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27" display with 2560 x 1440 pixels resolution Thunderbolt & MagSafe cable attachments

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buzzing / Noise. Power supply issue?

Hi.

A friend have a problem with his 27" Thunderbolt display. Is it really annoying buzzing sound. My first guess would be the power supply??

The display in functioning OK, but that noise is killing the entire office.

How is the front glass attached? Glue? Can't see that in the break down guide.

Anyone else seen this?

Thanks

Here is a video of the issue.

YOUTUBE Video

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Check this teardown on how to get inside.

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Do you live near rattle snakes ;-}

Sadly, you guessed it, the power supply is starting to fail.

Is it still covered under warranty? I would still try an AppleStore first as they may have an extended warranty program for this problem.

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Sadly the warranty expired just a few months ago. Does anyone know where I can get a new power supply? At first I will try the local Apple repair shop.

Thanks.

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What happens when the power supply fails with these symptoms? I have one failing and after opening it up and powering it on with my ear next to the power supply board it appears to be coming from the solenoids. Will I be able to order replacement solenoids and will soldering them on be possible?

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Power supplies don't have solenoids. They do have transformers, coils, and capacitors which can fail.

These power supplies are not really repairable. Best just to replace the complete assembly. But before you do that did you check the voltages?

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Whoops, thanks for the correction. I think I meant inductors or "chokes", which might be what you mean by "coils".

Are you sure the capacitors aren't replaceable? I'm fairly handy with a soldering iron and would rather give it a try before spending $150 on a new PSU board.

If I wanted to check the voltages, where would I connect the multimeter probes and what numbers am I looking for?

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The problem is no one has schematics or board views for the power supplies. So you'll have a hard time diagnosing what truly failed.

The other problem is some of the components are hard to find so you run the risk of getting in over your head with costs and still no farther along.

Really, its cheaper just to replace the whole unit than spending the effort.

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Check this page out:

https://www.instructables.com/id/Fixing-...

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Charge your macbook with it's own power cable, don't use the thunderbolt display's magsafe cable. By using the independent cable charger to plug my laptop it completely stopped the noise of the thunderbolt screen.

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This can certainly help with some buzzing issues. Not a solution, but certainly a work around.

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Not silent but way better!

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I second that! Thank you!

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This issue can also be the EMI filter. This is the actual AC inlet. There are also capacitors and other passive components inside here. If the earth lead from this is also not firmly connected you may get the same buzz shown in this video. Otherwise as others have noted, it is the power supply. You can solve many buzzing issues with reapplication or additonal application of neutral cure silicone or potting compound. You will find quite a bit on there already (those white globs). Just add some more around the transformers, between any larger capacitors that might likely be vibrating against each other. Dont use acidic cure silicone or you will corrode the insides of the machine!

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I took mine into a apple specialist and it’s not the power supply. It’s the motherboard that has gone bad and making this noise. I was quote $450 + tax to get it fixed.

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Probably depends on the sort of buzzing you were hearing, but very unlikely to be the motherboard. There are not the sort of components on there that can cause buzzing.

Taking it into Apple, their go-to response is always the motherboard.

In my experience, they will replace components until it is fixed, whether the part needs it or not. Which can be a good thing for the consumer, but not great for pinning down the exact issue, or fixing units yourself. It is also not great for keeping the cost of repair down overall.

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My 27 LED Cinema Display was making a really loud buzzing noise all day. The sound was emitted from the left side of the monitor (the location of the PSU). I found that unplugging the monitor for a day or two solved the issue. I imagine this allowed the components in the PSU to discharge. Prior to that, I had always left it plugged in. Best to switch it off entirely when not in use. Hopefully this helps someone.

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This is an indication that the power factor correction circuit in the PSU is near the point of failure. Unplug the display will reduce the stress on the PFC circuit (as the circuit is always on) but eventually the circuit will fail and will need to be repaired.

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Klaus M さん、ありがとうございました!
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