X220 dark LCD screen

Hi,
I've got a problem with my X220 LCD screen. The screen is very dark (almost can't see anything). In the past I 'd similar problem with T410s and it's the fuse on the motherboard. That LCD has inverter, but I checked the one on another laptop and it looks OK. The same is with the screen - when I put it into another X220, it works. So it looks, that there's something with the motherboard. Ca anybody tell me if there's any LCD fuse on the motherboard?  Where can I find the one?

Hi,
there is a lot of fuses with screen circuites connected (CN4 - screen itself, CN3 - parts in the lid). The first group of fuses is placed on the CPU side of the PCB (or backside of the laptop), right near of the docking connector (CN4 connector is placed on another side).
The number of fuses are: F1 (20V circuit), F2 (3V), F6 (3V). Nominals of the fuses are listed near of the DM1 (RAM socket)
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