Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-12-2022, 04:48 PM
|
|
Replies: 6
Views: 3,560
Re: Missing RSMRST Signal DA0ZA3MB6E0
Depending on the board architecture it might be absolutely normal to not have 3.3V at SPI FLASH while indeed having 3.3V at the power button. Must not be a issue
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-08-2022, 04:07 PM
|
|
Replies: 18
Views: 321
Re: Alienware 15 R3 Motherboard Issues Help Plz!
Yes yes, rule out all possibilities. Everything you can think off. A new DC-Jack cable might rule it out for sure. I'm pretty interested in the result although it would be hard to source more ideas...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-08-2022, 04:04 PM
|
|
Replies: 2
Views: 97
Re: BD8616 circuit
I think I have a donor board with this charging IC and working main power rail. I'll try to take a look tomorrow.
However, if you're dealing with a P-Channel mosfet, 5V might be perfectly fine....
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-07-2022, 02:23 PM
|
|
Replies: 21
Views: 384
Re: Asus UX330UA won't power on
We're in the wrong direction here. (EDIT: My eyes were lying here. Indeed could be GND (or whatever) after second view)
However, has nothing to do with the issue.
MOSFETs readings confirms your...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-07-2022, 06:19 AM
|
|
Replies: 18
Views: 321
Re: Alienware 15 R3 Motherboard Issues Help Plz!
I would start checking for cold solder joints in the DC-IN circuit. Challenged cracked ferrite beads a few times causing random shutdowns, especially under load. Also a detailed inspection of the...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-07-2022, 02:28 AM
|
|
Replies: 22
Views: 548
Re: LA-C501P No ACDRV??
Also in my opinion I can only think of colder solder joints around at charging controller and surrounding components left. Of course missing or failed resistor possible too.
Especially because we...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-06-2022, 01:12 PM
|
|
Replies: 22
Views: 548
Re: LA-C501P No ACDRV??
ACOK will be pulled up from +3VL in this case so it can't be up if the LDO isn't working.
Imho best bet is to replace the charging IC right now
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-06-2022, 12:53 PM
|
|
Replies: 32
Views: 1,121
Re: ASUS ViviBook X512F no power
New overview necessary since you have 19V at the main power rail now.
Any coil which have voltage? 3.3V at the power button by any chance?
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-06-2022, 03:23 AM
|
|
Replies: 9
Views: 184
Re: Dell la-9832p no charging
Test with known working genuine charger of correct wattage and check your multimeter. Voltages does look indeed to high like mentioned before.
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-05-2022, 04:56 PM
|
|
Replies: 12
Views: 223
Re: Acer Swift SF314-55G, MI4FA MB REV:2.1
To get a better overview we need a full measurement of the charging controller a) with out battery and.b)with battery plugged in. Something must be wrong in charging section or maybe faulty diode...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-05-2022, 04:03 PM
|
|
Replies: 6
Views: 157
Re: help da0x36mbae0 rev e does not turn on
Could be still something after a load switch. Not the first time I would challenge this. Need experience to find the possible culprit or even better with help boardview/schematics. Unfortunately it...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-01-2022, 11:31 PM
|
|
Replies: 23
Views: 388
Re: Asus GA401QM dead, no lights.
Sorry to tell that, but that's likely a dead CPU then. you could check whether the resistance raises or not when Lifting the related coil (the one with 0.17 Ohms) or removing the DrMOS.
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-01-2022, 03:49 PM
|
|
Replies: 3
Views: 196
Re: lenovo G485 Is this cpu shorted?
You're right, this rail runs at very low voltages. But 20V went into the APU through a internal shorted High-Side MOSFET, so yes like already told. The APU is gone
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-01-2022, 03:44 PM
|
|
Replies: 23
Views: 388
Re: Asus GA401QM dead, no lights.
No offense, but something must be wrong with the probes our your multimeter. From typical design of these boards, the 5 most left coils are for GPU Core and I wouldn't expect really more than 1 Ohms...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
08-01-2022, 02:50 PM
|
|
Replies: 23
Views: 388
Re: Asus GA401QM dead, no lights.
Missed the Post where you have mentioned the other voltages present. Sorry for that. :)
30 Ohms sounds pretty high for VCC Vore supply, though. Even when it is a AMD System. We have a Ryzen 7...
|
|
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
07-31-2022, 04:00 PM
|
|
Replies: 23
Views: 388
Re: Asus GA401QM dead, no lights.
I'd be more worried about how the GPU warms up with even no 3.3V present, since DC-IN seems to work perfectly fine. I'd like to know which voltages you measured where.
|
