acer a515-52g-4830 5valw 3valw missing

[Kshi]

Confirm that VDD_CHG is present on the one side of PR311. This is important. Measure this voltage to ground.

VDD_CHG to ground is 5v

[Sephir0th]

Best bet is to replace the charging controller i would say since nothing else is off at this point.

Fingers are crossed

[Kshi]

Ordered new charging IC, I will update you guys when I replaced it. Thank you for helping me

[Kshi]

Update: Replaced charging ic but still the same🥲 also replace 1st and 2nd mosfet

[mon2]

Carefully measure the voltage to ground on each pin of the charger IC and post each here in a table with pin # and function name for a review.

[Kshi]

Carefully measure the voltage to ground on each pin of the charger IC and post each here in a table with pin # and function name for a review.

1-ACIN 4v
2-ACOK 0.06v
3-SDA 0v
4-SCL 0v
5-PROCHOT# 0v
6-AMON 0v
7-BMON 0v
8-AGND 0v
9-PROG 0v
10-COMP 0v
11-CCLIM 1.6v
12-FSET 0V
13-BATGONE 0v
14-CSON 0v
15-CSOP 0v
16-ACLIM 1.3v
17-NTC 0.9v
18-DCIN 18.7v
19-VDD 5.2v
20-VDDP 5.2v
21-LGATE 0v
22-PHASE 0v
23-UGATE 0.1v
24-BOOT 4.8v
25-BGATE 0v
26-VBAT 0v
27-QPCP 4.8v
28-OPCN 0v
29-CMSRC 0v
30-ASGATE 0v
31-CSIN 0v
32-CSIP 0v

[mon2]

Remove all power. Meter in resistance mode. Confirm that you have a resistor @ PR311. Measure the resistance across this resistor.

Confirm you have a resistor @ PR313. Confirm the resistance across PR313.

Confirm that PR311 is mated to pin # 19 of this charger IC @ PU301. This is the pull-up voltage rail.

Together, PR311 & PR313 build a voltage divider and will offer a parking voltage on ACOK pin IF the adapter voltage is considered to be OK. The ACIN pin #1 voltage is high enough so ACOK should offer a valid voltage. If ACIN is too low, then ACOK will be pulled low but do not believe this is the case. Rather, suspecting that the external resistors or soldering is missing for PR311.

Confirm it.

[Kshi]

PR311 74K
PR313 93K
PR311 have continuity to pin#19

[mon2]

This should be ok. Have you used the same part for the replacement for PU301?

What should happen here is that the ACIN voltage on pin #1 must be at a specific voltage or higher. This is the voltage from the power adapter. You are at 4v and this should be ample to consider the adapter to be at a suitable voltage. Then ACOK pin # 2 should be floating or open-drain (like an open switch). Then these external resistors will create a lower but safe voltage to apply onto the floating pin #2 line. This floating voltage will then enable other mosfets on the board (2N7002) to perform their task.

Are you comfortable with the soldering of PU301? Consider to reflow it if in doubt. Flux & reflow to be sure that there are no shorts linked to pin #2.

The alternate theory is that the voltage on pin #1 is too low and for this reason, pin #2 is being pulled to a low voltage to indicate the power adapter is NOT suitable. For now, do not believe this is the fault.

Remove all power. Measure the resistance to ground of pin #2 on the charger IC. We are testing for any possible shorts. Perhaps your PR313 measurement above is the same measurement?

Sorin is working on the same unit(?) here:

https://www.youtube.com/live/9MB34gNQceQ

Be sure your pin #1 on the charger chip is correct.

[mon2]

ACIN is a bit higher than the calculator shows but do not believe this should be an issue. The full datasheet for this charger IC is not public so not 100% sure if the adapter voltage is considered to be too high or not.