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820 3115

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    issue in 820-3115 board with U6100 on 5 & 6 pins ( no chime )

    so i recently have a board with no chime ( 820-3115 it must be a A1278 from 2012 ), following the circuit schematic i found that component U6100 does not have voltage in 5 & 6 pins, those are for SPI_MLB_MOSI and SPI_MLB_CLK, i follow the trace until U1800, all traces have continuity but...
    • pavulzavala
    • Thread
    • 820 3115 macpro no chimes boot problem gpu no chime
    • Replies: 0
    • Forum: MacBook Pro
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