Help! kt36/48svprm ffF10L & KT LCD8HU turns on and then off

[pataties]

Hi all!

Finally it's christmas, which means I have time to do a battery controller upgrade for my super 73 Z1.
I did this before on my previous Z1 and normally it's a easy job:
- Replace battery (to a 48v one in this case)
- Replace controller (kt36/48svprm ffF10L )
- Apply WP plug and cable (comes with the controller)
- Connect the lcd (LCD8HU), pas sensor, brake cutters

I bought all this components new.

BUT this time something strange is happening.
When I go to turn the bike on (batteries all charged) I press the power on button and the display comes on. However as soon as I remove my finger it goes straight off again.

I checked the following things to close out any failures:

- Battery voltage is correct (checked with quality multimeter)
- LCD screen is connected correctly by the juliet connector
- Replaced the t60 connector on the controller

I think my controller is faulty but maybe I'm overlooking something.


Merry Christmas you all!

 

[Nealh]

Could be the lcd not latching and staying on ?
Have you other kt lcd's you an try to see if they will work ?

 

[pataties]

Hi Nealh,

Thank you for the reply. How can I check this? I know the blue wire is the one for latching. Unfortunately I don't have a spare kt lcd. But the lcd was working on my old kt controller which was i think burned (only the screen worked but no power)

I also saw this thread: https://www.pedelecs.co.uk/forum/threads/kt-lcd5-turns-on-and-then-straight-off.42388/

But could't find out what the final solution was.

Cheers