• Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

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Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

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#1 Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

by Sasni • 16 December 2023, 16:43
Dzień dobry.
Pracuję nad laptopem Lenovo Z50-70 na płycie ACLUA / ACLUB NM-A273 rev 1.0
Po wciśnięciu włącznika zapala się biała dioda power.

na Q23 mam +5VALW, ale nie ma +5VS (brak także +3VS)
+20VSB obecne, rezystory (R148 i R149) raczej sprawne
Na płycie fizycznie brakuje Q26 ale na jego pad Gateway dochodzi 5V
Q2 fizycznie jest na płycie, na Bramkę wchodzi 5V na drenie jest 0V

KBC:
n74 - +3VALW_EC- 3,3V
n110 - PWRSW# - 3,3V - Jak nacisnę przycisk to spada do 0V
n35 - DPWROK_EC - 3,3V
n107 - SYSON - 0V
n99 - PCH_PWORK - 0V
n97 - PCH_PWR_EN - 3,3V
n79 i 80 - 0V
n30 - SYS_PWROK - 0V

Q23 iQ24 byłyby do wymiany? Dochodzi do nich 5VALW i 3VALW ale nie wychodzi +5VS / +3VS Czy źle to interpretuję?

Re: Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

by Google Adsense [BOT] • 16 December 2023, 16:43

#2 Re: Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

by matic • 16 December 2023, 17:01
Sasni wrote:Q23 iQ24 byłyby do wymiany? Dochodzi do nich 5VALW i 3VALW ale nie wychodzi +5VS / +3VS Czy źle to interpretuję?
Hello!
Transistors Q23, Q24 afe most likely fine.

Sasni wrote:Na płycie fizycznie brakuje Q26 ale na jego pad Gateway dochodzi 5V
And that's wrong.
To enable the voltages "+5VS", "+3VS" the voltage on gate of control transistor Q25 should be 0V.

Measure the voltages to ground on pins 2, 6 of transistor Q6 in the following cases:
a) Before pressing to the power button (machine turned off).
b) After pressing to the power button (power LED is turned on).

#3 Re: Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

by Sasni • 17 December 2023, 11:37
Hi @Matic
p2 - 0V (all time)
p6 - 5V (all time)

the SUSP# signal should be low and when I press the switch it should increase?

Re: Lenovo Z50-70 (NM-A273) - świeci tylko dioda Power

by Google Adsense [BOT] • 18 December 2023, 09:47
 This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).
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