Acer a315-55g-73n7

[luigi55]

Not even a total dead LED lights up, the customer says he sparked the power supply in the power jack which I found broken, in fact I power it with soldered cables on main, replaced the power jack input diode which was broken. Mod. mb DA0ZAWMB8E0 rev.E
Thank you

[mon2]

Re: Acer a315-55g-73n7

Need voltage checks. See attached. Post the measurement of each test point.

Meter in DC volts (20V or higher scale) -> attach your power adapter.

Measure the voltage to ground of each test point.

[luigi55]

Re: Acer a315-55g-73n7

On pq1 and only on pin 1 19v on the remaining pins of pq1 0v and 0v also on all the other indicated points (2/3/4 etc) Thanks

[mon2]

Re: Acer a315-55g-73n7

Can you measure the voltages on pin #28 of the charger IC? This is the power pin on the charger IC.

Confirm again that REGN pin #24 on the charger IC is 0 volts?

After the above checks, remove all power. Meter in resistance mode.

Check the resistance to ground of the REGN pin on the charger IC.

[luigi55]

Re: Acer a315-55g-73n7

Can you measure the voltages on pin #28 of the charger IC? This is the power pin on the charger IC.

Confirm again that REGN pin #24 on the charger IC is 0 volts?

After the above checks, remove all power. Meter in resistance mode.

Check the resistance to ground of the REGN pin on the charger IC.

I found on 28 19v, on other pins: 5 variable value from 0 to 3v on 6 2.55v on 24 6v

[mon2]

Re: Acer a315-55g-73n7

Power down. Remove the 4k resistor on the ACDRV pin. Do not lose this part.

Power up again. Then carefully measure the voltage to ground on the ACDRV pin.

What is the voltage? It should be ~25v.

[etarcadia]

Re: Acer a315-55g-73n7

Hi there,
I have the same acer "A315-55G-73N7" ,after inserting USB stick it turned off and never turned back on again.
I tryed resetting the bios but to no avail.
Can you help me?

[mon2]

Re: Acer a315-55g-73n7

How did you reset the bios? Reflashed it or the laptop boots to the BIOS screen?

[etarcadia]

Re: Acer a315-55g-73n7

the laptop doesn't start .
When I push power button doesn't work

[mon2]

Re: Acer a315-55g-73n7

Review the attached. With extreme care, with the power adapter connected -> measure the voltage to ground of each highlighted pin.

Post each measurement.

[etarcadia]

Re: Acer a315-55g-73n7

(PU1) Measurement:

pin 3 CMSRC =19,1v
pin 4 ACDRV =24,9v
pin 28 VCC =18,9v
pin 6 ACDET =2,6v
pin 1 ACN =19,1v
pin 2 ACP =19,1v
pin 24 REGN =6v

[mon2]

Re: Acer a315-55g-73n7

These are all good voltage measurements in the shared list.

[etarcadia]

Re: Acer a315-55g-73n7

Can I do other?

[mcplslg123]

Re: Acer a315-55g-73n7

Since mosfet biasing is correct at voltage input and 19V is flowing thru the mb, next step is to check whether you have 3V & 5V on coil and status of 3V LDO.If all is well till here, then check powerbutton has 3V or not and if its present, does de-bounce logic works i.e, 3v goes to zero when power button is pressed and comes back to 3V.

You should make backup of your main bios and flash with a clean me version.

[etarcadia]

Re: Acer a315-55g-73n7

I connected the power to motherboard and to pin n° 1 of fan connector and there isn't 5 volts.
The trace is attached.

[mcplslg123]

Re: Acer a315-55g-73n7

Why you are after the fan at this stage when motherboard is not even turning on? Report back on post#14

[etarcadia]

Re: Acer a315-55g-73n7

Sorry I took wrong way.
I 'll check LDO

[etarcadia]

Re: Acer a315-55g-73n7

Can you help me how to proceed to verify LDO since the electrical diagrams do not fully correspond to my motherboard

[mcplslg123]

Re: Acer a315-55g-73n7

Locate the PWM for 3V and tell us the top markings on it. We can tell you the pin number where you need to measure.