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Edward Baptist

ANSWERED Sondor Step Lost Power on Ride; won't charge

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I have a Sondors Step. This has about 250 miles on it. I ride in Hawaii. It's hilly and sometimes wet. I was riding to work (late) using pedal assist 5, the power cut out. I still had power to the LCD panel but the battery symbol was flashing on and off. I call my wife loaded the bike up and brought it home.  I removed the battery and looked at it. It displayed 3 green dots on the small battery panel and no red dot. I actualy have a second battery and tried that and I had the same issues - no pedal assist, LCD panel was on but the battery indicator flashed on and off. I disconnected each of the two brake lever connectors in turn to check if they were cutting power. Assuming I did this right, there didn't seem to be any difference. So what's my first step to troubleshoot? You're going to say to buy a multimeter, right?

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Well, a multimeter is how you, not only check the gas tank (battery level ie voltage), on your Sondors but it’s used to verify where the current is and isn’t to eliminate possible offending components, in the trouble shooting routine. Every owner should have one and learn how to use it. But let’s continue. You said no pedal assist but I’m thinking you mean the motor won’t power the bike with PAS or with throttle, is that correct? This probably isn’t the problem but make sure your PAS magnet wheel is touching the pickup sensor on the bottom bracket spindle (behind the Chainring on the right side pedal) , on it’s complete rotation. If it isn’t and is too far away, there won’t be pedal assist when you pedal but you’ll have throttle. If the magnet wheel is crooked, on the spindle and only coming close to the pickup throughout  part of its rotation, PAS will be intermittent but again the throttle will still power the bike. Verify you’ve checked this. 
Next unplug the LCD and replace the Higo connector cap on the controller side of the cable, it’s close to the handlebars by the LCD.  Go to 3:22 in the Video.   https://vimeo.com/349762157

If the bike now powers on and runs, the problem is the LCD. The fact that the battery power indicator is flashing, indicates a depleted battery. This is a process of elimination so it’s important to follow the procedures and act appropriately to obtain results only in leu of the preceding result . 

https://sondorsforum.com/topic/2051-2018-sondors-ebike-kd51c-lcd-setup-manual/

"◆Battery Indicator
The five battery bars represent the capacity of the battery. When the battery is in low
voltage, battery frame will flash to notice that the battery needs to be recharged immediately". 

5DBB4117-1D0D-4410-8129-5BC48C5475C6.thumb.jpeg.413e0f958bd62691d9676605d9ed4e23.jpeg
So that seems to indicate, since you have green LEDs on the battery itself, a discrepancy between the two readings, on the two components, battery & lcd. At this point, the LCD  KD51C is looking like the problem.  So replacing the saved Higo cap should restore power. Need a new cap? 


https://boltonebikes.com/collections/electrical-accessories/products/replacement-lcd-cap
If it does, try using a hair dryer on your LCD, warming it gently for 5 or so minutes and if that does not restore functionality, dry any remaining moisture that might be inside the LCD by placing it in a zip lock baggie overnight with uncooked rice, and try again. That will draw moisture to the rice.
In your title you say "Won’t Charge" but you don’t mention that in the body of the text. If you’re using the correct procedure to charge your batteries by making sure your battery switch is off and connecting the charger to the battery before plugging the power cord to the wall outlet. The light on the charger should be momentarily green then red until the battery is fully charged then change to green.   https://vimeo.com/354146189

If your charger is the problem you’ll need the multimeter to check the output to verify.


      LEMMENO. 
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          REDDY  

 

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The Youtube videos you cited in you reply post are for a different model Sondors. I have a Sondors Step. No idea where the controller is even located, so I can’t replace that little Higo connector thing you linked me to. If you could clear that up for me, I’ll order another Higo and replace the old one. 
 

Assuming the culprit might be the LCD/Throttle assembly, I removed them, heated the up with the hairdryer and stuck them deep in a bag of rice a day or so. I’ll let you know if that alone got me anywhere. 

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Here is the best Sondors Smart Step Information. Please review all portions that you are unfamiliar with.  Sometimes just charging the battery in the correct procedure can solve problems. 
https://shop.sondors.com/pages/assembly#step

I now believe that your Sondors Smart Step requires the service of an on-site eBike Technician. I’m unfamiliar with the eBike stores offering service that are available in your location. Please find one and take your bike, extra battery and charger there for assistance.
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REDDY


 

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Hey. So, I looked up the LCD manual online. My bike didn’t ship with a manual, but I found a manual for just the controller/LCD. After sorting out some obvious typographical errors, I put in the default code for factory settings and reset the darn thing.  The first rule of using digital electronic systems -  When in doubt, reboot. Problem solved.

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The manual is online here on this forum.  Sondors does not ship the LCD manual because any changes to the Sondors eBikes that are a result of information they supplied, that caused any mishap or injury could make the company responsible ...so you're at your own risk here. The fact that restoring factory reset cleared up your multiple problems had to be the result of SOMEONE changing the original factory settings. Would have made trouble shooting your problem a lot easier  if you had mentioned you had. But then again ,I just figure it’s the devil’s work. )) 
FA7A23E0-74C1-4EF0-8B8C-C24323DEFC9C.jpeg.2346c8a9b61b7fbf10ea6fde6a79d74c.jpeg
             REDDY

 

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