IPhone 6S No Image: Difference between revisions

IPhone 6S No Image
Device	IPhone 6S
Affects part(s)	Motherboard
Needs equipment	Soldering Iron, Hot-Air Station, Microscope
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Revision as of 17:48, 21 September 2025

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Problem description

The Device turns on but it has no image.

Symptoms

Device boots but no image is displayed

Solution

The no image problem can have 2 causes a bad display or a motherboard problem.

Diagnostic Steps

The first thing to do is to always rule out bad parts, so first try a new display on the phone if it works great all that is need is a screen replacement.

If even with a new display the phone is unable to display any image the problem is on the motherboard.

Start by inspecting the FPC connector for any liquid or physical damage.

If everything is fine take diode readings of the display FPC and compare them with the image bellow.

If the diode readings you took are ok next thing to check is if the voltages need to display image are present.

PP5V7_LCM_AVDDH_CONN
PN5V7_LCM_MESON_AVDDN_CONN
PP1V8_LCM_CONN
PP5V7_MESON_AVDDH_CONN

These voltages can be measured here and only show up with the device turned on.

Final Testing

@@ Line 1: / Line 1: @@
 {{Repair Guide
-|Device=IPhone 15 Pro Max
+|Device=IPhone 6S
 |Affects parts=Motherboard
 |Needs equipment=Soldering Iron, Hot-Air Station, Microscope
@@ Line 13: / Line 13: @@
   -->
-The iPhone doesn't charge and touch doesn't work
+The Device turns on but it has no image.
-[[File:Iphone 15 pro max not charging.jpg|thumb|iPhone 15 Pro Max Not Charging.(Image by Cell Phone Repair Academy)]]
 == Symptoms ==
 <!--
 Detail all measurable or observable symptoms in this section.
 -->
-* Device doesn't charge.
+* Device boots but no image is displayed
-* Device doesn't charge and touch is also not working.
 == Solution ==
@@ Line 29: / Line 26: @@
 -->
-This problem is usually associated with a bad U9500 this chip detects what is connected in the USB C port.
+The no image problem can have 2 causes a bad display or a motherboard problem.
 === Diagnostic Steps ===
-The first step is to always rule out faulty parts. Start by testing a new display and battery.
+The first thing to do is to always rule out bad parts, so first try a new display on the phone if it works great all that is need is a screen replacement.
+If even with a new display the phone is unable to display any image the problem is on the motherboard.
-If your device doesn't charge, this doesn't mean the U9500 is bad. This issue can also be caused by a faulty Tigris IC. A good way to test is to try a wireless charger. If the device charges with a wireless charger, it means the Tigris IC is working.
+Start by inspecting the FPC connector for any liquid or physical damage.
-For the U9500 to work, it must have 5V on the pad below. To measure this, you will need to separate the motherboard, connect the charging port, and then connect it to a charger.
+[[File:PlaceHolder image.png|center|thumb|PlaceHolder_image]]
-[[File:5V U9500 input.png|center|thumb|U9500 5V Input]]
+If everything is fine take diode readings of the display FPC and compare them with the image bellow.
-If you measure 5V at the input, it indicates that the U9500 is receiving power and should be functioning.
-=== Repair Steps ===
-The U9500 doesn't work alone, it functions in conjunction with a ROM IC (U9720). This creates a challenge because we cannot replace just the U9500. To replace the U9500, we must also replace the U9720, and both components need to be sourced from a donor board, specifically from an iPhone 15 Pro Max. '''They cannot be sourced from an iPhone 15 or 15 Pro.'''
-[[File:IPhone 15 Pro Max.png|center|thumb|IPhone 15 Pro Max Charging ICs]]
-==== Replacing the U9500 and U9720 ====
-* Use your hot air station to desolder the old U9500 IC from the motherboard, while its still hot desolder the ROM IC U1030.
-* Clean the pads on the motherboard thoroughly.
-* Reball the new U9500 if it isn't pre-balled.
-* Reball the new U9720.
-* Use your hot air station to solder the new U9500 IC onto the motherboard.
-* Solder the new U9720
-After replacing the U9500 and U9720, test if the phone is charging and if the touch functionality is working. To do this, connect the charging port, screen, and battery to the top board. The iPhone 15 Pro Max can power on with just the top board. Plug the phone into a charger and use an amp meter to measure the current the phone is receiving.
-After confirming that the phone is charging and the touch functionality is working as expected, the next steps are to reball the bottom board and resolder both boards back together.
+If the diode readings you took are ok next thing to check is if the voltages need to display image are present.
-== Final Testing ==
+* PP5V7_LCM_AVDDH_CONN
-After assembling the phone, ensure every function is working as expected, not just the charging circuit.
+* PN5V7_LCM_MESON_AVDDN_CONN
+* PP1V8_LCM_CONN
+* PP5V7_MESON_AVDDH_CONN
-Connect the phone to a fast charger and check if it fast charges using an amp meter. If it’s fast charging, it should draw 9V and around 2+ amps, depending on the battery capacity.
+These voltages can be measured here and only show up with the device turned on.
-Connect the phone to a computer and verify that data transfer is working.
-Connect USB-C headphones and confirm that audio is functioning as expected.
+== Final Testing ==