We've repaired more than 18,000 Apple devices over the past eight years at our Hyde Park workshop, and GPU faults account for roughly 12% of all logic board failures we encounter. The good news: most GPU issues are repairable, the diagnosis is straightforward, and the cost is far lower than replacing the entire machine.
This guide walks you through what causes GPU failure, how we diagnose it, what to expect during repair, and why residents and businesses across Rosebank, Sandton, and Bryanston trust us with their machines.
What Causes GPU Failure in MacBooks and iMacs?
Graphics processing unit failures rarely happen by accident. In our experience, there are three primary culprits.
Heat stress and thermal cycling accounts for roughly 60% of GPU failures we see. MacBooks generate significant heat during video editing, 3D rendering, or gaming. When devices are subjected to load shedding power cuts — which Johannesburg residents know all too well — the sudden power loss followed by immediate restart creates thermal shock inside the machine. The GPU's solder joints expand and contract rapidly, leading to micro-fractures in the circuitry. Over months, these fractures accumulate and the GPU dies.
Manufacturing defects affect certain MacBook Pro models from 2012 to 2015 (the AMD Radeon R9 and M370X generations). Apple even issued a repair programme for some units, though that programme has now expired. If you own one of these machines and experience GPU failure, you may still qualify for out-of-warranty repair at reduced cost — we can check your serial number.
Liquid damage is the third major cause. Water or coffee ingress onto the logic board doesn't always kill the machine outright; sometimes it corrodes the GPU circuitry over weeks, gradually degrading performance until the chip fails entirely. Our liquid damage repair service covers exactly this scenario, and early intervention — bringing your machine in within 24 hours of spillage — dramatically improves recovery rates.
How We Diagnose GPU Faults in Our Hyde Park Workshop
Proper diagnosis is the foundation of any successful repair. We never charge for diagnosis, and the process takes roughly 45 minutes.
First, we run Apple's built-in Hardware Test (or Apple Diagnostics on newer machines). This utility places stress on the GPU and reports back within seconds whether the chip is responsive. A failed test is usually conclusive — though not always. Some GPUs fail intermittently.
Next, we inspect the logic board under magnification, looking for obvious signs of heat damage: discoloured circuitry around the GPU package, lifted solder joints, or cracked capacitors nearby. We photograph the board so you can see what we're seeing.
If the board appears intact visually, we move to thermal imaging. We apply a known workload to the machine and watch how heat distributes across the logic board using a thermal camera. A faulty GPU typically shows a cold spot — the chip isn't processing heat because it isn't processing anything. This is nearly 100% reliable.
Finally, we run our own GPU stress test software for 30 minutes. If the machine survives without artefacts or thermal shutdown, the GPU is serviceable. If it crashes, freezes, or displays corruption, we've confirmed failure.
What Does GPU Repair Cost in Johannesburg?
Our diagnostic fee is R599. If you proceed with repair, we credit that cost against your final invoice.
Repair itself depends on the fault's severity. If the GPU is simply reflowed — essentially, we heat the logic board carefully and allow solder joints to remelt and re-seat — the cost is R1,890 to R2,490, and turnaround is 48 hours. This works for approximately 40% of failures we diagnose.
If the GPU chip requires removal and replacement with a new or refurbished component (a far more invasive procedure), expect R3,490 to R4,890 and 5–7 working days. This is necessary when the solder joints are fractured beyond recovery, or when the silicon itself is damaged.
Every repair comes with a 2-year warranty. If the same GPU fails again within 24 months, we repair it at no cost. And if your device fails within the first 30 days for any reason unrelated to the original fault, we refund your repair cost in full.
Load shedding has made GPU repair more common than ever. We've adapted our workshop with backup power so you can still access repairs even during Stage 6 cuts, and we offer free device drop-off for customers in Rosebank, Randburg, and Sandton.
GPU Repair Turnaround: What to Expect
Our standard turnaround for reflow repairs is 2–3 working days. Johannesburg's power cuts sometimes extend this by a day, but we communicate delays immediately.
For chip replacement, expect 5–7 working days. We source components from verified suppliers (never counterfeits), and the actual desoldering, cleaning, reballing, and replacement process requires precision equipment and significant labour.
If your machine is critical to your business — perhaps you're a designer or video editor — we offer an express service: same-day diagnosis, priority scheduling, and loaner device provision at no charge. Many Rosebank design and marketing agencies use this service during client deliverables.
Our Hyde Park workshop is open Monday to Friday, 08:00–17:30, and Saturday 10:00–14:00. Turnaround times are posted live on our website so you always know where your device stands.
Why ZA Support Over Other Johannesburg Repair Shops?
Three things set us apart.
First, our technicians hold Apple's own certification (ACMT and ACSP), not just generic electronics training. We understand Apple's design philosophy and the specific failure modes of each model generation. That expertise translates to higher success rates and faster diagnosis.
Second, we're committed to keeping your data private. We've completed full POPIA compliance training and we never access your user files unless explicitly authorised — in writing — by you. All repairs happen in our secure workshop, and your machine never leaves our building.
Third, we're local. We understand Johannesburg's climate (the humidity spikes in summer cause secondary corrosion), we know the suburbs where our clients live, and we price in South African rands without hidden conversion markups. When you speak to us, you're speaking to people who run businesses in Rosebank and Bryanston, not a call centre 6,000km away.
If you'd like to book a diagnostic appointment, book online at zasupport.com/book, or WhatsApp us on 064 529 5863 if you'd prefer to discuss your issue first.
For more complex logic board issues — not just GPU — our logic board repair service covers motherboard damage, power management chip failures, and data recovery. And if your machine has suffered water ingress, our liquid damage service should be your first port of call.
Frequently Asked Questions
Q: How do I know if my MacBook's GPU is failing?
Your MacBook will display one or more of these symptoms: pixelated artefacts on screen (coloured lines or blocks that appear randomly), severe lag when switching between applications, kernel panics or unexpected restarts, or a completely black screen despite the machine powering on. Some users also report the machine becoming very hot during normal tasks, or shutting down abruptly when running video software. If you see any of these signs, bring your machine to us for a free assessment.
Q: Can I still use my MacBook while waiting for GPU repair?
Yes, in most cases. A machine with a faulty GPU can still operate using integrated graphics (if the CPU has them), though performance will be significantly reduced. Video editing, 3D modelling, and gaming are not recommended. General web browsing and document editing are usually fine. We'll advise on safe usage during your diagnostic visit.
Q: How much does it cost to replace the GPU if reflow doesn't work?
GPU chip replacement typically costs between R3,490 and R4,890, depending on the model and the extent of secondary damage to the surrounding circuitry. This includes parts, labour, and testing. We'll provide a final quote after diagnosis.
Q: Do I need to back up my data before bringing my machine in?
Not strictly necessary — GPU failure doesn't typically corrupt your hard drive or SSD. However, we always recommend keeping a recent backup as a precaution. If your machine won't boot at all, let us know during booking; we can recover data as part of the repair process.
Q: Is GPU repair worth it, or should I just replace the machine?
For machines under four years old, repair is almost always worth it. A GPU repair at R2,000–R5,000 is far cheaper than replacing a MacBook (R15,000–R40,000 depending on model). For machines older than six years, the cost-benefit shifts; we'll give you honest advice during diagnosis rather than pushing you toward unnecessary repair.
Q: What's your warranty on GPU repairs?
All GPU repairs carry a 2-year hardware warranty. If the same fault recurs within 24 months, we repair it free of charge. If any other hardware fails within 30 days as a result of our repair (which is extremely rare), we refund your repair cost in full. We stand behind our work.
