Lenovo Y700-15ISK (NM-A541) świeci POWER ON i brak reakcji

Witam. Proszę o pomoc w naprawieniu:

Lenovo Ideapad Y700-17ISK
MB NM-A541 rev.1.0
CPU - i7
GPU - N16P-GX-A2

Laptop po kilku serwisach. Na cewkach procesora brak napięć. Grafika jest ciepła, most też (ok 40*C)
Po podaniu zasilania pobór I=0,25A. Brak zmian po naciśnięciu przycisku Power.
Na przycisku obecne 3,3V i jest ściągane do masy.

Bios był przeprogramowany, brak jakichkolwiek popraw.

Power and resistance coils attached
PL301 (1.23 V) 43 Ω
PL703 (1.28 V) 192 Ω
PL603 (0.82 V) 7 Ω
PL606 (0.82 V) 7 Ω
PL406 12 Ω
PL405 2.1 Ω
PL404 2.1 Ω
PL403 2.1 Ω
PL402 3.6 Ω
PL401 3.6 Ω
PL701 (0.96 V) 22.4 Ω
PL802 (1.06 V) 60.5 Ω
PL201 (3.3 V) 28 kΩ
PL202 (5 V) 100 kΩ
PL101 (0.84 V) 1.4 MΩ

Measure the voltages on pins 1, 2, 3, 4 of PU402, PU403, PU404, PU405, PU406, PU407.

PU402 - PU406:

1 - 4,92V
2 - 2,00V
3 - 4,84V
4 - 5,00V

PU407:

1 - 3,96V
2 - 4,98V
3 - 4,84V
4 - 5,00V

Measure the voltages to ground on pins 4, 11, 12, 15, 18, 22, 72, 74, 76, 77, 81, 83, 84, 93, 108, 109, 111, 112, 114, 115, 116, 123, 124, 128 of KBC chip.

Measure the voltages to ground on pins 86, 110 of KBC chip in the following cases:
a) Power button released.
b) Power button pressed.

4 - 3,3V
11 - 3,3V
12 - 1,9V
15 - 0,09V
18 - 3,3V
22 - 0V
72 - 3,3V
74 - 3,3V
76 - 3,3V
77 - 3,3V
81 - 0V
83 - 3,3V
84 - 0V
93 - 3,3V
108 - 3,3V
109 - 3,3V
111 - 3,3V
112 - 3,3V
114 - 3,3V
115 - 3,3V
116 - 3,3V
123 - 0V
124 - 3,3V
128 - 3,3V

a): 86 - 3,3V
``110 - 3,3v

b) 86 - 3,3V
110 - 0V

Have you tested the machine with a genuine Lenovo power supply?
If so, check the continuity between the central pin of the DC socket and pin 72 of KBC chip.

sorry.... my mistake .. not ten pin...
72 = 1.9V


I reprogrammed the KBC and no changes...

Measure the voltages on pins 70, 97 of KBC.

70=2,5V
79=0V
97=3,3V

Measure the voltages to ground on pins 15, 16, 17, 18, 26, 39, 40, 41, 42, 43, 45 of chip PU401.

PU401:
15=20V
16=5V
17=0V
18=0V
26=5V
39=1V
40=1V
41=1V
42=1V
43=3,3V
45=0V

Try to reflash the KBC chip with programmer. Don't forget to save the old dump.

I replaced KBC with a new one and programmed it. Everything looks good. The power turns on and the laptop starts up. Thanks for the help