Acer Swift sf314-51-55 doesn't start

[giulio93]

Hi everyone, I have a problem with this pc. The problem is so strage so I Will try to do my best. The pc doesn't start. The 3.3 on keybord and on a couple of caps bear the i/o chip is present. When I press the power Button the 3.3 on keybord went to 0 but the pc doesn't start. If i pluged the charger no lights show off. I try to use my lab power supply and in this case The pc starts and charges. Now If I Plug the standard charger the pc get the charge (led on) and if i press the power Button the pc starts. In this state I can start the pc for a agile but last evening the pc works Now don't. What can be the problem? Can you help me please? Thank you all

[mon2]

Re: Acer Swift sf314-51-55 doesn't start

Test with another recommended power adapter. Sounds like the original is flaky since the lab power supply works.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Test with another recommended power adapter. Sounds like the original is flaky since the lab power supply works.

But also with the battery the laptop doesn't turn on.
to recap: with My lab power supply The laptop works and it still works for a while (with The battery too). After a while The laptop seems to be Death.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

When I say that the laptop works I mean that it turn on and off normally

[natic]

Re: Acer Swift sf314-51-55 doesn't start

Hello!

Please, specify the motherboard marking code.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Hello!

Please, specify the motherboard marking code.

I attached the pics.
New observation: when the battery is plugged the chip I post the pic goes to 43 degree. If I disconnect the battery it doesn't happen. Charger plugged in or nor no differences

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Errata corrige, when both the battery and the charger are connected the temp reach 46. On the caos near to it i have 5v and 3.3V.
other thing, when just The charger is plug in (battery disconnected) The Board emitt a "click" every Second ish. And in this situation a Little spot goes hot around 35 Deg. Tomorrov i'll send The pic

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

With just fhe charger plugged in the vin of this chip goes up and down from 2.8V to 3.8.
I tried to inject 3.3 on the 3.3V line and the line absorb 0.028A. It is not to much?

[mon2]

Re: Acer Swift sf314-51-55 doesn't start

Where exactly is this voltage pulsing?

If it is a 3v3 rail, then 3v8 is too high and may have damaged some parts on this rail.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Where exactly is this voltage pulsing?

If it is a 3v3 rail, then 3v8 is too high and may have damaged some parts on this rail.

Sorry, The rail pulging is The Vin so the 19V

[mon2]

Re: Acer Swift sf314-51-55 doesn't start

Remove all power. Meter in resistance mode. Measure the resistance to ground at the DC-in power adapter connector pin.

What is the resistance to ground?

See attached - are these arrow points pulsing?

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Remove all power. Meter in resistance mode. Measure the resistance to ground at the DC-in power adapter connector pin.

What is the resistance to ground?

See attached - are these arrow points pulsing?

Without The Board view it's hard for me understand where the arrows are in the logic Board. Can you Point me the mesure Point in the pics I share?

[mon2]

Re: Acer Swift sf314-51-55 doesn't start

Remove all power -> measure the resistance to ground of where you have seen the Vin rail pulsing. What is the resistance?

[natic]

Re: Acer Swift sf314-51-55 doesn't start

Measure the resistance to ground on any pin of marked resistor.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Remove all power -> measure the resistance to ground of where you have seen the Vin rail pulsing. What is the resistance?

Tell me if i missunderstand. I check on schematic of the 1225c and the pin 12 should be this one.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

Measure the resistance to ground on any pin of marked resistor.

2.48 Mohm

[mon2]

Re: Acer Swift sf314-51-55 doesn't start

To confirm, the adapter voltage of 19v is pulsing at the connector where there are the 2 x red wires?

Is the power adapter the original and the one recommended for use with this laptop? If the adapter is underrated, the power rail will dip.

[natic]

Re: Acer Swift sf314-51-55 doesn't start

Tell me if i missunderstand. I check on schematic of the 1225c and the pin 12 should be this one.

True.

other thing, when just The charger is plug in (battery disconnected) The Board emitt a "click" every Second ish. And in this situation a Little spot goes hot around 35 Deg. Tomorrov i'll send The pic

Please, post a picture of the hot spot.

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

To confirm, the adapter voltage of 19v is pulsing at the connector where there are the 2 x red wires?

Is the power adapter the original and the one recommended for use with this laptop? If the adapter is underrated, the power rail will dip.

No is not pulsing At The connector. The adapter is a compatibile one with 2.37A

[giulio93]

Re: Acer Swift sf314-51-55 doesn't start

True.

Please, post a picture of the hot spot.

Here