Help With Sprinkler System

Question regarding sprinkler system

Hi Guys, I just bought my house a month ago and I’m trying to figure everything out by myself. From what it looks like, I have an older sprinkler system (see links below) and have traced the plumbing back to the ICV valves in both my front and back yard, but I have no idea how to turn on the damn sprinklers. There are two hose bibs in the back yard that do nothing when I turn on. My thought is that roots from the bamboo in my back yard has grown into the piping, creating a blockage in the piping. Does anyone have any knowledge they can share? Thanks!

Sprinkler https://i.imgur.com/MK7hnX9.jpg

ICV Valve Front Yard https://i.imgur.com/5YeUW9t.jpg

Hose Bibs https://i.imgur.com/a4BZsej.jpg

submitted by /u/homeownercam
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from DIY https://ift.tt/3bNFjAQ