DC motor position control

Hi I really need advice/help!!

I have a OEM satnav screen im trying to use in a car pc setup. The monitor opens and shuts automatically on recieving a power signal and also on a button push.

The motor is DC with a gear on the shaft going to a pot.

It was working but the oem boards have been broken by myself (foil ribbon cable linking two pcbs has 4 tracks torn) the potentiometer fell apart and I think a component like an inductor is damaged on the board....

so I am wondering if I can make my own system on some verro/copper board but havent a clue where to start...I did GCSE Electronics and A-Level but don't know any circuits which would help me :-(

I am in your hands people!

Karl

Some pictures would help a lot, as I need to see to make any opinions.

Hey sure sorry about that. I managed to fix the ribbon cable but have an issue with a pot I believe...

should a pot be able to spin around and around with no "stops"??

karlb123 said:

Hey sure sorry about that. I managed to fix the ribbon cable but have an issue with a pot I believe...

should a pot be able to spin around and around with no "stops"??

Click to expand...

Pots do not spin with out stops.
I did find one that will but it is hard to find, and hard to pay for.
There are shaft encoders that look like a pot but are not.

View attachment 62939

Its made by ALPS but thats all I can deduce.

I think I broke the pot...it just fell apart you see and when I manually turned the motor shaft it would lock like as if at the end of the pot.... and vica versa..

Now I see the picture.
So there is some electronics that sits under a gear.
Do you think the gear should turn more than 3/4 of a turn under normal conditions?
Does it act like a pot? Can you measure the resistance on the three wires as you turn the gear?
It might be a shaft encoder that opens/ closes contacts every turn or (every 1/16 of a turn).

View attachment 62940
This is whats under the gear that just fell apart.
I have a multimeter here how do I test it?

View attachment 62941

All I know is the small gear shaft drives the "pots" gear and the idea is that the little gear is in the moving screen and runs along the track to raise or lower the pop up screen. Obviously stopping the motor when screen is up max or stopping motor when screen is down low.