IPad 7 Not Charging: Difference between revisions

IPad 7 Not Charging
Device	IPad 7
Affects part(s)	Motherboard
Needs equipment	DCPSU, Thermal Camera or freeze spray
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Latest revision as of 21:41, 25 August 2025

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Problem description

The iPad does not charge the battery

Symptoms

The iPad does not charge the battery.

Diagnostic Steps

On iPads that do not charge there is 3 things that are common to fail: the battery, the charge port or the Tristar IC

Start by testing a new battery if possible but if the device does turn on but does not charge the battery may not be the issue.

Inspect the charging port of the iPad for any debris, physical damage, or liquid damage.

If everything is ok the next step is to diagnose the charge circuit.

Start by checking if the 5V from the charger are actually arriving to the main board measure this filter it should have around 5V

If there is not voltage here with the charger plugged in the replace the charging port flex.

Next check if the voltage is arriving to this mosfet

If there is no voltage there or you have less them 5V for example 2V it means that the filters F3700 and F3750 are faulty and must be replaced.

Next check if the mosfet is working the output is the expected 5V if its not Q8550, DZ8550 or R8550 may be faulty.

The Tristar U1700 reduces the voltage drop from 600 mV to 30 mV (or less), measure it on the diode scale. If it doesn't drop, swap the Tristar (U1700).

The Tristar used on the iPad 7 is 610A3B, this is common to fail if the user uses bad quality cables.

If you have these symptoms: the iPad charges but only turned off, the iPad only charges in one position.

These issues are related to the Tristar.

Repair Steps:

The Charge Port is soldered to a flex cable to the mainboard.

To the replace the charge port all you need is flux solder and soldering iron a microscope helps a lot.

Fallow this guide on how to replace it: https://www.youtube.com/watch?v=p10B2fW9zOI

The Tristar on this model is not underfilled so replacing it not that bad.

To replace the Tristar you will need a hor air station.

Use your hot air station to desolder the old Tristar from the motherboard.
Clean the pads on the motherboard thoroughly.
Reball the new Tristar if it isn't pre-balled.
Use your hot air station to solder the new Tristar onto the motherboard.

Here is also a video guide on how to replace the Tristar on a iPad 7: https://www.youtube.com/watch?v=YIoUyNI3ajE

Final Testing

If you replace the charge port make sure the iPad Charges and Data transfer also work, also test that both speakers are working.

If the Tristar was replaced test that the iPad charges and is able to data transfer.

@@ Line 1: / Line 1: @@
+{{Repair Guide
+|Device=IPad 7
+|Affects parts=Motherboard
+|Needs equipment=DCPSU, Thermal Camera or freeze spray
+|Type=Soldering
+|Difficulty=3. Hard
+}}
+{{stub}}
-'''820-3662 NO NUMERIC KEYS / CAPS LOCK INVERTED / INPUT DELAY - TOUCHPAD ISSUES'''
+== Problem description ==
+<!--
+Provide a concise description of the issue here. Be  as specific as possible to help readers quickly determine whether or not this is the exact problem they are facing.
+ -->
-The device arrived with the numeric keys on the internal keyboard non‐functional, despite a complete keyboard replacement. Visible moisture and sulfation were detected near the keyboard’s SPI controller (U4801).
+The iPad does not charge the battery
+== Symptoms ==
-🔍 '''Step-by-Step Diagnosis'''
+* The iPad does not charge the battery.
-Visual inspection: Corrosion was found near the keyboard/trackpad controller area (U4801).
-Voltage drop across R4814 (relevant resistor in the SPI circuit) was checked and confirmed expected values.
-'''''Chip replacement attempts:
+=== Diagnostic Steps ===
-'''
+On iPads that do not charge there is 3 things that are common to fail: the battery, the charge port or the Tristar IC
-'''First attempt:'''
+Start by testing a new battery if possible but if the device does turn on but does not charge the battery may not be the issue.
-Replaced U4801 with a donor chip from board 820-3476 (MacBook A1502).
+Inspect the charging port of the iPad for any debris, physical damage, or liquid damage.
-🟡 Result: Keyboard worked, but Caps Lock LED was reversed (lit when lowercase, off when uppercase).
+If everything is ok the next step is to diagnose the charge circuit.
-'''Second attempt:'''
+Start by checking if the 5V from the charger are actually arriving to the main board measure this filter it should have around 5V
-Used a chip from MacBook A1278 (Unibody).
+[[File:IPad 7 5V input.png|center|thumb]]
+If there is not voltage here with the charger plugged in the replace the charging port flex.
-🔴 Result: Severe input delay, no trackpad and overall poor keyboard behavior.
+Next check if the voltage is arriving to this mosfet
+[[File:Q8550 iPad 7.png|center|thumb]]
+If there is no voltage there or you have less them 5V for example 2V it means that the filters F3700 and F3750 are faulty and must be replaced.
-'''Final solution:'''
+Next check if the mosfet is working the output is the expected 5V if its not Q8550, DZ8550 or R8550 may be faulty.
+[[File:Q8550 output.png|center|thumb]]
-Replaced with U5701 from donor board 820-3332.
-✅ Result: Keyboard fully functional, Caps Lock LED working properly, no delay, trackpad also fully operational.
+The Tristar U1700 reduces the voltage drop from 600 mV to 30 mV (or less), measure it on the diode scale. If it doesn't drop, swap the Tristar (U1700).
+[[File:R1715.png|center|thumb]]
+The Tristar used on the iPad 7 is 610A3B, this is common to fail if the user uses bad quality cables.
+If you have these symptoms: the iPad charges but only turned off, the iPad only charges in one position.
-'''⚙️ Technical Conclusion'''
+These issues are related to the Tristar.
-The U4801/U5701 keyboard SPI controller contains firmware/configuration specific to each board model. These chips are not freely interchangeable between different MacBook series (A1278, A1502, A1398, etc.).
+== Repair Steps: ==
+The Charge Port is soldered to a flex cable to the mainboard.
-⚠️ '''Using an incompatible IC can cause:'''
+To the replace the charge port all you need is flux solder and soldering iron a microscope helps a lot.
-Reversed Caps Lock LED logic.
+Fallow this guide on how to replace it: https://www.youtube.com/watch?v=p10B2fW9zOI
-Noticeable input delay on keys input.
+The Tristar  on this model is not underfilled so replacing it not that bad.
-Malfunctions with the trackpad or power button.
+To replace the Tristar you will need a hor air station.
-✅ '''Key Takeaway'''
+* Use your hot air station to desolder the old Tristar from the motherboard.
+* Clean the pads on the motherboard thoroughly.
+* Reball the new Tristar if it isn't pre-balled.
+* Use your hot air station to solder the new Tristar onto the motherboard.
-“The keyboard IC (U4801/U5701) must come from a firmware-compatible logic board. Although they are electrically identical, their internal configuration depends on the board model and its interaction with the SMC.”
+Here is also a video guide on how to replace the Tristar on a iPad 7: https://www.youtube.com/watch?v=YIoUyNI3ajE
-— Diógenes el Perro
-🛠️ Note: Neither the BIOS nor the SMC were reprogrammed during this repair.
+== Final Testing ==
+If you replace the charge port make sure the iPad Charges and Data transfer also work, also test that both speakers are working.
+If the Tristar was replaced test that the iPad charges and is able to data transfer.