aslam o alaikum This is gold star ups inverter which is showing fault 3 today we will learn how to fix repair fault 3 ?. not just Gold star likewise you can fix fault 3 in adoration inverter this behavior. let’s start chiefly fault 3 was used in ups due to short circuit in production movement of blame 3 can be damage in DC to AC converter part or can be damage in DC to DC converter slouse this is DC to DC converter area DC to DC converter slouse converts DC 12 volts to 310 volts DC 310 volts DC are supermarkets in this capacitor now DC to AC converter proselytizes 310 volts DC into 220 volts AC DC to AC converter slouse can also be mar. due to that fault 3 can be appeared if we look carefully there is no component seems to bad we can see in PCB backside in DC to DC converter section here are some boundaries detriment we research mosfet’s with multimeter these mosfet’s are bad you should check resistors connected with mosfet’s GATE.If spotcheck bad resistors satisfy supersede you must replace ic sg3 525. it will save your precise day beep beep beep beep beep you should check resistors connected with mosfet’s GATE. if detect bad resistors delight change you must replace ic sg3 525. it will save your precise era After substitution of irf3 205 with gate resistors along with sg3 525 now it is time to check Dc to Ac converter section if encounter any mosfet shattered supplant that mosfet with new one. i detected two mosfet’s bad in DC to AC converter i supplanted Remember if you find mosfet BAD in DC to AC converter then you should check SMD resistor is linked to mosfet gate if you find any resistor bad then check SMD transistor and supersede otherwise all replaced factors can be damaged if you perceived this video beneficial then satisfy like it and share with friends and don’t forget to Subscribe my canal you should check charging division mosfet in this ups blaming mosfet’s was ok if you find bad then please supersede now BAD areas has been replaced let’s experiment ups after connecting it with artillery look ups has started operation and at this time i have connected 200 watt bulb in output of ups now we have connected ups with mains now it is charging