I have a salvaged pc power supply I use as an adjustable bench supply.
But it won't go above about 14.9 volts. Apparently it has an
overvoltage protection circuit. The board has a TL494 (house-numbered
equivalent), and the only other chip on the board is a dual comparator.
The power supply is a Fortron/Source FS-250S40G.
I have another supply that also hits a ceiling when I adjust the
voltage, a Falcon Technology PE-250X with a 494 chip and a 14-pin chip
labeled DBL 339.

Is there some way I can disable the overvoltage protection on these
power supplies?