Not a 170 or 180. I have run these with the batteries removed.

You need to smell around the DC jack area after its been plugged in for a short bit. Also main battery removed. The diodes in the DC-DC converter section has a tendency to spontaneously short, and sometimes leave evidence of burning. I got a 180C a couple years ago that wouldnt power on and had "that smell" near the DC jack area.

Found it, fixed it, works fine. I would look at them for you, but working 2 jobs now is rough and havent had time for anything anymore, not even hobbies.