Fried DA Di2
Moderator: robbosmans
Hi,
Here I've got a bike with DuraAce Di2 with custom battery which has been connected with reversed polarity. Di2 dead.
Now I want to check the damage. The junction box seems ok since it flashes the LEDs (and reports a system error).
Both deraileurs dont work.
I plan to unmount the deraileurs from the bike and put them on another Di2 bike to see if the deraileurs work.
My question is if this is a safe thing to do or there is any risk of damaging the working Di2 on another bike if I connect the fried deraileur on it?
I'm pretty sure that the FD is fried because it gets warm if I connect it to the battery.
Any thoughts would be welcome.
Regards
Here I've got a bike with DuraAce Di2 with custom battery which has been connected with reversed polarity. Di2 dead.
Now I want to check the damage. The junction box seems ok since it flashes the LEDs (and reports a system error).
Both deraileurs dont work.
I plan to unmount the deraileurs from the bike and put them on another Di2 bike to see if the deraileurs work.
My question is if this is a safe thing to do or there is any risk of damaging the working Di2 on another bike if I connect the fried deraileur on it?
I'm pretty sure that the FD is fried because it gets warm if I connect it to the battery.
Any thoughts would be welcome.
Regards
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It should be safe because RD and FD only carry out instructions received from the shifters and they send any power to the system as the battery does.
Try the RD on another bike first, if it works, try the FD next. I think you're right that the problem is in the FD.
Try the RD on another bike first, if it works, try the FD next. I think you're right that the problem is in the FD.
Cannondale SystemSix R8170
Trek Checkpoint SL5 MY2022
Trek Checkpoint SL5 MY2022
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Power is always delivered from the battery. Shifters just communicate with the microcontroller. Take it to a shop with the di2 diagnostic kit and they can diagnose it.
- HammerTime2
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And this is the DITY2* groupset**In German Technology (Shimano Electronic/Aero integration), LegalizeMyCAAD9 wrote:If the official Shimano electronic is Di2, then this is the DIY2 groupset
* Do it to yourself
** Perhaps WW shows a biased sample of do it yourself projects or modifications in which the results are favorable, as those with unfavorable experiences are less likely to post about them, whether through embarrassment or having crashed and not being around to post. Failures are often more instructive than successes.
Well, this one is a definite FAIL. But this is a fail because the manufacturer of the baterry has reversed the wires in the originally suplied connector. See pic.
https://picasaweb.google.com/1002564760 ... 5715680002
So, if somebody is going to play with custom bateries remember : DO NOT REVERSE THE POLARITY, there is NO PROTECTION on the Di2.
https://picasaweb.google.com/1002564760 ... 5715680002
So, if somebody is going to play with custom bateries remember : DO NOT REVERSE THE POLARITY, there is NO PROTECTION on the Di2.
I'm not completely certain if it also works with reverse polarity but I allready experienced that di2 has a crash mode that puts the front and rear mech out of order.
You'll need a shimano device to reset both to normal working order (off course this will only work if nothing is damaged).
(I hooked both front and rear mech to another di-2 bike and this does also do the trick).
You'll need a shimano device to reset both to normal working order (off course this will only work if nothing is damaged).
(I hooked both front and rear mech to another di-2 bike and this does also do the trick).
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threads like this remind me why I like simple bikes
Man I know little to nothing about Di2 and ESP other than having ridden both of them. That being said, I love my mechanical set up if only for that reason alone! Don't get me wrong, if I had the money, I would have ESP (as well as a mechanical SR set up as well!).
Cannondale Synapse (alu)...it works
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