Backlight dead, no brightness controls, LCD hardware OK
I have a strange problem on my Macbook Pro.
The backlight is not working.
Everything else is Ok, external Display works fine.
Also I have backlight on that LCD when I connect it to another macbook pro.
I checked the inverter, the I/O Board and wiring.
Found the I/O board faulty (smd resistance dead) and replaced it.
Still, the backlight is dead. (from the beginning when I turn on the MBP)
What I found strange is, that also there is no backlight-control-symbol showing on the sreen when I push F1, F2 (I made sure that it is not Fn-F1, F2). Rest of the F keys are working as they should.
Can that really be a hardware fault? - I would at least expect showing up the backlight symbol on the screen.
The display is properly recognised in the properties as it should (about my mac).
Does anybody have an idea what I am probably missing? Is there probably some analysis program that might give more information?
Thanks for your help.
Is this a good question?