Hello , My console works just fine , the fan stopped working i replaced 3 fans now none works .
I measured the pins for the fan (as shown below) .
it seems weird that the pwm voltage is 3.3v while it suppose to be 5V .
i tried supplying 5V directly to the fan . Also nothing .
Can someone guide me to a solution or an idea of where the problem could be coming from .
PS : I changed the connector also nothing changed .
PIN 1 : GND
PIN 2 Main Power : 12V / 0.2916 in DIODE MODE
PIN 3 (TACHO) : 2.09V / 0.9725 in Diode Mode
Pin 4 (PWM) : 3.3V / 0.5148 in Diode Mode
A PWM signal is needed for controlling the fan speed. A flat 5V injection does nothing in lack of informations.
Do you have the Ohms readings at the TACHO and PWM and a osci to check the signal form of the PWM?
PWM is a tiny bit higher than I would expect: my readings are
PWM: 6.5 MOhms
Tacho: 13 kOhms
At the PWM line is only one 33 Ohm resistor (R116 @ V1 SB board) (yellow marking at image) before the southbridge IC. If this resistor is in specs I guess there is a problem with the SB itself.
