Help with smd component

Discussion in 'General Electronics Chat' started by marvoo, Feb 2, 2013.

  1. marvoo

    Thread Starter New Member

    Feb 2, 2013
    4
    0
    Hello,
    I have got a broken smd component, but I can't find out what it is and what the specs are.
    It come's from a Vaiilant 370 thermostat.
    On the package it has this info: EF 41 B and some logo. In another thermostat there is the same component, but with the info: EF 06 and the same logo on it.

    Can anybody help me find out what it is, so I can replace it.
     
  2. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    It's a diode of some kind, but I think it could be a schottky, a normal silicon diode, a zener.
    Maybe a photo of the board it was removed from would give more clues.
     
  3. marvoo

    Thread Starter New Member

    Feb 2, 2013
    4
    0
    I mada a photo from the board and a schematic, so far I can.
    The component is making a short, so the thermostat didn't boot anymore. I removed it and now it boots. But it doesn't communicate. E-bus.
    I guess it has something to do with filtering the communication signal out.
     
  4. BigNiko

    New Member

    Mar 30, 2009
    2
    1
    marvoo likes this.
  5. marvoo

    Thread Starter New Member

    Feb 2, 2013
    4
    0
    I started trying out some in hole components.
    The thermostat works when I put an zener diode in place. Info on the zener is 5v1 83c.
    Can someone confirm that this is a good replacement?
     
  6. marvoo

    Thread Starter New Member

    Feb 2, 2013
    4
    0
    I forgot to mention that the powersupply of the thermostat is 24V dc.
    But it can work from 9 to 24V dc
     
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