So, I have this Electrolux vacuum which had the batteries revently replaced and now it won't work.
The voltage from the batteries is arriving to the board without problem (+/- 12v) @ CN4 & CN6.
The motor works fine when voltage is applied to FM+1 & FM-1. The switching on and off is made in the negative line between CN6 and FM-1, and all components have been tested as fine apart from a FET.
The problem appears to be that the PHD71NQ FET (Q18) isn't switching when the power button is pressed.
I say this as when I started to connect my component tester to this FET, the motor fired up.
The exact situation was that one clip was on the Gate, and when the second pin was touched to the Drain, then the motor kicked in, nothing was connected to the Source.
Should also mention that there is the 12v on both the Gate and Source pins at all times. Drain connects via a couple of inductors (L5 & L6) to the motor supply.
I don't have the most experience with FETs but seems to me that I need to test the FET out of circuit and work my way back to the power switch if it tests bad.
Does that sound about right?
The voltage from the batteries is arriving to the board without problem (+/- 12v) @ CN4 & CN6.
The motor works fine when voltage is applied to FM+1 & FM-1. The switching on and off is made in the negative line between CN6 and FM-1, and all components have been tested as fine apart from a FET.
The problem appears to be that the PHD71NQ FET (Q18) isn't switching when the power button is pressed.
I say this as when I started to connect my component tester to this FET, the motor fired up.
The exact situation was that one clip was on the Gate, and when the second pin was touched to the Drain, then the motor kicked in, nothing was connected to the Source.
Should also mention that there is the 12v on both the Gate and Source pins at all times. Drain connects via a couple of inductors (L5 & L6) to the motor supply.
I don't have the most experience with FETs but seems to me that I need to test the FET out of circuit and work my way back to the power switch if it tests bad.
Does that sound about right?
Comment