its to late to explain everything. look around these posts a few of us pros have gone into detail like last week on how to do this. a quick run through though
go to valve box when valve is stuck on and running, turn each valve on, when the stuck zone is running and you turn another valve on,the pressure will drop on the stuck zone, so with the zone stuck on,open another valve,if the pressure drops on the stuck one,thats not the valve. do this until when you turn a valve on, the pressure increases or stays the same. this is for sure 1 of if not the stuck zone. if this is happening often,there is probably debris in the valve,it just moves and shifts causeing it to stick. open valve up shine a light in there since the rainbird valve is black and you can not see some things in it. turn the water on for like 2 seconds while its all apart,make sure you clear all around the valves so the water doesnt lift crap into the valve when it cant go anywhere. make sure you look with the light first,its always good to know whats causing the problem rather than just fix it. then the next time you will know what to do.
if its a clock issue, when the valve is stuck on. unplug it,or shut it off. if its an electric issue the valve will shut right off. if it doesnt. its debris moving from one valve to the next,or you dont have the right valve out there that youve been replacing. make sure everything is clean and in good shape on the valves. you can also feel the solenoid to tell if it is receiving power.
take a look around there is alot of info and tips on stuck valves.
looks like i went a little bit more than a quick run through lol