Acer E5-573-3239 DA0ZRTMB6D0 Rev D - nie uruchamia się

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// Vogelek23

Wymieniłem KBC po czym udało się go zaprogramować za pomocą programatora. Mam nadal problem tą płytą główna. Gdy naciskam włącznik pojawia się na sekundę napięcie 2,5V na kości bios i znika. Płyta nie uruchamia się.
Zmierzyłem rezystancję cewek i nie ma żadnych zwarć. napięcie 3V i 5V są obecne. Czy ktoś wie co może powodować takie zachowanie?

Measure the resistances to ground on pin 1 of transistors PQ6, PQ8, PQ24, PQ25, PQ37.
Transistors PQ6, PQ8, PQ25, PQ37 pin count:

PQ6 - 2,6k
PQ8 - 2,6k
PQ24 - 60k
PQ25 - 37k
PQ37 - poza zakresem, nie ma tego tranzystora na płycie oryginalnie

Measure the voltages to ground on pin 1 of transistors PQ6, PQ8, PQ24, PQ25 for a short time when the machine is turned on.

PQ6 - before turn on 0V, for a short time when the machine is turned on 0,4V, before turn on 0V
PQ8 - before turn on 0V, for a short time when the machine is turned on 2,5V, before turn on 0,7V
PQ24 - before turn on 0V, for a short time when the machine is turned on 0,05V, before turn on 0V
PQ25 - before turn on 0V, for a short time when the machine is turned on 1,2V, before turn on 0,V
PQ37 - before turn on 0V, for a short time when the machine is turned on 0V, before turn on 0,V

Measure the voltages to ground on pins 30, 100, 112 of KBC chip in the following cases:
a) Before pressing to the power button (machine turned off).
b) After pressing to the power button (for a short time when the machine is turned on).

a) Before pressing to the power button (machine turned off).
30 - 0V
100 - 0,016V
112 - 0V
b) After pressing to the power button (for a short time when the machine is turned on).
30 - 3,3V
100 - 3,3V
112 - 3,3V

Perform the following measurements after pressing to the power button (for a short time when the machine is turned on):
- Measure the voltages to ground on pins 1, 2, 3 of transistors PQ6, PQ8, PQ25.
- Measure the voltages to ground on pins 1, 4, 8 of transistor PQ24.

PQ6
1 = 0,4V
2 = 0,4V
3 = 3,3V
PQ8
1 = 2,5V
2 = 0,6V
3 = 3,3V
PQ25
1 = 1,5V
2 = 0,4V
3 = 5,12V
PQ24
1 = 0,05V
4 = 0,4V
8 = 5,12V

- Measure the resistance to ground on pin 1 of diode PD1.
- Measure the voltages to ground on all pins of diodes PD1, PD2.
Diodes PD1, PD2 pin count:

the resistance to ground on pin 1 of diode PD1 - 6M ohm

a) Before pressing to the power button (machine turned off).
PD1
1 = 0,174V
2 = 2,4V
3 = 1,08V
PD2
1 = 2,4V
2 = 5,12V
3 = 5,2V

b) After pressing to the power button (for a short time when the machine is turned on).
PD1
1 = 0,5V
2 = 1,8V
3 = 0,6V
PD2
1 = 1,8V
2 = 5,12V
3 = 5,2V

With those measurements PU4 is faulty.

Machine написав:With those measurements PU4 is faulty.

I don't think so.

With these measurements is rather damaged diode PD2 or capacitor PC1.
Measure the resistance to ground on pin 1 of diode PD2. If the resistance is high (in kΩ range or greater), replace the diode PD2.

Matic you were right. Diode PD2 was damaged and i replaced this diode. Now before pressing to the power button current cosumption is 0,0 01A. After pressing to the power button current cosumption is 0,105A and don't change, blue led is light, no fan, no display, all voltages are present.
I tried to program the bios with different bios
I tried to program the KBC with different EC
I add that with ram and without ram motherboard works the same

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

PL11 - 2,67V
PL8 - 1,69V
PL5 - 1,5V
PL4 - 1,08V
PL2 - 1,35V
PL3 - 3,39V
PL1 - 5,12V

Measure the voltages to ground on pins 21, 22, 112 of KBC chip when the machine is turned on (power LED is turned on).

21 - 3,3V
22 - 0V
112 - 3,3V

Measure the voltages to ground on all pins of chip U17 when the machine is turned on (power LED is turned on).

the voltages to ground on all pins of chip U17 when the machine is turned on (power LED is turned on).
1 - 3,3V
2 - 3,3V
3 - 0V
4 - 3,3V
5 - 3,3V