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Help! With troubleshooting SMPS for a Denon reciver. (Low output voltage)

Discussion in 'Troubleshooting and Repair' started by 23komma4, Mar 16, 2019.

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  1. 23komma4

    23komma4

    1
    0
    Mar 16, 2019
    Hi,

    I'm trying to fix a power supply for a denon reciver, AVRX2100W, but now I'm stuck.

    At first, the AC/DC converter (MAG258MG) had blown, so I replace that along with some diode's, see attached picture.

    When measuring the output voltage I get 1V, and it should be 5.2V.

    Any ideas on what could be the cause on the voltage drop? Thanks!
     

    Attached Files:

  2. Bluejets

    Bluejets

    4,506
    958
    Oct 5, 2014
    Denon are REALLY complex pieces of equipment.
     
  3. Martaine2005

    Martaine2005

    3,224
    883
    May 12, 2015
    @Ferdi57 said to check the zener diodes.
    He built a zener diode controller to speed up smps repairs.
    (Google translate).

    Martin
     
  4. KilgoreCemetery

    KilgoreCemetery

    240
    11
    Apr 12, 2017
    I'm no expert when it comes to this sort of stuff (read noob), but from what I understand, the optocoupler is supposed to regulate the amount of voltage that the SMPS puts out. If it's reading wrong it could throttle the output. Something like a bad zener mentioned above could certainly cause it
     
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