• Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.

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#1 Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 20 January 2024, 17:21
Karta graficzna pochodzi z komputera Medion X7817.
Problem polega na tym, że karta graficzna MS-1W051 czasami wstaje i przez chwilę działa prawidłowo, po chwili podczas pracy laptop nagle się wyłącza.
W zasilaczu (19V 9,5A) działa wtedy zabezpieczenie przeciw zwarciowe i pozbawia on napięcia. Po odłączeniu od zasilacza 230V na kilka sekund, i podłączeniu na nowo, pojawia się prawidłowe napięcie 19V . Potem podczas prób uruchomiania laptopa zabezpieczenie działa od razu po naciśnięciu Power ON na laptopie wtedy błyśnie niebieskie podświetlenie. Na kamerze termowizyjnej widać jak Mosfet MP86963UT się nagrzewa i zasilacz odcina zasilanie.
Nie mogę sprawdzić kamerą drugiej strony karty ponieważ uniemożliwia to jej montaż.
I troszkę zgłupiałem czy grzanie Drivera to skutek jego uszkodzenia czy przyczyna jest gdzieś indziej.
Znalazłem temat na którym ktoś sugerował wymianę kondensatorów, ale nie wiem które to ponieważ nie mogę znaleźć schematu do te karty graficznej.
viewtopic.php?p=187065#p187065

Poniżej film z kamery i zdjęcia z zaznaczonym układem:

https://youtube.com/shorts/ofqDw_Kk-Uk?feature=share

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Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by Google Adsense [BOT] 20 January 2024, 17:21

#2 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by matic 20 January 2024, 23:41
Hello!

Since this chip drives one of the phases in the 4-phase power supply and is the only one that heats up, I don't think this issue is related to the capacitors mentioned in the linked thread.
Replace this chip (MP86963DUT).

#3 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 31 January 2024, 23:04
Replacing the mosfet and the graphics card works.
When the load exceeds 40%, the image freezes.

#4 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by matic 1 February 2024, 11:56
Check that all GPU power supply phases are working. To do that, use an oscilloscope and measure the voltages to ground on the converter side (switching side) of all coils on the graphics card.

#5 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 7 February 2024, 23:22
matic wrote:Check that all GPU power supply phases are working. To do that, use an oscilloscope and measure the voltages to ground on the converter side (switching side) of all coils on the graphics card.


Unfortunately, two mosfets do not work.
Previously, there were two in operation. Maybe the new one is damaged.
Green working, red not working.

Image

#6 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by matic 8 February 2024, 17:06
Swap the DrMOS chips U2 and U3 with each other and check which phases are working in this case.

#7 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 8 February 2024, 20:05
Which are U2 and U3. I don't have a schematic for this card.

#8 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by Vogelek23 8 February 2024, 20:22
sq6kxu wrote:Which are U2 and U3
Oznaczone na laminacie. U2 pierwszy od lewej, U3 drugi od lewej.

#9 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 12 February 2024, 23:34
After replacing U2 with U3. Only U3 works

#10 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by matic 13 February 2024, 12:24
Try to load the graphics a bit and check if the chip U2 starts working.
If not, replace the controller chip U501.

#11 Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by sq6kxu 13 February 2024, 21:57
Now, even without load, the image freezes after a few minutes. I will try to resolder DrMOS again.

Re: Karta graficzna MS-1W051 z komputera Medion. Przetwornica powoduje zwarcie.


by Google Adsense [BOT] 13 February 2024, 21:57

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