• Thinkpad L590 NM-B931, Nie uruchamia się

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#1 Thinkpad L590 NM-B931, Nie uruchamia się


by serialnumber 1 February 2024, 13:50
Cześć,
Po wpięciu zasilania, matryca na chwilę zamruga(bez treści na ekranie), na klawiaturze i switchu power pojawia się podświetlenie. Wszystkie napięcia obecne, prócz tych na cewkach procesora (PL403, PL406, PL411).
Po rozlutowaniu zworki PJ202, na lini 3VALW występuje te około 40 Om.

Przetwornice(PL411,PL406,PL403), sygnałami wejściowymi są DRVON i PWM_XX
PL403- DRVON 4,87 V, PWM_1A 1,98 V
PL406- DRVON 4,87 V, PWM1_2PH 1,98 V
PL403-DRVON 4,87 V, PWM2_2PH 1,98 V

Czy te sygnały PWM są poprawne, np dla przetwornicy PL408, PWM_1B = 0,56 V ?

Pomiary na cewkach bez wpiętej baterii:
PL201(przetwornica 3,3V)-3,3 V, 35 Om
PL202(przetwornica 5V)- 5V, 50 kOm
PL301-1,20 V
PL203-5V
PL802-2,5V
PL102-9V
PL610(VS_VGA)-1V,4Om
PL408(VCC_SA)-1V,15,5 Om
PL411(VCCCORE)-0V, 3 Om
PL406(VCCCORE)-0V,3 Om
PL403(VCCGT)-0V,4,8 Om

Prosiłbym o dalszą pomoc w diagnozie ,
Pozdrawiam.

Re: Thinkpad L590 NM-B931, Nie uruchamia się


by Google Adsense [BOT] 1 February 2024, 13:50

#2 Re: Thinkpad L590 NM-B931, Nie uruchamia się


by Vogelek23 1 February 2024, 14:57
serialnumber wrote:PL201(przetwornica 3,3V)-3,3 V, 35 Om
Taka rezystancja w tej gałęzi jest zdecydowanie za niska. Rozlutuj zworkę PJ202 i między masę a ten pad zworki, który wykazuje niską rezystancję, podłącz 3,3V z zasilacza serwisowego. Po około 15-30 minutach sprawdź wierzchem dłoni (lub kamerą termowizyjną, jeśli dysponujesz), w którym miejscu płyta się choć trochę nagrzała - szczególną uwagę zwróć na mniejszy rdzeń procesora, multiplekser U4301, kontrolery U7202, U4601, U5201, przełączniki U5301, U7201 oraz kość BIOS.

Re: Thinkpad L590 NM-B931, Nie uruchamia się


by Google Adsense [BOT] 1 February 2024, 14:57
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