Hi Folks,
Got a tuner here I believe the LC7207 is shot, but am hoping for an alternative to handing it back declared a boat anchor.
It came in with "manual" working OK, along with the FM memories, but no AM memory.
I replaced the rechargeable batteries (yes, they're good) and recapped it. Same problem.
I let it run for a few days, turned it off, then on... now no memories worked, but manual was fine.
Put it on the back burner for a bit (still running to keep the batteries chareged), but then upon switching from AM to FM again, FM locked up at 189.3 MHz and won't budge. No manual, no nothing.
I can even unplug all but the power wired to the board and it's locked at 189.3. I'd expect it to show zero when I did that as the frequency counter gets no input.
So, given it's a stupid P-MOS with unprotected gates (full ESD protocols were in place at the bench), I'm assuming it's the aforementioned unicorn-7207
After much Googling, seems this happened only one other time, but everyone was stuck on changing the batteries (which he did, to no avail).
Cheers!
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