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| How To Repair iPhone 16 Pro Max Fake Temp Warning | |
|---|---|
| Device | iPhone 16 Pro, iPhone 16 Pro Max |
| Affects part(s) | Main Logic Board |
| Needs equipment | Soldering Iron, Microscope, Solder Paste, Jumper Wire |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
Problem description
iPhone 16 Pro / 16 Pro Max displays a “Temperature Too High” warning immediately on boot or shortly after connecting a charger, even though the device is physically cool and shows no real thermal rise.
Symptoms
- “Temperature Too High” warning on screen
- Device refuses to charge or throttles charging
- Issue appears instantly, even on a cold device
- No abnormal current draw on DCPS
- No actual heating of CPU, PMIC, or battery
- Problem persists after:
- Battery replacement
- Charging port replacement
- iOS restore
Solution
Diagnostic Steps
- Confirm device is physically cool
- Measure current draw (should be normal / idle)
- Measure voltage at gpio_aop_from_baro_int_l
- ❌ ~0.8–0.9 V → fault confirmed
- Locate pp1v8_s2_dock_conn
- Verify donor rail is clean and stable before proceeding
Repair Steps
- Disconnect battery
- Identify gpio_aop_from_baro_int_l
- Identify pp1v8_s2_dock_conn
- Solder a 1 kΩ resistor in series with a fine jumper wire
- Connect:
- One side of resistor → 1.8 V source
- Other side → affected dock FPC signal pad
- Secure jumper to prevent movement or shorts
- Reconnect battery and power on device