Home aircon that's 15 years old (wall mounted in the living room) won't turn on. Mitsubishi brand. Opened 'er up, removed the single printed circuit board in there. I see no bad solder joints nor any obviously bad components. Tested all the components that I could (except for the 5 ICs) - found a few resistors that tested significantly lower in value vs what they should be. Also found 3 capacitors that were open. (I used my ol' Heathkit DMM with capacitor test function.) Two were marked 0.15 and 0.047 uf, 275 volts while the other one is 0.47 uf 250 volts . What kind of capacitor are they? I was wondering if there's anything special about these capacitors. See pic below, all 3 bad capacitors are of similar build. Perhaps I can use mylar caps of similar value I may have in my parts bin to replace the bad ones?
One other thing, what does the code 40/100/21 mean?
One other thing, what does the code 40/100/21 mean?
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