My digital oscilloscope (test, teardown, fix)

Today let's see what's inside my DSO FNIRSI PRO handheld digital oscilloscope (5 MHz, 20 MSps). It was meant to be a short peek inside, but I ended up making a review, identifying all important components in it and also fixing the AC-only mode that for some reason didn't work. Please support me on Patreon:   / diodegonewild