Dyson DC45 trigger board burnt brush motor driving SO8 IC

[martonmiklos]

Hi fellows,

I am trying to repair a Dyson DC45 battery powered hoover.

There is a trigger board in it which hosts an Attiny48 and some power stage to drive the brush motor.


Unfortunately a SO8 component burned to hell in it together with a 0603 resistor and the IC could not be identified.

The Attiny output looks to be survived the problem because when pulling the trigger it outputs high for a while and then turns off.
It is likely that it measured the current on the R10 shunt and this is why it is shut down.

I have attached a reverse engineered schematic from the part.


What type of IC could it be?

[R_J]

Use some alcohol to clean the top of Q2 and you will see the number, I suspect it is a mosfet or mosfet and diode. pin 1 is under the white wire next to the notch on the ic.
It may be a FDFS6N548

[martonmiklos]

The pinout in the schematic could be mirrored (I have not managed to find pin #1 marking on the board or on the IC.)

[R_J]

Use some alcohol to clean the top of Q2 and you will see the number, I suspect it is a mosfet or mosfet and diode. pin 1 is under the white wire next to the notch on the ic.
It may be a FDFS6N548

[stj]

pin1 faces the inductor, the package outline on the board shows the top

[martonmiklos]

Use some alcohol to clean the top of Q2 and you will see the number, I suspect it is a mosfet or mosfet and diode. pin 1 is under the white wire next to the notch on the ic.
It may be a FDFS6N548

Thanks man it matches the pinout I will ditch in a diode and an N FET and we will see!