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27" display with 2560 x 1440 pixels resolution Thunderbolt & MagSafe cable attachments

I have a faint image, no backlight.

How do I get a schematic and values of componets so as to figure out where logic board is not sending power to the LED backlight.

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The displays teardown has the needed info : Apple Thunderbolt Display Teardown. Take a look at Step12 you'll need to replace the Supertex HV9982 3-channel switch-mode LED driver IC.

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