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

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Chemical smell... power supply?

Hello, I started noticing a strong chemical smell coming from the bottom left air-vents of the Thunderbolt Display, but no other signs. The brightness is fine, it powers the MacBook, and no strange behavior. I ordered a PSU replacement, did I make the right choice? Should I also replace the FAN? (but I’m finding only used fans…)

Update (02/18/2021)

@danj Thanks Dan, mine is different. Look at the photo, I marked what seems to originate the bad smell. Is still the component you mentioned before?

Block Image

Ответ на этот вопрос У меня та же проблема

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Without opening it up to inspect things it could be anything!

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Hello Dan thanks, yes it could off course... but I didn't want to open it without first having something to swap, as I have fear for that delicate wires that need to be disconnected to separate the two monitor parts. I wanted to know if, based on experience, this smell could indicate a faulty PSU, as the fan itself shouldn't make burning smell (am I right?), and it pushes air through the PSU pub and then it gets out on the left air vent at the bottom

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I've replaced more logic boards than PS on these monitors. A fan would not be the first thing I would suspect.

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Thanks, so I need to open it and check every power rail I suppose? At this time not other sign of malfunctioning (unfortunately). I could keep in using it, but the only thing is I have fear the smell could be toxic.. what did you find on defective logic boards?

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Burnt caps mostly

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Here’s a marked up image of some of the of the major parts

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