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Ipad Pro 12.9 2gn backlight dark spots
Well, the way to troubleshoot this is to check the two big backlight filters in diode mode first. I think that they should either read .15V or .3V...I don't remember exactly, but they should both be the same. Measure both sides of the big filter. Once you report back, then we'll know more.
3.45V is the voltage without the screen the connected. The actual backlight voltage should be much higher with the screen connected. Unfortunately, there is no easy way to measure the voltage with the screen connected. Like i said, check diode mode on the two backlight filters, then report back. BTW, you should not be running jumpers across the backlight filters.