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

[neuberfran]

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

[robertferanec]

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

[neuberfran]

@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

[neuberfran]

@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.

[robertferanec]

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.

[neuberfran]

@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

[neuberfran]

@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:

[robertferanec]

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).

[neuberfran]

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

[neuberfran]

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