Couldn't help but notice all the frustration going on through this tread but I can help you all with a work around to this problem that involves another lcd monitor.
In my case I have the same E172fpb monitor you all have and with that, the same back light issue too. I gave up trying to fix it by replacing the transistors that kept failing. I instead used the inverter/power board off my E193FP with a damaged display. Keep in mind these monitors are two different beasts.
Basically I just figured out with a multimeter which pins...
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