Hello,
I have an Intel NUC10FNK with a shorted main rail.
Board model is 7170166-5
The device came in with no power issue. The plus pin of the dc jack had 0Ohms resistance to ground.
I checked the first mosfet, it was shorted, after removing the first mosfet, the short is gone on the source side on the board, but remains on the drain side.
I could not find a second mosfet, other than a dual mosfet on the other side of the board, but that is not shorted.
For test I injected 1V 3A on the drain of the first mosfet (mosfet removed from board). But...
johnbeton
Senior Member
Last Activity: 02-21-2026, 09:17 AM
Joined: 06-14-2021
Location: Hasselt
-
Fixed !
The jumperwire did the trick.
Thanks for everyone who guided me. -
Indeed the resistance of the circuit should be zero, but it is 17.5KOhm.
I understand the 10k resistor has nothing to do with the connection between mosfet gate and charging controller. But it is easier for me to solder a jumper wire to pin 1 of the resistor than on the gate of the mosfet. (since these pins are in the same circuit).
Anyway I'm going to jump this with a wire and testLeave a comment:
-
hi, I already changed them but no result, I started measuring all over, and noticed I have 5.87V at PT8901, but only 0.9V at the gate of PQH8902 and pin 1 of PR8969.
The resistance between PT8901 and the mosfet and resistor is 17,5KOhm.
If i'm not mistaken in reading the schematic and boardview this should be a direct trace with very low resistance.
Is it safe to make a bridge between PT8901 and pin 1 of the resistor or to the gate of PQH8902 ?...Leave a comment:
-
I replaced the charging controller, but the problem remains, I also ordered yet another battery, because the other 2 stay a 0 volt.
The new battery came in and had 7.56V, according to the system the battery is charged for 53%.
With the charger plugged in, the charging led goes orange, as if it is charging, but the battery percentage stays steady, the voltage on the battery connector goes up very slow.
With the charger unplugged the battery drains like normal.Leave a comment:
-
With black probe on drain and red probe on source I have 9,89 KOhm on 1 mosfet, and 11,73 KOhm on the other mosfet.
All other combinations (reverse probes, source - gate, drain - gate, ....) are OL.
I also tested in diode mode:
Black probe on drain, red probe on gate. Then black on drain, red on source gives 0 Ohm.
Put black probe on gate, closes the mosfet.Leave a comment:
-
I removed the mosfets and checked them off the board, they seem to be fine, but just to be sure, I replaced them with equivalent mosfets, but the problem remains.
Maybe the controller itself is bad ? I have a donor board with the same controller, I could try exchange the controller.Leave a comment:
-
Highside
Source / drain (black probe on drain) = starts at 2.89 MOhm and going up while I measure
Source / drain (red probe on drain) = 0.00 Ohm
source / gate = 9.9 KOhm
Gate / drain = 1.4 MOhm and going up while I measure
Lowside
Source / drain = 4.9 MOhm
source / gate = 0.21 MOhm
Gate / drain = 1.8 MOhm and going up while I measure​Leave a comment:
-
I checked them on shorts, but no shorts, and have 19V past botch mosfets, is this ok ?...Leave a comment:
-
Both batteries are completely empty.
The resistance from the + pin to PRS8903 is 1.1 Ohm on one side, 11.1 Ohm on the other side.
PJP8901 is present and is indeed a solder blob.
Edit: one thing I noticed on PD8900 I have 19V on Pin 2 and 3, and 2.9V on Pin 1. Don't know if this is normal ?Leave a comment:
-
Resistance between pin 1 & 2 on charger IC = 1.1 Ohm
Resistance between SRN & SRP on charger IC = 21.2 Ohm
PR8968 = 10.4Ohm
Thanks for the link to boardviewLeave a comment:
-
The resistor is 4.02KOhms, I have 19V on pin 1 and 18.55V on pin 2
I checked the first mosfets for short, but they are not short. There was no water in the area of the EC.Leave a comment:
-
i'm sorry, I checked again, and PIN1 is also 19.02V, i must have made an error in my first measurement.Leave a comment:
-
Asus X415EA not charging battery
Hello,
I have an Asus X415EA board that is not charging the battery after some liquid damage. Everything else works, except charging the battery.
So far I measured all the pins on the bq24780s controller with the following result:
1. ACN = 0.0V
2. ACP = 19.02V
3. CMSRC = 18.5V
4. ACDRV = 23.9V
5. ACOK = 5.9V
6. ACDET = 2.57V
7. IADP = 0.17V
8. IDCHG = 0V
9. PMON = ?
10. PROCHOT = 5.05V
11. SDA = 3.3V
12. SCL = 3.3V
13. CMPIN = 0.47V
14. CMPOUT = 6.0V
15. BATPRES = 0.0V
16.... -
I was afraid for that, so this one is unrepairableLeave a comment:
-
HP EPK50 LA-G07EP short on +3VALWP and +1.0V_PRIMP
Hello,
Working on a board HP EPK50 LA-G07EP. Owner tried to replace LCD display without disconnecting battery. Afterwards, the notebook turns on for a few seconds and shuts off.
Mainrail looks fine, battery charges. I have +5VALWP, but that's it.
I measure short to ground (0.03Ohms) on +3VALWP and +1.0V_PRIMP.
Injecting 1v at 3A on PL1001 and PL302 only slightly warms up the cpu after several minutes. -
Hello,
What is the background of the laptop ? How did it fail?
Best start is to check for short to ground on every coil of the mainboard.Leave a comment:
-
thanks a lot !Leave a comment:
-
long shot, but don't know if anyone has this boardview or schematic ? Or maybe some ideas how to diagnose this board.
Touching some areas make the leds go on, but when I touch ground with the other hand, the leds go off.
What could be a cause of this ?Leave a comment:
-
it looks to be a 0603, I will order some of these and try, thanks a lot for your guidance and advise.Leave a comment:
No activity results to display
Leave a comment: