so we had a pretty bad storm roll through last week and ever since my 7300 just isnt receiving anything. transmit seems fine actually, put it on a dummy load and power output looks normal on all bands, SWR meter responds, but the receive is just dead. like completely silent, not even noise floor. tried the obvious stuff, reset the radio, checked all the connectors, swapped to a different antenna, nothing.

the weird thing is the S meter does flicker occasionally when i key up from the other radio in the shack, so maybe something is getting through? or maybe thats just RF getting into the chassis somehow, i dunno. i dont have a full schematic for this thing yet but im thinking either the preamp got fried or maybe something in the antenna switching relay. anyone dealt with this before on an Icom? im decent with a soldering iron but not sure i want to start poking around blindly without some direction.

That S meter flickering when you key the other radio is probably just pickup from the shack environment, i wouldnt read too much into that. The symptom you're describing, dead receive with TX still working, on the 7300 specifically that often points to the antenna switching relay or the RF board front end. The relay coil can take a hit from a surge and it'll stick in the wrong position or just stop switching altogether. Before you dig into the board, grab a multimeter and check if you're getting continuity through the relay when it should be in receive mode. There's a test point accessible without full disassembly if you pull the top cover.

Also worth checking the input bandpass filter area, lightning surges love to pop the small signal diodes in there. You'd see it as a dead short or open across what should be a clean filter. Icom's service manual for the 7300 is floating around online, the RF unit section is what you want. Good luck, these radios are repairable if you take it slow.

had almost the exact same thing happen to my 7100 a couple years back, different radio i know but same era Icom architecture more or less. mine turned out to be a fried input protection diode right at the antenna port. cost me like $2 in parts and an hour of careful soldering. the hard part was just finding the right diode spec in the schematic. if you dont have surge protectors on your coax lines coming into the shack this is a good reminder to add them, learned that the hard way myself.