Mini Vu+ Duo repair trip.

Discussion in 'Other satellite receivers.' started by Johnny B., Jul 1, 2016.

  1. fingersd

    fingersd Member

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    Johnny, do you know what security chip is used on the Lonrisun VU solo as I´m wondering if it would be possible to make a security board for a Duo using a dead solo i have here. The chip had a label stuck to the top with an X on but no part number underneath. It appears to be using an 8mhz crystal
    T. I. A. Dave.
     
  2. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    There is a good chance that it might work, provided you know the correct Rx / Tx / SCL / SDA / Vcc / Gnd connections of this chip.
    Rx / Tx is usually easy to find by measuring the connections to the RS232 chip.
    Scl / Sda connections go to the CPU.
    Vcc / Gnd are obviously easy to find, sometimes it have two vcc connections to the chip.
    The crystal connections are also easy to find, but do not forget the two ceramic caps between it.

    In any case, does a security chip of a solo also work on a duo, so I see no problem.
     
  3. fingersd

    fingersd Member

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    Thanks Johnny, that gives me enough info to start tracing the old Solo mainboard. would i be correct in assuming the two Chrystal caps are 22pf ish
     
  4. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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  5. fingersd

    fingersd Member

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    Johnny B
    I was wondering if your external Duo security board would still work without the SCL & SDA connections to the Max 3232 Chip (I'm assuming these are only needed to program the security board)

    I'm only asking as i did try a V3 duo security board in one of my Mini's and it still didn't help, but I had omitted the SCL SDA

    Thanks, Mate.
    Dave.
     
  6. Johnny B.

    Johnny B. Technical Support Staff Member Moderator

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    I can only speak for the vu duo/solo security chip module for the clone boxes, but these need at least the Tx/Sda/Scl pins to get started.
    For more about this see this topic Vu Duo V3 security chip repair project.
    The text of, Secure the chip for writing to it?.