Broken squelch scanner was working fine now nothing, no scan no sound on squelch either. i reset it again and nothing

SOURCE: scanner wont scan

provided you turned the squelch know and it didnt help, i would trace back from the squelch control to the first and second transistor you come to and that should be the squelch circuit. if you know how to check them with an ohm meter you can find out which one it is, if not you can just replace them both for under 5 bucks.

SOURCE: Won't pick anything up (uniden BC72XLT)

Not sure this would be a solution but...
Make sure you don't have the Ch. Locked out so it just skips them..

You may also try and let the scanner sit on one frequency that you know has chatter and see if you receive.

This unit also picks up local weather try that feature and you can tell if you reception is working or not.

SOURCE: I have a Uniden BC72XL scanner and cats knocked it

In your manual, if you have one, if not look it up on the internet. There are ways with all these types of communications, to reset to manufacturer and factory settings at time of new purchase. Then proceed forward in programming.

SOURCE: i got a police scanner the squelch stays on all

Try turning the squelch real slowly, most of the time its counter clockwise until it goes silent, hope this was helpful.

SOURCE: Bearcat BC144XL Scanner ~ no sound

how do i programed my uniden bc144xl