iPhone 14 Pro Max RepairJohannesburg, Pretoria & Gauteng

⚠ Green screen / yellow screen — AB adhesive failure and exposed display flex

The iPhone 14 Pro Max shares a known display fault with the smaller 14 Pro. It starts when the AB adhesive gives way. That's the acrylic-based optical bonding that holds the layers of the display assembly together. It's one of the most common faults we see on these two models, and it takes a bit of explaining.

What happens: The 14 Pro Max display is built as a tightly laminated "sandwich". Across the full 6.7" panel, the OLED, the touch digitiser and the cover glass are bonded in layers with AB adhesive. Over time the adhesive dries out and starts to shrink, especially with heat cycles, humidity or steam. As it shrinks, the OLED display frame begins to lift off the panel beneath it.

Once the frame lifts, the display flex cable is left exposed. This is the ribbon that carries every display signal from the logic board to the OLED panel. Out in the open, the flex has nothing to shield it from moisture, movement or pressure. It starts to corrode, bend or crack, and that's when you'll notice these symptoms:

• Solid green screen: the whole display turns green and shows no picture
• Yellow screen or yellow tint: you can still see the image, but it has a heavy yellow cast
• Lines across the screen: green, purple or white lines run vertically or horizontally over the display
• Blank display: the flex has corroded so far that no signal gets through at all
• Flickering: the flex connection keeps cutting in and out, so the display flickers or strobes
• Part of the screen fails: one area works normally while another is discoloured or shows nothing

This is a progressive fault. It usually begins as a green tint or yellow cast that comes and goes, most noticeably at low brightness or in warm places. Then it gets worse as the adhesive keeps shrinking and the flex keeps breaking down. Bring it in sooner rather than later.

Why the 14 Pro Max and 14 Pro are affected: On both models the ProMotion Always-On Display stays on 24 hours a day. That constant running creates heat cycles, and they wear down the AB adhesive faster than on iPhones whose screens switch off fully. Add humidity or steam from bathrooms, kitchens or humid days outdoors, and the adhesive gives out sooner than on standard iPhone models.

The fix is a new screen. Once the flex is exposed and corroding, the display assembly can't be saved, so the whole 6.7" screen has to be replaced. For the 14 Pro Max, and the 14 Pro, we stock both used original Apple OLEDs and new OLEDs.

⚠ Random rebooting — panic log diagnostics, free assessment

When an iPhone 14 Pro Max reboots at random, several different flex cables can be to blame, just as on the 14 Pro. There's also a board-level cause that comes from the two-layer "sandwich" logic board in these Pro models. Before we replace any part, we pull the iOS panic log and find the exact error code. You don't pay for the diagnostic.

What causes it, and the panic log codes to look for:

• Proximity flex, code 0x200000
  This flex runs the proximity sensor at the top of the phone. Liquid damages it easily, and it can tear during a screen replacement. It logs SMC PANIC — ASSERTION FAILED with code 0x200000. The phone restarts on a 3-minute cycle, usually after a screen repair or contact with water.
• Charging port flex, code 0x100000
  This is the bottom flex that carries the charging connector and the sensors around it. A hard drop can damage it, and the 240g Pro Max lands hard when it falls. A badly done back glass repair can damage it too. It logs panic code 0x100000, and the phone restarts at random every 2–5 minutes.
• Power button flex
  On both the 14 Pro Max and the 14 Pro, this flex wraps around the logic board. If it's damaged, it keeps sending reset signals to power management, and the phone won't stop rebooting at random.
• 2-layer sandwich board, Gyro U7300 fault
  Inside the 14 Pro Max and 14 Pro, the logic board comes in two layers, with the AP board stacked on the RF board. A hard drop or ripped pads can break the link between the two. The Gyro sensor (U7300) then loses its signal lines, and iOS forces a restart. A new flex won't fix this one. It needs micro-soldering: we rebuild the pads and reflow the board.

Combined codes: If you see 0x300000, the proximity flex (0x200000) and the charging port flex (0x100000) have both failed at once.

What happens in our free diagnostic: First we read the panic log and pin down the fault code. Then we test with known-good OEM flexes before we replace anything. If the sandwich board is the problem, we check it under a microscope. None of this costs you anything.

Restoring the software won't stop a hardware bootloop. If your 14 Pro Max has been restored and still keeps rebooting, the fault is in a flex cable or the board. Bring it in and we'll read the panic log.

⚠ NAND storage failure — iTunes / DFU mode on heavily used devices

NAND wear is starting to show up on iPhone 14 Pro Max phones that have been used hard, or kept close to full storage, since the day they were bought. If the NAND is to blame, the phone gets stuck in iTunes or DFU mode and every restore fails with error 4013, 9, 14 or 21. Restoring the software again won't help, because the fault sits in the storage chip itself.

Where many shops go wrong: They bill for one DFU restore after another as "software repair" and never check the NAND. We replace the chip and program it properly with the P15 NAND programmer. While the NAND is out, we suggest going up to 256GB. It adds very little to the cost and leaves you with the most write cycles.

Is your Pro Max stuck in iTunes or DFU, with restore after restore failing? Don't try again. Bring it in for a free board diagnostic first.