Faulty treadmill control board

[sgtlard]

OK. reading A. : 0.2. reading B : 1.9. thus true value : 1.7

DMM set to Ohms, 200 ( lowest setting )

 

[tt1987]

Did you check whether the DC power supply is stable?

 

[sgtlard]

Did you check whether the DC power supply is stable?

I don’t get a reading for long enough from the pins for the motor

The elevation motor works fine, as do other aspects. I could check those pins assuming it’s dc

Any attempt to start the treadmill motor, stops instantly.

where would I measure

 

[Mehdi Bouaziz]

Hello Sgtlard,

I have the same issue on my treadmill, check the mosfet transistor on the board.

 

[sgtlard]

Hello

yes, that mofset is faulty. ( tone’s out any way it’s connected. )

replaced with another - died immediately. I assumed it was the board.

replaced the board and it was fine - for about a month. It failed while daughter was walking on it. E1

same tone out on the same mofset.

need to replace it again - struggling to quite match up the replacement part when searching

I have read that the treadmill belt might be a cause - I’ve never lubriacated it, and it’s 10+ yes old. I have very thoroughly lubricated before installing the new board and it seemed ok but has failed as described above

any ideas on the right part?

 

[sgtlard]

Struggling to locate the right replacement part for the IGBT

G40N60 UFD

could someone confirm which version is right/best replacement?

thank you

 

[Harald Kapp]

The G40N60 UFD is good for 160 W. But it seems the UFD is no longer available (at least not through reliable channels).

Mouser lists HGTG40N60B3 and HGTG40N60A4.
Comparison shows that the A4 type is good for 75 A vs. the B3 type for only 70 A.
Max. power dissipation is 625 W vs. 290 W.
My guess is that you fare better with the A4 type, but the B3 type should work, too. Note that you will probably need good heatsinking. Don't forget the thermal grease between transistor and heatsink to improve transfer of thermal energy.