Reply To: Accidentally plugged in to a 12v adapter, won’t boot
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U5 and U6 are both connected to the main 5V input rail. If one of them has its input pin shorted to ground you can measure that short on the other one too. I would recommend replacing both, since i can’t remember any case where only one got damaged from a connection to the wrong power adapter. They only cost a couple of cents and are easy to get. But replacing U5 could be a problem though, since it’s nearby the lcd display (which has to be protected from the heat of the hot air station -> i used a combination of kapton and aluminum tape in the past… which worked pretty well).
The inputs of U7-U16 are connected to the 3.3V output of U5. So if the output pin of U5 is shorted to ground the input pins of U7-U16 seem to be shorted to ground too. In the worst case some of them could be damaged too. You can’t rule that out.
Since the HDMI transmitter IC IT6613 (U3) is connected to the 3.3V output of U5 too, there is a possibility that it has been damaged too. But you can check that only after repairing the voltage regulators. If U3 is broken too the OSSC will start as usual… but gives you an ‘Init error -4’ on its lcd.
U3 is pretty cheap too… and it’s the easiest one of the three biggest ICs to replace (since it has no big ground plane on the underside)… but there is still a lot more soldering experience required than for replacing the voltage regulators.
