iMX6 DL Getting Damaged

[sohailakram]

Hi All,

We have designed our custom iMX6 DL board based on SABRE SDP. 

Our application gets Video and Pictures from Ethernet which are then displayed on and LED display though HDMI Output. Yesterday, we were testing our application on our custom board and suddenly board stopped working. The iMX6 got extremely hot. We removed iMX6 from our board and found that pin K21 (EIM_EB0) was damaged/fried up. Please see attached images showing the pin. We are not using pin K21 yet and kept it available as GPIO on external header. However, in software the pin is configured as DISP1_DATA11; we never changed its default status.

Today we tested our second board and after few hours of testing, the board also stopped working. We are not sure yet if some problem occurred in this board as well. We will de-solder the iMX6 tomorrow and will verify if damage was to pin K21. 

We made 10 prototype boards and all boards passed stress test (stressapptest). 

Can someone please let us know if they have experienced anything like that or have a clue to what is happening with our boards. 

Please see the attached pictures. 

Thanks All,

Sohail

[sohailakram]

Hi Igor,

Thanks for your response. 

-voltages exceeded absolute maximum ratings given in datasheet

- incorrect power-up sequence

- applying external power voltages before processor fully ended

power up sequence

[SOHAIL] We are using MMPF0100 PMIC for powering our board. So, I believe none of above could have happened to the board.

- overheating

[SOHAIL] We are using consumer grade iMX6. The case temperature of iMX6 on our board doesn't exceed 35 degree Celsius with our application running on the board (20 degrees ambient temperature). 

- ESD discharge, improper ESD handling

[SOHAIL] This could be a possible reason that our iMX6 are getting damaged. But do you think ESD can cause a damage to an extent that a pin on iMX6 gets fried up, as shown in the pictures in original post?????

Thanks,

Sohail

[igorpadykov]

Hi Sohail

>do you think ESD can cause a damage to an extent that a pin on iMX6 gets fried up,
>as shown in the pictures in original post?

yes, as ESD damages internal structure, so after applying voltage
silicon can be burned.

Best regards
igor

[igorpadykov]

Hi Sohail

proccesor may be damaged due next factors:

-voltages exceeded absolute maximum ratings given in datasheet

- incorrect power-up sequence

- ESD discharge, improper ESD handling

- overheating

- applying external power voltages before processor fully ended

power up sequence

Best regards
igor
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