Asus X415JA rev 3.1 no turn on

[timo667]

I have a problem with Asus X515JA-BQ2634W. The motherboard model is X415JA rev 3.1. The laptop got water-damaged around the EC (IT5125E-128), IO connectors, and the audio area on the opposite side of the PCB. After cleaning up the water damage and reflowing the EC, the laptop started turning on, and everything worked correctly. However, after two days, it suddenly stopped turning on. Now, when connected to the power supply, it draws around 0.01A. On the motherboard, I have measured voltages of 3V and 5V, as well as LDO3 and LDO5, generated by the Richtek RT8249C (2N=). Additionally, I have identified a coil where 1.8V appears when the power supply is connected. All coils show the correct resistance on a multimeter. Due to the water damage around the EC, I removed it to check if there were any traces underneath, but all connections seemed fine. The BIOS has been reprogrammed. Can anyone suggest where to look for the problem?

[mon2]

Re: Asus X415JA rev 3.1 no turn on

The board is not consuming any current at a 10mA draw. Check the adapter voltage at the dc connector and continue to trace the same input power rail to the 2*DCin mosfets. Likely these are not turning on.

Measure the voltage to ground of:

Source (1-2-3)
Gate (4)
Drain (5-6-7-8)

Pins of each mosfet. Post each measurement.

[timo667]

Re: Asus X415JA rev 3.1 no turn on

On DC Connector have 19V

on first mosfet (Code SMD: E120AT I think is RQ3E120AT)
Measured the voltage to ground of:

Source (1-2-3) 19V
Gate (4) 12,4V
Drain (5-6-7-8) 19V

on second mosfet (Code SMD: E120AT I think is RQ3E120AT)
Measured the voltage to ground of:

Source (1-2-3) 19V
Gate (4) 12,5V
Drain (5-6-7-8) 19V

Intersil 9238CH
Measured the voltage to ground of:

1. 8,4V
2. 8,4V
3. 8,4V
4. 5,08V
5. 5,08V
6. 0V
7. 0V
8. 5,08V

9. 0,11V
10. 8,4V
11. 8,47V
12. 13,3V
13. 8,3V
14. 19V
15. 19V
16. 19V

17. 18,7V
18. 5,08V
19. 0,86V
20. 0,12V
21. 3,3V
22. 3,3V
23. 0V
24. 5,08V

25. 0V
26. 5,02V
27. 0V
28. 1,43V
29. 0V
30. 0V
31. 0V
32. 8,4V


Richtek RT8249C (2N=)
Measured the voltage to ground of:

1. 0V
2. 0V
3. 3,3V
4. 0,1V
5. 0V

6. 3,3V
7. 0V
8. 3,3V
9. 8,2V
10. 3,56V

11. 0,28V
12. 8,4V
13. 5,13V
14. 5,14V
15. 0,05V

16. 5,21V
17. 9,75V
18. 5,14V
19. 0V
20. 3,3V


All measured voltage was after plug the power supply to dc connector.

[timo667]

Re: Asus X415JA rev 3.1 no turn on

Managed to fix the laptop, the issue was the lack of voltage on the 3VSUS_PWRGD line on 67 Pin EC, after fixing this voltage, the laptop started to boot up.

[maksimthuk]

Re: Asus X415JA rev 3.1 no turn on

Managed to fix the laptop, the issue was the lack of voltage on the 3VSUS_PWRGD line on 67 Pin EC, after fixing this voltage, the laptop started to boot up.

Hello. What did you do to make the tension appear on 67 Pin EC?

[elrahmat]

Re: Asus X415JA rev 3.1 no turn on

On DC Connector have 19V

on first mosfet (Code SMD: E120AT I think is RQ3E120AT)
Measured the voltage to ground of:

Source (1-2-3) 19V
Gate (4) 12,4V
Drain (5-6-7-8) 19V

on second mosfet (Code SMD: E120AT I think is RQ3E120AT)
Measured the voltage to ground of:

Source (1-2-3) 19V
Gate (4) 12,5V
Drain (5-6-7-8) 19V

Intersil 9238CH
Measured the voltage to ground of:

1. 8,4V
2. 8,4V
3. 8,4V
4. 5,08V
5. 5,08V
6. 0V
7. 0V
8. 5,08V

9. 0,11V
10. 8,4V
11. 8,47V
12. 13,3V
13. 8,3V
14. 19V
15. 19V
16. 19V

17. 18,7V
18. 5,08V
19. 0,86V
20. 0,12V
21. 3,3V
22. 3,3V
23. 0V
24. 5,08V

25. 0V
26. 5,02V
27. 0V
28. 1,43V
29. 0V
30. 0V
31. 0V
32. 8,4V


Richtek RT8249C (2N=)
Measured the voltage to ground of:

1. 0V
2. 0V
3. 3,3V
4. 0,1V
5. 0V

6. 3,3V
7. 0V
8. 3,3V
9. 8,2V
10. 3,56V

11. 0,28V
12. 8,4V
13. 5,13V
14. 5,14V
15. 0,05V

16. 5,21V
17. 9,75V
18. 5,14V
19. 0V
20. 3,3V


All measured voltage was after plug the power supply to dc connector.

Is pin number 6 of the IC 9238ch connected to ground? because when I open the datasheet, it's not ground?