Chosen Solution
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 :)
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.
