• Asus vivobook PRO 15 M3401Q - brak obrazu

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#1 Asus vivobook PRO 15 M3401Q - brak obrazu


by dysk1 24 October 2024, 17:55
Dzień Dobry,

Asus vivobook PRO 15 M3401Q

Płyta:M3500QA R2.1
CPU:R7 - 5800H
GPU:GN20-P0-A1 RTX3050

Laptop ładuje, po wciśnięciu przycisku "Power" zaświecają się LED'Y ładowania i pracy laptopa. Brak obrazu na matrycy jak i HDMI. Po rozebraniu laptopa dokonałem pierwszych pomiarów, wyniki przedstawiam na zdjęciu.
Image
Przy pomiarach nie odjąłem rezystancji przewodów pomiarowych które wynoszą 0,4Ω. Boje się o dość niską rezystancję na GPU, nigdy wcześniej nie miałem z takim do czynienia. Po schłodzeniu rdzenia rezystancja wzrasta do 0,8Ω, więc jakaś reakcja jest.
Prąd stabilizuje się w granicach 520mA i stoi. Brak procedury POST. Bios zmieniłem, wyekstraktowałem oryginalny ze strony, jak i próbowałem inne znalezione w sieci.
Jak mogę precyzyjnie sprawdzić czy to GPU czy coś innego? Czy da się odpalić jakoś płytę na samej grafice z CPU?
Proszę o pomoc i dalsze sugestie.

Pytanie dodatkowe, jakie są różnice w układach GN20-P0-D-A1 GN20-P0-A1 i czy są one zamienne?

Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by Google Adsense [BOT] 24 October 2024, 17:55

#2 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by matic 29 October 2024, 11:46
Hello!

Measure the voltages to ground on listed pins, when the machine is turned on:
- On pin 1 of resistor PR9411.
- On pins 1, 15, 18 of chip PU9401.
- On pins 2, 17, 18, 19, 20 of chip PU9101.

#3 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by dysk1 29 October 2024, 16:15
matic wrote:Hello!

Measure the voltages to ground on listed pins, when the machine is turned on:
- On pin 1 of resistor PR9411.
- On pins 1, 15, 18 of chip PU9401.
- On pins 2, 17, 18, 19, 20 of chip PU9101.


Hello matic,

PIN1 PR9411- 0V
PIN1 PU9401 - 5V
PIN15 PU9401 - 5V
PIN18 PU9401 - 5V
PIN2 PU9101 - 0V
PIN17 PU9101 - 5V
PIN18 PU9101 - 0V
PIN19 PU9101 - 0V
PIN20 PU9101 - 0V
As I turned the laptop on and off a few times, the laptop turned on twice. But the laptop doesn't start up again.
Image

#4 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by matic 30 October 2024, 12:48
Replace the BIOS chip and flash it with old (backup) dump. If it doesn't change anything, reflash a new BIOS chip with another dump.

#5 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by dysk1 30 October 2024, 18:11
matic wrote:Replace the BIOS chip and flash it with old (backup) dump. If it doesn't change anything, reflash a new BIOS chip with another dump.


I do not have such a memory have to order it in China. But I uploaded back the original bios dump what I had and noticed that if the laptop flap is closed the laptop turns on much more often. The flap can then be opened and the system works until it shuts down. Later, with the flap open, it is virtually impossible to turn on the laptop.

Image
Image

#6 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by matic 3 November 2024, 13:52
Measure the voltage to ground on jumper SL1921 with the screen lid opened and closed.

#7 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by dysk1 4 November 2024, 18:30
matic wrote:Measure the voltage to ground on jumper SL1921 with the screen lid opened and closed.


screen lid opened = 3.3V
screen lid closed = 0V

#8 Re: Asus vivobook PRO 15 M3401Q - brak obrazu


by matic 5 November 2024, 10:50
What are the symptoms with the screen lid opened? Does the machine even respond to pressing on the power button? Do voltages appear on the coils?

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