This iPhone 6 has no power due to disconnection or shorted to ground. What I first did was by visual checking. I look at all capacitor that might have corrosion. But the board was so clean. I then use my digital tested to test the capacitors one by one by setting it to diode mode. I first check on the area where vcc is connected. To make the story short I figured out what was the bad capacitor. See image below. By removing the bad capacitor, the unit came back to life :)
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