V1.0.32 (pre-1.1.0) now available for beta testing

[IvoGrijt]

Remember when I posted this:

@IvoGrijt

@PhilipsEngineering I’m not sure if it’s my idea or changed conditions in my living room, but I can now hear the fan again whereas on 1.0.32 I couldn’t hear it. Were there changes made between these two versions in this regard? It’s not as loud as it used to be in 1.0.29 but I can hear it again in Energy Saver in 1.1.0.

Depending on your reply I’ll run a sound measurement tomorrow, revert to 1.0.32 and measure again, then update to 1.1 again after.

Turns out it wasn’t the fan, but the light engine.

@IvoGrijt

I’ve also noticed this sound, I had been testing with FW 1.0.32 which had the fan noise reduction and did not have this extra noise. It is so apparent that I even thought at first that the adaptive fan control did not make it into the FW 1.1.0 version, and reported this. It’s only after your post that I tested and indeed discovered it’s coming from the light engine when powered. I know this as indeed it only starts when the light output becomes brighter when powered, a second or so after plugging in.

I’ll downgrade to 1.0.32 later this week to see if this changes anything.

I’ve tested with both chargers I have, the 15V4A capable PPM standard and another one that’s 15V3A capable, with the same results.

Edit (2:45AM): The noise is gone, unplugging and replugging the power cable no longer has an effect. Difference: the battery is now full charged.
So I now think it might be a combination of the light engine going brighter, and the battery charging. I’ll try some more settings and at a lower battery level again tomorrow to verify or repudiate these findings.

Edit (2:55AM): I was using wired headphones while watching a movie after my initial testing, and when I paused the movie to write the 2:45 edit, I noticed afterwards that there was a hum in the headphones. I unplugged the headphones, et voilá! the noise was back. Plug them in, noise gone. So it seems to be a grounding or some other electrical whining that is picked up by the audio system, and being output by the speakers or the headphone jack (system volume does not affect the sound level of the noise). In the headphones as well as the speakers the sound only happens when plugged in, charge level and status do not have an effect on the noise, contrary to what I thought before.