Samsung NP350V5C QCLA4 LA-8861P REV: 2.0 Nie włącza się.

Check your solder joints on all pins of chip UCL1.
If the solder joints are fine

The solder pins looks good.

measure the voltages to ground on pins 2, 3, 8, 9, 10, 11, 14, 15 of chip UCL1, when the machine is turned on (power LED is turned on).

2 - 3,3 V
3 - 1,07 V
8 - 3,3 V
9 - 0,6 V
10 - 3,17 V
11 - 1,81 V
14 - 2,74 V
15 - 3,27 V

Do you have an oscilloscope?

Try to replace the capacitor C16 with a value 4.7µF, package 0603 and CCL7 with a value 10µF, package 0805.

Do you have an oscilloscope?

I do not have.

Try to replace the capacitor C16 with a value 4.7µF, package 0603 and CCL7 with a value 10µF, package 0805.

I replaced the both capacitors. The same situation.

Measure the voltages to ground on all coils, when the machine is turned on (power LED is turned on).

Measure the voltages to ground on all coils, when the machine is turned on (power LED is turned on).

PL202 - 1,91 V
PL703 - 0,92 V
PL514 - 0 V
PL801 - 0,91 V
PL352 - 5 V
PL1000 - 1,03 V
PL182 - 1,81 V
PL402 - 1,08 V
PL201 - 19,2 V
PL512 - 0 V
PL511 - 0 V
PL152 - 1,54 V
PL332 - 3,3 V

Measure the voltage to ground on pin 121 of KBC chip, when the machine is turned on (power LED is turned on).

Measure the voltage to ground on pin 121 of KBC chip, when the machine is turned on (power LED is turned on).

121 - 3,2 V

Measure the voltages to ground on pins 1, 4, 5, 6, 7, 10, 11, 29, 30, 31, 36, 40, 44, 45 of chip PU500, when the machine is turned on (power LED is turned on).

Measure the voltages to ground on pins 1, 4, 5, 6, 7, 10, 11, 29, 30, 31, 36, 40, 44, 45 of chip PU500, when the machine is turned on (power LED is turned on).

1 - 4,97 V
4 - 3,22 V
5 - 1,07 V
6 - 1,07 V
7 - 1,07 V
10 - 19,24 V
11 - 1,07 V
29 - 4,82 V
30 - 0 V
31 - 4,42 V
36 - 5,03 V
40 - 4,42 V
44 - 4,63 V
45 - 2 V

Measure the resistances to ground on coils PL511, PL514 with and without CPU connected.

Measure the resistances to ground on coils PL511, PL514 with and without CPU connected.

With CPU:
PL511 - 3 Ω
PL514 - 2 Ω

Without CPU:
PL511 - 1 kΩ
PL514 - 60 kΩ

Reflash the BIOS chip. Don't forget to save the old dump.

Reflash the BIOS chip. Don't forget to save the old dump.

I programmed the new one. The same situation. But I programmed only main bios dont EC. Should I programme the EC too?

I think the issue is not related to the EC BIOS.
Test the board with another CPU.