I have a really old (1988) 26" Mitsubishi that has been bulletproof with two kids until a recent power company voltage problem in a local transformer caused a problem (most likely anyway). Whenever a channel is selected it comes in and then seems to tune out and then tunes in and then tunes out. It's like the automatic tuner isn't ever locking onto the channel. Any ideas what this could be? Is it simply a case of dopping in a new part? Thanks!