I'm working on one of the PSU's in my backlog today that came out of an NBA Jam arcade machine a year or so ago. The PSU is a Pan Yes brand with a model number PY-TV-C. From what I remember the 12v rail wasn't outputting anything. I opened it up and was reminded that the resistor at R28 had blown it's shell off and I have no idea how to ID a replacement for it. (see pictures) The color bands that are still intact a little are brown, black, missing band/bands, and what I'm assuming is silver. When I check it with my DMM it's reading 100ohms exactly but I don't know if that's what it's supposed to be given there's a shit stain down the side of the board.
The other things I've done to this PSU today before writing about it here were to check the ESR on all the caps and I ended up replacing two of them. One that was in circuit with the resistor for the 12v line and another on the 5v rail. The ESR for the one on the 12v rail was a couple ohms higher than I would have liked, especially since the replacement 1000uf 16v Rubycon had an ESR of 0.04ohms.
Other than those two caps all the transistors and diodes are testing fine without any power or load.
Does anyone have any secrets for figuring out what resistor should go there other than guessing and hoping for the best or just plugging it in and seeing if the caps were the issue and the resistor is miraculously ok?
The other things I've done to this PSU today before writing about it here were to check the ESR on all the caps and I ended up replacing two of them. One that was in circuit with the resistor for the 12v line and another on the 5v rail. The ESR for the one on the 12v rail was a couple ohms higher than I would have liked, especially since the replacement 1000uf 16v Rubycon had an ESR of 0.04ohms.
Other than those two caps all the transistors and diodes are testing fine without any power or load.
Does anyone have any secrets for figuring out what resistor should go there other than guessing and hoping for the best or just plugging it in and seeing if the caps were the issue and the resistor is miraculously ok?
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