i had broken (no power) lenovo y520-15ikbn mboard: nm-b191
i changed ec sio chip and laptop started working exept fan2 is always full speed
i noticed after i soldered ec sio chip that fan2 pins: +5VS_FAN2 and EC_FAN2_SPEED was bended together, so i thought ec sio chip was damaged and i changed another one ec chip but same behavior occurs, also tried with another fan assembly (i have 2x y520 laptops) but still same story, what controls the fan speed if it is not the ec sio chip, i tried to figure it out from schematics but no luck, i hope somebody can help me with this thanks
i changed ec sio chip and laptop started working exept fan2 is always full speed
i noticed after i soldered ec sio chip that fan2 pins: +5VS_FAN2 and EC_FAN2_SPEED was bended together, so i thought ec sio chip was damaged and i changed another one ec chip but same behavior occurs, also tried with another fan assembly (i have 2x y520 laptops) but still same story, what controls the fan speed if it is not the ec sio chip, i tried to figure it out from schematics but no luck, i hope somebody can help me with this thanks
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