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[SOLVED]820-3476 No display

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  • [SOLVED]820-3476 No display

    Hello, I got a 13" Retina Display computer that does show anything on the display. The logic board is 820-3476. When the adapter is plugged in the light on the adapter comes on and the fan spins. On inspecting the logic board I see that Q8150 is corroded. Other than that the logic board looks just fine. Can anyone advice as to what troubleshooting steps I should look for in order to make this working.

  • #2
    Does it chime? Does a USB mouse light up when plugged in? If yes then hold a flashlight to the back of the Apple logo to check if there is an image without backlight.

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    • #3
      Hi Duke, Yes it does chime. In reference to the mouse light, when the mouse is plugged in to the left side USB port ( next to the DC in board ) the mouse light flashes rapidly and when the same mouse is plugged in to the right side ( next to the HDMI ) port it does not light up at all. When a flash light is put on the back of Apple Logo it does not show any image. Please advice further.

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      • #4
        Can you do a PRAM reset on the keyboard?

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        • #5
          I tried doing a PRAM reset, but I don't think that worked. Also one thing i observed is that the computer only comes on when connected with the adapter. On battery power it does not come on. I am not sure what %age of battery is charged as I cannot see anything on the screen.

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          • #6
            Wow i see a folder with a question mark on the screen. The hard drive is out of the system, so i Understand that the folder will go away, when a hard drive is installed. Looks like the problem is solved. But let me put the logic board and all the cables together and test the system to see if i see further issues.

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            • #7
              The computer came on normal. That means it was just an issue with the PRAM. Thanks for your help Duke.

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