KFA2 geforce gtx 1660 super 1-click oc [Wentylatory nie kręcą się, brak PWM]

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Karta grafiki: KFA2 geforce gtx 1660 super 1-click oc
Oznaczenie płyty PCB: SH 94V-0 E248779

Objaw: Wentylatory na karcie graficznej włączają się tylko na sekundę zaraz po uruchomieniu systemu. Potem nawet wygrzewanie karty powoduje, że wentylatory nie ruszają. Na pinie PWM cał czas 1V.



Ze schematu podobnej karty wyczytałem, że sygnał GPIO16_FAN_A_PWM idzie bespośrednio z GPU, czy to oznacza, że rdzeń jest uszkodzony ?

Hello!

Do you have an oscilloscope?
If so, measure the voltage to ground on pin 1 of chip U16 and on pin 2 of fan connector J6 with oscilloscope in the following cases:
a) Immediately after turning on the card (when the fan is spinning).
b) After a while, when the fan is idle.

No. Currently I don't have oscilloscope. I'm going to buy it next month. However can you explain in more detail why I need to chceck it with oscilloscope?

lgolebio napisał(a):However can you explain in more detail why I need to chceck it with oscilloscope?

With your "service level= 3" you should know why

Since you measured 1V on the "PWM" fan speed control signal, we don't know, if this 1V represents the DC voltage (not fine) or an AC square wave signal (as it should be).
Another thing we want to check is the fan "tachometer" (feedback) signal on pin 2 of fan connector, where should also appear an AC square wave signal, when the fan is spinning.

If you don't have an oscilloscope, measure the voltage to ground on pin 2 of fan connector J6 with the fan disconnected from the card.

Sorry for delay, I was really sick. The client refused to wait and he took the card. I quickly made an adapter for 3PIN FAN on PC motherboard, which works. He will controll it manually from motherboard fan utility on windows.