Power supply damages motherboard when a computer assembler purchases power supplies without consulting specifications. Intel specs for ATX power supplies demand that PSU not damage motherboard and other components:
Too many computer assemblers don't have necessary technical knowledge and therefore don't even know that overvoltage protection (OVP) has been a defacto standard for 30+ years. That motherboard damage probably may be traceable to the ill-informed computer assembler (who does not demand specs) or a power supply manufacturer who outrightly lies on his specifications.
There is nothing in a UPS that will accomplish the necessary OVP.
Other essential functions that should be found in the power supply specification, but that many 'bean-counter' selected supplies may be missing: Specification compliance: ATX 2.03 & ATX12V v1.1 Short circuit protection on all outputs Over voltage protection Over power protection EMI/RFI compliance: CE, CISPR22 & FCC part 15 class B Safety compliance: VDE, TUV, D, N, S, Fi, UL, C-UL & CB Hold up time, full load: 16ms. typical Efficiency; 100-120VAC and full range: >65% Dielectric withstand, input to frame/ground: 1800VAC, 1sec. Dielectric withstand, input to output: 1800VAC, 1sec. Ripple/noise: 1% MTBF, full load @ 25°C amb.: >100k hrs
Power supplies missing these and other functions are sold at good profit in the North American computer clone market. OVP must be in all computer supplies but is often missing in clone computers.
"J.J." wrote: