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two pico-imx7d SOM modules died. I don't have RMA. technexion don't talk with me

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  • neuberfran
    replied
    @robertferanec I solved two imx7d-pico with reChip/BGA
    https://www.youtube.com/watch?v=v3tHZBE56G0&t=5s
    .

    Leave a comment:


  • neuberfran
    replied
    robertferanec I'm already sure what the problem is with my boards (the last one spoiled while I measured it). Can you answer me about the reballing or reChip question
    to finish?
    I don't have any board working here. I sacrificed my last pico-inx7d (ic main) but I found the damaged one and last board. The ic main stay hot
    Last edited by neuberfran; 04-21-2020, 10:21 PM.

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  • robertferanec
    replied
    neuberfran I am not sure how to help. I have already explained everything in my previous posts. Personally I would not be fixing that boards - you do not know what everything is wrong on them (e.g. it can be multiple damaged chips or components).

    Leave a comment:


  • neuberfran
    replied
    @robertferanec +robertferanec
    I know the issue. The main processor is heating up. I sent a load (4.8v more or less) in VDD_ARM_IN (which supports a maximum of 1.5v). It was during the PMIC measurements (pins 6, 7 and 8). Although the probe was thin, it closed short when the probe was between the pins and involuntarily sent extra power to the main processor.

    I need your help in order to command the resolution of the problem. Does a good reballing solve? Or just a ReChip?

    Please, look images below:

    ​​​​​​​


    Attached Files

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  • neuberfran
    replied
    @robertferanec +robertferanec

    In your answer # 04(and #06) you said: "There is often only 1 pin what you need to toggle to switch on the whole power. However, if your power supply is not switching ON automatically"

    How can I find this pin in pmic? datasheet mc32p3000a1

    https://drive.google.com/file/d/1t0F...ew?usp=sharing
    photos -> y3 cristal is on the back of the SOM module

    I have a new board pico-imx7d now. For the time being, the only difference in measurements I found was in the two resistors in the highlighted photo. On the new (working) board they measure 0.000 and on the one I'm fixing, they measure 0.378v

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  • robertferanec
    replied
    Y2 - 24MZH e Y4 37MHZ ok. The two have Y1 OK. but Y2 and Y4 not OK.
    - I just would like to add, please be sure, that your scope can measure 24MHz and 37MHz. Very cheap or slow scopes may not show the correct results.

    Leave a comment:


  • neuberfran
    replied
    @robertferanec + robertferanec I came to some conclusions by analyzing (regarding) crystals:

    In my number response: #10 03-03-2020 06:37AM i talked about pico-imx7d-one and pico-imx7d-two. The one
    have the crystals Y1 - 32K, Y2 - 24MZH e Y4 37MHZ ok. The two have Y1 OK. but Y2 and Y4 not OK.

    Leave a comment:


  • neuberfran
    replied
    @robertferanec + robertferanec In the figure this is marking 32.768 KHZ.........32khz egual 0,032mhz x 1.000.000 = 32.000 x 1/x = 0,000 031 25‬.....031 x 10 (because 031 stay in second box = 310µs (microseconds)

    https://www.youtube.com/watch?v=fa5arXRV0po&t=401s

    Last edited by neuberfran; 04-13-2020, 07:28 PM.

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  • robertferanec
    replied
    Please, did you make the calculation (about how to setup your scope) which I mentioned in my previous post?

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  • neuberfran
    replied
    @robertferanec +robertferanec Here is a schematic photo of the main crystal I am measuring:

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  • robertferanec
    replied
    I am not sure what crystal you are measuring, but take the crystal value e.g. 25MHz, put it into calculator as 25000000 and press 1/X. That will calculate the period e.g. for 25MHz the period is 0.00000004s = 40ns, so you would need to set your scope around that value.

    As I said, I am not sure what crystal are you measuring, but 5ms may be too big and you still may see something but it will not be correct.

    Leave a comment:


  • neuberfran
    replied
    I last month, I bought new kit pico-imx7d android things too

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  • neuberfran
    replied
    @robertferanec +robertferanec I bought oscilospe daniu 5012h. How to measure crystal? I tried today and got some results with 200ms and 5ms and got some results (without connecting the negative probe(1x), because when I connected that (negative) probe(1x) the value was zeroed

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  • robertferanec
    replied
    neuberfran, I explained my thoughts in my previous posts. I would recommend to find out why the boards are dying and then I would recommend to buy a new one. I am not saying it is not possible to fix a damaged board, it may be just very time consuming and there is a chance that the board may not work (or the board may not work reliably).

    Leave a comment:


  • neuberfran
    replied
    Can you help-me more, please

    Leave a comment:

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