回答“Black screen on MacBook 12inch model A1534, How do I fix it?”My 12" Macbook 2015 went into black screen by idle sleep in battery mode. There was still haptic feedback on touchpad but no keyboard back-lit. When I tried to connect to external monitor, there was no display too. At least, I knew that it won't be the display panel issue. I tried power on/off several times, no success. Finally, it's resolved by resetting SMC.