• Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

It is currently 9 March 2025, 22:48

Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

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#1 Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by subaracz • 22 January 2025, 12:51
Cześć wszystkim,
Laptop Lenovo T490, zasilanie z zasilacza (20V) dochodzi do kluczy PQ0001/2 i nie przechodzi dalej.
Sterowanie kluczami odbywa się poprzez sygnały TBT_HV_GATE oraz -PWRSHUTDOWN. Jeśli dobrze rozumiem, to oba sygnały muszą być w stanie
wysokim, żeby klucze PQ0001/2 przepuściły prąd.

Pomiary napięć:
Image

Brakuje napięcia na linii -PWRSHUTDOWN. Sygnał ten podawany jest z układu UTE1B :
Image

Sprawdziłem, że do tego układu dochodzi zasilanie 20V. Czy możecie powiedzieć jakie warunki muszą być spełnione, aby układ wystawił
stan wysoki na linii -PWRSHUTDOWN (pin 53)? A może po prostu układ jest uszkodzony?

Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by Google Adsense [BOT] • 22 January 2025, 12:51

#2 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by matic • 27 January 2025, 13:05
subaracz wrote:Jeśli dobrze rozumiem, to oba sygnały muszą być w stanie
wysokim, żeby klucze PQ0001/2 przepuściły prąd.
Hello!
Yes, exactly.

- Measure the resistance to ground on pin 5 of transistor PQ0002.
- Measure the voltages to ground on pins 43, 44, 45, 47 of the ThinkEngine chip UTE1.

#3 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by subaracz • 29 January 2025, 20:30
Hello Matic,
Thank you very much for your reply. Here are the results of the measurements:
-Resistance to ground on pin 5 of transistor PQ0002 = ~1MOhm
-Voltages UTE1:
pin 43 : 19,7V
pin 44 : 11 V
pin 45 : 19,8V
pin 47 : 0V

#4 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by matic • 31 January 2025, 10:14
Measure the resistance to ground on pin 47 of the ThinkEngine chip UTE1.

#5 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by subaracz • 31 January 2025, 19:10
Resistance to ground on the UTE1, pin 47 = 1,23kOhm

#6 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by matic • 3 February 2025, 09:38
The ThinkEngine chip UTE1 is very likely damaged and needs to be replaced.
If I'm not mistaken, this chip requires programming. As far as I know, a programmer and dump for this chip are currently unavailable. The only option is to use a chip removed from the same donor board.

#7 Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by subaracz • 6 February 2025, 18:33
Thanks for confirming my suspicions. I have already bought the second defective board. I hope that the ute1 chip will be functional and the replacement will fix my hardware. Greetings!

Re: Lenovo T490, NM-B901 rev 1.0 - nie włącza się, brak poboru prądu

by Google Adsense [BOT] • 6 February 2025, 18:33
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