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Search: Posts Made By: Sephir0th
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-07-2022, 05:14 PM
Replies: 1
Views: 269
Posted By Sephir0th
Re: asus x441uv pwm vcore ATK1502BC

already confirmed, the board is not posting? You can get pinout from X556UV boardview.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-07-2022, 05:06 PM
Replies: 5
Views: 455
Posted By Sephir0th
Re: Fujitsu Lifebook E544

Check all Pins to GND. Usually each measurement should be in KiloOhms range. If everything seems fine, the issue might be behind a load switch, or the load-switch itself
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-14-2021, 04:29 PM
Replies: 25
Views: 1,633
Posted By Sephir0th
Re: Notebook TERRA MOBILE 1541H

Open the Laptop, visual inspection, Voltage at all coils present? If yes, I'd indeed start with BIOS Firmware.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-14-2021, 04:21 PM
Replies: 12
Views: 855
Posted By Sephir0th
Re: Latitude E7450 LA-A961P no power intermittent

13.6V at Pin 8 of PU300, the 1.05V Controller, should be normal, since it is NVDC Design. Means more or.less, Main Power Rail is battery rail at the Same time.

You already found out that a...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-21-2021, 02:18 AM
Replies: 13
Views: 745
Posted By Sephir0th
Re: Dell precision 7250

This mosfet should Not beep or Show Low Ohms in any Case. If so, Remove it and Check the empty Pads again. If confirmed, replace it. The issue might be solved after.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-20-2021, 02:49 AM
Replies: 5
Views: 522
Posted By Sephir0th
Re: HP 15 day11amb6e0 y11a Shutdown Issue

You're talking about U16? Probably not present because a optional component.

Which PGood exactly is missing? H_PROCHOT# low or high?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 12:38 PM
Replies: 5
Views: 522
Posted By Sephir0th
Re: HP 15 day11amb6e0 y11a Shutdown Issue

The fault must be earlier in the sequence. Find Out what exactly is Missing should give the clue. Of course, Schematics will Help a lot Here.
And it Would be also a good start to Check whether PGood...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 11:13 AM
Replies: 13
Views: 745
Posted By Sephir0th
Re: Dell precision 7250

Do you know how to Check these mosfets?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 09:06 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

So it is indeed +SDC_IN which is shorted. Still PU401 und PU701 Most suspicious in my opinion
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:58 AM
Replies: 13
Views: 745
Posted By Sephir0th
Re: Dell precision 7250

Then Share clear Pics of the DC-IN Circuit. At least Mosfets and the Charging Controller should be visible.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:55 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

Once i Had a partial shorted 5V Rail which was also drawing almost nothing. However the VRM Controller got Mad hot. Case solved.

But yeah i won't expect a massive consumption.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:49 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

That's fine then. So Voltage injection Like mentioned before. Pay Attention especially To PU401 and PU701.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:35 AM
Replies: 13
Views: 745
Posted By Sephir0th
Re: Dell precision 7250

Check BatFet and Share Schematics pls, If available
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:20 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

20 Ohms are probably Bad News. Now you have to Check Resistance to GND of each coil. Look for a similar value...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 08:15 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

First, Share exact Résistance to GND there in Ohms Mode, Range 200 or Auto-Range to exclude a Short with a step down Circuit.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 07:20 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

PU701 Pin 6 & 15 short to GND means Main Power Rail short to GND. How could that Be missed before?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 06:09 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

Unfortunately i can't find datasheet right no for PU701, but you can at least check whether 19V reach Pin1 and of course, you can check each pin for short to GND
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-19-2021, 05:02 AM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

Ok. So it seems most of the parts on the supicious rail were checkd, except PQ5 and PU701, right?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-18-2021, 04:05 PM
Replies: 5
Views: 593
Posted By Sephir0th
Re: NM-A381 Lenovo yoga 3 14 no power

Once i Had both USB Switches and the VRM Controller bad causing Low resistance to GND at 5V Rail in this Board. You might be lucky but can be a rabbit hole too.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-18-2021, 03:52 PM
Replies: 67
Views: 3,016
Posted By Sephir0th
Re: Dell E5440 completely dead

Afaik PL5 should Show short to GND at both Sides. What is the internal resistance of PL5.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-27-2021, 02:39 PM
Replies: 13
Views: 1,374
Posted By Sephir0th
Re: Lenovo Ideapad 330S-14IKB Not Powering On

It's the Controller 99,99%. Replace it. Everything Else Looks fine now.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2021, 05:37 AM
Replies: 5
Views: 484
Posted By Sephir0th
Re: Lenovo Z500 no power

Show on a Pic for what you're looking.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2021, 04:47 AM
Replies: 11
Views: 733
Posted By Sephir0th
Re: ASUS GL504GM - no 3.3/5V, bad charger ic

In my opinion this is neither a Charging IC nor 3V/5V Controller.

EDIT: So the wrong Datasheet was shared before. Didn't checked that. This explains a lot
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2021, 03:51 AM
Replies: 7
Views: 742
Posted By Sephir0th
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2021, 03:24 AM
Replies: 11
Views: 733
Posted By Sephir0th
Re: ASUS GL504GM - no 3.3/5V, bad charger ic

Probably not, what you are looking for. Usually It isn't that hard to find the right Controller or Maybe two of them in Case of Silergy solution (for example). And you're experienced Afaik.

Clear...
Showing results 1 to 25 of 290

 
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