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820-2915-B no chime no display

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  • 820-2915-B no chime no display

    So I have another one of them with 216-0810084 GPU that has a spinning fan but no chime and no signal/ backlight.
    I started by heating a bit the GPU but there was no difference.
    I have cpu vcore and gpu vcore.
    My only notice is that similar boards when they start they spin the fan for a couple of seconds and then stop and start it again before you hear the chime.
    At this board the fan spins and doesn't stop.
    Without RAM it complains by the usual audio signal.
    Also I have tested with a working bios dump but nothing happened.

  • #2
    RTC area? RTC power present? History?

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    • #3
      Any chime after PRAM reset ?

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      • #4
        PC3-10600 RAM modules????

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        • #5
          RTC area looks fine, at U2800 I get voltage at pins 2,5 & 13 normal, sadly no history for this board.
          System doesn't PRAM reset - this is also usual in some cases with GPU issue.
          PC3-10600 RAM was used from a same working macbook.
          Does it worth it to spend time? Maybe by replacing GPU and VRAMs or send it back?

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          • #6
            Don't waste your time on it. You can try to reflow the ram in case it was dropped and has a dropped solderball. Still may be the GPU even after you heated it.

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