Question about Bestec (ATX-250-12E) 250-Watt Power Supply
Before I buy a new power supply, how can I check to make aure that it did not fry the motherboard .
E Machine T 2245 wont start power supply 250 what shall I do? Prince Michael @ Rocket mail.com
Posted on Jul 13, 2009
It would be a rare incident to have a dying supply cause damage to the board, which is however, not to say that the reverse can't happen; i.e. you could replace the supply and still not have a working unit.
About the only thing you might do is note the position of the individual leads and colors on the main connector, forget the other ones, and measure from one of the ground pins (always black) to each of the other pins, noting the resistance values you find. If you are lucky, the supply may have a chart crossing the colors to voltages; unfortunately they are sometimes not there.
The 12 volt board contacts (+ & -) should measure fairly high (50-1k Ohm or more) the 5V can measure pretty low without being a problem, could be in the 5-20 Ohm area; this is a high current output. Unless black (to black), none of the leads should measure in the tenths of Ohms on the lowest scale.
Since there have been some changes in available outputs and connectors even on ATX supplies, make sure you compare pictures of the supply to your own but in any case, I would recommend using a replacment rated at 350W as this will run more conservatively and not be as stressed as the 250 you now have. It won't cost a lot more and will not consume any more power but the critical components will run cooler.
Not as a recommendation, just a current example on eBay:
The last couple I bought were $5 each with $7 shipping charge from a US source.
Posted on Sep 19, 2008
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