proscan hard to turn on?

The catch with repairing sets is that you really need to be able to "sniff out" the bad parts. There is an extremely high chance that it's just failed capacitors on the main power supply board... but there is a catch! Contrary to popular belief, bad caps aren't so easy to locate. Those that have shorted and overheated will be bulging due to a safety feature aspect of their design.... but most bad caps don't bulge.

Here is where pulling caps and testing them with a combination of a capacitance tester (many multimeters do this well) and their resistance known as ESR (really need a special tester here). Often caps with a bad ESR happen to read very high in capacitance - well over spec, and that's a "cheat" that at least makes the part questionable. Another cheat is to use component cooler and cool down the caps, very gradually and one at a time. Take your time, as if you cool too many and the set starts to work (and it likely will), you won't know which cap just temporarily reformed back closer to spec!

Overall pay key attention to the higher voltage caps on the power supply board. Those are the likely problem spots. Try to stick with Panasonic, Nichicon and United Chemi-Con when possible.