Squeeky PC Fan caused TV to freak out

Here's a story worth to share.

My friend called me and told that if his son upstairs turns his PC on, two of his TV channels would not tune in anymore, Cable-TV setup.

I told him that usually that has nothing to do with each other and since the devices are on different floors it is even less likely. Anyway, I asked him to plug in the vacuum cleaner, tea pot, hair dryer into the same wall outlet ( 230V ) to see if any other device causes it. No, it all worked, just the PC freaked out the TV.

I then assumed, it "could" possibly be a bad PSU interfering with the house electrics but that I had never seen this before and he better tells his son to carry the desktop to my house, he leaves 2 min down the road.

When his son gave me the PC he told me there was a squeeky fan inside and he thinks its the CPU cooler. Well, he left and later that day I opened up the PC and turned it on, it was the 9cm case fan that was squeeking like a chicken about to get the head chopped of, like BRRRReeeeeee.

I pulled the 3-pin to get rifd off the noise and tested the rig...all fine, did updates and upgrades, all OK and I couldnt see any bad PSU signs from off normal Voltages, all cool as well and good looking. SO I told him that I have a new Seasonic PSU inbound in 2 days and that we can test the PSU if the problem is still there when he gets home and reconnects the PC.

It was fixed, that damn bad stupid fan caused the PC to backfire into the 230V grid so that the TV downstairs got interference on the frequency where those 2 channels affected reside.

Strange, funny and I now look different at badly running & squeeky fans :doh: