Burned parts in power invertor Whitenergy

[MartinJ]

Hi to everybody!

I am trying to repair power invertor Whitenergy AC/DC from 24V to 230V 2000W. On the PCB I have found that there are two parts burned out. On the PCB there is a resistor marking R59, R60. But only leads are sticking out on the PCB and it can not be seen what parts used to be there.

I guess these parts might be resistors with some small value (less then 1ohm). But I am not sure. They are in series with the load (230V socket) in the H-Bridge circuit.

I have searched on the internet for the possible part which can be there. It seams that there can be also some filters or inductors. But I am not sure.

Does anyone have an idea what is the best to put there? Attached are some pictures to describe the problem.

Thanks Martin

[MartinJ]

Hi there,

problem solved. Part that was burned was pozistor - fuse. With increasing current (temperature) increases its resistance and limits the output current. The invertor was probably used for very high load for long period of time and this part was burned by long term high temperature.

Martin