acer nitro 5 not working on battery mode

[yaso143]

hello i have a issue in a acer nitro 5 laptop is turning on using the charger charging light turns on and when you remove the charger the laptop turns off i also replace it with a known good battery but still same issue

do you have any ideas what part of the board i should look

[mon2]

Re: acer nitro 5 not working on battery mode

Hey. Recently returned from Davao. Always wanted to go zip lining - got a chance to do this at Eden Park. Wife was not happy.

Review the sticky above by @Piernov on chargers. Respectively inspect the first 2 dcin mosfets that follow the power adapter connector. Often these mosfets will become defective. Remove all power. Meter in resistance mode. Check the resistance across :

Source & drain
Source & gate
Gate & drain

A low resistance means the mosfet is leaky and needs to be replaced.

[yaso143]

Re: acer nitro 5 not working on battery mode

Yes it's the first mosfet s-d 0hms s-g 1.2ohm d-g 1.2ohms

Btw the mosfet is a Nikos pk5n2ea what mosfet can i use for substitute I can't find any sources online

[mon2]

Re: acer nitro 5 not working on battery mode

1) must be N-channel type
2) source drain voltage should be 30v or higher
3) physically the same size as the original
4) be able to support high current so look for a low resistance on Rds value

Donor boards are an option of alternative parts.

Here is someone selling out of Manila but is expensive:

https://www.lazada.com.ph/products/5...&pdpBucketId=8

[yaso143]

Re: acer nitro 5 not working on battery mode

1) must be N-channel type
2) source drain voltage should be 30v or higher
3) physically the same size as the original
4) be able to support high current so look for a low resistance on Rds value

Donor boards are an option of alternative parts.

Here is someone selling out of Manila but is expensive:

https://www.lazada.com.ph/products/5...&pdpBucketId=8

Thnks really appreciate the help

[yaso143]

hello just an update on this the unit is now working on battery mode but when i plug the charger both blue light and amber light blinks and the laptops shows it charger then the charge indicator disappear in windows
the amber light and blue light blinks i have replaced the high side and lowside mosfet and the bq chip still same issue do you have ideas or how would you approach this kind off issue

[mon2]

Check the usual 2*Dcin mosfets that are between the power adapter and the charger IC. Check the voltage to ground of each pin of these mosfets.

source (1-2-3)
gate (4)
drain (5-6-7-8)

post each measurement.

[yaso143]

1st mosfet without battery + dc in (Source 20v Gate 26v Drain 20v ) 2nd mosfet without battery +dc in(source 20v gate 26v drain 20v)
1s mosfet with battery +dc in (source 0.7v drain 20v gate 0.7v )(2nd mosfet with batter +dc in (source 0.7v drain 15.94v gate 0.9v) both amber light ang blue light blinks but the unit turns on and works but its not charging the laptop