LCD screen backlight flickering

Yer bike busted? tell us all about it here.
MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Sep 18 2021 10:47pm

I need to fix this cut wire at the axle. I checked the wire and the small hall green wires insulation has peeled away substantially. It's about to touch the small black hall wire!!

I noticed that now there is an open throttle situation a lot. I'll turn the throttle and LET GO but it'll keep going by itself!!! Thankfully I have a brake sensor cut off. Maybe the throttle itself is causing this problem. It's coming off the handle bar! See the picture.

Should I even ride the bike? What's the worse thing that could happen if those wires touch? Should I just unplug the hall sensor and go sensor less until the part arrives? Could I potentially damage something here?

Any time I hit a big bump and the bike is running by itself , i.e. an open circuit, then suddenly it stops! Honestly seems like something is loose inside the LCD, or it's the axle wiring slash/cut/
Attachments
PXL_20210919_033539830.jpg
PXL_20210919_033539830.jpg (2.97 MiB) Viewed 825 times

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Sep 19 2021 8:33am

I would not ride with wires shorting out or throttle staying open. Sounds like some moisture issues. It seems lately that more and more members are having to dry out there components and reseal them.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Sep 19 2021 6:32pm

ZeroEm wrote:
Sep 19 2021 8:33am
I would not ride with wires shorting out or throttle staying open. Sounds like some moisture issues. It seems lately that more and more members are having to dry out there components and reseal them.
It could be, water could've to gotten inside the throttle, LCD, and maybe in the axle wiring.

A replacement throttle is on its way from Ali baba, takes a long time though.

Odd... It's so so dry here, i.e. zero humidity. It rained like a week ago, and before that six months ago.

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Sep 19 2021 7:16pm

Had taken that this started after a rain. Will reread your thread. Don't always have the focus I should have.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Sep 20 2021 4:09am

ZeroEm wrote:
Sep 19 2021 7:16pm
Had taken that this started after a rain. Will reread your thread. Don't always have the focus I should have.
It's ok. Any help is appreciated. :o

No this problem started in August and has gradually has gotten worse.

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Sep 20 2021 9:01am

Would find out home much power your allowed to pull thru the LCD and try to stick to that. Would think it's the LCD. Sometimes grounding is an issue. Make sure nothing is grounding to the frame. I'm at a loss if beyond that.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 02 2021 8:17pm

ZeroEm wrote:
Sep 20 2021 9:01am
Would find out home much power your allowed to pull thru the LCD and try to stick to that. Would think it's the LCD. Sometimes grounding is an issue. Make sure nothing is grounding to the frame. I'm at a loss if beyond that.
Zero, the LCD has a setting or 48 volts. My battery is 54.6 fully charged. Maybe that's why. The kit is designed for a 48 volt battery.

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 03 2021 7:48am

I would not focus on the Volts. You need to be in the correct voltage range, which seems you are.
Don't have any ideas at the moment. Hope someone chimes in. With a better idea.

Have running lights, and rear light. For the front bought a pair of motorcycle fog lights and using one at the moment. Don't think i'm using more that 3a. Could try to power it all thru the display, have chosen not to. Hooked up a Dc Dc converter to power it all. Even have a USB port I can add when needed.

Don't worry about the 48v that is just advertising. it's really a range 39v - 54.6v. Most things in this range are good up to 60v. This is only to guide a person. You need the spec's on a device to know for sure.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 03 2021 7:54am

Was going to mention about your batteries. Some batteries with a off switch. When charging even when switched off, will power up the BMS and LCD. This sounds like you connecting two batteries together. Some how it like turning on the switch.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 04 2021 5:01am

ZeroEm wrote:
Oct 03 2021 7:54am
Was going to mention about your batteries. Some batteries with a off switch. When charging even when switched off, will power up the BMS and LCD. This sounds like you connecting two batteries together. Some how it like turning on the switch.
Yeah there is an on off button on the LCD. But it is useless. All I need to do is plug in the battery and it's always live. The on/off just turns off the LCD. Except for day one of testing the kit! I couldn't figure out how to turn it on! I had to ask vendor to tell me how. Long press the M button! Now I know, but oddly every since there's always power to the motor no matter what.

I always unplug the two batteries and charge separately with two different chargers. I never charge in parallel to play it on the safe side.

I think something is loose inside the LCD. OH! also my open throttle/ run off bike stopped after I taped up the axle wiring. I think the pannier was hitting the axle wiring on big bumps and that wore a big hole in it. The big green phase wire was shorting onto the black hall sensor. It must've fried the LED screen back luminescence. Now it's just black and white. :x

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 04 2021 7:15am

by MarkJohnston » Oct 04 2021 5:01am

I think something is loose inside the LCD. OH! also my open throttle/ run off bike stopped after I taped up the axle wiring. I think the pannier was hitting the axle wiring on big bumps and that wore a big hole in it. The big green phase wire was shorting onto the black hall sensor. It must've fried the LED screen back luminescence. Now it's just black and white. :x
Axel wires and throttle having todo with each other. Don't see the connection. The LCD that makes sense. Hope it is now running ok now. Nothing like getting to know your e-bike.

Have two battery chargers for my e-trike. Decided to adjust them, both are set to high and always keep a close eye on the charging and cut it off. One charger is to use for regular charging to 80%. Opened it up and it would not adjust until I figured out was trying to adjust the wrong thing. Supposed to have one trim pot but my chargers have three. Now I need to figure out what I did to it. This charger was 1v higher so never have used it. I'm going to guess that what ever I adjusted was not set correctly to start with. Think it will be safe to use. Only going to 80% and trim pots are for fine tuning.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 14 2021 12:54am

Now some of the numbers are fading. It's starting to fail. Any recommendations for a new LCD? The controller requires an LCD.not sure if it has to be this one though

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 14 2021 12:16pm

The short answer is buy the same LCD and make sure the pinouts/cables are the same. Guessing and trying out wires are bad. Power to data cable could end the life of the LCD.

I'm no help with these. I know they are setup for specific controller. Helped my brother with his. Don't run them myself, Like the CA. Have found some threads on this one but don't seem very helpful. I will keep looking!
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 14 2021 10:12pm

"Product Information

Product name: LCD Control Panel
Color: Black
Material: LCD, Plastic
Voltage: 48V
Power: 1000W
Suitable for: Voilamart Electric Bicycle Conversion Kit"

Found a replacement, same thing,

I am putting 1200 watts through the whole system for LCD meant for 1000 watts. did I find the source of the problem?

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 14 2021 11:40pm

Would not focus on the watts. The controller is rated for amps.
The watts or amps do not go thru the LCD.
The LCD would be match to the controller and they would have a voltage range.
With motors it's the heat. The amps can melt wires if using to many.

Hoping some would chime in on your display. There are a few types that are common. I just don't know them.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 16 2021 12:21am

Can a tiny bit of corrosion on the wires cause this? I found a couple nicks in the insulation, and heat shrinked it up. It was the light with the thinly insulated wire

MarkJohnston   100 W

100 W
Posts: 104
Joined: Mar 25 2021 2:31am

Re: LCD screen backlight flickering

Post by MarkJohnston » Oct 16 2021 10:14pm

if my pin outs on my LCD plug leaving the controller match the CA pinouts perfectly, can I use the CA as a drop in replacement for my LCD?

User avatar
ZeroEm   10 MW

10 MW
Posts: 2002
Joined: May 03 2019 11:53am
Location: San Antonio, TX

Re: LCD screen backlight flickering

Post by ZeroEm » Oct 18 2021 8:29am

Short answer is I don't know. Some controllers are wired for the CA, if you have one of these then yes.

I would not think, the CA is not the same thing as a regular display. LCD's are built for specific controllers to to send signals to the controller to modify it's behavior. The CA only modifies the the throttle input to the controller, does not interact like an LCD for the controller.

You can check out the wiring pinouts from the CA guide. The CA only monitors how much power the controller is using, then modifies the throttle input. To hook one up all you need is to hook to the controller shunt or add one inline.
2019 Performer E-Trike
2013 Nissan Leaf S 7 bars 331.5w/KM

Post Reply