Fuj siemens ATX PSU stby voltage too low +1.8v

Discussion in 'PC Hardware' started by mohkam, Oct 12, 2015.

  1. mohkam

    mohkam MDL Novice

    Dec 18, 2013
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    hi!
    Got fuj. siemens esprimo c5910 with power issue : no reaction to switch.

    To make pc start, need to power up PSU alone without load (by grounding pson) before connecting it to mobo

    All PSU voltages are checked ok without load (stby voltage=+5v), but when connected to mobo, stby voltage becomes low : 1.8V.

    Steps taken : swapped PSU with a good working one, pc starts normally.

    Concluded that PSU is culprit, and particularly stby rail.

    Opened PSU case, all caps are looking fine.

    Any idea as what are the main stby rail check points and where to dig further to help fixing this issue ?

    Thank you
     
  2. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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    Power supplies are kinda like eggs, they have a long shelf life but they do go bad with age and get weaker, usually the repair exceeds the cost of replacement when it comes to economy power supplies. OEM's do use the cheapest PSU they can get away with while still keeping warranty intact
     
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  3. mohkam

    mohkam MDL Novice

    Dec 18, 2013
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    #3 mohkam, Oct 12, 2015
    Last edited: Oct 12, 2015
    (OP)
    Problem is that Fuj siemens PSU are of special shape. Standard PSU won't fit. See photos attached.
     

    Attached Files:

  4. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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