Got an iPhone 11 was not turning on when the customer brought it to me. Opened to phone and found a short on PP_BATT_VCC on the battery connector. Tried using rosin smoke method to find a short but i am unable to. I suspect it is the Tigris chip (u3300).

Any help would be appreciated! :D

⟐ Commented May 19, 2026 at 10:11 MST

⟐ Commented May 15, 2026 at 23:16 MST

⟐ Answered May 08, 2026 at 2:18 MST

⟐ Commented May 08, 2026 at 2:04 MST

⟐ Commented May 08, 2026 at 1:44 MST

⟐ Commented May 04, 2026 at 19:09 MST

⟐ Answer edited May 01, 2026 at 3:31 MST

⟐ Answered April 26, 2026 at 9:06 MST

⟐ Commented April 19, 2026 at 8:39 MST

⟐ Commented April 09, 2026 at 4:27 MST

I had put it on assistance to fix the power button, he came fine. 2 months post i accidentally dropped him in a pool and he instantly turned off. Another guy tried to replace the battery and flex cable but didnt worked.

Heres the panic full

"panicString" : "panic(cpu 2 caller 0xfffffff01e0e9264): userspace watchdog timeout: no successful checkins from thermalmonitord (2 induced crashes) \nservice returned not alive with context : is_alive_func returned unhealthy : current 37fffffffffff, mask 1ffffffffffff, expected 1ffffffffffff. SD: 1 BC: 1 RC: -1 BS: 2, Missing sensor(s): Prs0 \nservice: backboardd, total successful checkins in 196 seconds: 19, last successful checkin: 0 seconds ago\nservice: SpringBoard, total successful checkins in 169 seconds: 17, last successful checkin: 0 seconds ago\nservice: mediaserverd, total successful checkins in 196 seconds: 18, last successful checkin: 0 seconds ago\nservice: audiomxd, total successful checkins in 196 seconds: 18, last successful checkin: 0 seconds ago\nservice: logd, total successful checkins in 196 seconds: 19, last successful checkin: 0 seconds ago\nservice: thermalmonitord (2 induced crashes), no successful checkins in 196 seconds\nservice: runningboardd, total successful checkins in 196 seconds: 19, last successful checkin: 0 seconds ago\nservice: wifid, total successful checkins in 196 seconds: 19, last successful checkin: 0 seconds ago\nservice: configd, total successful checkins in 196 seconds: 19, last successful checkin: 0 seconds ago\nservice: CommCenter, total successful checkins in 196 seconds: 18, last successful checkin: 0 seconds ago\n\nDebugger message: panic\nMemory ID: 0x6\nOS release type: User\nOS version: 21E237\nKernel version: Darwin Kernel Version 23.4.0: Fri Mar 8 23:26:31 PST 2024;

⟐ Answer accepted March 31, 2026 at 20:57 MST

⟐ Answered March 15, 2026 at 19:42 MST

⟐ Answered March 11, 2026 at 6:39 MST

⟐ Answered March 05, 2026 at 4:20 MST

⟐ Commented March 01, 2026 at 6:08 MST

⟐ Commented February 27, 2026 at 19:40 MST

I have faced a pretty weird issue on an iPhone 11 I recently repaired. The back housing and the screen were completely shattered, but fortunately i had a new housing pulled from a working phone.

I swapped the logicboard and all relevant components e.g. cameras, antennas etc. into the new housing, installed a refurbished OEM screen and transferred screen data onto the new one.

The phone works completely fine, Face ID is working, TrueTone is restored, BUT:

Tap to Wake does not work if the phone is placed on a flat surface, e.g. my desk.

The ridiculous part? The feature does work fine if I have the phone in my hands or a Lightning cable is plugged into the port (no need to even connect it to power!)

Tried another replacement screen —> problem persists.

Updated the phone from iOS 14.7.1 to iOS 15 Developer Beta 4 —> problem persists.

I assume a grounding issue inside the charging flex, so my next step would be to replace it with another OEM part. If this doesn’t resolve the issue, I’m pretty much at a loss.

Has anyone else faced this issue?

Thanks and greets from Germany!

⟐ Commented January 27, 2026 at 16:23 MST