Iphone 5s does not turn on, the black screen vibrates under the charger

Hello, I have a problem with the iPhone 5s, so I bought it on the Allegro as supposedly damaged, the previous owner put it back in a functional drawer, it has been left for a year and has not been turned on since then.
I undressed it, I downloaded the screens and noticed that when it turns on the processor warms up most when it connects the charger and the display but with the disconnected charger less tel charging the batteries checked but the screen still remains black on the connected charger vibrates or makes sounds. Please help the board does not seem damaged, you can not see traces of moisture what should I first check the voltages on which and how to accurately diagnose damage to any of the system?

And you can see him under the computer? iTunes how can he see it?

The fact that the processor is warming up a bit is just normal. If the screen displays nothing, at the beginning of the substitution checked display although from experience I can say that if there was such a description then it does not bode well ...

Unfortunately, at the moment I do not have a second screen and a cable, I only have a Chinese charger I am looking for an iphone with icloud to check this display

In 4s it was a symptom of a broken LCD, so the basics of LCD to start with

U26 RF and U22 RF and U16 RF are probably missing on the board and one chip is chipped and the lcd has been replaced

smac22 wrote:

U26 RF and U22 RF and U16 RF are probably missing on the board and one chip is chipped and the lcd has been replaced

The absence of these systems is normal in this disc revision, the chipped system is not chipped, the last description layer (type of rubber / sticker on the silicon structure)
Photos of low quality but this track has nothing to do with your problem.

Just download the picture to zoom in and see everything

Check the current consumed by the hob as it turns on. Does iTunes see the phone? Does it work with a good screen? Check CPU voltage. Check the short to ground on the PP1V8, CPU, GPU line and their voltage.

The gpu voltage is terribly low, it is only 1.1 v and there is none on all capacitors