• Lenovo Legion Y540-15 brak +5VALW

It is currently 14 December 2024, 01:48

Lenovo Legion Y540-15 brak +5VALW

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
  3. Before posting a new topic please read all topics in TRAININGS subforum and make a preliminary diagnostic based on the content of those trainings.
  4. Uploading of any complete schematics, BIOS / firmware files or any other kind of documentation, or linking to 3rd party websites with such files, is STRICTLY PROHIBITED. You can only upload the small portion of documentation or, link to BIOS file on UNVERIFIED BIOS FILES subforum, which simplifies the diagnostics/repair. You are not allowed to upload more then one complete page of instruction/schematic per single topic. The file you upload must not contain any watermarks, "confidential" markings, links or email addresses and cannot be password-protected.
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#1 Lenovo Legion Y540-15 brak +5VALW

by siwypp • 12 December 2024, 14:02
Laptop: Lenovo Legion Y540-15
Płyta: NM-C221 Rev: 2.0
CPU: SRG26
PCH: SR40B

Laptop po strzale 20V na ADAPTER_ID, uszkodzony KBC, wymieniłem na nowy lecz płyta nadal się nie uruchamia. Po wstępnych pomiarach nie mam +5VALW z racji tego +1.8VALW też mi nie wystartuje.
Po podpięciu zasilania rezystancja spada do 16 ohm na +5VALW, gdy kondensatory się rozładują 25k ohm. Pod termowizją tylko mostek i UL1 jest lekko ciepły.
Brakuje mi pomysłów więc potrzebuję świeżego spojrzenia na sprawę :D

Re: Lenovo Legion Y540-15 brak +5VALW

by Google Adsense [BOT] • 12 December 2024, 14:02

#2 Re: Lenovo Legion Y540-15 brak +5VALW

by matic • 13 December 2024, 12:42
Hello!

Measure the power consumption (in mA) of the board before pressing to the power button (machine turned off) without the battery connected.
Does the power consumption change when you press on the power button?

Re: Lenovo Legion Y540-15 brak +5VALW

by Google Adsense [BOT] • 13 December 2024, 12:42
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