Help with Labradar

Hi Team,
My labradar copped some blast from my muzzle brake the other day which apparently it didn't like. I think it has damaged the electronics. The screen comes on and flickers around, but nothing meaningful is displayed. And it just turns off when I try to arm it. I've tried internal batteries and a power bank, same result. Labradar don't wanna know about it, which I guess is fair enough.
Are there any clever techno folk on here that might know how to fix it?
I know, it's old technology now, but it was doing the job i needed it for and i don't really have the $$ to throw at a garmin etc at the mo.
Thanks.

2nd hand labradars have come down in price significantly

Stand down everyone. I've just opened it up and it seems to just be a loose wire. Easy fix. Cheers.