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Hardware Support Uno 4k Se heat

Discussion in 'Hardware Support' started by Coutchoulou, Mar 27, 2018.

  1. Coutchoulou

    Coutchoulou Member

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    Hi,

    Is it normal my 'uno 4k se cover is hot after a complete night in standby ?
    It's on the right side of the device (so not the HDD)..
    Do you notice the same problem ?
     
  2. peebee

    peebee Donating Member Member

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    No problem here. Mine just gets warm.
     
  3. Coutchoulou

    Coutchoulou Member

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    Yes. It's warm, not hot.
    But my previous Duo2 was cold in standby
     
  4. DirtyDonki

    DirtyDonki I am the Nice One Staff Member Admin

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    Buy a fan & install it if there is room but I am sure that this would have been included by design had the developers considered it to be necessary.
     
  5. RoyalFlush

    RoyalFlush Member

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    Looking at the picture here:
    34465-4a3492cd007b3df0ca2524780d3d94a3.jpg
    the processor and power regulation is on the right hand side of the unit. That is where you would expect most of the heat to be generated. As you can see, the big black piece of metal held down by 3 silver lugs on the right - the heatsink on the processor - is what is used to distribute the heat away from the chip.

    Note that if you do open the unit and install a fan, you will most likely invalidate your warranty (stating the obvious, sorry).

    As the term 'hot' can be somewhat subjective, perhaps measure the temperature of the case where it is hottest and others can validate the expectation with a comparative measurement. Hopefully, you will find some comfort in knowing how your units compares to others.

    Good luck.
     
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  6. Coutchoulou

    Coutchoulou Member

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    Thanks but I wonder why the processor and power regulation are working in standby..
     
  7. RoyalFlush

    RoyalFlush Member

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    You need to establish if you perception of 'hot' is unusual compared to what other peoples' units are doing as I suggested previously.

    The way these boxes are designed (generally) is that the unit does not switch off entirely when in standby. Some circuitry needs to stay awake to detect when you press a button on the remote to switch it on. And possibly, if scheduled recording needs to be activated, some circuitry needs to be alive to check for the event. Probably most other circuitry can be put to sleep while not recording or possibly even checking for OTA firmware updates in the background.

    Most processors have low power modes and sleep modes to reduce power usage as required. However, efficiency is down to the specific implementation - both of the people that design the chips and the hardware engineers that design the power supplies. The power supplies convert from a higher voltage down to lower voltages (12V -> 5V -> 3.3V -> 1.9V -> 0.9V etc). The conversion is not 100% efficient and energy is lost in the form of heat when this happens. Technologies have improved vastly with switch mode power supplies. However, they are most efficient when supplying higher loads ie. less efficient in standby mode.

    Also, the processor gets instructed by software/firmware when to enter standby mode. Poorly written or buggy software that does not implement this correctly can also result in a non-efficient standby mode resulting in the unit being 'hot'.

    Sorry for the highly technical response but since you are asking why... It might help if you tried another flash image. It could give different results.

    Without being given the circuit diagrams and source code, it would not be possible to pin point exactly why your unit is 'hot' in standby. Probably not the answer that you were looking for.
     
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    Last edited: Apr 9, 2018
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