wrote in message
...
On Mar 26, 3:51 pm, "tm" wrote:
"Bimmer Owner" wrote in message

...





On Tue, 26 Mar 2013 14:56:21 -0400, tm wrote:

Any evidence it was checked with a scope?

Yes.

This quote below is verbatim from this location:
http://www.bimmerfest.com/forums/sho...&postcount=131

Quote:

Originally Posted by olivier577 Hi, After soldering the lost/refound component, remaking the joints of the 2 mosfet and testing the FSU alone with an oscilloscope, here are my observations:

Quote:

Originally Posted by olivier577 - the FSU works again - there is no PWM , the gates signals are continuous voltage only , this is the reason why it heat so much its aluminium box... In fact there is no point on the board where square signals are present. Can somebody check its own FSU if it's the same ? - the 2 bridges are in fact 2 resistors 10 milliohm used to balance the currents between the 2 MOSFET and balance the power also. The mesure of the DC voltage on those resistors can be used to evaluate the current of the blower and its worn state. - I guess the principal duty of the computer on the other side is switching off the power transistors if the control voltage goes under 1V. I put the FSU back in the car and it still work, I don't know if it will last long. because of the heat... Olivier

http://www.bimmerfest.com/forums/att...entid=306784&d...

Ok, they are most likely transistors and the two straps are combining the
emitters. Is the center junction of the two straps connected to the motor?

Does the red jumper connect to the 40 amp fuse? If both of those are a
yes,
then they are most likely NPN power transistors and the jumper ties the
collectors together. Or power darlingtons. And it is just a linear supply.

In your other pictures, the spring clips just hold the transistors against
the heat sink.- Hide quoted text -

- Show quoted text -

The main points of his post, like the "two bridges that are .01 ohm
resistors, that "balance" the motor don't
concern you in the least?

Blind leading the blind
=============================================

It is common to place low value resistors in the emitters to balance the
current in two paralleled devices.
0.01 ohms would be very realistic in a 40 amp system.

As to blind, you exhibit that trait much better than anyone else involved
with this thread.
Asshole.