Thanks in advance for any help or suggestions.

I am an auto tech by trade and so have replaced a lot of electronic parts and some basic pcb solder repairs but a noob when it comes to electronics repair.

I have an Alliance 880hr treadmill which is a Keys model EC880
I have diagnosed the problem to be in the control board ... specifically the power supply to the DC motor.
I have posted pics and pointed to a chip on the back of the board that seems to be damaged 'a chip with a chip'
I don't know if this could be the problem or if and how to check this or other parts.

Replacing the control board with something that will give me just the basics ...adjustable speed motor would also be an option.....I don't care about the elevation motor or the other bells and whistles.

 

looking at the pcb, the chip that has blown is a surface mount type, its possible the psu is at fault,there is another chip next to it, can you take closer pictures of them.

 

Thanks Dodgydave
Let me know if this pic shows what you wanted to see

 

I think repairing this control board is going to be beyond my ability...so I'm looking at an inexpensive alternative.
I would be content to use this as a basic treadmill with no incline or console controls and saw this on eBay

http://www.ebay.com/itm/Input-AC110V-Output-DC0-90V-Motor-Speed-Controller-120W-/160524245706

Would this work to power and control my DC motor?

 

Any of the DC motor controllers on ebay such as made by KB & Baldor would work, the problem comes if the original has a motor tach feedback to the board?
Also the speed control input on many TM's is PWM control and the ones on ebay are mostly 0-10vdc analogue.
I have Keys TM and the motor has a optical tach.
Max.

 

Thanks Max
My motor also has the optical feedback but I thought I would eliminate the board completely and just use the DC motor controller. Would you see any issues with that.....also is there a specific DC controller you would recommend for this.?
Thanks, Mike

 

The problem going without the tach feedback with this application will be the lack of consistent rpm control WRT load.
The KB series offer SCR bridge and PWM types with the PWM being quieter and smoother control, you can get an idea of the models from the KB web site, they frequently come up on ebay.
Max.