Sharp LC-20AV7U Service Manual - Page 33

Power Supply Block Diagram NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD. 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. 4A/125V CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse. ATTENTION : Utiliser un fusible de rechange de même type de 4A, 125V. NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal. 8-6 AC601 AC CORD HOT CIRCUIT. BE CAREFUL. 4A/125V F601 4A/125V L601 LINE FILTER HOT D605 - D608 BRIDGE RECTIFIER T601 2 COLD 9 15 13 4 16 Q601 SWITCHING Q603 SWITCHING CONTROL 10 7 12 6 11 14 4 1 IC601 ERROR VOLTAGE DET 3 2 Q913 FEED BACK MAIN CBA Q402 SWITCHING Q403 SWITCHING Q908 SW+3.3V INV+22V BACKLIGHT-SW TO LCD BACKLIGHT BLOCK DIAGRAM TO SYSTEM CONTROL BLOCK DIAGRAM D923 SHUNT REG. Q909 SW+2.5V D924 SHUNT REG. Q902 SW+3.3V D920 SHUNT REG. CN62 CN102 4 DTV-ON+3.3V 4 DTV-ON+3.3V 5 DTV-ON+2.5V 5 DTV-ON+2.5V 6 DTV-ON+1.8V 6 DTV-ON+1.8V CN61 CN101 3 DTV-ON+5V 3 DTV-ON+5V DTV MODULE CBA UNIT IC901 +1.2V REG. AL+1.2V(D) AL+3.3V(D) Q901 SW+3.3V AL+3.3V(A) IC905 +5V REG. IC904 +1.8V REG. Q905 SW+6.5V Q906 SWITCHING Q923 SW+12V Q1002 SWITCHING Q1001 SWITCHING Q916 SWITCHING Q907 SW+5V Q918 SW+9V D916 SHUNT REG. Q903 SW+5V P-ON+9V P-ON+5V(1) +12V +10.8V REG. Q1003 D1002 SHUNT REG. Q1005 SW+25V Q1004 SWITCHING Q1006 SW-6V Q910 SW+3.3V VGH-H TO SYSTEM CONTROL BLOCK DIAGRAM +35V VT+33V Q919 SWITCHING DTV-ON-H P-ON-H TO SYSTEM CONTROL BLOCK DIAGRAM CN1202 2 PANEL+25V 3 PANEL+25V 5 PANEL+3.3V 6 PANEL+3.3V 8 PANEL+10.8V 10 PANEL-6V TO LCD MODULE A7144BLP