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Hmmm.. I have one like this, been a little over a year since I looked in it, so I don't remember details of troubleshooting it.  Mine is a newer one, with the "Cobra" I think it says on it PLL chip.  The PLL chip is dead.  Rest of the radio is great condition.  I just kept it around for parts or when I get an ugly radio in with a good PLL chip for it...I tried swapping in an older non "Cobra" PLL chip, no workie.  If I remember right it was kind of common to see dead PLL's with the "Cobra" stamped on them (all newer radios, not the old shool real Cobra 25 Classics).