L3220SCM3 MAIN 3 4 Ref No Position IC781 P 3 IC801 N 2 Q701 N 3 Q702 N 3 Q703 N 3 Q704 P 1 Q705 O 1 Q706 P 1 Q707 P 2 Q708 P 2 Q802 O 1 Q803 N 1 CN801 M 4 CN802 M 3 CN103A M 2 CONNECTORS...

Page 38: ...u 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...

Page 39: ...INVERTER Ref No Position IC401 A 3 IC402 E 3 Q403 B 1 Q411 B 3 Q412 B 3 Q421 B 4 Q426 B 3 Q433 B 2 Q451 E 4 Q452 D 4 Q454 D 3 Q455 D 3 Q461 E 2 Q462 D 2 Q491 D 3 Q492 D 3 CLN411 A 1 CN450 F 4 CN460 F...

Page 40: ...8 8 L3220SCF Function Schematic Diagram...

Page 41: ...8 9 L3220SCIR IR Sensor Schematic Diagram...

Page 42: ...8 10 L3220SCL1 LCD Main 1 2 Schematic Diagram LCD MAIN 1 2 Ref No Position IC333 B 3 Q301 D 1 CN104 A 3 CN105 A 2 CN211 F 4 CN311 F 4 CN102B A 4 TRANSISTOR CONNECTORS IC...

Page 43: ...CL2 LCD Main 2 2 Schematic Diagram LCD MAIN 2 2 Ref No Position IC151 I 3 IC171 J 3 IC191 H 2 IC192 H 1 IC193 H 2 IC201 J 1 Q131 I 4 Q201 J 1 CN112 L 4 CN312 L 3 CN101B L 4 CN103B G 2 ICS CONNECTORS T...

Page 44: ...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...

Page 45: ...power supply circuit to fail NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal Because a hot chassis ground is present in the power supply circuit an isolation t...

Page 46: ...8 14 BL3100F01022 3 Function CBA Top View Function CBA Bottom View IR Sensor CBA Top Bottom View BL3100F01022 2 BL3100F01022 2...

Page 47: ...L3100F01022 1 INVERTER Ref No Position IC401 D 1 IC402 E 1 Q403 C 1 Q411 D 1 Q412 D 2 Q421 D 1 Q426 D 1 Q433 A 1 Q451 E 1 Q452 E 1 Q454 E 1 Q455 E 1 Q461 A 1 Q462 A 1 Q491 E 2 Q492 E 2 CLN411 C 1 CN45...

Page 48: ...hematic Diagram 1DIV 1 0V 20ns R365 WF2 R202 WF3 1DIV 200mV 20 s Pin 11 of CN103A WF7 1DIV 200mV 20 s Pin 9 of CN103A WF8 1DIV 100mV 400 s Pin 14 of IC801 WF6 1DIV 1 0V 10 s R201 WF4 1DIV 200mV 20 s P...

Page 49: ...4 2 CN105 REMOTE AL 5V GND P ON H INVERTER CBA BACK LIGHT CN450 2 1 BACK LIGHT CN490 2 1 CN311 1 3 2 5 4 7 6 8 9 10 13 12 11 14 15 17 16 19 18 21 20 22 23 24 27 26 25 28 29 30 GND CLKH GND GND HMS1 E...

Page 50: ...L2 L18 L2 L2 L2 L2 L2 L1 L10 L2 L2 L6 A8 A6 B12 B3 A4 B21 B21 A10 S5 B5 B5 B21 L17 A3 A2 A11 B1 L1 L1 A1 A7 L1 B1 L1 L1 B6 B6 B6 B6 B24 B23 B22 LCD Main CBA Liquid Crystal Panel Unit See Electrical Pa...

Page 51: ...11 2 L3222PEX Packing S1 FRONT S2 S5 S4 Tape Tape Packing Tape Packing Tape Packing Tape S3 S6 X1 X4 X3 Some Ref Numbers are not in sequence X2...

Page 52: ...L0100JA 0EM407894 B12 20V TILT STAND HOLDER L4200EA 1EM320145 B21 CLOTH 10X180XT0 5 L0336JG 0EM408827 B22 INSULATION PLATE L3207UH 1EM421108 B23 CAUTION LABEL L3207UH B24 CLOTH 20X65XT0 5 L0100JA 0EM...

Page 53: ...F 50V CHD1JK30B103 C507 CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C508 CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C515 CHIP CERAMIC CAP 1608 B K 0 01 F 50V CHD1JK30B103 C531 ELECTROLYT...

Page 54: ...CHIP CERAMIC CAP 1608 B K 0 022 F 50V CHD1JK30B223 CONNECTORS CN113 PH CONNECTOR WHITE TOP 4P B4B PH K S LF J3PHC04JG017 CN411 PH CONNECTOR TOP 11P B11B PH K S LF J3PHC11JG017 CN801 CONNECTOR BASE 008...

Page 55: ...AJR5Z0472 R21 CHIP RES 1 10W J 270k RRXAJR5Z0274 Ref No Description Part No R23 CHIP RES 1 10W J 2 2k RRXAJR5Z0222 R24 CHIP RES 1 10W J 820k RRXAJR5Z0824 R34 CHIP RES 1608 1 10W 0 RRXAZR5Z0000 R36 CAR...

Page 56: ...10k RRXAJR5Z0103 R757 CHIP RES 1 10W J 47k RRXAJR5Z0473 R758 CHIP RES 1 10W J 47k RRXAJR5Z0473 Ref No Description Part No R759 CHIP RES 1 10W J 10k RRXAJR5Z0103 R782 CHIP RES 1 10W J 10k RRXAJR5Z0103...

Page 57: ...0SP096 C422 CHIP CERAMIC CAP 1608 B K 0 1 F 50V CHD1JK30B104 C423 ELECTROLYTIC CAP 47 F 35V M CA1G470SP096 C425 CHIP CERAMIC CAP 1608 B K 0 1 F 50V CHD1JK30B104 C426 ELECTROLYTIC CAP 47 F 35V M CA1G47...

Page 58: ...2 CHIP RES 1608 1 10W 0 RRXAZR5Z0000 R423 CHIP RES 1 10W J 10k RRXAJR5Z0103 R424 CHIP RES 1 10W J 10k RRXAJR5Z0103 R425 CHIP RES 1 10W J 220 RRXAJR5Z0221 R426 CHIP RES 1 10W J 220 RRXAJR5Z0221 Ref No...

Page 59: ...WX1L3201 006 JS62 PCB JUMPER D0 6 P5 0 JW5 0T JS63 PCB JUMPER D0 6 P5 0 JW5 0T Ref No Description Part No IR SENSOR CBA Consists of the following CAPACITOR C91 ELECTROLYTIC CAP 47 F 10V M H7 CE1AMASSL...

Page 60: ...6620LF4 L3220UA 2006 1 12...

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