MacBook Pro stage-light bands at the bottom of the screen — flexgate explained

The two symptoms

There are two distinct flexgate symptoms. You probably have one or both:

Symptom 1: stage-light bands

Vertical or near-vertical bright bands at the bottom edge of the display, looking a bit like footlights at the front of a stage. Most visible on:

• White or light-grey backgrounds (Finder, browsers, Pages)
• The lower 1–3 cm of the screen
• Worse when the lid is at certain angles

These start subtle — you'll think you're imagining it — and get progressively worse over weeks and months.

Symptom 2: backlight cuts out at full lid angle

Display works perfectly at, say, 80 degrees of lid opening. Push the lid back further toward fully open and the backlight dies entirely — image still there if you shine a torch on it, but no backlight. Pull the lid forward and it comes back.

This is the more advanced stage of the same fault.

Why this is the cable, not the display

Apple ran a flat flex ribbon — the display flex cable (sometimes called the backlight flex or the T-Con cable) — around the bottom edge of the display assembly, where it bends every single time you open or close the lid.

The cable was specced too short by a few millimetres. After roughly 10,000–20,000 lid open/close cycles, the copper traces fatigue-crack right at the bend point. The two traces that fail first are typically the ones carrying backlight power and one of the LVDS data lanes — which is exactly why you see backlight cutoff and bottom-edge artefacts.

The panel itself is fine. The T-Con board is fine. The logic board is fine. It's literally just a worn-out ribbon cable.

Which models are affected

Flexgate affects:

• 13-inch MacBook Pro 2016 (A1706, A1708)
• 15-inch MacBook Pro 2016 (A1707)
• 13-inch MacBook Pro 2017 (A1706, A1708)
• 15-inch MacBook Pro 2017 (A1707)
• 13-inch MacBook Pro 2018 (A1989) — early production only
• 15-inch MacBook Pro 2018 (A1990) — early production only

Apple silently extended the cable by about 2mm mid-way through 2018 production. Later 2018 units, and all 2019 onwards, are essentially immune. They never admitted there was a fault — they just changed the part.

There's a Display Service Programme that covered some 13-inch 2016 units, but it ended in late 2021 and never covered the 15-inch at all. Most owners now are out of any Apple coverage.

Try this first — confirm it's actually flexgate

Before booking anything, run these checks:

Test at different lid angles

• Set the lid to 90 degrees — note the screen condition
• Slowly tilt the lid back to fully open — does the backlight die at a specific angle?
• Tilt forward — does it come back at the same angle?

A repeatable angle-dependent backlight cutoff is diagnostic of flexgate. No other fault behaves this way.

Look at the bottom edge on a white screen

Open a blank white document or a Finder window with a white background. Get the bottom edge of the screen at eye level in a dimly lit room. Look for:

• Vertical bright bands, finger-width or thinner
• A general brightness gradient that's hotter at the bottom than the top
• Dark spots that pulse with brightness changes

Rule out other faults

Not flexgate if:

• The display has cracks, dead pixel clusters, or bleed at corners (panel damage)
• The whole display is dim with no brightness change at any angle (backlight LED string fault)
• You see horizontal lines or static (T-Con or logic-board GPU fault)

Apple's pathway vs cable-only

Apple's official answer: replace the entire top case display assembly. Display, lid, hinges, antennae — the whole thing. UK Apple Store pricing for that on a 15-inch is north of £600 once you include labour, and on out-of-coverage 2016 / 2017 units they often won't even quote.

Independent repair: swap just the cable. The panel, T-Con, lid, and hinges all stay. Cost is a fraction.

The catch is that the 2016–2018 display assembly is glued shut. Swapping the cable means carefully heating and prying the bezel, replacing the cable with the revised longer version, and re-bonding the assembly. It is not a 20-minute job, but it is very much not a £600 job either.

When to act

Don't wait. Flexgate is progressive:

• Early stage-lights — annoying but tolerable. Cable still has most of its traces intact
• Pronounced bands — multiple traces failing, the cable is wearing through
• Backlight cuts out at full lid open — the cable is nearly through. One bad open and you'll be looking at a black screen permanently

The cable doesn't get better. Every lid cycle wears it more. If you've spotted early-stage symptoms, book it now while it's a clean cable swap rather than a cable-plus-extras situation.

Also: if the cable fully snaps open-circuit while you're using the laptop, you'll typically lose backlight permanently. The display panel is undamaged but unusable until repaired.

The cable-only repair scope

What a competent repair involves:

• Heated separation of the glued display assembly (controlled hot-plate or heat-mat work, not a heat gun)
• Disconnect old flex cable from the T-Con board and bottom hinge clutch
• Install the revised longer flex cable (the part Apple silently shipped from late 2018)
• Cable-route check at multiple lid angles before re-bonding
• Re-bond the assembly with fresh adhesive
• Burn-in test through several lid cycles to confirm

Good-quality replacement cables come from the same panel manufacturers Apple used originally — avoid the £8 eBay specials, the copper grade is poor and they'll fail again inside a year.

Repair at Hark Tech

Flexgate cable swap is one of the cleanest MacBook repairs available — proper part, proper bonding, no full-assembly markup. Details on the MacBook flexgate repair page.