bcm4505 tuner

Discussion in 'Hardware troubles and Repair support.' started by tamme_tekkel, Sep 9, 2015.

  1. tamme_tekkel

    tamme_tekkel New Member

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    hello,

    i whant check my tuner bcm4505 do someone have the drawings/pcb of this tuner.
    that i can maybe repair this tuner?
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    No I have never put this on the drawing because it is usually replaced.

    I can at this moment only help you with some ohms measurements, measured from the ground to the measuring point.
    But if it helps you, is another question.

    dm800se-tunermeasurements.jpg
     
  3. tamme_tekkel

    tamme_tekkel New Member

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    thank you very much.
    i will try or i will find something faulty. normaly it will replaced this board. i looked on the internet for this board and they are not cheap around 60 euro. i will give it a shot if not then i must look for change this board.
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yeah they are expensive because of the easy sales.
    But what I mostly do first with a defective tuner is to replace the U7 LNBH21PD chip.
    Al least, If I have the feeling that it could be caused by this ic, which mostly is the case.

    However, it have a ground pad under it, that is soldered to the motherboard.
    So it's not so easy to remove, or replace.

    Best is to do it with a hot air station, and flux paste.
    Also shield the surrounding area with kapton tape, or another less solution as aluminum foil.
     
  5. tamme_tekkel

    tamme_tekkel New Member

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    thanks for the replay. i do not have a hot air station. and buy only for this case i think it's to expensieve.
    i think i buy a new tuner that's for now the best solution i think?
    thanks for the answers to me.
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Yes if you still have to buy all the tools for replacing a ic, then it is wiser to buy a new tuner.
    So a wise decision.
     
  7. tevit029

    tevit029 New Member

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    hello the ic on the tuner u2 the number of the ic ore the shematic diagram
     
  8. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    U2, Marking code M9-JZ which is also used on the dm500hd is most likely the ISL55016.
    For more info see the datasheet.
     

    Attached Files:

  9. tevit029

    tevit029 New Member

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    thnks. eny solution to repair my tuner no signal somtime I got a 15 min end thats all
     
  10. tevit029

    tevit029 New Member

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    the file das not open you send
     
  11. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    Hard to say what it could caused it but most simplest is to test it with another tuner to exclude other causes.
    Because it could be a tuner issue, or a issue with the motherboard.

    As for the datasheet, I've uploaded it again but from my side is the pdf working with the free pdf reader foxit.
    Otherwise google to the ISL55016 datasheet.