LOW TIME IFR RATED PVT PLT HAS COM FAILURE ON IFR FLT. SQUAWKS 7600 AND LANDS AT VMC ARPT ENRTE.

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I HAD DEPARTED 28A WITH 1 FUNCTIONING AND 1 INOP COM RADIO. ALL MY RADIO FOR COM #2 AND BOTH NAVS; WHICH FILTERED THROUGH COM #1 WERE STILL FUNCTIONAL. I PICKED UP MY IFR CLRNC TO DLZ FROM CHARLOTTE APCH NEAR CONCORD; NC; DIRECT TO BZM VOR. BEFORE REACHING THE BZM VOR I WAS CLRED BY ZTL FROM 4000 FT TO 7000 FT FOR TERRAIN BEYOND BZM. UPON ENTERING THE BROKEN LAYER BTWN 4000 FT AND 7000 FT MY FUNCTIONING COM RADIO WENT MOSTLY SILENT. I WAS STILL HEARING FAINT; INTERMITTENT; STATIC XMISSIONS FROM OTHER ACFT AND CTR; BUT WAS UNABLE TO INTERPRET ANY INSTRUCTIONS OR REQUESTS. I CHKED WHAT I FELT I COULD AT THE TIME. (SQUELCH; VOLUME; HEADSET CONNECTIONS; ETC). AFTER BEING UNABLE TO DETERMINE A CAUSE OF THE TROUBLE; I SQUAWKED 7600. RATHER THAN FLYING THE NEXT 3 HRS 'BLIND' WITH TSTM BUILDUPS BTWN NC AND OH; I DECIDED IT WAS IN THE INTEREST OF SAFETY TO DSND BELOW THE CLOUD DECK AND FLY VFR TO THE NEAREST ARPT. I THEN DECIDED STATESVILLE; NC (SVH) WAS THE BEST PLACE TO LAND. UPON LNDG; THE FBO LET ME KNOW THAT THEY HAD TALKED TO ZTL; AND CTR KNEW I WAS ON THE GND AND MY FLT PLAN WAS CANCELLED BUT REMAINED IN THE SYS IN CASE I GOT THE PROB FIXED. AFTER INSPECTING THE RADIOS; AND ADJUSTING THEIR SEATING IN THE PANEL; BOTH RADIOS WERE NOW WORKING. I CYCLED THEM 2 OR 3 TIMES; WITH THE ENG ON AND OFF; AND DECIDED TO FINISH MY FLT. I REOPENED MY FLT PLAN WITH RALEIGH FSS; AND HAD NO RADIO PROBS FROM SVH TO DLZ. AT THIS TIME; I AM UNABLE TO DETERMINE WHAT THE CAUSE OF THE TROUBLE WAS; AND THE RADIOS HAVE OPERATED NORMALLY IN THE 6 FLT HRS SINCE THE FAILURE.