[DEFECTIVE] 2x Panda + IO

If you're having trouble with your LattePanda, here's the place to get help.
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    - Have you tried a hard reset?
    - Are you using a 5V@2A+ power supply and a high quality USB cable?
    - Have you tried powering the board through the CN2 headers?
    - Have you tried a cooling solution such as a fan or heatsink?
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    Post Reply
    User avatar
    CHAG
    Posts: 11
    Joined: Thu Aug 02, 2018 9:03 pm

    Mon Nov 12, 2018 12:49 pm

    Hello,

    I have two more Pandas + IO Shield(s) for RMA.

    #1
    Again the IO Shields power converter failed and passed 12v source voltage into the Panda. Both parts were pretested to work but failed as combination after about 10-15 seconds. (We already have one Panda with same issue in RMA shipping process)


    #2
    Very unsure but the USB 2.0 area seems to be faulty. It destroyed a logitech unified reciever while assembling. First I thought the USB receiver just died by random. I moved the prepared panda into its final environment and attched a VSCOM CANusb device that is USB2.0 Certified and uses not more than 500mA. After about 10 minutes of operation the area around USB2.0 connectors began to visibly dispend hot air and smell like buring plastic. Both, Panda and VSCOM device defective now :(
    IO Shield shouldn't be the problem here because the destroyed logitech receiver was only attached when using 5V via USB psu.

    PS: I tried to directly add this new case to existing mail conversation of our previous RMA but didn't get any anwser. So I re-request this RMA as recommended via forums.

    Ty

    User avatar
    LattePanda
    Site Admin
    Posts: 2467
    Joined: Wed Jan 20, 2016 9:09 am

    Fri Nov 16, 2018 11:31 pm

    @Chag, please share with me your order info here. Thanks! BTW, how many LattePanda and IO board you've purchased? Coz this the only case we have heard about the IO board output 12v to board. And there's no similar case in our stock after checking also.

    Look forward to know more info. Thanks.
    Enjoy Tinkering with LattePanda ! :lol:

    User avatar
    CHAG
    Posts: 11
    Joined: Thu Aug 02, 2018 9:03 pm

    Mon Nov 19, 2018 1:51 pm

    Hi,

    this is all from the same mouser.com order of 4 Panda, 4 Shield, 4 Cooper coolings.
    So currently running RMA (1Panda+Shield) is from same order as the new RMA of 2 Panda + 1(2) shield.
    1x The IO 12V case is the same as before.
    1x The USB case is new problem that happend (or maybe another result of IO Shield error too)

    Our total amount is 10 Pandas 6 IO Shields. Where obviously 2 shields and 1 Panda were broken but the broken shields also killed 2 healty Pandas.
    We have 4 Pandas and shields up and running. 2 pairs newly assembled and 2 pairs are running for over 6 month now.

    Here's link to previous post that lead to RMA via Mail. The current parcel status is "arrived in target country" so it's correct that you don't have recorded feedback about this case in you db yet.
    https://www.lattepanda.com/topic-f6t16825.html

    User avatar
    LattePanda
    Site Admin
    Posts: 2467
    Joined: Wed Jan 20, 2016 9:09 am

    Wed Nov 21, 2018 8:45 pm

    CHAG wrote:
    Mon Nov 19, 2018 1:51 pm
    Hi,

    this is all from the same mouser.com order of 4 Panda, 4 Shield, 4 Cooper coolings.
    So currently running RMA (1Panda+Shield) is from same order as the new RMA of 2 Panda + 1(2) shield.
    1x The IO 12V case is the same as before.
    1x The USB case is new problem that happend (or maybe another result of IO Shield error too)

    Our total amount is 10 Pandas 6 IO Shields. Where obviously 2 shields and 1 Panda were broken but the broken shields also killed 2 healty Pandas.
    We have 4 Pandas and shields up and running. 2 pairs newly assembled and 2 pairs are running for over 6 month now.

    Here's link to previous post that lead to RMA via Mail. The current parcel status is "arrived in target country" so it's correct that you don't have recorded feedback about this case in you db yet.
    https://www.lattepanda.com/topic-f6t16825.html
    Yes CHAG, Sure. Please contact with Mouser to get quick local replacement directly! And we will assign our product team to review all stocks for the problem you mentioned!

    Let me know if it works.
    Enjoy Tinkering with LattePanda ! :lol:

    User avatar
    calpin
    Site Admin
    Posts: 22
    Joined: Fri Apr 15, 2016 9:21 am

    Fri Nov 23, 2018 6:22 am

    @Chag, How do you supply the 12v? Can you share more details?
    We submit your question to our engineers and they want more information before can figure out the reason.

    User avatar
    LattePanda
    Site Admin
    Posts: 2467
    Joined: Wed Jan 20, 2016 9:09 am

    Sun Nov 25, 2018 8:40 pm

    CHAG wrote:
    Mon Nov 19, 2018 1:51 pm
    Hi,

    this is all from the same mouser.com order of 4 Panda, 4 Shield, 4 Cooper coolings.
    So currently running RMA (1Panda+Shield) is from same order as the new RMA of 2 Panda + 1(2) shield.
    1x The IO 12V case is the same as before.
    1x The USB case is new problem that happend (or maybe another result of IO Shield error too)

    Our total amount is 10 Pandas 6 IO Shields. Where obviously 2 shields and 1 Panda were broken but the broken shields also killed 2 healty Pandas.
    We have 4 Pandas and shields up and running. 2 pairs newly assembled and 2 pairs are running for over 6 month now.

    Here's link to previous post that lead to RMA via Mail. The current parcel status is "arrived in target country" so it's correct that you don't have recorded feedback about this case in you db yet.
    https://www.lattepanda.com/topic-f6t16825.html
    We've checked our testing program, which includes full testing for the issue feature u mentioned. Means every board shipped is good for this feature. To help us to position the potential problem. Please help to reply @calpin questions!

    Thanks. And look forward to your update!
    Enjoy Tinkering with LattePanda ! :lol:

    User avatar
    CHAG
    Posts: 11
    Joined: Thu Aug 02, 2018 9:03 pm

    Thu Nov 29, 2018 3:43 pm

    calpin wrote:
    Fri Nov 23, 2018 6:22 am
    @Chag, How do you supply the 12v? Can you share more details?
    We submit your question to our engineers and they want more information before can figure out the reason.
    Hello Calpin,

    sry I overlooked your requests.

    We have a 48V-57,6V source input from 4 car batteries for our complete mobile system.
    48V is only used by power electronics (motors).
    We use 2 of the 4 batteries to have a 24-28,8V power supply for all controllers and logical elements.

    -Attached to that 24-28,8V we use a DC-DC:
    LY-KREE K241205
    IN: 24V (15V-40V)
    OUT: 12V 5A (60W)
    https://www.amazon.co.uk/DealMux-Waterp ... B01EZQEI4I

    This DC-DC is directly and only connected to Latte Panda IO shields green power connector (7V-12V).

    -The IO shield got modified with a optical based voltage splitter to sense activity of 48V system on a Panda 5V IO port (No. 9).

    -Offical LattePanda 30mm micro fan/cooler attached To IO Shield 5V power

    -Hdmi Slot is using a "noname" HDMI HD Dummy to enable remote without any display or lid attached.

    -USB 3.0 has an passiv 4 Ports USB slim hub attached. Consumers attached to this hub are:

    *ST Micro Electronics Nucleo F446RE Dev board USB flash module (the uC board itself is powered from another curcuit via external input)
    https://www.st.com/en/evaluation-tools/ ... 446re.html

    *Dunker/MiControl USB CAN Stick (power usage max. 100mA)
    https://www.micontrol.de/en/products/ov ... view_mican

    *Pilz SPS System. Externally 24V powered but admintrated via USB.
    https://www.pilz.com/en-GB/eshop/001010 ... NOZ-mm0p-T

    (Not seeing this combo uses more than 500mA via USB)

    -USB 2.0 lower port has one device attached:

    *VSCOM UsbCAN using <500mA. It's USB 2.0 conform and shouldn't overstress this usb port.
    http://www.vscom.de/usb-can-plus.html


    -The only bios changes are:
    Force lid off: yes
    Boot on power : yes


    The whole system has power buffering caps to ensure stable voltages during on/off moments of the power electronics.

    System controllers(including Panda) are powered on when plugging in an combinated highend plug, there's no switch or something like that.
    So usually Panda boots together with all other controllers. But the IO Shield damage cases also happened when additional controllers
    where turned off, power electronics also not attached to system.

    The Panda shutdown is managed gently by IO trigger and windows script via Arduino Standard Firmata.
    Constant regular workload of Panda is swapping from 30-60%

    I hope this gives you a picture ;)

    User avatar
    CHAG
    Posts: 11
    Joined: Thu Aug 02, 2018 9:03 pm

    Thu Nov 29, 2018 5:23 pm

    LattePanda wrote:
    Wed Nov 21, 2018 8:45 pm

    Yes CHAG, Sure. Please contact with Mouser to get quick local replacement directly! And we will assign our product team to review all stocks for the problem you mentioned!

    Let me know if it works.
    Hi Panda,

    Mouser accepted to refund Pandas and send a new order. Actually they did only send one instead of 2 but I'm sure we're getting this solved.

    Our first RMA shipping to you did show new progress after 4 weeks of waiting:
    The shipment has left the import parcel center in the destination country.
    26.11.2018 18:29
    Ty for your support!

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