OPPO F1S BLACK BLANK SCREEN

Good evening, this time we discussed the problem of Oppo cell being submerged in water, resulting in a dark LCD
how to check the LCD by the way we see whether the LCD is alive or not
If the LCD looks like an image, but the lamp is off, the problem is there is a path that is broken, how to check the picture below
note: the problem is the same but the process is different...