• MSI GL72M, płyta MS-16J91 - nie uruchamia się

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#1 MSI GL72M, płyta MS-16J91 - nie uruchamia się


by krisark 21 June 2024, 14:13
Witam Wszystkich,
MSI GL72M 7RDX-1087PL, płyta MS-16J91 REV: 1.0
Na płycie uszkodzony był U15 (SR30W) - było zwarcie na linii +VCCSPI oraz na cewce CHOKE11.
Mostek U15 (SR30W) oraz taśma matrycy wymienione na nowe.
Po wymianie rezystancje wróciły w granicy normy ale płyta nie uruchamia się.
Po podłączeniu zasilania pobór 0,003A, po wciśnięciu przycisku power pobór podnosi się do 0,010A i po chwili spada do 0,000A.
Po naciśnięciu przycisku power zasilania +3VSUS i +5VSUS są obecne.

PU4:
pin 3 - 3,29V
pin 13 - 5,01V

Rezystancje na cewkach:
CHOKE11 - 3,96kΩ
CHOKE10 - 6,52kΩ
CHOKE12 - 41,61Ω
CHOKE9 - 102,00Ω
PL8 - 440,12Ω
CHOKE1 - 113,00Ω
CHOKE5 - 1,98Ω
CHOKE6 - 1,98Ω
CHOKE8 - 76,30Ω
CHOKE2 - 56,00KΩ
PL3 - 31,58Ω
CHOKE4 - 12,00Ω
PL4,5 - 3,12Ω
PL6,7 - 5,82Ω
CHOKE7 - 455,98Ω

U61:
pin 8 - 3,17kΩ

Nie wyczyściłem ME Region w BIOS po wymianie mostu, ale chyba płyta powinna ruszyć nawet bez obrazu.
Proszę o pomoc w diagnozie.

Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by Google Adsense [BOT] 21 June 2024, 14:13

#2 Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by matic 21 June 2024, 20:49
krisark wrote:Mostek U15 (SR30W) oraz taśma matrycy wymienione na nowe.
Hello!
Are you sure you received a brand new PCH chip and not a used one removed from the donor board? Have you checked the chip under a microscope for any signs of reball?

#3 Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by krisark 21 June 2024, 21:47
Cześć,
matic wrote:Are you sure you received a brand new PCH chip and not a used one removed from the donor board? Have you checked the chip under a microscope for any signs of reball?
Biorę układy od jednego sprawdzonego dostawcy, nigdy nie było problemów. Układ wygląda na nowy, nie widać było kulkowania, a klej wokół rdzenia jest jasno szary. Zazwyczaj układy używane i usuwane z płyty oraz poddane kulkowaniu są już delikatnie brązowe.
Myślisz, że z układem może być coś nie tak?

#4 Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by matic 23 June 2024, 14:44
- Measure the voltages to ground on both pins of quartz Y4. It's best to measure these voltages with an oscilloscope. If you don't have it, measure with a multimeter.
- Measure the voltages to ground on pins 19, 37, 53, 108, 110 of KBC chip.
- Measure the voltages to ground on pins 114, 117 of KBC chip in the following cases:
a) Power button released.
b) Power button pressed.

Now disconnect the power supply, wait about two minutes, reconnect the power supply and perform the following measurements.
- Measure the voltages to ground on pins 32, 54, 95, 100, 116, 121, 127 of KBC chip in the following cases:
c) Before pressing to the power button (machine turned off).
d) Immediately after pressing to the power button (when the power consumption of the board is 0.01A).
- Measure the voltage to ground on coil CHOKE12 immediately after pressing to the power button.

#5 Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by krisark 23 June 2024, 19:28
matic wrote:- Measure the voltages
...
Nie rozumiem, chciałem wykonać pomiary o które prosiłeś, a tutaj płyta się normalnie uruchomiła i działa poprawnie :shock:
Nie rozumiem jak to zaczęło działać, zobaczę jutro czy będzie działać, jeśli przestanie działać to wykonam pomiary.
Image
Image

#6 Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by krisark 25 June 2024, 09:47
Laptop działa prawidłowo, wiec zamykam temat.

Re: MSI GL72M, płyta MS-16J91 - nie uruchamia się


by Google Adsense [BOT] 25 June 2024, 09:47

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