High-voltage arcing will produce a loud "snapping" sound and is often a sign of a power supply component about to fail. Sometimes it can be caused by intermittent connections in the high-voltage section, which can result from oxidation on connector pins. If that's the problem, the TV has to be disassembled and the various high-voltage cables disconnected and the pins cleaned then reconnected.
If you are not experienced in servicing TV's don't even think of trying this! Even with the TV unplugged, there can be significant voltage stored in various circuits which could bite you if you're not careful. It would be really bad to break the neck off the back of the CRT in an involuntary response to a shock.
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