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Telling people they have to replace the LCD or MB is just bullshit. Let them try fixing first!
So that was my issue:
The LVDS connector is a very small and delicate piece but the LED backlight needs quite a lot of current compared to the size of the pins. I figured out what was the cause of the problem when I removed the LCD. Its socket (yes, from the LCD side, not from the laptop mainboard side) was almost burned, perhaps because of the moisture. Cleaning it carefully solved the problem. Resoldering may also help, which I also have got done.
The socket was also making the backlight appear uneven (there are six pins responsible for the LEDs, fault of any of them will cause the effect).
I suppose (I haven't checked that) the LVDS signals are something like HDMI or DVI format, which involves I2C communication, so if any of video data pins don't work, you will see mess on the display, but if one of I2C pins fail, the mainboard won't detect the display at all and you will see nothing.
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