Vizio E422AR turns on, with V on screen than shuts off

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  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12129
    • U.S.

    #21
    Re: Vizio E422AR turns on, with V on screen than shuts off

    read here that a guy fixed his tv with a memory dump, was saturday I think, not sure what brand it was.

    Comment

    • tibimakai
      Badcaps Legend
      • Jan 2012
      • 3680
      • USA

      #22
      Re: Vizio E422AR turns on, with V on screen than shuts off

      Which thread?

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Vizio E422AR turns on, with V on screen than shuts off

        Yep, it's what's known as the "main app" storage. The TV's not completely dead because the bootloader is present, that's what makes the start-up logo appear. Bootloader is usually on either a smaller second NOR chip or on a protected area of the main NAND chip.

        Once it tries to read off the main app, it encounters a corrupted portion and aborts (either due to bad checksum, or because the corrupted code causes a processor exception to occur.)

        I have been working on a project like this at work, testing flash memory to destruction. Simple fact is two main things kill flash ICs: high temperature, and lots of program/erase cycles. Modern smart TVs do a lot of writes to these flash devices leading to failures in the memory. And they keep reducing the size of the flash memory cells. Wasn't so much of a problem with 40nm flash cells but they're on 16nm now, each halving in size is 1/4 the expected lifetime.

        You could probably temporarily get NANDs working by making them very cold or very hot - might help the charge levels settle to a state where they are close enough to what they actually need to be.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

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