Problem with smps ASTEC LPT 43

Discussion in 'The Projects Forum' started by zisakis, Apr 6, 2011.

  1. zisakis

    Thread Starter New Member

    Mar 29, 2010
    Hello to everyone
    First of all sorry for my bad english.I have many smps by astec and the model is LPT43(IN=220V AC,OUT=5VDC/12VDC) ,and the problem appears when the main switch goes on and off too many times,or if the main power goes off line by a lightning,or by voltage abnormalities.Then the smps goes off and i don't have 5Vdc or 12Vdc.I open all of them and i did not found a burned fuse or short circuit.I have tested the electrolytic capacitors with oscilloscope and with a digital capacitor meter and the capacitors look's ok!
    any kind of help please?
    thank you everyone in advance
  2. debe

    Senior Member

    Sep 21, 2010
    SMPS dont like being turned ON/OFF rapidly, something is going to short or go O/C. If you want help a clear picture of the powersupply would help as we have no idea what we are dealing with!