Defective fan causing boot failure?
Yet again dealing with a grey screen after boot attempt. Q3 was working as expected. Plugged it in to charge overnight and when I tried to power it up today I saw the Meta logo and the green progres...
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The fan usually doesn't run until you enter the loft, and then only briefly (maybe a bit longer if the headset was just updated). Normally it won't start blowing until you actually play a demanding game.
Just as an interesting test, can you try using your phone to cast your headset and see if it gets you past that dark screen. I think doing so can sometimes bypass a faulty proximity sensor:
Oculus Quest 2 Screen Only Works When Casting. | Meta Community Forums - 1354295
My understanding is the fan should spin momentarily - like a slight motion - when the device is plugged into power. Then it should definitely come on before the heat sink becomes almost too hot to touch. A demanding game causes the fan to come on because it’s causing the processor to heat up which hits the temp threshold for the fan to engage.
As part of my early troubleshooting I checked the app for any unfinished updates because that’s part of the Meta troubleshooting steps. The app won’t connect to the device which supports that it’s not completing a boot.
My understanding is the fan should spin momentarily - like a slight motion - when the device is plugged into power.
Yes, correct. You should get a micro-twitch when power is connected.
I could be wrong, but afaik, the fan normally only runs during booting if the headset is booting into Recovery mode or EDL (emergency download mode) mode.
If the fan isn't starting, it could be due to the boot sequence failing during sensor validation and before thermal management has initialized.
If the fan isn't starting, it could be due to the boot sequence failing during sensor validation and before thermal management has initialized.
I'm not sure about that.
My fan spins for a second after the headset is plugged in - I don't have to wear it or need to cover the sensor for that - but the headset only does it, when it is in sleep mode. If it is completely shut off, the fan does not start when the Quest gets power.
The rest is like you said, fan does not run during booting up, starts running when the loft is loaded.
If it is completely shut off, the fan does not start when the Quest gets power.
How could you know, without disassembling the headset? We're talking about a pulse-width modulation sweep (fan micro-twitch) carried out by the power management integrated circuit to confirm that the fan motor hasn't seized up.
