Ask three different repair shops for a screen replacement quote and you can get three noticeably different prices for what sounds like the exact same job. The reason almost always comes down to the part being fitted, not the labour. Understanding what “OEM” and “aftermarket” actually mean, and where the real quality differences lie, is the difference between a repair that feels exactly like the original and one that leaves you with a screen that never quite looks or feels right.

Quick answer

  • OEM (Original Equipment Manufacturer) parts are made to the same specification as the part that originally shipped in your device, often from the same factories that supply the manufacturer.
  • Aftermarket parts cover a huge range, from high-quality compatible parts that perform almost identically, down to poor quality generic parts that cause real problems.
  • Screens and batteries show the biggest quality gap between good and bad aftermarket parts. Charging ports and speakers show less variation.
  • Using non-genuine parts does not automatically void your statutory rights or a repairer’s own warranty, though it can affect specific manufacturer warranty claims.
  • A price far below everyone else’s for the same repair is the clearest sign of a lower quality part, more reliably than any marketing claim on either side.

What “OEM” actually means (and what it does not)

OEM stands for Original Equipment Manufacturer. In the repair world, it is used to describe parts made to the same specification, and very often by the same component factories, as the parts that shipped inside your device when it was new. This is different from “genuine Apple” or “genuine Samsung” parts, a term that technically only applies to parts sourced directly through the manufacturer’s own authorised channels.

In practice, most independent repairers cannot buy stock directly from Apple or Samsung’s authorised parts programmes for every repair type, so “OEM” in an independent repair context usually means a high quality, original-specification part pulled from the same supply chain, tested to match the performance of the factory original as closely as possible. This is a meaningful, real distinction from cheap aftermarket parts, even though it is not identical to a manufacturer-branded part.

What counts as “aftermarket”

Aftermarket is a much broader category than people expect, and lumping it all together is where a lot of confusion comes from. It genuinely spans two very different things.

  • High quality compatible parts from established manufacturers who specialise in producing components to match or closely approach original specifications. These often perform within a small, barely noticeable margin of an OEM part.
  • Low quality generic parts, mass produced with minimal quality control, cheaper materials, and no meaningful testing standard. These are where the real, noticeable problems come from: dull colours, poor touch response, or batteries that report a false charge percentage.

The word “aftermarket” on its own tells you almost nothing about which of these two categories a part falls into. The repairer’s own standards and sourcing are what actually determine that.

Screen quality differences explained

Screens show the widest quality gap of any commonly replaced part, and it is usually the most noticeable to you as the owner.

  • Panel type. Many recent iPhones and flagship Android phones use OLED or AMOLED panels for true blacks and vivid colour. Some low quality aftermarket “OLED” screens are actually LCD panels with an OLED-style backlight arrangement, which look noticeably different, especially in dark scenes and at an angle.
  • Colour accuracy and brightness. Cheaper panels often run cooler or warmer than the original, and struggle to reach the same peak brightness outdoors.
  • Touch sensitivity and digitiser thickness. A poor quality digitiser layer can feel slightly less responsive, or sit fractionally proud of the frame, which is often what people mean when a repaired screen “just feels a bit off”.
  • Auto-brightness and True Tone sensors. On iPhone, True Tone adjusts the display’s colour temperature to match ambient lighting. This relies on the original screen’s serial number being recognised by the device, so a straightforward part swap without proper reprogramming tools can disable it, regardless of whether the new screen is OEM or aftermarket.

A genuinely good aftermarket screen from a reputable supplier can be very difficult to tell apart from an OEM part in day to day use. A poor one is usually obvious within the first day, in colour, brightness or touch response.

Every model has its own part costs and options. See our iPhone screen repair, Samsung screen repair and Google Pixel screen repair pages for model-specific pricing.

Battery quality differences explained

Batteries carry a genuine safety dimension that screens do not, which makes quality even more important here.

  • Actual vs advertised capacity. A battery labelled with the same milliamp-hour rating as the original does not guarantee it genuinely delivers that capacity. Poor quality cells commonly report a higher percentage than what is actually available, meaning the phone dies well before it reaches 0 percent.
  • Battery management chip compatibility. Modern phones use a small chip inside the battery pack to communicate health and charge data to the device. A mismatched or absent chip can cause inaccurate percentage readings, unexpected shutdowns, or a persistent battery health warning even on a brand new part.
  • Cell quality and safety certification. Reputable battery cells go through genuine safety testing and certification. Very cheap, uncertified cells carry a meaningfully higher risk of swelling or, in rare but serious cases, overheating. This is one area where paying a little more for a properly certified part is a safety decision, not just a quality one.

Model-specific battery pricing is available on our iPhone battery replacement, Samsung battery replacement and Google Pixel battery replacement pages.

Camera, speaker, charging port and other components

These parts show a smaller, though still real, quality gap. Camera modules can differ in image sharpness and low light performance if the lens or sensor grade is lower than original. Speakers can sound noticeably thinner or distort at higher volumes if the driver quality is poor. Charging ports and their connecting flex cables are more mechanical than these other components, so the main risk with a poor quality part is a shorter working life or a looser physical connection over time, rather than an immediately obvious difference on day one.

A worked example: why three quotes for the same repair can differ so much

Imagine getting three quotes for the same cracked iPhone screen. One shop quotes noticeably below the other two, one sits in the middle, and one is the most expensive. This is almost never random.

The cheapest quote is very often a lower grade LCD-style panel sold as a straight replacement, sometimes with reduced touch sensitivity or a slightly duller display, and frequently a shorter or non-existent warranty. The middle quote is typically a good quality aftermarket or refurbished OEM panel, close to original performance, with a fair standard warranty attached. The most expensive quote is usually a fully genuine or top-tier OEM part, often with the longest warranty and the closest possible match to factory original, including True Tone functionality if the right reprogramming tools are used.

None of these three is automatically the “wrong” choice. The right one depends on your device, your budget, and how long you plan to keep the phone. The mistake is assuming the price difference is pure profit margin rather than a genuine difference in what is being fitted.

“Unable to verify this part”: what those warning messages actually mean

Newer iPhones sometimes show a notification after a screen, battery or camera replacement along the lines of “Unable to verify this iPhone has a genuine Apple part”. This causes a lot of unnecessary alarm, so it is worth explaining exactly what it does and does not mean.

This message appears because each of these components is paired to the device’s internal serial number at the factory. When a part is replaced, even with a genuine part sourced outside Apple’s own authorised repair programme, the phone cannot automatically re-verify that pairing itself. For a screen, this notification is generally cosmetic. The screen works completely normally, including touch and display quality, though features tied to the original pairing such as True Tone or automatic brightness matching can be affected unless proper reprogramming tools are used during the repair to re-establish that pairing.

For a battery, the notification is usually paired with a battery health screen that simply shows “unknown part” rather than a percentage, though the battery still charges and functions normally. For camera modules on the very newest models, Apple has tied some functionality more tightly to verified pairing, which is worth asking your repairer about directly if camera performance after a repair matters a great deal to you.

The practical takeaway: these messages are a notification, not usually a functional block, but a repairer using the right tools to properly re-pair components where possible will leave you with fewer of these warnings and closer to original functionality than one who does not.

Does using non-OEM parts void your warranty?

Not automatically, and not entirely. Your statutory rights under the Consumer Rights Act 2015, and any warranty offered directly by the repairer on their own work, are separate from a manufacturer’s own warranty policy and remain intact regardless of which parts were used. What can genuinely happen is a manufacturer declining to cover a specific fault that was directly caused by a third-party part or a poor installation, while the rest of the device’s manufacturer warranty stays valid. We cover this distinction fully, including the legal detail, in our guide to right to repair in the UK.

Why genuine and OEM parts cost more: what you are actually paying for

The price difference is not simply markup. Higher grade panels and cells cost more to manufacture, quality testing and certification add cost at every stage, and sourcing through more reputable supply chains carries a premium over the cheapest generic option available. A repairer using better parts is also usually absorbing a higher failure and replacement rate on cheap stock avoided altogether, which is a cost that gets passed on somewhere either way, either in price or in how many repeat repairs a shop ends up doing for free.

When it is worth paying more for OEM or premium parts

  • On a current flagship device where colour accuracy, brightness and touch feel matter to daily use.
  • On a screen repair, since this is where quality differences are most noticeable and most permanent to live with.
  • If you plan to sell or trade in the device later, since a poor quality repair is often noticed and can reduce resale value.
  • On a camera module, where sensor and lens quality genuinely affects photo results in a way most people notice quickly.

When good quality aftermarket parts are a smart choice

  • On an older or budget device where a full-price OEM part would cost close to what the phone itself is worth.
  • For batteries specifically, where a reputable aftermarket cell from an established supplier performs very close to original at a noticeably lower cost.
  • For a phone you intend to keep for a shorter period, such as a temporary or secondary device.

The key word throughout is reputable. A good quality aftermarket part from a supplier with a track record is a completely different product from the cheapest unlabelled part available online, even though both fall under the same “aftermarket” label.

Why part quality is likely to matter even more in future

Regulation is starting to catch up with this issue. The EU’s Ecodesign rules for smartphones, which already apply in Northern Ireland, set minimum durability standards for spare parts, including batteries that must retain at least 80 percent of their original capacity after 800 full charge cycles. As these kinds of standards spread, whether through direct regulation or simply because manufacturers build parts to one global standard, the gap between a properly certified part and a cheap uncertified one is likely to become an even bigger factor in how long a repair actually lasts. Our full guide to right to repair in the UK covers what these rules currently require and where they apply.

Does this apply to laptop and tablet parts too?

The same principles apply beyond phones. MacBook and laptop screens, batteries and keyboards show similar quality variation between OEM and generic aftermarket parts, and the same “ask what grade of part you are getting” approach applies just as much here.

  • Laptop screens vary in brightness, colour accuracy and viewing angle in much the same way phone screens do, and are worth asking about directly, especially on machines used for photo or video work.
  • Laptop batteries carry the same safety considerations as phone batteries, arguably more so given their larger size, making cell quality and certification just as important.
  • Keyboards and trackpads show less dramatic quality differences, though cheaper replacement keyboards can develop sticky or unresponsive keys sooner than a higher quality part.

See our MacBook repairs, laptop repair, HP laptop repair, Dell laptop repair and Lenovo laptop repair pages for model-specific options and pricing.

How to spot a poor quality part after a repair

If you have already had a repair done elsewhere and are wondering whether the part quality is the reason something feels off, these are the tell-tale signs.

  • Screen ghosting or a faint image “burned” into the display shortly after the repair, rather than after years of use, which points to a lower grade panel.
  • Touch response that feels delayed or misses taps near the very edges of the screen, especially in corners.
  • A visible colour tint, often slightly blue, yellow or pink compared to how the display used to look, particularly noticeable on a plain white background such as a notes app.
  • A battery percentage that drops unevenly, sitting at a stable number for a while and then dropping sharply, or a phone that switches off unexpectedly before reaching 0 percent.
  • A screen or back glass that sits slightly proud of the frame, or gaps at the edges, which points to either a poor quality part or a rushed installation rather than the part itself.

If you notice any of these within the warranty period of a previous repair, it is worth going back to whoever carried it out before assuming you need to pay for a second repair entirely.

How to tell if a repair shop is using good quality parts

You cannot inspect a part before it goes into your phone, so you have to judge the shop instead. A few honest questions tell you most of what you need to know.

  • Ask directly what grade of part they use, and whether OEM or premium aftermarket options are available. A shop that cannot or will not answer clearly is a warning sign in itself.
  • Check the warranty length. A short or non-existent warranty on parts usually reflects the shop’s own confidence in what they are fitting.
  • Compare the price against several other quotes for the exact same model and repair. A significant outlier on the low side is rarely a bargain.
  • Read reviews that mention long-term results, not just the initial repair experience, since poor quality parts often only reveal problems after a few weeks or months of use.

What parts do we use?

We offer OEM and premium quality aftermarket options depending on the device and your priorities, and we are upfront about which is which and why the price differs, rather than presenting every option as identical. Every repair carries a warranty on both the part and the workmanship, and we will always tell you honestly if a cheaper option is not worth the trade-off on a particular device.

Frequently asked questions

Can I ask which parts will be used before I book a repair?

Yes, and you should. Any reputable repairer will tell you clearly what grade of part is being fitted and what the price difference reflects.

Will an aftermarket screen look different from the original?

A good quality one, very little if at all. A poor quality one, often noticeably, particularly in colour accuracy, brightness and how the display looks in dark scenes.

Do aftermarket batteries degrade faster than OEM ones?

Poor quality ones often do, and can also report inaccurate battery percentages from day one. A reputable aftermarket battery from an established supplier typically performs very close to an OEM part over its lifespan.

Is it illegal for a repairer to use aftermarket parts without telling me?

Under UK consumer law, goods and services must be as described. If you were quoted for or told you were receiving one grade of part and a different, lower grade part was actually fitted without your knowledge, that is a misrepresentation you can challenge.

Does Apple or Samsung’s own repair service always use better parts than an independent repairer?

Manufacturer repair channels use fully genuine parts by definition, but a good independent repairer using genuine OEM-grade parts can offer very comparable quality, usually at a lower price and often faster turnaround.

Book a repair with parts you can trust

Now that you know what actually separates a good repair from a disappointing one, you know exactly what to ask before booking anywhere. We are always upfront about the parts we use and why, on every device we work on.

Curious what the rest of the repair process looks like once you have chosen your parts? Read our full guide on what happens during a phone repair, or contact us directly for a free quote with no obligation.

Back to posts
Request a quote