Chosen Solution
I want to use the iPhone backlight panel as a readily available and cheap custom light source. With iPhone 4 backlights this was easy, as they only have 2 pins and when you apply 20V at 20mA they will light up beautifully. But now I want to use the bigger iPhone 6 (or 6s) backlight with 3 pins. Can somebody please point me to a datasheet or give me information on these pins. Thanks!
To get the right answer posted: it is 3 contacts (front and backside are connected with each other). 1+2 are GND and 3 is +18V. This will make all 12 LEDs light up.
One pin is + one is - and the other is a line for the U1502 backlight control ic chip.
When applying the same voltage to the 3rd and 4th contacts, only one of the two backlight sections is working. The backlighting works completely only if you apply two kinds of voltage +18 to 3 pin and +12 to 4 pin as mentioned in the post above. It is possible to put a resistor 300 ohms before the 4 pin, then both illumination sections will work equally. Most likely there is just such a resistor inside after 3 pin. P.S. The possible reason for such a scheme is designed by Apple apparently so that people could think and develop in their spare time)
