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How to determine if my Raspberry Pi still usable

weiwei2

i have fried one of my raspberry pi 3 model B v1.2 , 2 weeks ago

actually i not sure what is wrong, but when i put in new OS via sd card, it can't boot

the board also becomes extremely hot. i have to say that i haven't installed any heat sink nor fan to it, but in the past this board has been running

 

now, it can't boot anymore although when i put in other os to the sd card it still try to boot it (but never successful)

 

i would think it is dead but just wonder if there is other way to find out if otherwise?

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  • in reply to weiwei2

    The lowest maximum die temperature rating (commercial) for a lot of modern ICs is 70 deg. C (158 deg. F) which is a lot more than "seems warm" to human touch. So just

    about any IC, especially ones with large transistor counts such as SoCs and RAM will "seem warm" and can still easily operate even when they feel hot to very hot. The ICs

    are specified to run at this temperature for the rated life of the IC which is usually in the 10's of thousands of hours. Running cooler than that can extend their life,

     

    Your problem started when you changed the OS on the flash card. Assuming you did nothing else that may have damaged the Pi my guess would be that is where your

    problem is.

     

     

    Just FYI,

     

    There are three standard maximum die temperature ratings. The maximum industrial die temperature rating is 85 deg. C (185 deg, F). I believe the Pi SoC is rated as

    industrial. The maximum military die temperature rating is 125 deg. C (257 deg. F), hotter that boiling water! There are also ICs that have their temperature ratings

    specified by the manufacturer because they do not fit into the standard rating system.

     

    When I first started in electronics in 1976 I worked on four Sentry IC testers from Fairchild. The high speed timing section used a very fast and power hungry type of logic

    circuit called ECL (Emitter Coupled Logic, sometimes called Current Mode Logic). If the IC didn't literally burn your finger when you touched it it was probably bad!