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I've encountered sets that were fairly clean inside (but not so clean that they had clearly been washed up) with burned up resistors, etc.
Some TVs just had kind of bad power supply designs.
However, if you're seeing dark spots in the deflection area, that kind of sounds like high hours.
In general, the amount of soot on the flyback and the bell housing of the CRT is a much better indicator of use because the high voltage attracts the soot.
If it's got a lot of soot, and it has dark spots on the boards near big power resistors and the deflection, you are looking at a high hour set.
"Soot" is different that "dust" in that it's very fine and usually black. The high voltage attracts tiny particles in the air and they stick directly to the internal surfaces. The "dust" will just be solid dirt and bunnies inside the thing.
Likewise, if there's a lot of soot and no burn marks, it's also probably high hour. Not all sets had power supplies that burned up the PCBs. Personally, I see that a lot more in sets from the 80s where the part count is started to get reduced, but they don't have the simplified and optimized designs that started to appear in the mid 90s.
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