Need help with Power Supply Issue

Discussion in 'The Projects Forum' started by dlack, Mar 4, 2015.

  1. dlack

    Thread Starter New Member

    Jan 3, 2014
    8
    0
    I have an 800W power supply ballast that is suppose to distribute approximately 50V at #'s 5 & 6 when switch is on 115V (please see attached schematic). I'm getting a reading of 0 for each. I've tested resistors, Fets, diodes, bridge, IGBTs, thermal switch etc. They look good but not cancelling out that there could be something I missed regarding those. Additionally didn't see any visual damges. Any suggestions please?

    Thank you
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    Bad capacitors?
     
  3. dlack

    Thread Starter New Member

    Jan 3, 2014
    8
    0
    I'll double check those to see if problem is with them

    Thank you
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,155
    3,061
    Unfortunately only an ESR meter can tell good from bad, unless of course one has actually burst.
     
  5. kdcouture200

    Member

    May 22, 2010
    17
    2
    Looking at your schematic it looks as if you have a dead short after C4. This would make the rest of the circuit useless electrically speaking.
     
    wayneh likes this.
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