New SW102 display not turning on with used TSDZ2 motor

Joined
Sep 30, 2022
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Hi dear diy'ers,
I was recently intrigued by this e-bike thing so I wanted to try building my own on the cheap, after prolonged searching I bought an used TSDZ2 48V 750W motor in good shape for reasonable price (more about the motor later), new 720Wh 48V battery and new SW102 display. After receiving everything I proceeded to test bench the system, after making my own cable extenders for the display, checking all connections and voltages I proceeded to power up the motor and SW102 display from the battery and... nothing worked.
Absolutely nothing happened, the display did not boot, nothing was heating up, no magic smoke or no weird electronic smell was released.
That's disappointing I thought and rechecked every connection and signals I could and everything seemed fine, yet nothing seemed to work.
After more measuring and trying different connections I gave up on current display and requested a new SW102 display from the seller, thinking that current one was busted.
The replacement SW102 arrived today and after rechecking my connections and trying it again, boy was I disappointed because nothing worked yet again, however it did heat up slightly.
After that occurrence I opened up the previous display that I got and tried to flash a new software (as described here: https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki/Open-SW102-by-cutting-a-side-part-and-solder-SWD-wires), but it seems that the display was shorted bc my St-link was not detected and LED on it did not lit up (worked fine after disconnecting SW102).

The seller of the TSDZ2 motor said that he flashed an Casainho's TSDZ2-Smart-EBike software, and I used SW102 with og rom on it I know that the controller is expecting an specific software on SW102 but I was hoping that after connecting everything I would at least see an boot up screen.

As for the behaviour that the motor showed:
-Manually turning crankshaft -> nothing
-While connected to the battery -> brake reading 0V, P+ 52V
Regarding behaviour while connecting jumper wire to Vin and something, I cannot provide accurate results now as I forgot what they were, bc I was measuring that 2 weeks ago but I am certain that the results were up to specifications and that brake was reading 5V as it should.

I will try to flash a new version of Casainho's or Emmebrusa's software to TSDZ2 tomorrow.

Some additional info:
How I wired an SW102 display to TSDZ2 motor: https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki/wire-display
color in extension cable = TSZD2 pin out = color of cables on the display side
green = P+ = red(+36)
green-white = GND = black
brown = tx = green
orange = rx = yellow
blue = Vin = control, blue
blue-white = Brake = XXX (not connected)
Casainho's software: https://github.com/OpenSourceEBike/TSDZ2-Smart-EBike
Emmebrusa's software: https://github.com/emmebrusa/TSDZ2-Smart-EBike-1
Flash the bootloader and firmware on SW102 using SWD: https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki/Flash-the-bootloader-and-firmware-on-SW102-using-SWD

I also attached an SW102 manual in which you can find pin layout at the end of the document and the photo from the net that confirms info from the manual (I found several more but this one seems like the most readable)

Thank you for reading my lengthy cry for help on this forum. Right now I have no idea what is wrong, I ran out of ideas for solutions or causes for my problems. I hope that I can at least salvage either which of displays and that my controller isn't busted (as it shows signs of life, however I couldn't find any way of driving a motor without display). I will be grateful for any suggestions and solutions.

I hope I didn't broke any rules as I am new here and that I included as much information as I could, if I made any mistakes please don't hesitate to correct me.
 

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wm25burke said:
however it did heat up slightly.
In this case I meant that the SW102 display did heat up slightly after connecting everything to the battery, I haven't noticed any changes in motor temperature or any movement. When I opened the motor last time I haven't noticed anything out of the ordinary, although it might be worth opening it again in the morning to check.
Thx for replay and sorry for not clarifying my self in the original post.
 
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