Logic Board & Micro-Soldering Repair Explained (2026): When the 'Unfixable' Is Fixable
When a phone or laptop "won't turn on," most repairers reach the same dead end. They test the screen, swap the battery, try a different charger – and when none of that works, they tell you the board has gone and the device is finished. The manufacturer says much the same thing, except they call it a "logic board replacement" and quote you a figure not far off the price of a new device.
There is a third option very few shops offer, and it's the deepest part of what we do at celltech: component-level repair, also called micro-soldering or board-level repair. Instead of binning the whole board, we diagnose the single failed part – a charging chip the size of a grain of rice, a cracked capacitor, a lifted pad – and replace just that. This guide explains what that means, what is genuinely repairable, and where the honest limits are.
Direct answer: Logic board (micro-soldering) repair fixes the individual electronic components on a device's main board – the charging IC, backlight circuit, audio chip, power-management IC and so on – rather than swapping the entire board. It is the repair most high-street shops and even manufacturers will not attempt: they replace the whole board, which costs far more and, on modern Apple devices, wipes your data with it. At celltech, board-level diagnostics are £24.95 (deducted from the repair if you proceed), board work carries a 120-day guarantee, and because we repair your existing board your data stays exactly where it is.
What the logic board actually is
The logic board – the motherboard on a Windows laptop, the mainboard on a phone – is the single circuit board everything else plugs into. It carries the processor, memory, storage, power-management circuitry, the radios, and dozens of small integrated circuits ("ICs" or chips) that each do one job: manage charging, drive the backlight, run the audio, handle the cameras.
Those chips connect to the board through hundreds of microscopic solder joints, many hidden underneath the chip itself. The board is built in layers – a modern phone board stacks ten or more layers of copper traces thinner than a human hair. When one component or joint fails, the whole device can appear dead even though 99% of the board is perfectly healthy. The skill of board-level repair is finding the 1% that has gone wrong.
What micro-soldering is (and why so few shops do it)
Micro-soldering is soldering at a scale you cannot do by hand with an ordinary iron. The components are often smaller than a full stop, and the chips underneath are attached with arrays of tiny solder balls (BGA, or ball-grid array packaging). Working at this level needs a specific bench setup and, frankly, a lot of practice:
- A stereo microscope – you simply cannot see what you're doing otherwise. Most board work happens at 7x to 40x magnification.
- A hot-air rework station – a precisely controlled stream of hot air to lift and reseat chips without cooking the components next to them.
- A preheater – to bring the whole board up to temperature gently, so the heat needed to remove one chip doesn't crack the board or disturb neighbouring parts.
- Flux, leaded and lead-free solder, solder paste and braid – the consumables that make a clean, reliable joint.
- Schematics and boardview files, a multimeter and often a thermal camera – to trace a fault to its source rather than guessing, by measuring where current is leaking or where a short is heating up.
The reason most repairers don't offer this is simple: it's genuinely difficult, the equipment is expensive, and the learning curve runs into years. It's far easier to build a business around swapping screens and batteries – valuable repairs, but neither touches the board. Component-level repair sits at the top end of the trade, and it's where the gap between a generalist shop and a specialist is widest.
Common board faults that are genuinely repairable
Not every "dead" device is a board fault, and not every board fault is economical to fix – we'll come to that. But these are the faults we see and repair most often, and which a screen-and-battery shop would simply write off:
- Charging IC / "Tristar" faults – the chip that negotiates charging and data over the port. When it fails, the device won't charge, charges intermittently, or isn't recognised by a computer – even with a brand-new port and cable.
- Backlight circuit – the display turns on (you can see a faint image at an angle) but there's no backlight. A blown backlight filter, coil or driver IC, often after a screen replacement gone wrong, is a classic repairable fault.
- Audio IC faults – greyed-out call buttons, a microphone that doesn't work, or the phone hanging on the spinning wheel during boot. On certain iPhone models this is a well-known board-level fault caused by a marginal solder joint flexing over time.
- Power-management IC (PMIC) faults – no power at all, boot loops, or rapid battery drain that a new battery doesn't fix.
- Baseband / signal faults – "no service" or "searching" that survives a SIM swap and a network reset.
- Broken or lifted pads and traces – the most common cause of a device that died after a botched repair. The pad a connector solders to has torn off the board; we rebuild it.
- Liquid corrosion – water leaves conductive residue and eats away at copper. Ultrasonic cleaning plus targeted component replacement often brings a "drowned" board back to life.
Board repair vs board replacement: the cost and data difference
Here is the heart of it. When a manufacturer diagnoses a board fault, their fix is almost always to replace the entire logic board with a new or refurbished one. That has two consequences most people don't find out until it's too late.
It costs far more. You're paying for a whole board, not the one component that failed. A single charging-chip repair is a fraction of the price of a complete board swap – same outcome, far lower cost.
It wipes your data. This is the part that genuinely catches people out. On modern Apple Silicon devices – recent iPhones, iPads and Macs – the storage (the NAND that holds your photos, messages and files) is soldered onto the logic board and cryptographically paired to it. Replace the board and you replace the storage; your data goes in the bin with the old one. The manufacturer says to back up first, but if the device won't turn on, you can't. Your data is effectively held hostage by a single failed chip.
Because we repair the board you already own, your data stays exactly where it is. We fix the failed component; your storage, settings and files are untouched. And in the cases where a board is too far gone to keep in service, we can often still perform a recovery-focused repair – reviving the board just long enough to pull your data off, or transferring the storage chip itself. Our data recovery from a dead phone guide explains how that works in practice.
What board-level repair costs at celltech
We publish our pricing rather than hiding it behind a "contact us for a quote" wall. Because a micro-soldering job depends on which component failed, the most honest way to price it is a fixed, low diagnostic fee first, then a clear quote.
Board-level diagnostics are £24.95, deducted from the repair if you go ahead. Standard repairs (screens, batteries) include free diagnostics – the fee applies to board-level investigation, which takes real bench time and equipment. The table below shows our published board-level pricing for the device families where a board service is a fixed-price job.
| Board-level service | celltech published price |
|---|---|
| Board-level diagnostics (any device) | £24.95 (deducted if you proceed) |
| iPhone board repair (charging / backlight / audio / power IC) | Quoted after the £24.95 diagnosis |
| iPad Pro (M4, 11" / 13") logic board | £249.95 |
| iPad Pro (M5, 11" / 13") logic board | £269.95 |
| iMac (21.5" through 24" M4) logic board | £219.95 – £349.95 |
| Windows laptop motherboard (HP, Dell, Lenovo, Razer) | from £209.95 |
| iPad data recovery (from a dead board) | £149.95 – £169.95 |
| iMac data recovery (from a dead board) | £149.95 – £179.95 |
We don't quote a single flat figure for iPhone micro-soldering, because a lifted pad, a charging IC and a complex liquid-corrosion job are very different amounts of work. After the £24.95 diagnosis you get a firm price before any work starts, and you decide. You can see our full iPhone repair pricing on the device pages, and our Mac repair vs Apple cost comparison shows where independent board-level repair saves the most against a manufacturer board swap.
The honest limits: when a board isn't worth repairing
A good specialist tells you when not to repair. Micro-soldering is remarkable, but it isn't magic, and there are genuine situations where board repair is the wrong answer:
- Severe physical or liquid damage across the board. If corrosion or impact has destroyed multiple layers, traces under chips, or the processor itself, a reliable repair may not be achievable – or the work involved costs more than the device is worth.
- The main processor or paired storage has failed outright. On devices where storage is locked to the chip, a dead processor can mean the data genuinely cannot be recovered, and the board can't be returned to service.
- The economics don't stack up. If a board repair would cost more than a sensible second-hand replacement, we'll say so. Our job is to give you the honest number, not to talk you into a repair.
This is exactly why we charge a small, fixed diagnostic fee rather than promising the world up front. Sometimes the most valuable thing a diagnosis tells you is that the right move is data recovery and a replacement device – and you'll have spent £24.95 to know that for certain rather than gambling. If you're weighing that up, when is a phone beyond economical repair sets out the maths clearly.
How the mail-in board service works
celltech is a UK-wide mail-in repair specialist, which suits board-level work particularly well – this is bench work done under a microscope, not a while-you-wait counter job, so where you live makes no difference to whether you can use us.
- Book online and post it in. Every inbound and outbound shipment is tracked and insured both ways, so your device is covered from the moment it leaves your hands.
- We diagnose at board level for £24.95. Under the microscope, with schematics and instruments – not a five-minute glance. You get a firm quote before any soldering happens.
- You approve the price, we repair the component, test the device thoroughly, and post it back fixed – with your data intact, because we never touched your storage.
Board-level and liquid-damage repairs carry a 120-day guarantee – longer than the 90 days a manufacturer typically offers on an out-of-warranty repair. Standard component replacements (screens, batteries and similar) carry a 27-month guarantee, more than double the 12 months most independent UK repairers offer. We cover roughly 2,467 device models and hold a 4.8-star rating; published pricing, a long guarantee and genuine board-level capability are what we'd ask you to judge us on.
Frequently asked questions
What is the difference between logic board repair and logic board replacement?
Repair means diagnosing and replacing the single failed component on your existing board – a charging chip, a backlight coil, a torn pad. Replacement means swapping the entire board for a new or refurbished one, the manufacturer's standard approach. Repair is usually far cheaper for the same outcome and keeps your data; replacement on modern Apple devices wipes it, because the storage is soldered to the board being thrown away.
Will I lose my data during a board-level repair?
No – that's the central advantage. Because we repair the board you already own rather than replacing it, your storage is never removed and your photos, messages, apps and settings stay exactly as they were. Even where a board can't be fully returned to service, we can often still recover your data first.
How much does micro-soldering repair cost?
Board-level diagnostics are £24.95, deducted from the repair if you proceed. The repair itself depends on the fault: we publish fixed board prices for Apple desktops and tablets (an iMac logic board is £219.95 to £349.95, an iPad Pro logic board £249.95 to £269.95, a Windows laptop motherboard from £209.95). For iPhone micro-soldering, we give a firm quote after the diagnosis rather than a misleading flat figure.
Why won't Apple or most shops do board-level repair?
Manufacturers design their service around fast, standardised module swaps – replacing a whole board is quicker and needs no diagnostic skill. Most independent shops don't do it because micro-soldering needs a microscope, a hot-air station, a preheater, schematics and years of practice. It's the specialist end of the trade – which is why a board fault one shop calls "unfixable" is often routine for another.
My phone got wet and won't turn on – is that repairable?
Often, yes. Liquid leaves conductive residue and corrodes the copper on the board, but ultrasonic cleaning combined with replacing the specific components the water damaged frequently brings a board back to life. The sooner it reaches the bench the better, as corrosion spreads over time. Even if the board can't be saved, liquid-damaged devices are often strong candidates for data recovery.
Can you fix a device that another shop or the manufacturer has already worked on?
Yes – in fact, botched previous repairs (lifted pads, damaged connectors, backlight circuits blown during a screen swap) are a large share of what we see. We assess the board on its own merits regardless of who touched it before, and tell you honestly whether it's repairable and what it will cost.
What guarantee comes with board-level repair?
Board-level and liquid-damage repairs carry a 120-day guarantee, reflecting the complexity of component-level work and exceeding the 90 days a manufacturer typically gives on an out-of-warranty repair. Standard component replacements such as screens and batteries carry our 27-month guarantee, which is more than double what most independent UK repairers offer.
What if you diagnose it and it turns out not to be worth repairing?
Then you've spent £24.95 to know for certain, rather than gambling on a guess. We'll explain why, talk you through the options honestly – including data recovery and a sensible replacement device – and never push a repair that doesn't make financial sense for you.