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Search: Posts Made By: Sephir0th
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:08 AM
Replies: 2
Views: 54
Posted By Sephir0th
Re: Y740 short through PCB, missing vccsa.

This wouldn't even cover the inner layers. A picture of how it actually looks like would be helpful.

And is the VRM circuit even confirmed good at least from resistance measurements? Usually a CPU...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-14-2022, 09:07 AM
Replies: 1
Views: 48
Posted By Sephir0th
Re: where does the KBC gets its power from?

Depends on the Controller. Some will release VREG3 immediately after getting power and some need a dedicated Enable.
And no, usually the EC doesn't get power from the 3.3V Coil but from a LDO, often...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-14-2022, 02:46 AM
Replies: 5
Views: 167
Posted By Sephir0th
Re: Ideapd 5 15ITL05 wont charge battery

That's a interesting attitude. Good luck by solving your fault. :)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-14-2022, 02:45 AM
Replies: 57
Views: 723
Posted By Sephir0th
Re: Alienware 15 R3 Motherboard Issues Help Plz!

Nobody noticed? From measurements one of your DC-IN MOSFET is internal shorted sind ACDRV doesn't reach 25V. Should be easy to solve from here.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-12-2022, 04:48 PM
Replies: 6
Views: 3,580
Posted By Sephir0th
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 08-12-2022, 04:43 PM
Replies: 11
Views: 213
Posted By Sephir0th
Re: Lenovo ThinkPad L13 18834-1M strange fault

Guys, what are you doing here? The PCH is already confirmed bad.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2022, 03:10 PM
Replies: 57
Views: 723
Posted By Sephir0th
Re: Alienware 15 R3 Motherboard Issues Help Plz!

Forget about it. Even when it has a slight crack it should be still full functional.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-08-2022, 04:07 PM
Replies: 57
Views: 723
Posted By Sephir0th
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: 105
Posted By Sephir0th
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 08-08-2022, 01:03 PM
Replies: 11
Views: 213
Posted By Sephir0th
Re: Lenovo ThinkPad L13 18834-1M strange fault

Check the PCH for heating up when injecting. With 2 - 3A you should feel something.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-08-2022, 04:54 AM
Replies: 6
Views: 163
Posted By Sephir0th
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-07-2022, 02:23 PM
Replies: 21
Views: 399
Posted By Sephir0th
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: 57
Views: 723
Posted By Sephir0th
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: 576
Posted By Sephir0th
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, 04:49 PM
Replies: 5
Views: 167
Posted By Sephir0th
Re: Ideapd 5 15ITL05 wont charge battery

Start with checking the DCIN mosfets for being internal shorted.

BIOS request goes into another category here iirc
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-06-2022, 01:12 PM
Replies: 22
Views: 576
Posted By Sephir0th
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: 1,142
Posted By Sephir0th
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, 06:30 AM
Replies: 2
Views: 97
Posted By Sephir0th
Re: just repaired an Inspiron 15 Gaming 7567 with the ‘ACPI BIOS ERROR’

Beside the burned Ferrite bead could indeed cause an issue it sounds more like it was revived by doing a BIOS hard reset.

Pictures of the location would be interesting especially whether there are...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-06-2022, 03:23 AM
Replies: 9
Views: 194
Posted By Sephir0th
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: 232
Posted By Sephir0th
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, 04:38 PM
Replies: 7
Views: 180
Posted By Sephir0th
Re: Acer ES1-571 Winstron no display

A) Detailed visual inspection fur burned components

B) CapsLock test with external keyboard
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-05-2022, 04:03 PM
Replies: 6
Views: 162
Posted By Sephir0th
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 08-04-2022, 03:54 PM
Replies: 2
Views: 115
Posted By Sephir0th
Re: Asus TUF Gaming F15? Is this worth fixing? PCH WARM

I guess 3.3V is present then. Anything else coming up, even when it's for a short while? Check the coils and summarize pls.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-04-2022, 03:31 PM
Replies: 6
Views: 162
Posted By Sephir0th
Re: help da0x36mbae0 rev e does not turn on

What is the question? When Inputs and Enable are fine you need to check the load side.

Resistance to GND at LDO3 and LX?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-01-2022, 11:31 PM
Replies: 23
Views: 395
Posted By Sephir0th
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.
Showing results 1 to 25 of 324

 
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