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MBP 2012 13" A1278 (820-3115)
We have replaced the LCD Connector, and tested with 4 different complete known to be good display assembly's and we still have these 'stage lights', which must point to the issue being from elsewhere. @oldturkey03 any suggestions on what we can do next?
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@livfe part of the backlight IC U9701 connects the cathode part of the LED strips to ground through PWM-controlled FETs. LED_RETURN_1 through LED_RETURN_6 lines are present on the LVDS connector (pin 24-Pin 29). A broken line on those will cause the anomaly we refer to as "Stagelight." :)
Here are the resistors for the LED Return lines
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This is a contender for "Answer of the century", ,We will check the later today and I am very confident that your help will solve this one (& others hopefully!) & will get the attention it needs to help many save from buying unnecessary parts- Vielen Danke :D
@oldturkey03 Would this also apply to MBA's (A1466) where the lights are only on one side of the display?
@livfe I seem to remember that the backlight circuitry is different. I’ll check as soon as I can and let you know asap
@oldturkey03 That would be greatly helpful as I have 2 MBA's here suffering the same .....please add the info to the answer as & when :)
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