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Detecting the no display issue... all voltages present.

We have a 2012 MBP A1278 that had a display issue that we cannot fathom out as all the display voltages are present & correct according to the schematics yet there is just a blank screen. Backlight fuse has been replaced. External display is working fine. all pins on the connector are giving correct readings. We have tried with 2-3 other known working screens and LVDS cables, but still nothing. What have we missed? Anyone have a list of voltages for all display outputs at hand to double check? @oldturkey03 - 820-3115. EMC 2554 i7 2.9

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whats the board number

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@tech_ni - 820-3115

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@livfe white or black blank screen? Fan speed normal or at high speed? Besides the voltage on the display adapter, what else have you checked? Why did you replace the backlight fuse? You have checked R9009 R9008 and L9080 and all are working? What voltages do you have on C9020. Do you have the board still out. If so, can you post some well-focused pictures of both side's with your Question.

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@oldturkey03 Board is at the repair shop, they never said anything about the fan so I presume all was fine just zero happening on the LCD.

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@livfe sound good. Let us know what they tell you. Sounds like the data lines that are giving you issues.

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