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Search: Posts Made By: piernov
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Today, 04:10 AM
Replies: 3
Views: 43
Posted By piernov
Re: MacBook Air A1466 820-3437

3437 (2013 model) doesn't have the 16GB configuration. The SPD profiles may be missing from the EFI.
00165 (2015 model) has the 16GB configuration on the other hand. For those (and 00164),...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Today, 02:17 AM
Replies: 3
Views: 43
Posted By piernov
Re: MacBook Air A1466 820-3437

Yeah the easiest would be to get the part numbers from an actual 8GB board variant. That way you can also confirm the strapping resistor arrangement. (it's listed in the schematics but it may not be...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Today, 02:14 AM
Replies: 6
Views: 106
Posted By piernov
Re: Liquid damage. Charging circuit short. Runs fine without battery.

Good job.
When the PCB burns, it becomes conductive so you also need to remove the burnt PCB material. Sometimes you even have to dig a crater through the board to remove all the burnt stuff. You...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 03:02 AM
Replies: 6
Views: 106
Posted By piernov
Re: Liquid damage. Charging circuit short. Runs fine without battery.

Yes AON7401 for PU4403 should work fine.
For the capacitor you can go same or higher voltage, but in general you'd need to more or less match the capacitance and ESR (so the number of capacitors in...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 02:17 AM
Replies: 8
Views: 97
Posted By piernov
Re: Dell e5440 turns on but the screen remains black

Make sure RAM is good and compatible, and that you tried disconnecting any devices.
If CPU VCore is present, try to flash the BIOS.
Don't mess with the GPU or the CPU themselves randomly.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-18-2019, 04:06 PM
Replies: 6
Views: 106
Posted By piernov
Re: Liquid damage. Charging circuit short. Runs fine without battery.

That PCB doesn't look in good shape... What happened to it? If it's burnt just below PQ4201 label then that might be causing your short...
Easy way of finding a short is inject voltage and find the...
Forum: Schematic Requests ONLY! 06-18-2019, 03:58 PM
Replies: 2
Views: 286
Posted By piernov
Re: Need:macbook pro A1990 boardview+schamtic

820-01041 not available yet. Have to be patient.
Only the 13" leaked for now, 820-00850, but no one shared it for free yet apparently.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-18-2019, 02:12 AM
Replies: 2
Views: 66
Posted By piernov
Re: ACER Notebook Spin 7

Replace the high-side MOSFET that feeds the battery charging rail from B+
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-16-2019, 04:38 AM
Replies: 6
Views: 114
Posted By piernov
Re: 19v power not passing through

Check if the DC-in MOSFETs are shorted, common issue.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-15-2019, 03:39 PM
Replies: 9
Views: 346
Posted By piernov
Re: Apple 820-3115 b not posting - shorted cpu?

I don't know the exact figures but above 2 ohms isn't alarming. Exact figure will depends on board, CPU model, temperature and may even vary from board to board.
Usually Ivy Bridges have pretty low...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-15-2019, 05:28 AM
Replies: 9
Views: 147
Posted By piernov
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-13-2019, 05:41 AM
Replies: 3
Views: 103
Posted By piernov
Re: Imac A1311 Lcd problem

One is 2009 and the other is 2010. Not sure if they are compatible. Knowing Apple, probably not.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-13-2019, 02:50 AM
Replies: 5
Views: 133
Posted By piernov
Re: Lenovo Yoga 710-11ISK Only White Light

PL601 is probably CPU VCore and PL603 is probably VCCGFX.
If it really doesn't seem to boot nor POST, try to flash the BIOS.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-12-2019, 12:18 PM
Replies: 5
Views: 67
Posted By piernov
Re: HP 15-AC135NA Dead

Check voltage on the AD_ID pin, the one connected to the center pin of the AC adapter. One of the 3 bottom pins of PJP1 not sure which one, maybe brown wire. (measure all 3 if unsure)
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-12-2019, 11:31 AM
Replies: 5
Views: 67
Posted By piernov
Re: HP 15-AC135NA Dead

Do you get white LED next to DC-in connector?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-11-2019, 03:18 PM
Replies: 11
Views: 118
Posted By piernov
Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it canīt turn on yet

If you get 19V on PQ31 source then you should be getting 19V too on CSSN/CSSP.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-11-2019, 10:28 AM
Replies: 11
Views: 118
Posted By piernov
Re: dell vostro 3450 was turning off ac adaptor. I fixed it but it canīt turn on yet

I'm a bit confused about the measurements, as if PQ31 has 19V on source then gate must be either 19V (in case MOSFET is shorted) or 1.7V (due to the voltage divider).
Anyway, if you have 19V getting...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-11-2019, 03:13 AM
Replies: 1
Views: 59
Posted By piernov
Re: macbook a1534 2015 no ssd

Usually bad CPU. You can try to reball CPU but it is pretty difficult. (especially on 820-00045 since the CPU has a daughter PCB under it…)

Those A1534 are garbage, CPU are failing all the time,...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-07-2019, 02:58 AM
Replies: 5
Views: 108
Posted By piernov
Re: Z5WAH LA-B162P keeps burning its PU401 IC

No short to ground on +3VLP, +3VALW or any derived rail?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-07-2019, 01:29 AM
Replies: 3
Views: 70
Posted By piernov
Re: Hp 15-quanta y11 no display

Y11A :(
What's the voltage on CPU VCore and PLTRST#?

EDIT: ah nice, how did you find out it was wrong BID?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-03-2019, 12:31 PM
Replies: 3
Views: 105
Posted By piernov
Re: MacBook Pro A1398 (Retina, 15-inch, Mid 2015) 820-00163-A crashes at half boot sc

Try known good battery first. This model may need a good battery to boot. (820-00426 needs one for sure)
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-02-2019, 12:45 PM
Replies: 6
Views: 79
Posted By piernov
Re: 820 2936 chimes, backlight present but lcd is black

Try PRAM reset and try with external display.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-02-2019, 12:32 PM
Replies: 6
Views: 79
Posted By piernov
Re: 820 2936 chimes, backlight present but lcd is black

You waited for like a minute or so?
Try a USB drive with macOS on it and check if its activity LED blinks.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-02-2019, 04:54 AM
Replies: 7
Views: 150
Posted By piernov
Re: MSI MS-16JB1 no VCC_GT voltage

CS# will go low only when the BIOS chip is being read. Checking this signal with the oscilloscope is a good way to know if the BIOS is being read. If you have a fast multimeter, you may see it...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-31-2019, 03:19 AM
Replies: 37
Views: 8,291
Posted By piernov
Re: HP DV6 2130ec

Yeah probably the northbridge, RS780M or RS880M fail a lot. Heat can indeed make them work for a short time, no need to reflow just 200°C is enough. It has to be replaced as it will fail again very...
Showing results 1 to 25 of 500

 
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