iPad 6th gen (2018) hissing with screen on

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iPad 6 Wi-Fi

The Wi-Fi only version of Apple's iPad 6, released in March 2018. Available with 32 and 128 GB storage options. Features a 9.7" Retina display and 64-bit A10 fusion chip.

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Mikkel Øgendahl @mikkill

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发帖于: 2020年11月3日

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iPad 6th gen (2018) hissing with screen on

Hi all.

So, i’ve got an iPad 2018, that’s got a “funny” issue. The iPad is hissing whenever the screen is turned on - no sound when turned off. I thought at first it had something to do with the battery and replaced that, no effect - then i tried the LCD-panel to no avail. I’ve further taken the iPad apart and inspected the mainboard itself under a microscope. Nothing looks off - and i’ve isolated the sound to one component. I do MB repairs, but never come across this issue. I’ve desoldered and reflown and soldered back on, it still hisses so my guess is that it’s defective. Now, my question is, i need to identify the IC so i can get a new, as i don’t have a donor-board at hand. Can anyone help me?

I’ve attached pictures of the board, and of the component location on the board, i hope it can give something - thanks in advance :)

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Tom Chai @tomchai 声誉积分: 73.8千 19 111 82 · Answer 1 · 2020-11-03T07:26:15-07:00

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Tom Chai @tomchai

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All this troubleshooting is probably futile, as this probably isn’t a problem to begin with.

This is called inductor whine, present in many products. It’s not a malfunction if the device otherwise works normally.

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This is not normal conductor whine - it's enrirely too loud, it sounds like I've got tinnitus, bad case if it at that and is enough to give a headache just looking at it - and it's really up to my customer to decide whether or not he wants it fixed, I'm just asking for clues which i guess is the point of this forum - so im afraid your reply is not helpful at all, as my customer wants to discard the unit, unless it's fixed..

由 Mikkel Øgendahl 完成的 2020年11月3日

Pointing out the economics or pragmatics of the repair sometimes does more than trying to fix any problem. Also this site is more like a DIY level repair site, professional repairs are not un-welcomed, but probably out of scope anyway.

I think I've seen a board diagram somewhere, but it's too late for me today.

由 Tom Chai 完成的 2020年11月3日

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iPad 6 Wi-Fi

iPad 6th gen (2018) hissing with screen on

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