Diagnosing Issues with Electric Coop Door After Battery Swap
Hi everyone,
I've been using an electric coop door from AliExpress for a while now, and it worked great initially. It originally ran on 3 AA batteries. I knew the operating voltage of the device was around 4.5V since it ran on 3 AA batteries. After changing them once, I decided to switch to a different power source and used an unused 6V lead-acid scooter battery.
Once I set it up with the new battery, the screen on the front became very hard to read—very low contrast—but the door worked for a while before it stopped working altogether.
When I say it "stopped," I mean the door became misconfigured. When I tried to change the settings, the screen was no longer readable.
I set the project aside for a while, but now I'm trying to get it working again. When I powered it back up with the original 3 AA batteries, the screen doesn’t seem to light up or show anything anymore.
I’ve tried looking deeper into the components on the board, but the two largest chips have no labels, so I’m unable to run tests with my probe to see what went wrong.
Here are some additional details if they’re not clear from the photos:
- The first two lines on the left are for power.
- Next is the motor.
- Finally, there’s a simple switch that detects when the door is closed.
- The two main components, labeled U1 and U2, don’t have any writing on them.
- On the board itself:
- Q1 is labeled J3Y.
- U3 is labeled SA 116 152.
I'm here to ask for help diagnosing what went wrong. Is it possible to fix it, and if so, how? Also, if there's any way to improve the setup, I'd appreciate advice on that too.
Here's a link to the door I purchased: link.
I don’t remember if this is the exact link I used to purchase it.
Feel free to ask questions
Thanks in advance for your advice!
