HP ProBook 450 G1 - nie startuje, miga dioda przy gnieździe zasilania

Measure the voltages to ground on pins 1, 6, 23 of PU4503.

Below measurements from PU4503 (RT8223MZQW) without PQ4402:

Pin	Voltage
1 (ENTRIP1)	1.09 V
6 (ENTRIP2)	0.78 V
23 (PGOOD)	0 V

Replace PU4503 (RT8223M).

Measure voltage and resistance to ground of PL4501, PL4502.

Machine napisał(a):Measure voltage and resistance to ground of PL4501, PL4502.

The author has already performed these measurements in previous posts:

xamledyD napisał(a):

Cewka	Napięcie
PL4501, PL4502, PL4701, PL4702, PL4801, PL4901	0 V

Cewka	Rezystancja
PL4501, PL4502	dziesiątki kΩ (pływa)

I've replaced PU4503 with a new one - still no changes in board reaction.

Below measurements from new PU4503 (RT8223MZQW) without PQ4402:

Pin	Voltage
1 (ENTRIP1)	1.14 V
3 (REF)	2.00 V
6 (ENTRIP2)	0.82 V
8 (VREG3)	3.38 V
13 (EN)	5.2 V
16 (VIN)	18.25 V
17 (VREG5)	5.01 V
18 (ENC)	3.35 V
23 (PGOOD)	0 V

Measure the voltages on pins 7, 9, 22, 24 of PU4503.

Below measurements from new PU4503 (RT8223MZQW) without PQ4402:

Pin	Voltage
7 (VOUT2)	0 V
9 (BOOT2)	4.53 V
22 (BOOT1)	4.59 V
24 (VOUT1)	0 V

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

I already did like I mentioned in 3rd message. I have used file from here: hp-probook-450-g1-t35297.html
No changes.

Measure the voltages to ground on pins 15, 39, 58, 68 of KBC chip.

Below measurements from U2401 (KBC1126-NU) without PQ4402:

Pin	Voltage
15 (CAP)	1.84 V
39 (ADC3/GPIO23)	1.4 V
58 (VCC1)	3.36 V
68 (VCC0)	3.17V

I've replaced PU4503 with a new one - still no changes in board reaction.

New or recovered component?
Correct welding?

New component, soldered properly.
Do you think that new RT8223 can also be faulty according to measurements?
What else can I check?

The voltage values ​​on PU4503 are correct.
The resistance values ​​to ground on PL4501, PL4502 are correct.
The fault is PU4503 or PU4501, PU4505, PU4502, PU4506.
Replace PU4501, PU4505, PU4502, PU4506.

Below measurements from:

PU4501 (TPCC8067, on board I have AON7410)

Pin	Voltage
1-3 (source)	0 V
4 (gate)	0 V
5-8 (drain)	18.98 V

PU4502 (TPCC8067, on board I have AON7410)

Pin	Voltage
1-3 (source)	0 V
4 (gate)	0 V
5-8 (drain)	18.98 V

PU4505 (TPCC8065, on board I have AON7506)

Pin	Voltage
1-3 (source)	0 V
4 (gate)	0 V
5-8 (drain)	0 V

PU4506 (TPCC8065, on board I have AON7506)

Pin	Voltage
1-3 (source)	0 V
4 (gate)	0 V
5-8 (drain)	0 V

PU4501, PU4505, PU4502, PU4506 the gate signals should be measured with an oscilloscope.
The fault is PU4503 or PU4501, PU4505, PU4502, PU4506.

Laptop został naprawiony poprzez wymianę płyty głównej na używaną z portalu aukcyjnego.
Thank you Machine and matic for your tips in this thread.
Temat zamykam.