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iPhone 12 mini crash - Panic CPU x caller

Hi guys, after screen (LCD incell iTruColor) and battery replace my 12 mini started crashing randomly.

Trying to explain: take the phone, press power botton, see black screen with only the possibility to see time and date + widget (in white color) on lock screen and background total black. So, phone crash and restart, after that seems to be fine until a new crash in the same way.

It's not a port crash cause it doesn't appen every 3 min, but smth like every hour, less time o more.

I assumed that the cause could be screen or battery, what do u think about?

There's crash report by 3u tool (just first page).

Thanks

{"bug_type":"210","timestamp":"2023-09-28 07:07:21.00 +0200","os_version":"iPhone OS 17.0.2 (21A351)","roots_installed":0,"incident_id":"CE3A7996-04AB-47CF-93B9-573CBC50B703"}

{

"build" : "iPhone OS 17.0.2 (21A351)",

"product" : "iPhone13,1",

"socId" : "8101",

"socRevision" : "11",

"incident" : "CE3A7996-04AB-47CF-93B9-573CBC50B703",

"crashReporterKey" : "3b3024a3249931b5b9d704c27fdd0e30705bd80f",

"kernel" : "Darwin Kernel Version 23.0.0: Fri Sep 15 13:42:40 PDT 2023; root:xnu-10002.2.12~1\/RELEASE_ARM64_T8101",

"date" : "2023-09-28 07:07:21.00 +0200",

"panicString" : "panic(cpu 2 caller 0xfffffff02aebb374): DCP PANIC - apt firmware: adisp.c:2756 start_frm_active() -- - iomfb_mailbox(65)\napt firmware: adisp.c:2756 start_frm_active() -- \nRTKit: RTKit-2413.2.1.release - Client: local-iphone13dcp.release\n!UUID: f17c9e48-7e13-378c-966e-cb19dd25fad2\nTime: 0x000000004bcedacd\n\nFaulting task 65 Call Stack: 0x0000000000028160 0x0000000000027af8 0x00000000000278fc 0x00000000000206c4 0x00000000000c3970 0x00000000000f282c 0x00000000000f257c 0x00000000000f00b4 0x0000000000028644 0x0000000000023148 000000000000000000\nRTKit Task List:\n name | pri | stack use | status | resource | warning\n 0 rtk_background | 007 | 880\/2048 | SEMWAIT | 0x467c40 | \n 0x0000000000022540 0x0000000000023620

Update (09/29/23)

UPDATE: for the moment phone is on since 1 day without any crash (I've checked reports) so it's maybe a faulty screen.

I'll update when LCDs screens back in stock and let you know if with another screen I will fix my issue.

I will also put some information about if it's worth to replace an oled with an LCD or if I will have some problems.

Update (10/06/23)

UPDATE: got a new display (incell) and everything is fine, so it was just a faulty display.

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Tagging Alisha (@flannelist) for help with this one; all I've come up with so far is one claim that DCP stands for Display Co-Processor, which would be the graphics chip part of the SOC.

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So problem with logic board or could be just a faulty display? I hope the second… and could the fact that I’m using LCD a problem or not?

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@andreacastiello

Hi Andrea,

Yes, either a logic board or a display problem is possible but the instances of the error you're seeing that I've encountered so far have all been on MacBooks rather than iPhones, so it's not clear what the correlation is yet. I haven't seen anyone who claims to have come up with a fix for it, but most are suggesting a wipe and restore of the MacBook to try and clear it; that would be equivalent to doing a full restore on your phone, making sure you have a backup first, of course.

Plus I don't consider the acronym decoding to be authoritative either; I don't know anything about the person making the claim, so they could have inside knowledge about it or they could just be guessing that DCP means Display Co-Processor.

On earlier versions of the iPhone there haven't really been any kernel panics directly attributable to the screen, but we have seen quite a few related to the battery so if I had to guess I would tend to lean toward the battery first, but it's a crapshoot.

The part that concerns me about the Incell LCD display is that LCDs have different electrical characteristics so aftermarket manufacturers have to basically convert the OLED signals to LCD signals and I don't know what kind of issues that may present; it's entirely possible something got lost in translation and is causing your panics.

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I'm pretty sure that it could be a faulty display, I opened an RMA for it and waiting for buying a new one... waiting for it I put back the original display (also if with lines and without touch) and turned on the phone... I'll check in the next days if there are other crash logs registered, if not it will be for sure a problem related to the aftermarket display.

I'll update this conversation soon.

Thanks

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@andreacastiello Sounds good, we'll be interested in keeping up with your progress since this is a new panic for us so it'll be great if you get it resolved as it will help others who encounter it in the future.

One thing to be aware of with the LCD replacement screens is that they take more power due to the addition of a backlight so your battery life will probably be reduced, although to what extent it's hard to say.

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yep ofc... I know about battery life, but if I buy a good LCD pannel I think that the gap could be not so big... I'm just afraid about possible damage to the phone board, hope to be away from this.

Unfortunatelly OLED panels cost too much in my country and I don't want to go on a bad hard oled.

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