If you're worried it#s used - theres an option in the menu where you can see in the menu the total uptime of your monitor
Ah thats helpful! thanks for the tip.
So 'Information' tab under the 'General' settings states that the 'Total Power on Time: 119 Hours'. Seeing as I received the monitor yesterday and only managed to switch it on in the evening.. I am going to take a wild stab and say I haven't had the thing on for 119 hours.
I finally couldn’t take the hissing noise anymore decided the throw caution to the wind and crack open the monitor.
getting the rear cover off is a real pain due to the number of clips, but once done the cover comes straight off
I turned the monitor on whilst the back was off and the hissing noise is not coming from the side fan, in fact it was motionless during my testing.
I then set about trying to access the main GSync fan, It’s definitely not for the feint hearted. You need to remove the led strips and the mount, unclip loads of cables, then unscrew the main PCB module from the panel
after removing from the panel you need to extract the pcb from the shielding. Once done the fan is clearly visible. I removed the fan and manually spun it - there was clear bearing noise and this was very similar to the hiss that I was hearing. I’m pretty confident this is the source.
tried to fix by dropping a bit of oil into the bearing and also copper grease on the spindle. It didn’t seem to make a difference as I could still hear the bearings when spinning it manually. I could see the thermal paste had been squeezed out from between the heat sink and the die and decided to replace this with some thermal grizzly. The old paste was quite thickly applied and this possibly explains my high die temperature reading in the service menu. The thermal grizzly brought this down to 57C with the back cover off so it seems to have improved temps. Unfortunately, the GSync fan seems to kick in about 50C (monitored via the service menu) so it didn’t bring this down enough to prevent the hissing sound from coming back
I think for me the only solution is to see if I can source a replacement fan and hope that is better.
If anyone else has this hissing sound and is in their return window I suggest you return it - you have take the whole thing apart to get to that GSync fan
I ordered a replacement GSync fan (same model) from Mouser in the US - the fan is pretty cheap but once you add in the VAT and Shipping it cost £25.
I'm happy to report that the hissing sound has gone away - there is still a slight warble from the the new fan (if you put your head right next to the monitor) but it is most definitely 'quiet' compared to the old fan.
So, if you have a hissing sound from the monitor it is most likely a bad fan - see https://forums.overclockers.co.uk/posts/33438986 for a previous post in this thread for a clearer recording of the noise from another user. Mine was exactly the same.
So, thanks for nothing LG - there was clearly a problem but you refused to stand by your warranty and recognise the issue.