• Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

It is currently 27 June 2025, 00:20

 [SOLVED] Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

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#1 Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by krisark • 23 May 2025, 12:11
Witam wszystkich,
Lenovo ThinkPad P50, płyta NM-A451 Rev: 1.0
Brak jest zasilania na rezystorze PR2.
Spadek napięcia na PR2 - 0,80V, rezystancja 1,10kΩ - trochę nisko.
PF1 - 21,47V
PQ1:
pin 1,2,3 - 21,47V
pin 4 - 21,46V
pin 5,6,7,8 - 0,00V
Rezystancja:
PL14 - 41,20kΩ
PL19 - 4,90kΩ
PL13 - 209Ω
PL16 - 30,44Ω
PL4 - 4,40kΩ
PL109 - 274,00Ω
PL108 - 192,54Ω
PL11 - 12,32Ω
PL17 -72,50Ω
PL6,7,8 - 2,35Ω
PL 9,10 - 3,64Ω
PL103, 107 - 12,63Ω
PL 5 - 2,52kΩ
PL1 - 4,99kΩ

Proszę o pomoc w diagnozie.

Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by Google Adsense [BOT] • 23 May 2025, 12:11

#2 Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by sebastiank • 23 May 2025, 15:08
Duży masz ten spadek, jaki prąd pobiera płyta?

#3 Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by krisark • 24 May 2025, 09:19
Płyta pobiera 0.000A.
Jak podam zasilanie bezpośrednio na rezystor PR2 to pobór jest 0.006A.

#4 Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by sebastiank • 24 May 2025, 20:21
PR2 ma prawidłową wartość? Przy takim prądzie spadek napięcia powinien być dużo mniejszy.

#5 Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by krisark • 26 May 2025, 07:51
Wygląda na sprawny jest 0,12Ω

#6 Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by krisark • 27 May 2025, 10:55
Namierzyłem problem.
Przywarcie na rezystorze PR234 - sygnał DOCK_CONSUMP.
Delikatne zalanie w gnieździe JDOCK1.
Wyczyszczone styki, płyta ruszyła.

Re: Lenovo ThinkPad P50, płyta NM-A451 - brak zasilania B+

by Google Adsense [BOT] • 27 May 2025, 10:55
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