Go Back  Bike Forums > Bike Forums > Electronics, Lighting, & Gadgets
Reload this Page >

Wahoo Kickr Circuit Board Repair

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

Wahoo Kickr Circuit Board Repair

Old 03-14-19, 02:17 PM
  #1  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wahoo Kickr Circuit Board Repair

I have a Wahoo Kickr with a damaged circuit board. Only one part is damaged and I could replace it if I knew the part number, but the markings on the part (that tell you the part number) were also damaged. If I had a hi-res picture of the circuit board from a working unit, I could recover the part number, buy it and repair the circuit board. Of course, I realize one would have to disassemble their unit sufficiently to access the circuit board to take a picture. But it is just a few fasteners that use standard hand tools. The picture would need to be clear enough to read all of the markings on the specific part. The part in question is marked Q1 in white text on the circuit board. Any help is much appreciated. Thank you.
kevin999 is offline  
Old 03-14-19, 06:09 PM
  #2  
steelbikeguy
Senior Member
 
steelbikeguy's Avatar
 
Join Date: Feb 2008
Location: Peoria, IL
Posts: 1,596
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 503 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
if you have a picture, maybe you could PM it to me and I could post it? I'm kinda curious myself.

In general, though, parts are so small that there is very little marking on them. Generally, there are 3 characters on SOT-23 components that are typical of transistors. Here's a shot of the circuit board from a B&M Eyc light....




Steve in Peoria
steelbikeguy is offline  
Old 03-18-19, 08:34 AM
  #3  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hi Steve,

Apparently I can't do PMs yet until I get more posts. Thanks for your effort. My circuit board is different than the one you shared. Once my account gets to 10 posts (allowing me to post pictures and PM folks), I will update this thread so you can see what I am talking about.

Kevin
kevin999 is offline  
Old 03-18-19, 09:10 AM
  #4  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 18 Times in 18 Posts
if the picture is online (flickr, etc) leave a visitor message on my profile with the link and I'll post it
unterhausen is offline  
Old 03-18-19, 09:48 AM
  #5  
steelbikeguy
Senior Member
 
steelbikeguy's Avatar
 
Join Date: Feb 2008
Location: Peoria, IL
Posts: 1,596
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 503 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by kevin999 View Post
Hi Steve,

Apparently I can't do PMs yet until I get more posts. Thanks for your effort. My circuit board is different than the one you shared. Once my account gets to 10 posts (allowing me to post pictures and PM folks), I will update this thread so you can see what I am talking about.

Kevin
maybe a link to the photo? (I'm not familiar with what is allowed for new members....)
Or just keep chatting until you get to 10 messages... So how's the weather?
or discuss how you have decided that a transistor is bad?

Steve in Peoria
steelbikeguy is offline  
Old 03-18-19, 07:08 PM
  #6  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 18 Times in 18 Posts
if he has a link and saw my post, we will get the picture posted for him.
unterhausen is offline  
Old 03-19-19, 10:12 AM
  #7  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I can't even post a URL until I have more posts.
kevin999 is offline  
Old 03-19-19, 10:13 AM
  #8  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
So I am trying to get more posts.
kevin999 is offline  
Old 03-19-19, 10:13 AM
  #9  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The weather in northern california was been super wet and rainy. Now, after the clock-change, our local race ride starting up again.
kevin999 is offline  
Old 03-19-19, 10:14 AM
  #10  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
But the WAZE apps are re-routing freeway traffic onto our country roads. So we have to change our route.
kevin999 is offline  
Old 03-19-19, 10:15 AM
  #11  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
To add a bit more information, the trainer is the normal KICKR model from 2016.
kevin999 is offline  
Old 03-19-19, 03:53 PM
  #12  
steelbikeguy
Senior Member
 
steelbikeguy's Avatar
 
Join Date: Feb 2008
Location: Peoria, IL
Posts: 1,596
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 503 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by kevin999 View Post
The weather in northern california was been super wet and rainy. Now, after the clock-change, our local race ride starting up again.
isn't "wet" somewhat normal for northern California? I've only been in the area once, though, and that was in the summer. Very nice!

Steve in Peoria
(not a very wet winter/spring so far, which is fine with me)
steelbikeguy is offline  
Old 03-19-19, 03:58 PM
  #13  
steelbikeguy
Senior Member
 
steelbikeguy's Avatar
 
Join Date: Feb 2008
Location: Peoria, IL
Posts: 1,596
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 503 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by kevin999 View Post
But the WAZE apps are re-routing freeway traffic onto our country roads. So we have to change our route.
A couple of decades ago, I lived in the St. Louis area. Traffic was mostly on the interstates, and could be fairly miserable if you were going in the wrong direction at the wrong time of day.
I was down there recently and went for a ride on my old favorite roads in the afternoon... and it was a mess! Traffic had migrated onto these formerly pleasant roads and turned them into slow moving parking lots. Another reason that I'm glad that I left there. (but there is still some fine bike riding in the outer St. Louis areas, especially out west)

Steve in Peoria
(very much enjoying riding in the low traffic in Peoria as well as the vast expanses of rural areas surrounding it)
steelbikeguy is offline  
Old 03-20-19, 03:09 PM
  #14  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Okay, back at it. I could only make 5 posts in 24 hours.

Yeah, "wet" is supposed to be the norm in Northern California this time of year. But it increasingly seems like there is no norm any more. 5 out of the last 6 years have been drought years, but then this February was one of the wettest Februaries on record.
kevin999 is offline  
Old 03-20-19, 03:10 PM
  #15  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Sorry to hear that the traffic apps have messed up the nice quite roads in other places. It really is disappointing.
kevin999 is offline  
Old 03-20-19, 03:17 PM
  #16  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Last post of my probation.
kevin999 is offline  
Old 03-20-19, 03:19 PM
  #17  
kevin999
Junior Member
Thread Starter
 
Join Date: Feb 2017
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Okay, at long last. Here is the picture of the circuit board. The part in question is bottom middle, labelled Q1, with the red box drawn around it.


kevin999 is offline  
Old 03-20-19, 05:55 PM
  #18  
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 18,102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 18 Times in 18 Posts
I probably have the same trainer, can you take a picture of what I have to take off? Looks like that might be part of the braking circuit, which suggests a power transistor
unterhausen is offline  
Old 03-20-19, 06:10 PM
  #19  
steelbikeguy
Senior Member
 
steelbikeguy's Avatar
 
Join Date: Feb 2008
Location: Peoria, IL
Posts: 1,596
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 503 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by kevin999 View Post
Okay, at long last. Here is the picture of the circuit board. The part in question is bottom middle, labelled Q1, with the red box drawn around it.

well, I can see why you thought Q1 might be bad!
what the heck happened to it, though? There's no sign of overheating, which is usually why chunks of the package get blown off.

Based on what I can see of the circuit board traces, my first thought was that Q1 was used to prevent reverse application of power from the connector on the right. However, the source and drain should be connected opposite of what they are, so that idea is out.

The next (last?) idea is that it might be a N channel mosfet (or npn transistor) switching a high side load. I think the diode, D1, is meant to be a freewheeling diode to handle inductive kickback. That load would be whatever hooks up to the two-pin connector on the left......



so what connects to that??
Whatever it is, that should be the only part that isn't working.

and just out of curiosity.... what does this gadget do? There's almost nothing on it other than the bluetooth radio mondule.
edit: the internet tells me that this is for an indoor trainer, so I'm guessing that the "brake" is somehow controlling an eddy current brake that acts as the drag for the trainer. It's probably an inductive load, and probably pwm'ed, so the flyback (or freewheeling) diode is important. It might be important for the mosfet to have a low Rds to avoid overheating, in the event that it is carrying much current.

anyway... my guess is that this is a N channel mosfet from On Semi (formerly part of Motorola). The code on the package is mostly just telling when and where it was made. The actual device info is probably on the part of the package that's missing.
Here's a datasheet for a somewhat similar mosfet from On Semi..
https://www.onsemi.com/pub/Collateral/NTD3055-150-D.PDF
The package is a D-PAK, and any logic level N channel mosfet is probably okay.

Anyway.. that's my guess. Looking forward to finding out what I overlooked.

Steve in Peoria

Last edited by steelbikeguy; 03-20-19 at 06:23 PM.
steelbikeguy is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.