No 12V at Tuner

Discussion in 'Hardware troubles and Repair support.' started by DM900Enjoyer, Mar 3, 2024.

  1. DM900Enjoyer

    DM900Enjoyer New Member

    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    1
    Gender:
    Male
    Hello guys,
    i have a problem with my DM900.
    Cant find any channels so i tracked the error down to not having any 12V on the tuner.
    So i checked the 12V tuner circuit and on both sides of the cap EC2104 i measure 12V.
    I guess it could be a dead Q2101. On base i can measure around 0,7V but on collector there is 12V.
    There was also some smudge/corrosion on this components so it also could be the cap leaking.
    Any ideas how i can track this down further?
    Thank you
     
    Last edited: Mar 3, 2024
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

    Messages:
    2,840
    Likes Received:
    1,518
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Netherlands
    Home Page:
    ....both sides of the cap EC2104 i measure 12V
    A; The Q2101 is possible, but I'm thinking of the Q2102 gate side, but it may also be a shorted cap EC2104.
    I would first remove/replace the 4.7uf cap to rule this out.
    More info about this, see here.