S84F 77" TV – Clicking Noise All Night When Turned Off

[Ozarka]

Hi, I have the Samsung S84F 77" OLED (QN77S84FAEXZA) and it’s making a repeated clicking noise all night long when turned off.

What I’ve tried:

Factory reset

Disconnected all HDMI cables

Turned off Anynet+ (HDMI-CEC)

Disconnected Wi-Fi

The sound continues even when nothing is connected except power. It’s not just a few cooling clicks — it happens constantly throughout the night. Is this normal or a possible hardware issue?

Thanks for any help!

[LongHiker]

@Ozarka Although it could be a board or some type of mechanical causing the noise, I would suspect that it is something coming from the speaker(s). 

[Ozarka]

When the TV is off, speakers are inactive, and no inputs are connected — so they can’t be making noise. The repeated clicking is mechanical, not acoustic.

[LongHiker]

@Ozarka If the TV is plugged in, the speakers can be making noise. A defective part could be allowing electricity to make its way to the speakers and make the sound. 

[Ozarka]

The noise is 100% exactly as the noise the TV make as when you turns off.

[LongHiker]

Here's a test. After watching the TV to ensure it's warm, turn off and unplug the TV. If there is cooling down sound, I'll bet that it stops quickly.

[Ozarka]

I connected a hard drive to one of the TV's USB ports, and I noticed that the light on the drive turns on and off in sync with the popping noise coming from the TV. Also, if it were just a speaker issue, the popping sound wouldn't still be happening, especially when the TV is supposedly off. It seems like the TV doesn't fully power down, even when left off overnight.

[LongHiker]

The TV doesn't completely power off unless you unplug it.

Did you run the test I suggested? I think you have a power supply problem.

[Ozarka]

I ran that test before posting the original message, and of course the popping sound was gone. Whether it was a speaker issue (which it wasn't) or a power failure, unplugging the TV would naturally stop any noise.

[LongHiker]

Correct. What it wouldn't affect is cool down noise. So that is eliminated.

Time to contact support and have the TV evaluated.