Is this the normal behavior? LDO shows the right voltage so does this means the issue must be located outside of the IC?

Hi Mcplslg,

thanks for your answer!

The LDO show me ~5V.
The resistance to GND on PL502 is ~100kOHM
Did that mean the IC is good?

What did you mean with "voltage divider for EN1/EN2", can i measure this somehow?

Hi,

my Lenovo 720 is dead. :-(
I guess i have found an issue on the 5V buck converter (**BAC7NH** from Silergy (also called SY8288C 5V)) but i am not completely sure so i want to ask here for some hints.
Here is a Schematic of the IC: [URL]https://prom.ua/p1498216381-sy8288c-sy8288crac-bacxxx.html[/URL]


When i attach the supply 19V, i only have 1.8V on the OUT (it should be 5V). The IC is getting hot.
The EN1 is completely off 0V, EN2 show 1.5V.
If i inject 5V on the EN1 the OUT goes up to 2.6V (but never reach 5V).
BS seams SHORT...