Wrinkled NAND chip

Discussion in 'General Electronics Chat' started by capacapa, Aug 30, 2013.

  1. capacapa

    Thread Starter New Member

    Mar 31, 2012
    17
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    What percentage you say that this NAND likely broken and need replacement? seems it is melted from the outside at least.

    [​IMG]


    tl;dr section:
    I got a 5 xboxes lot, and was trying to fix one of them.

    I noticed on this board the NAND chip has some kind of "wrinkle", melted perhaps? have you ever seen this kind of problem? could such IC still work with such visible defect?

    the xbox now shows the opening screen, but immediately goes either e71 error or totally shut down. I didn't test well though, I haven't put thermal paste under heat sinks, or fastened them with screws so it might be overheating quickly and it makes the system shutdown.
     
  2. pwdixon

    Member

    Oct 11, 2012
    488
    56
    All that looks like in your photo is a trail of glue or something similar laying on the device, can you try picking it off with a pin or blade to see if it really is coming out of the device? Or can you get a better photo?
     
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  3. pwdixon

    Member

    Oct 11, 2012
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    Not sure what you are trying to say, the words are there but they don't make a sentence.
     
  4. capacapa

    Thread Starter New Member

    Mar 31, 2012
    17
    1
    I thought of that as just glue, will check, but what about the wrinkle/bump in the middle of the chip, you can look at number 8 and the shadow and notice the depth and how it is malformed.
     
  5. pwdixon

    Member

    Oct 11, 2012
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    Sorry not seeing it I'm afraid.
     
  6. WBahn

    Moderator

    Mar 31, 2012
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    I'm seeing a string of transparent glue that is acting like a lens.
     
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  7. Wendy

    Moderator

    Mar 24, 2008
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    Looks like glue to me.
     
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  8. capacapa

    Thread Starter New Member

    Mar 31, 2012
    17
    1
    damn, I need a magnifier. I keep looking in the wrong places. it is glue.
    thanks
     
  9. Wendy

    Moderator

    Mar 24, 2008
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    I have found high resolution pictures make excellent inspection tools, better than a magnifier.
     
  10. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    What's a "NAND"?

    It looks like a dynamic RAM chip to me (from shape, without checking the number).
     
  11. Papabravo

    Expert

    Feb 24, 2006
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    NAND Flash memory
     
  12. WBahn

    Moderator

    Mar 31, 2012
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    I was baffled by that, too. I was looking for a quad NAND chip. I did check the number, and it is a NAND-based FLASH chip. It would have been better to call it a Flash chip, a ROM chip, a memory chip, a RAM chip -- pretty much anything but just a NAND chip.
     
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  13. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Thanks guys, I had never heard of "NAND flash" before.
     
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