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Search: Posts Made By: piernov
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Today, 06:45 AM
Replies: 2
Views: 38
Posted By piernov
Re: Asrock b250 gaming k4 no voltage igpu but still display image

https://logi.wiki/index.php/User:Piernov#I_am_missing_VCCAXG.2FVCCGFX.2FVCCGT_.28iGPU_core_voltage.29.2C_how_do_I_solve_it.3F
Forum: Schematic Requests ONLY! Yesterday, 09:03 AM
Replies: 3
Views: 82
Posted By piernov
Re: 820-02100 and 820-02382 bvr and sch files

Same board outline fix as for 820-2098/820-02443, who knows why it's not the same as before.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 02:57 AM
Replies: 9
Views: 281
Posted By piernov
Forum: BIOS Requests ONLY! 09-28-2022, 10:53 AM
Replies: 5
Views: 3,385
Posted By piernov
Re: BIOS guides, methods, resources and tools Discussions

Thanks, added a link to it. Feel free to write a post with any info you want to add.
Forum: Schematic Requests ONLY! 09-26-2022, 05:33 AM
Replies: 13
Views: 25,140
Posted By piernov
Re: Need A1708--820-00840-01 schematic with boardview

I pointed it out multiple times but people do not read.
Moved posts to the existing 00875 thread and deleted the renamed files.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-24-2022, 05:20 AM
Replies: 12
Views: 190
Posted By piernov
Re: MacBook pro, 820-2610-A, X5R capacitors

They are "normal ceramic SMD caps". They are used on most electronics devices. Y5V is used when the manufacturer is cheaping out.
Y5V have much worse temperature coefficient than X5R so that's why...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 02:35 PM
Replies: 12
Views: 190
Posted By piernov
Re: MacBook pro, 820-2610-A, X5R capacitors

Avoid Y5V. X7R will of course be fine in place of X5R. Other ratings are much rarer. X5R is very common.
Pretty standard values so shouldn't be difficult to find on a donor board. Having a matching...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-22-2022, 02:29 AM
Replies: 14
Views: 198
Posted By piernov
Re: Lenovo Thinkpad T480 no charging

TPS65988DH and TPS65988CE pinouts are not compatible. Refer to schematics.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-21-2022, 05:17 AM
Replies: 40
Views: 538
Posted By piernov
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-20-2022, 03:34 PM
Replies: 6
Views: 153
Posted By piernov
Re: HP Dv7 da0lx8mb6d1 rev:D No display

They always resurrect for a short while after heating to 200C for a minute and a half. It'll fail again, usually in less than a few months, sometimes it lasts only a few reboots.
Need to replace...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-20-2022, 03:47 AM
Replies: 6
Views: 248
Posted By piernov
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2022, 03:49 PM
Replies: 2
Views: 84
Posted By piernov
Re: capacitor stock for repair shop

Indeed capacitors are generally 20% tolerance, and capacitance measurement in a DMM is not necessarily very accurate. However if they are very close to the 20% tolerance bounds (so very close or...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-19-2022, 03:45 PM
Replies: 6
Views: 153
Posted By piernov
Forum: Schematic Requests ONLY! 09-16-2022, 12:00 PM
Replies: 6
Views: 322
Posted By piernov
Re: 820-02098 and 820-02443 brd and sch files

OpenBoardView supports BVR3 files.
Here are the original BRD files anyway.
Forum: Schematic Requests ONLY! 09-16-2022, 02:49 AM
Replies: 60
Views: 12,767
Posted By piernov
Re: Macbook Air A2337 Schematic & SilkScreen 820-02016 Schematic & SilkScreen (Prov

BVR3 format has been supported in OBV for several months now.
Forum: Schematic Requests ONLY! 09-14-2022, 02:49 PM
Replies: 6
Views: 6,786
Posted By piernov
Re: OpenBoardView opensource boardview software for .brd

Bugs should be reported on the Github Issues page.
C++11 support was broken (some changes needed C++17), that's fixed but obsolete unsupported systems should not be used anyway.
Forum: Schematic Requests ONLY! 09-14-2022, 10:44 AM
Replies: 6
Views: 322
Posted By piernov
Re: 820-02098 and 820-02443 brd and sch files

Thanks.

Semantics on the points outline is different from previous BVR3 boardviews.
Previously last point closed the outline, in these files it ends on an whitespace.
Fixed it so that it is the...
Forum: Schematic Requests ONLY! 09-14-2022, 10:13 AM
Replies: 6
Views: 322
Posted By piernov
Re: 820-02098 and 820-02443 brd and sch files

Possible to share the original ".brd" files?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-13-2022, 01:40 PM
Replies: 61
Views: 675
Posted By piernov
Re: HP 15-ac126nv no power at all

Low resistance to ground on LDO3 is never fine.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-13-2022, 03:45 AM
Replies: 4
Views: 122
Posted By piernov
Re: Underfill chips

Several MacBooks have been subject to physical stress on the board causing problems. Somewhat common RAM slot issue on 820-3115, common GPU VCore controller issue on 820-3332, less common GMUX...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2022, 10:56 AM
Replies: 12
Views: 223
Posted By piernov
Re: Laptop HDMI port dead after storm

Diode mode to ground on all pins of HDMI connector.
Forum: BIOS Requests ONLY! 09-09-2022, 10:50 AM
Replies: 24
Views: 1,673
Posted By piernov
Re: A1534 820-00045-a efi bios dump need

Will be a CPU problem as usual.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2022, 09:09 AM
Replies: 9
Views: 139
Posted By piernov
Re: Mosfet 4410n equivalent

They did not tell which circuit of which machine the MOSFET is used in.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2022, 09:07 AM
Replies: 3
Views: 99
Posted By piernov
Re: Macbook Air A1304 noob question

MacBooks with NVidia MCP needs power button to be triggered in order to turn on.
Later Macs with Intel PCH turn on automatically when applying power after battery has been removed.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2022, 03:47 AM
Replies: 9
Views: 139
Posted By piernov
Re: Mosfet 4410n equivalent

https://logi.wiki/index.php/User:Piernov#How_can_I_select_a_replacement_MOSFET_if_I_can.27t_find_the_original_part.3F
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