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Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

Burned Inductors are in my opinion a additional indicator that something is wrong with the DC-IN Jack. The second one could have failed partially too.

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

There are not many possibilities left, since ACER usually don't use something like adapter detection.

Although you already persisted that your setup is okay (which actually makes our assistance here way harder), something should be wrong with your PSU/wires/DC-Plug/DC-Jack. Has to be ruled out one by one in any case.

It can't be a short to GND (or to whatever) since the board does not take any current, as you stated before. And I have big doubts we are dealing with a board issue here with this behaviour.

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

Hello,

I checked and both sides of the coil is 3.3 volts. Please see attached. I noticed PL102 (below PL101) was burned and so I removed. I have not replaced it yet, but 3.3v still remains on both sides of the coils. I also tested continuity from the DC-in jack where it meets the power adaptor and pin 1 that is soldered to the motherboard. Tests fine yet it is measuring 3.3 volts from ground....

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

See attached. Review the raw voltage from the power adapter.

Is it ~19v ?

Then measure the voltage after the EMI coils. Is it still ~19v ?...

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

Thanks for the quick reply.

1. 3v
2. 0v (+19VB)
3. 3.3v (+19V_VIN)

This is consistent with the 3.3v coming from the main AC-in pin and I'm for sure getting 19.5v from the power supply.

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

See attached. Review the VCC (power) pin # 28.

Nearby should be a 3 pin dual common cathode diode.

Attach your power adapter.

Measure voltage to ground of each pin. Post the measurements....

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

Hello, here are the voltages. A lot of these seem very low.

1. 0v
2. 0v
3. 0.290v
4. 0.270v
5. 0v
6. 0.410v
7. 0.010v

8. 0.250v
9. 0.530v
10. 0v
11. 0.020v
12. 0.010
13. 0v
14. 0v

15. 0.010v
16. 1.280v
17. 0.141v
18. 0.900v
19. 0.133v
20. 0.133v
21. 0.490v

22. 0v
23. 0v
24. 0.375v
25. 0.470v
26. 0.152v
27. 0.141v
28. 3.09v

Re: Acer Nitro 5 AN517-52-5744 - Not Powering On

You are measuring -15v ? There should not be any negative voltage rails on the power paths. Only the rs232 transceiver charge pump will have ~6 volts with a positive and negative swing.

Review the voltage to ground of each pin on the charger IC at PUB1. Connect both the power adapter and the battery.

Post the measurements and their pin numbers.