Samsung samsung bn44-00121j power supply sch free download

File name samsung_bn44-00121j_power_supply_sch.pdf

7 Block Diagrams 7-3 IP Board Part (SMPS Part) 7-3 7 Block Diagrams 7-4 IP Board Part (Inverter Part) 7-4 13 Circuit Descriptions 13-1-3 IP BOARD BLOCK(POWER) Parts 13-1-4 IP BOARD BLOCK( INVERTER ) Parts 13-3 13 Circuit Descriptions 13-1-5 IP BOARD(inverter) PROTECTION Parts PROTECTION Parts - PROTECTION Parts are divided two parts. When lamp voltage rose as absurd and lamp feedback electric current would not be sensed. So all of the two halt IP-Board's function that prevent action the enemy more than IP-Board's continous abnormality action. - When Trans output voltage rose as absurd, become OVP and halts IP-board's function because the divided voltage is inputted by IC(U201) 2 PIN. - When lamp current is sensed, become OLP and halts IC because the IC(U201) 2 PIN is became under 2.5V 13-4 13 Circuit Descriptions 13-2 Trouble Shooting 13-2-1 IP BOARD(Power) Power On No Check Fuse (F101) Yes Change FUSE IC101 Vst-Pin No (Norma:High) No Check the short of AC part or Check the IC Yes IC101 D-pin IC101 Vcc-Pin No (Normal:9~16V) No Check the 13V output part Check the Vcc part open Yes IC101 D-Pin (Normal:Switching) No Yes Check the Switching part Output 13V No (Normal:12~14V) No Check the protection system Yes Check the feedback system Inlet/Output Harness No Yes Check the Pin or wire connection Check others Harness, Inlet