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820-2915 mux issue

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  • 820-2915 mux issue

    So im having an issue with lcd enable not being present.
    chase back to u9000
    it appears to be receiving proper power( pp3v3_s0, pp1v8_s0, pp1v2_s0) to the vcc and vccaux capacitors but still no lcd enable out.

    Does this mean i need to reball or replace u9000?

  • #2
    Do you get video on external screen?

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    • #3
      yes i do get external video, but it has a pink tint and kinda choppy as well. when i ran asd it had an issue with mux switching. i put it a side and came back to find that the u9000 isn't sending out the lcd enable signal.

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      • #4
        OK, this is likely a GPU issue and Apple will fix it for free. Try if it can boot in OSX on an external LCD, if it hangs during boot the GPU is fucked and you can take it to Apple for a free repair.

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        • #5
          Thats kinda what i was thinking. i have had a couple of these come in since this post. fml. guess its off the the "Genius bar"

          Thanks again

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