Acer Aspire ES1-512 EA53-BM/EG52-BM 14222-1 - nie włącza się

Hello,
The laptop does not turn on, after pressing the power button the blue LED lights up, no display, the fan does not spin.
I flashed the bios, replaced the RAM, reset the bios.
I checked coils and didn't find short. No element gets hot.
I checked 5V and 3v3V were available

what could have happened? what else can i check?

Measure the voltages on pins 4, 5, 6, 7, 8, 9 of PU5102.
Measure the voltages on pins 1, 3, 5 of PU5103.
Measure the voltages on pins 1, 3, 5 of PU5101.

after turn on, when lithing led blue current is 40mA.

PU5102.
4 - 1V
5 - 3,3V
6 - 5V
7 - 3,3V
8 - 3,6V

PU5101
1 - 3,3V
3 - 3,3V
5 - 1,8V

PU5103 - not mounted, looks as if it was originally not mounted

Measure the voltages on pins 4, 6, 10, 12, 14, 19, 20, 21, 63, 64, 73, 88, 95, 99 of U2404 (KBC)
Measure the voltages on pin 93 of the KBC in the following cases:
at power off
with pressed power on
to power on.

I did measurements:

4, - 0V
6, - 0V
10, - 0V
12, - 0V
14, - 3,2V
19, - 3,2V
20, - 3,2V
21, - 3,3V
63, - 1,8V
64, - 3,2V
73, - 0V
88, - 1,8V
95, - 1,6V
99, - 0,5V


pin 93 of the KBC
at power off - 3,2V
with pressed power on - 0V
to power on - 3,2V

Measure the voltages on pins 2, 3, 5, 6, 8, 12, 15, 16, 17, 20 of PU4901.

PU4901
2- 1,3V
3 - 0,66V
5 - 0,66V
6 - 1,8V
8 - 1,3V
12 - 5V
15 - 6,4V
16 - 3,3V
17 - 3,25V
20 - 1,3V

Power on measurements.
Measure voltage and resistance to ground on all coils.

PL4092 - 1 kohm - 1,3V
PL5001 - 40 ohm - 0V
PL4701 - 11 ohm - 0V
PL4801 - 15 ohm - 0V
PL4502 - 3,3 kohm - 3,3V
PL4501 - 500 ohm - 5V
PL4401 - 10 Mohm -2,7V

Measure the voltages on pins 2, 3, 5, 6, 8, 12, 15, 16, 17, 20 of PU5001.

Hi, I returned to repair after the weekend. I did measurements:
PU5001
2, 0V
3, 0V
5, 0V
6, 0V
8, 0V
12, 5V
15, 0V
16, 0V
17, 0V
20, 0V

PU5001 (TPS51716RUKR-GP) is damge?

Replace PU5001.

Mimek написав:PU5001
15, 0V

Is this measurement correct?

PU5001 - 15 was 5V - i made mistake.
I soldered the new PU5001 and now there is a short circuit on the board.
The board doesn't turn on, it consumes a lot of current. On the laboratory power supply, I limited the current to 1.5A and PU4201 and PU4401 is hot
Now there isn't 5V and 3,3V

Mimek написав:PU5001 - 15 was 5V - i made mistake.

With this measurement the old PU5001 is not damaged almost for sure.

Mimek написав:PU4201 and PU4401 is hot

You probably have a short circuit to ground on main power rail "DCBATOUT".
Measure the resistance to ground on pin 1 of transistor PU4401.
If the resistance is low (in Ω range), measure the resistances on all coils in reference to pin 1 of PU4401.

Resistance to ground on pin 1 of transistor PU4401 - 38ohm

Resistances on all coils in reference to pin 1 of PU4401.
PL4092 - 12,7kohm
PL5001 - 2,3 ohm
PL4701 - 47 ohm
PL4801 - 50 ohm
PL4502 - 3,6 kohm
PL4501 - 420 ohm
PL4401 - 16 Mohm

The "high-side" transistor PU5002 is damaged almost for sure.
This fault is 99% sure related to your soldering on the chip PU5001 - some of its pins may not be soldered, there may be a short circuit between some pins or some other "mess" around this chip. You may also damage the APU hybrid this way.

However, remove the transistors PU5002, PU5003 and chip PU5001 from the board and perform the following measurements:
- Remeasure the resistance to ground on pin 1 of transistor PU4401.
- Measure the resistance to ground on coil PL5001.

I checked the PU5001 chip carefully after soldering and I did not find a short circuit

I removed trasinstor PU5002, PU5003 and chip PU5001 and I did measurements:
- resistance to ground on pin 1 of transistor PU4401 - 37Mohm
- resistance to ground on coil PL5001 - 42ohm

After removing the PU5002 and PU5003 transistors, I checked:
PU5002 - is damaged
PU5003 - is good

Replace both transistors - PU5002 and PU5003 regardless of whether if one of them seems good.
Also replace the chip PU5001. You can solder the old (original) chip back to the board, because it is good almost for sure.