Marcon (similar to) ATX power supply repair
Hi all,
It's a standard computer power supply - electrically ATX type, but in a size for a desktop (not tower) - which makes a cheap source difficult. Size is WxLxH = 120x155x85 mm. The brand name is Pro-V Power, model MPT-251 (and MPT-301). It is made by Marcon. The MPT-251 failed, so I replaced with MPT-301 which worked for 6 months followed by identical failure. I am NOT overloading it. I feel almost CERTAIN the problem is dried out electrolytic capacitors (probably just one) - but there are so many and it is tight in there. The next replacement I acquired has worked for over a year, but is horrible - noisy, also fan bearing noise at start-up, also horrific radio interference. The symptoms are - when attempting to switch on, the CPU fan runs for a couple of seconds, then nothing. If anybody could help with a SCHEMATIC or tips, that would be great. Thanks in advance. Jim |
Marcon (similar to) ATX power supply repair
Jim wrote:
The symptoms are - when attempting to switch on, the CPU fan runs for a couple of seconds, then nothing. Could be several things (including some external to the PSU), but I would check for a shorted output rectifier on the +12v (or even on the other outputs. |
Marcon (similar to) ATX power supply repair
Jim wrote: Hi all, It's a standard computer power supply - electrically ATX type, but in a size for a desktop (not tower) - which makes a cheap source difficult. Size is WxLxH = 120x155x85 mm. The brand name is Pro-V Power, model MPT-251 (and MPT-301). It is made by Marcon. The MPT-251 failed, so I replaced with MPT-301 which worked for 6 months followed by identical failure. I am NOT overloading it. Maybe not according to the manufacturer's joke rating plate I feel almost CERTAIN the problem is dried out electrolytic capacitors That comes with time, heat, poor design and under-rated or fake components. (probably just one) - but there are so many and it is tight in there. The next replacement I acquired has worked for over a year, but is horrible - noisy, also fan bearing noise at start-up, also horrific radio interference. The symptoms are - when attempting to switch on, the CPU fan runs for a couple of seconds, then nothing. If anybody could help with a SCHEMATIC or tips, that would be great. Sounds to me like you're buying cheap junk supplies. Try a decent brand name. Graham |
Marcon (similar to) ATX power supply repair
Jim wrote:
Hi all, It's a standard computer power supply - electrically ATX type, but in a size for a desktop (not tower) - which makes a cheap source difficult. Size is WxLxH = 120x155x85 mm. The brand name is Pro-V Power, model MPT-251 (and MPT-301). It is made by Marcon. The MPT-251 failed, so I replaced with MPT-301 which worked for 6 months followed by identical failure. I am NOT overloading it. I feel almost CERTAIN the problem is dried out electrolytic capacitors (probably just one) - but there are so many and it is tight in there. Look for bulging electro's. -- W . | ,. w , "Some people are alive only because \|/ \|/ it is illegal to kill them." Perna condita delenda est ---^----^--------------------------------------------------------------- |
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