Hi guys right now i am working on a 150w inverter it has plug for the car lighter and when i conect 12 volts to it the beeper beeps continously with a short delay and the green led blinks every time it beeps so i removed the mosfets 4 irf740 and 2 fqp50n06 to chek them with my multimeter so two of the irf740 were bad and one from the fqp50n06.
I replaced them and the same problem begans but now the led is not blinking and the beeping doesn't have delay.
So can anyone please help to fix this inverter.
Thanks Dzoro

 

And also in it it has two IC's one is quad op amp lm324 and tho other one is ic that i see in every atx psu it is tl494

 

The forum's crystal ball is unavailable. Without a schematic there's not much chance of anyone being able to make helpful suggestions.

 

The forum's crystal ball is unavailable. Without a schematic there's not much chance of anyone being able to make helpful suggestions.

I will try to find it on the internet an i'l send it