No image appears on the LCD screen and also on the external monitor. It even provided an image on the external monitor after I made a reflow on the processor that it is soldered directly onto in motherboard. Measuring the voltages at the pins of U8 only on pins 4 and 5 provides 3.3V voltage on the other pins of U8 has no voltage. I think on pins 1 and 3 there is no voltage because I have to do only one reball in the processor, am I right?

I think thats right

the defect will only be resolved by reballing the processor shared with the video.