Sharp LC-20AV7U Service Manual Download Page 33

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8-6

Power Supply Block Diagram

A7144BLP

Q1005

SW+25V

4A/125V

F601

4A/125V

LINE

FIL

TER

L601

C601

C CORD

BRIDGE

RECTIFIER

D605 - D608

COLD

T601

IC601

ERR

GE DET

Q601

Q603

SWITCHING

CONTR

SWITCHING

MAIN CB

+12V

P-ON-H

CKLIGHT

-SW

HOT CIRCUIT. BE CAREFUL.

INV+22V

+35V

O SYSTEM

CONTR

BLOCK

DIA

GRAM

O LCD

CKLIGHT

BLOCK

DIA

GRAM

Q913

FEED

BACK

IC904

+1.8V REG.

IC905

+5V REG.

Q402

Q403

VT+33V

P-ON+5V(1)

P-ON+9V

O SYSTEM

CONTR

BLOCK

DIA

GRAM

D923

SHUNT

REG.

SWITCHING

Q916

D924

SHUNT

REG.

DTV

-ON-H

AL+3.3V(D)

AL+3.3V(A)

AL+1.2V(D)

Q902

SW+3.3V

D920

SHUNT

REG.

IC901

+1.2V REG.

Q901

SW+3.3V

D916

SHUNT

REG.

Q923

SW+12V

Q905

SW+6.5V

Q908

SW+3.3V

Q909

SW+2.5V

Q918

SW+9V

Q907

SW+5V

Q903

SW+5V

SWITCHING

Q906

SWITCHING

CN102

DTV

-ON+3.3V

CN62

DTV

-ON+2.5V

DTV

-ON+1.8V

DTV

-ON+3.3V

DTV

-ON+1.8V

DTV

-ON+2.5V

CN101

DTV

-ON+5V

CN61

DTV

-ON+5V

DTV MODULE

A UNIT

SWITCHING

Q919

ANEL+25V

ANEL+3.3V

CN1202

ANEL+10.8V

LCD

MODULE

Q910

SW+3.3V

SWITCHING

Q1004

GH-H

O SYSTEM

CONTR

BLOCK

DIA

GRAM

SWITCHING

Q1001

SWITCHING

Q1002

Q1006

SW-6V

ANEL-6V

D1002

SHUNT

REG.

Q1003

+10.8V REG.

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.

For continued protection against risk of fire,

replace only with same type 4 A, 125V fuse.

CAUTION ! :

ATTENTION :

Utiliser un fusible de rechange de m

me type de 4A, 125V.

4A/125V

NOTE:

The voltage for parts in hot circuit is measured using

hot GND as a common terminal.

NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.

Summary of Contents for LC-20AV7U

Page 1: ...ASSEMBLY INSTRUCTIONS 4 1 ELECTRICAL ADJUSTMENT INSTRUCTIONS 5 1 HOW TO INITIALIZE THE LCD TELEVISION 6 1 TROUBLESHOOTING 7 1 BLOCK DIAGRAMS 8 1 SCHEMATIC DIAGRAMS CBA S AND TEST POINTS 9 1 WAVEFORMS 10 1 WIRING DIAGRAM 11 1 IC PIN FUNCTION DESCRIPTIONS 12 1 EXPLODED VIEWS 13 1 MECHANICAL PARTS LIST 14 1 ELECTRICAL PARTS LIST 15 1 CONTENTS LCD COLORTELEVISION In the interests of user safety Requir...

Page 2: ...Condition Unit Nominal Limit 1 Over Scan Horizontal Vertical 5 5 2 Color Temperature AT 80 WHITE FIELD x y K 10500 0 278 0 286 0 005 0 005 3 Resolution Horizontal Vertical line line 400 350 4 Brightness AT 100 WHITE FIELD cd m2 320 Description Condition Unit Nominal Limit 1 Audio Output Power 10 THD Lch Rch W 1 0 1 0 0 8 0 8 2 Audio Distortion 500mW Lch Rch 1 5 1 5 3 0 3 0 3 Audio Freq Response 6d...

Page 3: ...In no case should a unit fail to meet limit specifications Description Condition Unit Nominal Limit 1 RECEIVED FREQ RANGE 28dBm kHz 100 2 ATSC DYNAMIC RANGE min max VHF LOW BAND CH 4 dBm 76 0 VHF HI BAND CH 10 UHF BAND CH 41 3 ATSC SUSCEPTIBILITY TO RANDOM NOISE VHF LOW BAND CH 4 dB 26 VHF HI BAND CH 10 UHF BAND CH 41 4 NTSC CO CHANNEL INTERFERENCE VHF LOW BAND CH 4 dB 6 VHF HI BAND CH 10 UHF BAND...

Page 4: ...tre CA d une sensibilité d au moins 5000Ω V pour mesurer la chute de tension en travers de la résistance Toucher avec la sonde d essai les pièces métalliques exposées qui présentent une voie de retour au châssis antenne coffret métallique tête des vis arbres de commande et des boutons écusson etc et mesurer la chute de tension CA en travers de la résistance Toutes les vérifications doivent être re...

Page 5: ...iring with conventional lead wire solder may cause damage or accident due to cracks As the melting point of lead free solder Sn Ag Cu is higher than the lead wire solder by 40 C we recommend you to use a dedicated soldering bit if you are not familiar with how to obtain lead free wire solder or soldering bit contact our service station or service branch in your area 3 Soldering As the melting poin...

Page 6: ...wo Screws S 2 2 L 2 two Locking Tabs L 2 5 Refer to the following Reference Notes in the Table Step Loc No Part Removal Fig No Remove Unhook Unlock Release Unplug Unclamp Desolder Note 1 Base Plate D1 4 S 1 7 S 2 2 Stand Arm Assembly D1 6 S 3 3 Stand Cover D1 4 Rear Cabinet D1 9 S 4 S 5 S 6 5 Function CBA D2 D3 5 S 7 CL1107 6 Tilt Stand Holder D2 2 S 8 3 Stand Cover 4 Rear Cabinet 2 Stand Arm Asse...

Page 7: ...4 2 A7144_45DC Fig D1 4 Rear Cabinet S 1 S 4 2 Stand Arm Assembly 3 Stand Cover S 3 S 4 S 4 S 4 S 6 S 4 S 2 S 2 S 2 S 3 1 Base Plate S 5 ...

Page 8: ...er 14 Speaker 6 Tilt Stand Holder Speaker Holder S 10 S 8 S 9 S 7 10 Main CBA S 11 9 DTV Module CBA Unit Module PCB Holder 11 LCD Module S 11 S 11 S 11 S 11 S 12 S 12 S 12 S 12 S 12 S 13 S 11 12 Junction A CBA S 7 Desolder Desolder Speaker Holder S 13 13 Junction B CBA S 12 S 12 Fig D2 ...

Page 9: ...2 CN801 To Speaker Fig D3 CL1104 To Speaker CN1201 CN1202 CN1301 CN401 CN402 CN403 To LCD Module Main CBA CN1302 IR Sensor CBA CN62 CN61 CN101 CN102 DTV Module CBA Unit CL1107 Function CBA To LCD Module CL801 Junction A CBA CL802 Junction B CBA ...

Page 10: ...r 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 No Part Removal Fig No Remove Unhook Unlock Release Unplug Unclamp Desolder Note 1 Base Plate D1 2 S 1 7 S 2 2 Stand Arm Assembly D1 6 S 3 3 Stand Cover D1 4 Rear Cabinet D1 10 S 4 S 5 5 Function CBA D2 D3 2 S 6 3 S 7 CL1107 6 Tilt Stand Holder D2 2 S 8 7 IR Sensor CBA D2 D3 S 9 CL1...

Page 11: ...4 6 A7144_45DC Fig D1 4 Rear Cabinet S 1 2 Stand Arm Assembly 3 Stand Cover S 3 S 3 S 4 S 4 S 4 S 5 S 4 S 2 S 2 S 2 1 Base Plate ...

Page 12: ... 7 IR Sensor CBA 13 Front Cabinet 12 Speaker 12 Speaker 6 Tilt Stand Holder S 10 S 8 S 9 S 6 10 Main CBA S 11 9 DTV Module CBA Unit Module PCB Holder 11 LCD Module S 11 S 11 S 11 S 11 S 12 S 12 S 12 S 12 S 13 S 11 S 6 S 13 S 7 S 7 Washer Fig D2 ...

Page 13: ...e Wiring Diagram CN802 CN801 To Speaker Fig D3 CL1104 To Speaker CN1201 CN1202 CN1301 CN401 CN402 CN403 To LCD Module Main CBA CN1302 IR Sensor CBA CN62 CN61 CN101 CN102 DTV Module CBA Unit CL1107 Function CBA To LCD Module ...

Page 14: ... Initial Setting General Enter Service mode Set initial data as shown on table 1 Press the number after MENU on the table to access next item Press CH o p to change data value Table 1 Initial Data Item Button on the remote control Data Value RF BRT MENU 1 122 RF CNT 200 RF CLR R 65 RF CLR B 75 RF TNT 129 RF SHR 112 V BRT MENU 2 122 V CNT 174 V CLR R 81 V CLR B 101 V TNT 135 V SHR 112 S BRT MENU 3 ...

Page 15: ...n adjust DB C D1 or DR C D1 Refer to 1 Initial Setting RF INPUT1 APL 20 Press 3 button to select COB C D1 for Blue adjustment Press 1 button to select COR C D1 for Red adjustment When x value and y value are not within specification adjust COB C D1 or COR C D1 Refer to 1 Initial Setting 6 INPUT2 APL 80 Press 6 button to select C DB C D2 for Blue adjustment Press 4 button to select C DR C D2 for Re...

Page 16: ...nd press 3 on the service remote control selecting D1 BRT mode 3 Make sure that contrast and brightness controls are set to initial position 4 Confirm C position was beginning to bright 5 If C position was beginning to bright no need to adjust 6 If C position is not available or to be highly brightness then adjust IIC BUS dada RF INPUT1 BRT INPUT2 D1 BRT 7 Turn the power off and on again Main powe...

Page 17: ...ON 1 To enter the service mode press MENU and POWER buttons on the TV unit simultaneously in the standby mode 2 To initialize the LCD television press DISPLAY button on the remote control unit 3 Confirm FF indication on the upper right of the screen ...

Page 18: ... AL 1 2V D is not output 7 4 14 AL 3 3V A is not output 7 5 15 P ON 5V 1 is not output 7 5 16 12V is not output 7 5 17 P ON 9V is not output 7 5 18 DTV ON 1 8V is not output 7 6 19 PANEL 6V is not output 7 6 20 The key operation is not functioning 7 6 21 No operation is possible from the remote control unit 7 7 22 Picture does not appear normally Tuner input Analog Video input S Video input 7 8 23...

Page 19: ... Check the presence that the rectifying diode or circuit is shorted in each rectifying circuit of secondary side and service it if defective After servicing replace the fuse When the output voltage fluctuates FLOW CHART NO 3 Does the photocoupler circuit on the secondary side operate normally No Yes Check IC601 Q913 D909 D933 and their periphery and service it if defective When buzz sound can be h...

Page 20: ...oltage supplied to the cathode of D901 No Yes Check D901 C901 and their periphery circuit and service it defective DTV ON 2 5V is not output FLOW CHART NO 9 Yes No Check Q909 D924 and their periphery circuit and service it if defective See FLOW CHART No 8 DTV ON 3 3V is not output FLOW CHART NO 8 Yes No Is approximately 5V voltage supplied to the cathode of D906 Check D906 C905 and their periphery...

Page 21: ...T NO 11 Is approximately 6 8V voltage supplied to the cathode of D903 No Yes Check D903 C903 and their periphery circuit and service it if defective Yes Check Q907 D922 and their periphery circuit and service it if defective Yes See FLOW CHART No 11 See FLOW CHART No 10 Check Q902 D920 and their periphery circuit and service it if defective No Check Q906 and DTV ON H line and service it if defecti...

Page 22: ...approximately 12V voltage supplied to the cathode of D902 Is approximately 11 8V voltage supplied to the collector of Q923 No Is the voltage of base on Q923 lower than the voltage of emitter on Q923 when turning the power on See FLOW CHART No 16 Yes Replace Q923 No P ON 5V 1 is not output FLOW CHART NO 15 Is approximately 6 8V voltage supplied to the cathode of D903 Check Q903 D921 and their perip...

Page 23: ... Check the switches SW1101 SW1102 SW1103 SW1104 SW1105 SW1107 SW1111 and their periphery and service it if defective Yes Check IC1202 and the periphery circuit and service it if defective Yes No PANEL 6V is not output FLOW CHART NO 19 Is approximately 6V voltage supplied to the anode of D931 Check if there is any leak or short circuit on the loaded circuit and service it if defective Check D931 C9...

Page 24: ...d Pin 3 of CN1302 and service it if defective Yes Is the L pulse supplied to the Pin 3 of CN1302 Yes Is 3 3V voltage supplied to Pin 3 terminal of the infrared remote control receiver RV1142 No No operation is possible from the remote control unit FLOW CHART NO 21 Operation is possible from the remote control unit Check AL 3 3V D line and service it if defective No Replace the infrared remote cont...

Page 25: ...defective Check the line between Pin 64 of IC1202 and Pin 19 of CN62 and service it if defective Are the Y signals inputted to the Pin 73 of IC1202 Are the Pb signals inputted to the Pin 54 of IC1202 Are the Pr signals inputted to the Pin 64 of IC1202 Are the video signals inputted to the specific input terminal FLOW CHART NO 22 Are the video signals outputted to the specific output terminal Are t...

Page 26: ...Audio is not outputted normally Tuner input FLOW CHART NO 25 Are the DIF signals outputted to the Pins 11 12 of CN62 No Yes Check the line between Pins 11 12 of CN62 and TU61 and service it defective Are the audio L R signals outputted to the Pin 15 16 of CN62 No Yes Replace DTV MODULE CBA UNIT Are the audio L R signals inputted to the Pins 5 14 of IC852 No Yes Check the line between Pins 5 14 of ...

Page 27: ...Are the audio L R signals outputted to the Pins 3 13 of IC852 No Yes Check IC852 and the periphery circuit and service it if defective Are the audio L R signals outputted to the Pins 11 14 of IC801 No Yes Check SP801 SP802 JK801 and their periphery circuit and service it if defective Check IC801 and the periphery circuit and service it if defective Audio is not outputted normally Audio input termi...

Page 28: ...IO MUTE INPUT 0 INPUT 1 S SW SCL SDA IC61 MEMORY SCL 6 5 SDA 29 BUS OPEN 5 AFT IN 44 FSC AFT IN FSC Q917 IR SENSOR CBA CL1104 CN1302 REMOTE SENSOR RV1142 REMOTE 3 3 157 SDA SCL BACKLIGHT ADJ 20 TO LCD BACKLIGHT BLOCK DIAGRAM BACKLIGHT ADJ VCOM TO LCD BLOCK DIAGRAM BACKLIGHT SW BACKLIGHT SW 152 DTV ON H DTV ON H IC1205 MEMORY SCL 6 SDA 5 7 WP 17 16 15 155 153 IC101 DTV SIGNAL PROCESS DTV MODULE CBA...

Page 29: ...O IN TO SYSTEM CONTROL BLOCK DIAGRAM S SW IF MUTE C Y INPUT 0 INPUT 1 INPUT 2 TO SYSTEM CONTROL BLOCK DIAGRAM Q707 Q708 INPUT 2 INV Q709 TUNER UNIT CF31 IC31 IF SIGNAL PROCESS VIF AMP VIDEO DET VCO 4 5MHz FILTER RF AGC AMP SIF AMP 16 13 18 17 4 7 8 1 TO SYSTEM CONTROL BLOCK DIAGRAM AFT IN SIF TRAP 11 FSC IF AGC DET AFT EQ AMP 2 DEFEAT RF CVBS S VIDEO C S VIDEO Y VIDEO Y VIDEO Pb VIDEO Pr VIDEO IN1...

Page 30: ...0 AUDIO R IN2 OFFSET CANCEL 14 IC801 AUDIO AMP 7 VOLUME 11 AMP AMP MUTE STANDBY CONTROL R CH L CH 2 Q802 JK801 HEADPHONE JACK SP801 SPEAKER R CH P ON 5V 2 13 2 WF7 AUDIO1 AUDIO2 AUDIO1 AUDIO2 SIF BB SW INPUT VCA SIF DEMOD INPUT 0 INV INPUT 1 INV INPUT 2 INV 6 DTV DTV 5 1 DTV SPDIF DTV AUDIO L TO DTV MODULE BLOCK DIAGRAM DTV AUDIO R AUDIO SIGNAL AUDIO MUTE JUNCTION B CBA CL802 SP802 SPEAKER L CH JU...

Page 31: ...O DECODER AUDIO D A CONVERTER SDRAM I F FLASH MEMORY I F IC201 DDR SDRAM 2 2 DTV SPDIF 14 14 SDA 15 15 SCL 4 5 5 5 TU SDA 4 4 TU SCL CN62 L CH R CH SDA SCL BUS CONT 1 1 79 81 85 87 89 91 92 94 96 98 102 104 106 2 2 55 56 58 60 61 116 119 120 124 125 127 129 130 3 3 1 2 7 12 20 206 209 211 213 216 4 4 23 25 27 29 32 36 41 44 47 48 50 52 54 205 5 5 1 9 16 25 48 6 6 29 36 38 45 7 7 28 32 35 42 8 8 2 ...

Page 32: ...R 4 25 OR 5 24 OG 0 22 OG 1 21 OG 2 20 OG 3 19 OG 4 18 OG 5 17 OB 0 15 OB 1 14 OB 2 13 OB 3 12 OB 4 11 OB 5 10 ER 0 6 ER 1 5 ER 2 4 ER 3 3 ER 4 2 ER 5 1 EG 0 31 EG 1 30 EG 2 22 EG 3 21 EG 4 20 EG 5 19 EB 0 17 EB 1 16 EB 2 15 EB 3 14 EB 4 13 EB 5 12 OFFEV 24 STV 26 CLKV 28 VCOM 35 STH 31 POL 32 LP 33 CLEAR 34 CN1201 148 147 144 143 142 141 140 139 138 137 133 132 131 130 129 128 127 126 112 117 116...

Page 33: ... 5V 5 5 DTV ON 1 8V 6 6 DTV ON 3 3V DTV ON 1 8V DTV ON 2 5V CN101 DTV ON 5V 3 3 CN61 DTV ON 5V DTV MODULE CBA UNIT SWITCHING Q919 PANEL 25V 2 PANEL 25V 3 PANEL 3 3V 5 PANEL 3 3V 6 CN1202 PANEL 10 8V 8 TO LCD MODULE Q910 SW 3 3V SWITCHING Q1004 VGH H TO SYSTEM CONTROL BLOCK DIAGRAM SWITCHING Q1001 SWITCHING Q1002 Q1006 SW 6V PANEL 6V 10 D1002 SHUNT REG Q1003 10 8V REG CAUTION Fixed voltage or Auto ...

Page 34: ... SWITCH Q441 Q444 T402 OVER VOLTAGE PROTECTOR Q442 443 9 8 3 5 2 6 1 4 10 7 CURRENT CONTROL SWITCH Q461 Q464 T403 OVER VOLTAGE PROTECTOR Q462 463 9 8 3 5 2 6 1 4 10 7 OVER VOLTAGE PROTECTOR Q404 Q406 10V REG OVER CURERENT PROTECTOR Q425 Q405 SWITCHING SWITCHING SWITCHING SWITCHING INV 22V TO POWER SUPPLY BLOCK DIAGRAM BACKLIGHT ADJ Q401 SW 22V TO SYSTEM CONTROL BLOCK DIAGRAM SWITCHING Q407 NOTE CB...

Page 35: ...ified by the mark in the schematic diagram and the parts list Before replacing any of these components read the parts list in this manual carefully The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock fire or other hazards Note 1 Do not use the part number shown on these drawings for ordering The correct part numbe...

Page 36: ... since 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 the service manual 4 Voltage indications on the schematics are as shown below Plug the TV power cord into a standard AC outlet 2 3 1 5 0 5 0 Voltage Indicates that the voltage is not consistent ...

Page 37: ...24 4 3 0 8 3 24 4 4 0 7 4 0 5 1 0 5 3 3 6 1 4 6 3 3 7 0 7 0 8 1 2 8 10 8 9 0 9 0 10 1 2 10 6 2 11 0 7 11 0 12 0 5 12 1 2 13 0 7 13 0 7 14 1 3 14 0 5 15 1 1 15 0 7 16 0 16 1 3 17 1 2 17 1 1 18 0 9 18 0 19 0 7 19 1 2 20 0 7 20 0 9 21 1 3 21 0 7 22 1 3 22 0 8 23 0 23 0 24 1 2 24 0 25 1 0 25 0 26 0 9 26 0 27 0 8 27 0 28 1 0 28 2 1 29 1 4 29 0 30 0 30 1 3 31 0 31 1 3 32 1 7 32 0 33 0 3 33 0 34 3 4 35 1...

Page 38: ...4 3 1 5 3 2 6 0 7 2 9 8 3 2 9 1 7 10 0 1 11 0 12 3 4 13 0 14 3 1 15 3 1 CN62 1 2 3 3 3 0 4 3 4 5 2 6 6 1 9 7 8 0 9 0 10 0 11 0 12 0 13 0 14 15 2 6 16 2 6 17 0 18 19 20 VOLTAGE CHART Pin No Voltage Pin No Voltage MAIN 2 5 Ref No Position IC31 I 1 IC61 K 1 IC851 G 3 IC852 J 4 CN61 L 2 CN62 G 2 ICS CONNECTORS ...

Page 39: ... A7144SCM3 Main 3 5 Junction A Junction B Schematic Diagram Comparison Chart of Models and Marks Model Mark LC 20AV7U LC 20SH7U A B MAIN 3 5 Ref No Position IC801 N 2 Q707 P 3 Q708 P 2 Q709 P 2 Q802 N 1 CN801 N 3 CN802 N 3 IC TRANSISTORS CONNECTORS ...

Page 40: ...ematic Diagram MAIN 4 5 Ref No Position Q401 T 2 Q402 T 1 Q403 T 1 Q404 T 2 Q405 T 2 Q406 T 3 Q407 T 1 Q421 U 4 Q422 W 4 Q423 W 4 Q424 U 3 Q425 V 3 Q441 U 3 Q442 W 3 Q443 W 2 Q444 U 2 Q461 U 1 Q462 W 2 Q463 W 1 Q464 U 1 CN401 X 4 CN402 X 4 CN403 X 3 CONNECTORS TRANSISTORS ...

Page 41: ...mponents 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 A7144SCM5 Main 5 5 Schematic Diagram MAIN 5 5 Ref No Position IC601 AA 1 IC901 DD 2 IC904 BB 2 IC905 BB 1 Q601 Y 2 Q603 Z 2 Q90...

Page 42: ...9 8 NOTE CBA AND PWB MEANS PRINTED WIRING BOARD A7144SCF Function Schematic Diagram ...

Page 43: ...9 9 NOTE CBA AND PWB MEANS PRINTED WIRING BOARD A7144SCIR IR Sensor Schematic Diagram Comparison Chart of Models and Marks Model Mark LC 20AV7U LC 20SH7U A B ...

Page 44: ...9 10 NOTE CBA AND PWB MEANS PRINTED WIRING BOARD A7144SCD1 DTV Module 1 2 Schematic Diagram DTV MODULE 1 2 Ref No Position IC101 E 1 CN251 A 1 CONNECTOR IC ...

Page 45: ...NG BOARD A7144SCD2 DTV Module 2 2 Schematic Diagram DTV MODULE 2 2 Ref No Position IC201 H 4 IC202 J 4 IC252 G 2 IC291 I 2 Q211 J 2 Q212 J 2 Q213 J 2 Q214 J 2 Q243 I 1 Q244 J 1 Q245 J 1 Q251 K 2 CN101 L 2 CN102 L 1 ICS TRANSISTORS CONNECTORS ...

Page 46: ...isolation transformer must be used Also in order to have the ability to increase the input slowly when troubleshooting this type power supply circuit a variable isolation transformer is required MAIN CBA Ref No Position Ref No Position IC31 A 3 Q802 C 5 IC61 A 3 Q901 E 2 IC601 C 5 Q902 D 1 IC801 C 5 Q903 D 2 IC851 B 3 Q905 D 2 IC852 B 3 Q906 D 2 IC901 D 2 Q907 D 2 IC904 C 3 Q908 D 3 IC905 E 4 Q909...

Page 47: ...electable 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 Because a hot chassis ground is present in the power supply circuit an isolation transformer must be used Also in...

Page 48: ... Function CBA Bottom View BA7120F01021 1 IR Sensor CBA Top View IR Sensor CBA Bottom View BA7120F01021 2 BA7120F01021 3 BA7120F01021 4 Junction A CBA Top Bottom View A Junction B CBA Top Bottom View A Comparison Chart of Models and Marks Model Mark LC 20AV7U LC 20SH7U A B ...

Page 49: ...rm check points Shown in Schematic Diagram CVBS 0 2V 20µs WF1 Pin 71 of IC1202 S VIDEO Y 0 2V WF2 Pin 76 of IC1202 20µs S VIDEO C 0 2V WF3 Pin 57 of IC1202 20µs AUDIO 0 1V 0 5ms WF7 Pin 14 of IC801 VIDEO Pr 0 2V 20µs Pin 66 of IC1202 WF6 VIDEO Pb 0 2V 20µs Pin 56 of IC1202 WF5 VIDEO Y 0 2V 20µs Pin 75 of IC1202 WF4 ...

Page 50: ...D DIF AGC A GND SMART ANT NU DTV ON 1 8V DTV ON 2 5V DTV ON 3 3V D GND DTV ON H2 NU DIF OUT2 A GND DTV VIDEO NU DTV AUDIO L DTV AUDIO R A GND DTV Y DTV Pr DTV Pb CN1201 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 OB 4 OB 5 GND CLKL GND ER 0 ER 1 ER 2 ER 3 ER 4 ER 5 OB 3 OB 2 OB 1 OB 0 GND OG 5 OG 4 OG 3 OG 2 OG 1 OG 0 GND OR 5 OR 4 OR 3 OR 2 OR 1 31 30 29 32 OR 0 GND...

Page 51: ...on 1 VDD 3 3V 3 3V VDD 2 VDD 3 3V 3 3V VDD 3 KEY IN 1 Key Input 1 4 KEY IN 2 Key Input 2 5 AFT IN AFT Voltage Input 6 PROTECT 1 Power Supply Protection 1 7 PROTECT 2 Power Supply Protection 2 8 PROTECT 4 Power Supply Protection 4 9 ADIN6 Reference Terminal 10 VSS GND 11 NU Not Used 12 NU Not Used 13 NU Not Used 14 NU Not Used 15 DTV S SOUT DTV Serial Data Out 16 DTV S SIN DTV Serial Data In 17 DTV...

Page 52: ...GND 81 VSS GND 82 VDD 3 3V 3 3V VDD 83 VDD 3 3V 3 3V VDD Pin No Signal Name Function 84 NU Not Used 85 NU Not Used 86 NU Not Used 87 NU Not Used 88 NU Not Used 89 EB 5 Pixel Data Output EB 90 EB 4 Pixel Data Output EB 91 EB 3 Pixel Data Output EB 92 EB 2 Pixel Data Output EB 93 EB 1 Pixel Data Output EB 94 RESET Reset Output 95 EB 0 Pixel Data Output EB 96 EG 5 Pixel Data Output EG 97 EG 4 Pixel D...

Page 53: ...l 157 BACKLIGHT SW Inverter Control Signal Output 158 BOOT SEL Boot Select 159 VSS GND 160 VSS GND Pin No Signal Name Function 1 ANODE Anode LED 2 CATHODE Cathode LED 3 EMITTER Phototransistor Emitter 4 COLLECTOR Phototransistor Collector Pin No Signal Name Function Pin No Signal Name Function 1 CH1 IN A Audio Signal Intput R ch 2 MUTE STANDBY Mute Switching 3 NU Not Used 4 GND GND 5 RF Reference ...

Page 54: ...Signal Output R ch 4 3Y Audio Signal 3 Input R ch 5 1Y Audio Signal 1 Input R ch 6 INH Input Select Signal 7 VEE GND 8 GND GND 9 B Input Select B Signal 10 A Input Select A Signal 11 3X Audio Signal 3 Input L ch 12 0X Audio Signal 0 Input L ch 13 X COM Audio Signal Output L ch 14 1X Audio Signal 1 Input L ch 15 2X Audio Signal 2 Input L ch 16 VDD VDD Pin No Signal Name Function 1 GND GND 2 V IN In...

Page 55: ... B3 B22 L2 S10 L5 L7 L24 L6 A7 A3 B1 B1 SP801 SP802 See Electrical Parts List for parts with this mark Main CBA AC601 Function CBA IR Sensor CBA B10 L7 B13 L18 B2 L21 L1 L7 L9 L21 B4 B9 DTV Module CBA Unit B8 L20 L20 A9 LCD1 L22 Junction A CBA L6 B1 B1 Junction B CBA CL1401 B31 B31 S11 A1 A22 A11 L1 L3 B38 B38 L7 B39 B37 A24 A24 L23 L23 L23 L6 L6 CL1402 B7 ...

Page 56: ...S10 L5 L7 L2 A7 A3 L2 SP801 SP802 See Electrical Parts List for parts with this mark Main CBA AC601 Function CBA IR Sensor CBA B10 L7 B13 L18 B2 L21 L7 L9 L21 B4 B9 DTV Module CBA Unit B8 L20 L20 A9 LCD1 L22 L2 CL1401 S11 A1 A22 L2 L3 L7 L7 A11 B38 B38 L7 L7 A12 A12 L23 L23 L23 B7 CLN801 CLN802 CL1402 ...

Page 57: ...e Packing Tape S3 Packing Tape S10 Shipping Label Packing Tape Some Ref Numbers are not in sequence X4 X6 X3 X2 X1 S13 S1 FRONT FRONT S2 S4 Tape Packing Tape S3 Packing Tape S10 Shipping Label Packing Tape Some Ref Numbers are not in sequence X4 X6 X3 X2 X1 S13 ...

Page 58: ...13 4 A7144_45PEX LC 20SH7U S1 FRONT FRONT S2 S4 Tape Packing Tape Packing Tape S3 X1 Some Ref Numbers are not in sequence X4 X6 X3 X2 Packing Tape Packing Tape S10 Shipping Label ...

Page 59: ...ommended replacement parts shown in this service manual may create shock fire or other hazards HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following informations 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION in USA Contact your nearest SHARP Parts Distributor to order For location of SHARP Parts Distributor Please call Toll Free 1 800 BE SHA...

Page 60: ...GCJP3100 SCREW P TIGHT M3 10 WASHERHEAD L7 9HSGCJP3120 SCREW P TIGHT 3X12 WASHER HEAD L18 9HSFPH34120 DOUBLE SEMS SCREW M4X12 BLAK L20 9HSGBHB4080 SCREW B TIGHT M4X8 BIND HEAD BLK L21 9HS1EM422564 DOUBLE SEMS SCREW M3X8 M3X8 L22 9HS1EM422563 DOUBLE SEMS SCREW M3X10 M3X10 L23 9HSGDJP3080 SCREW P TIGHT M3X8 DISH HEAD L24 A 9HSGCJP3080 SCREW TAP TIGHT WASHER P TIGHT LCD1 9HSUF200XD LCD MODULE LC5 20I...

Page 61: ... SHARP Parts Distributor to order For location of SHARP Parts Distributor Please call Toll Free 1 800 BE SHARP Comparison Chart of Models and Marks Model Mark LC 20AV7U LC 20SH7U A B LISTE DES PIÈCES ÉLECTRIQUES CHANGE DES PIECES REMARQUE CBA ET PWB SIGNIFIENT CARTE DE CIRCUITS IMPRIMES CHANGE DES PIECES Les pièces de rechange qui pr élelesentent ces caract éleristiques sp éleciales de s élecurit ...

Page 62: ...ERAMIC CAP F Z 1µF 10V C77 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C79 9HSHD1JJ3CH330 CHIP CERAMIC CAP 1608 CH J 33pF 50V C83 9HSRXAZR5Z0000 CHIP RES 1608 1 10W 0 Ω C85 9HSHD1JJ3CH331 CHIP CERAMIC CAP CH J 330pF 50V C86 9HSHD1JJ3CH331 CHIP CERAMIC CAP CH J 330pF 50V C87 9HSHD1JK30B102 CHIP CERAMIC CAP 1608 B K 1000pF 50V C89 9HSHD1JJ3CH221 CHIP CERAMIC CAP CH J 220pF 50V C90 9HSE1JMASDL...

Page 63: ... B 9HSHD1JJ3CH561 CHIP CERAMIC CAP CH J 560pF 50V C754 A 9HSHD1JK30B152 CHIP CERAMIC CAP B K 1500pF 50V C754 B 9HSHD1JJ3CH561 CHIP CERAMIC CAP CH J 560pF 50V C786 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C791 9HSHD1JJ3CH101 CHIP CERAMIC CAP 1608 CH J 100pF 50V C801 A 9HSE1CMASDL221 ELECTROLYTIC CAP 220µF 16V M C801 B 9HSE1CMASDL471 ELECTROLYTIC CAP 470µF 16V M C802 A 9HSE1CMASDL221 ELECT...

Page 64: ...CAP 1608 F Z 0 1µF 25V C1206 9HSE1CMASDL101 ELECTROLYTIC CAP 100µF 16V M C1207 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C1208 9HSE1CMASDL101 ELECTROLYTIC CAP 100µF 16V M C1209 9HSHD1JJ3CH101 CHIP CERAMIC CAP 1608 CH J 100pF 50V C1210 9HSHD1JK30B103 CHIP CERAMIC CAP 1608 B K 0 01µF 50V C1211 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C1213 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z ...

Page 65: ...HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C1704 9HSHD1EZ30F104 CHIP CERAMIC CAP 1608 F Z 0 1µF 25V C1705 9HSHD1AZ30F105 CHIP CERAMIC CAP F Z 1µF 10V CONNECTORS CN401 9HSB17D02AP001 BACK LIGHT CONNECTOR 1717369 1 CN402 9HSB17D02AP001 BACK LIGHT CONNECTOR 1717369 1 CN403 9HSB17D02AP001 BACK LIGHT CONNECTOR 1717369 1 CN801 B 9HS383C02UG004 CONNECTOR PRINT OSU 008283021200000S CN802 B 9HS383C0...

Page 66: ...E 1N5397 B D607 9HSDLZ001N5397 DIODE 1N5397 B D608 9HSDLZ001N5397 DIODE 1N5397 B D609 9HSDTB0MTZJ5R6 ZENER DIODE MTZJT 775 6B D611 9HSDTB00MTZJ22 ZENER DIODE MTZJT 7722B D612 9HSJW5 0T PCB JUMPER D0 6 P5 0 D613 9HSDTZ001SS133 SWITCHING DIODE 1SS133 T 77 D614 9HSDTZ001SS133 SWITCHING DIODE 1SS133 T 77 D624 9HSDTB00MTZJ39 ZENER DIODE MTZJT 7739B D801 9HSDTZ001SS133 SWITCHING DIODE 1SS133 T 77 D802 9...

Page 67: ...1 9HSSZBA0TMS003 IC MTS DECORDER AN5832SA E1V IC852 9HSSZBA0TTS162 IC SWITCHING TC4052BF ELNF IC901 9HSSZBA0TSS229 VOLTAGE REGULATOR LD1117SC R IC904 9HSSZBA0SSH054 VOLTAGE REGULATOR PQ070XF01SZH IC905 9HSSZBA0SJY041 IC VOLTAGE REGULATOR 5V KIA7805API P IC1202 9HSSZAB0RHT162 IC DVP V6 R8A02030A94FP RF0Z IC1205 9HSSZBA0TRM071 IC BR24L64F WE2 COILS L21 9HSJW5 0T PCB JUMPER D0 6 P5 0 L22 9HSLAXJATTU1...

Page 68: ...785 F Q923 9HSQSY02SA950F TRANSISTOR 2SA950 Y TE2 F T Q1001 9HSQSF02SC2785 TRANSISTOR 2SC2785 F Q1002 9HSQSF02SA1175 TRANSISTOR 2SA1175 F Q1003 9HSQSY2SC2120F TRANSISTOR 2SC2120 Y TE2 F T Q1004 9HSQSF02SC2785 TRANSISTOR 2SC2785 F Q1005 9HSQSF02SA1175 TRANSISTOR 2SA1175 F Q1006 9HSQSF02SC2785 TRANSISTOR 2SC2785 F Q1007 9HSQSF02SC2785 TRANSISTOR 2SC2785 F RESISTORS R17 9HSRXAZR5Z0000 CHIP RES 1608 1...

Page 69: ...JR5Z0332 CHIP RES 1 10W J 3 3k Ω R441 9HSRXAJR5Z0391 CHIP RES 1 10W J 390 Ω R442 9HSRXAJR5Z0391 CHIP RES 1 10W J 390 Ω R443 9HSRXAJR5Z0102 CHIP RES 1 10W J 1k Ω R444 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R445 9HSRXAJR5Z0102 CHIP RES 1 10W J 1k Ω R446 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R447 9HSRXAJR5Z0220 CHIP RES 1 10W J 22 Ω R448 9HSRXAJR5Z0220 CHIP RES 1 10W J 22 Ω R449 9HSRXAJR5Z0472 CHIP RE...

Page 70: ...XAJR5Z0472 CHIP RES 1 10W J 4 7k Ω R810 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R811 9HSCX4JATZ0103 CARBON RES 1 4W J 10k Ω R812 9HSRXAJR5Z0472 CHIP RES 1 10W J 4 7k Ω R813 9HSRXAJR5Z0473 CHIP RES 1 10W J 47k Ω R814 9HSRXAJR5Z0223 CHIP RES 1 10W J 22k Ω R815 9HSCX4JATZ0181 CARBON RES 1 4W J 180 Ω R816 9HSRXAJR5Z0223 CHIP RES 1 10W J 22k Ω R817 9HSRXAJR5Z0473 CHIP RES 1 10W J 47k Ω R818 9HSRXAJR5Z082...

Page 71: ...HSCX4JATZ0681 CARBON RES 1 4W J 680 Ω R938 9HSRXAFR5H2200 CHIP RES 1 10W F 220 Ω R939 9HSRXAFR5H2202 CHIP RES 1 10W F 22k Ω R940 9HSCX4JATZ0103 CARBON RES 1 4W J 10k Ω R941 9HSCX4JATZ0332 CARBON RES 1 4W J 3 3k Ω R942 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R943 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R949 9HSCX4JATZ0103 CARBON RES 1 4W J 10k Ω R950 9HSCX4JATZ0154 CARBON RES 1 4W J 150k Ω R952 9HSCX4J...

Page 72: ...6 Ω R1210 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1211 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1212 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1213 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1214 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1215 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1216 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1217 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1218 9HSRXAJR5Z0560 CHIP RES 1 10W J 56 Ω R1219 9HS...

Page 73: ...9HSRXAJR5Z0330 CHIP RES 1 10W J 33 Ω R1342 9HSRXAJR5Z0472 CHIP RES 1 10W J 4 7k Ω R1343 9HSRXAJR5Z0101 CHIP RES 1 10W J 100 Ω R1344 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R1345 9HSRXAZR5Z0000 CHIP RES 1608 1 10W 0 Ω R1346 9HSRXAJR5Z0103 CHIP RES 1 10W J 10k Ω R1347 9HSRXAZR5Z0000 CHIP RES 1608 1 10W 0 Ω R1348 9HSRXAJR5Z0101 CHIP RES 1 10W J 100 Ω R1349 9HSRXAJR5Z0101 CHIP RES 1 10W J 100 Ω R1350 9H...

Page 74: ...00B05 T401 9HSTZ2PC0MS006 TRANS INVERTER ETJV27ZK27AC T402 9HSTZ2PC0MS006 TRANS INVERTER ETJV27ZK27AC T403 9HSTZ2PC0MS006 TRANS INVERTER ETJV27ZK27AC T601 9HSTT2PC0KT021 TRANS POWER 7709 TU61 9HSTUNATSMS001 TUNER UNIT ENV56M07D8F X1301 9HSXC276LLN002 XTAL OSCILLATOR 27 00MHz 15PPM Ref No Mark Part No Description FUNCTION CBA IR SENSOR CBA JUNCTION A B CBA 9HS1ESA14395 LC 20AV7U FUNCTION CBA IR SEN...

Page 75: ...1107 A 9HSX1A7144 001 WIRE ASSEMBLY 4PIN SW 20V 4PIN 210MM CL1107 B 9HSX1A7140 001 WIRE ASSEMBLY 4PIN SW 20V 4PIN 128MM RV1142 9HSSESJRSKK057 SENSOR REMOTE RECEIVER KSM 603SR2E Ref No Mark Part No Description JUNCTION A CBA LC 20AV7U Ref No Mark Part No Description MISCELLANEOUS CL801 A 9HSX1A7140 007 WIRE ASSEMBLY 2PIN SPEAKER 20V 2PIN 230MM JUNCTION B CBA LC 20AV7U Ref No Mark Part No Descriptio...

Page 76: ...IGHT 2007 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher Mar 2007 Printed in USA ...

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