Zenith 25EC58 - won't turn on

[Adam]

So it's at it again -- 2 nights ago I decided I would hook up a complete set of video equipment for common formats (VHS, Beta, CED, LD, DVD) to this and make a nice place to watch all my video tapes and discs. So I was going to watch some CEDs, and it wouldn't turn on again.. It was late at night and I really was looking forward to watching those CEDs, so I tried something - My first thought was that it was the same problem, and I swapped triac and optocoupler from another set just to see if it would work - but it didn't. - now both of these Zeniths are out of commission.

Today after closer examination I noticed the circuit breaker was flipping off - Looking under the chassis I noticed the thermistor in the degaussing circuit broke apart - but that being open wouldn't cause this, something must be shorted. I disconnected electrolytic capacitors in the power supply and tested them with my old Solar CB-160 capacitor tester, some may be a bit leaky, but none are shorted (and there was no sign of 60 cycle hum in the picture the last time I used it) -- This TV gets a great picture (probably the best of any I have) - but what is it with the mysterious 'it won't turn on at all' problems...