Start here: find your exact Galaxy model
Samsung makes a lot of phones, and parts rarely carry over from one model to the next. A Galaxy S Ultra, a Galaxy A model and a Z Flip from the same year share almost nothing inside. Before you troubleshoot or ask for a quote, find your exact model.
- Open Settings and scroll to the bottom.
- Tap About phone.
- Note the Model name (for example, a Galaxy S, A or Z model) and the Model number, which starts with "SM-".
The model number matters most, because it pins down the exact version of your phone. If the phone won't turn on, check the original box or your purchase receipt, or look up the phone in your Samsung account's device list from another device. Having it ready makes any quote quicker and more accurate.
The Galaxy families at a glance
Galaxy phones fall into a few families, and each one tends to fail and get repaired in its own way.
| Family | Who it's for | Screen | Fingerprint sensor | Repair notes |
|---|---|---|---|---|
| Galaxy S (including Ultra and FE) | Flagship users | AMOLED; recent models flat, many older ones curved | Under the screen (ultrasonic on most flagship models, optical on many FE models) | Screens are often replaced together with the surrounding frame |
| Galaxy A | Everyday and budget users | Mostly AMOLED; some entry-level models use LCD | Optical under the screen or built into the side key, depending on the model | Plastic backs on many models; screens and ports are common repairs |
| Galaxy Note | Older S Pen phones | Curved AMOLED | Under the screen on later Note models | Line has ended; repair depends on part availability |
| Galaxy Z Fold and Z Flip | Foldable users | Folding inner screen plus a cover screen | Built into the side key | Inner and cover screens are separate repairs; hinge care matters |
Whichever Galaxy you have, our Samsung repair page lists what we fix. For general phone repairs across other brands, see cell phone repair.
Galaxy screens: flat, curved and folding
Flat screens
Most current Galaxy S and A models have flat screens. They're the simplest to protect, because almost any well-fitted screen protector sits flush. When the glass cracks on a modern Galaxy, the glass and display are bonded into one assembly, so the whole screen is replaced even if the picture still looks fine.
Curved screens
Galaxy Note models and many older Galaxy S flagships have glass that curves over the edges. Curves look sleek, but the edges take the hit when the phone lands on its side, and screen protectors can lift at the corners. Curved replacement screens also need more careful fitting.
Folding screens
Z Fold and Z Flip models have a flexible inner screen made of thin, bendable layers, plus a separate cover screen on the outside. The inner screen comes with a factory-applied protector that Samsung says you should not remove yourself. If that protector starts bubbling or peeling, have it looked at rather than pulling it off.
Signs the display itself is damaged
- Green, pink or white lines running across the screen
- Black blotches that spread over time
- Flickering, or a screen that stays black while the phone still rings or vibrates
- Touch that stops working in one area, or taps that happen on their own
Any of these usually means a screen replacement rather than a glass-only fix. Our cracked screen guide covers what to do right after a crack and how to decide whether to repair now or wait.
Under-display fingerprint sensors
Many Galaxy phones read your fingerprint through the screen. There are two kinds:
- Ultrasonic sensors, used on most recent Galaxy S flagships, read your fingerprint with sound waves. They work through light moisture but can be thrown off by thick or poorly matched screen protectors.
- Optical sensors, used on many A and FE models, light up your finger and take a picture of it. They need a clean, clear screen over the sensor.
If fingerprint unlock stops working, try this first:
- Clean the screen and your finger, then try again.
- If you recently added a screen protector, delete your fingerprints and register them again with the protector on.
- Check Settings > Software update and install any pending update.
- Restart the phone.
After a screen replacement you'll usually need to register your fingerprints again, and the sensor depends on a correctly fitted screen to work well. If the sensor fails after a drop and these steps don't help, it may need repair along with the screen.
Batteries and Device care
Galaxy batteries are lithium-ion, and they wear the same way every phone battery does: a little more with each charge cycle, and faster with heat. Common signs include battery life that no longer lasts the day, the phone shutting off with charge left, slow performance, or the back or screen starting to lift.
Where to check
- Device care: on recent One UI versions, open Settings > Device care (shown as Battery and device care on older versions) to see battery use and optimize the phone.
- Battery settings: look for a Battery protection option, which limits how full the battery charges to reduce long-term wear.
- Samsung Members app: its diagnostics section includes a battery status test that gives a general read on battery condition.
Safety first: if the back of your Galaxy is bulging, the screen is lifting away from the frame, or the phone rocks when you set it flat, the battery may be swelling. Stop charging it, don't press on it, and keep it away from heat and anything flammable. A swollen battery needs replacing, not watching.
Our phone battery guide explains charging habits and battery health in more depth, and our battery replacement page explains the fix.
USB-C port and the moisture warning
Most Galaxy phones show a moisture detected warning and stop wired charging if they sense liquid in the USB-C port. It's a safety feature that protects the port and battery from damage.
If you see the moisture warning
- Unplug the cable straight away.
- Wipe the outside of the phone dry and gently tap it with the port facing down.
- Leave it in a dry spot with good airflow until the warning clears. Don't use a hair dryer or other heat.
- If your Galaxy supports wireless charging, you can use that in the meantime once the outside is dry.
If the warning keeps appearing when the phone hasn't been near water, lint, debris or corrosion in the port may be the cause. A flashlight shows a lot. Loosen packed lint gently with a wooden toothpick, never a pin or anything metal. If wired charging still fails, the port may be worn. Read more on our charging port repair page, and see our water damage guide if the phone actually got wet. For liquid damage, our water damage repair page explains what can be done.
Back glass and cameras
Galaxy S and Z models generally have glass backs, while many A models use a plastic back. A cracked glass back isn't just cosmetic: shards can cut fingers, and gaps let in dust and moisture. See back glass repair for details.
Camera trouble usually comes from a cracked lens cover on the back, which makes photos hazy, or a damaged camera module, which shows up as a black viewfinder, failed focus or a lens that shakes. Clean the lens, close the Camera app and restart first. If it continues, our camera repair page explains the options.
Software problems you can often fix yourself
Not every Galaxy problem is hardware. Freezing, random restarts, apps crashing or sudden battery drain after installing something new can often be solved without a repair.
Restart and update
Restart the phone, then open Settings > Software update and tap Download and install. Update your apps from the Galaxy Store and Google Play too.
Try Safe mode
- Open the power menu with the side key (on some models, hold the side key and volume down together).
- Touch and hold Power off until Safe mode appears, then tap it.
- Use the phone for a while. If the problem disappears, a downloaded app is likely the cause.
- Restart normally to leave Safe mode, then remove recently installed apps one at a time.
When it's likely hardware
If the problem stays in Safe mode, follows a drop or water exposure, or comes with physical signs such as screen lines or a lifting back, it's probably hardware. A factory reset is a last resort, and only once your data is safely backed up.
Back up your Galaxy before any repair
Screen, battery and port repairs don't normally affect your data, but a recent backup protects you if anything unexpected happens.
- Samsung Cloud and Google: go to Settings > Accounts and backup. You can back up to Samsung Cloud and to your Google account from there.
- Photos: check that Google Photos or OneDrive is syncing, or copy your pictures to a computer.
- Smart Switch: Samsung's Smart Switch app can back up your phone to a computer or external storage, and moves data to a new Galaxy if you decide to replace it.
- Messaging apps: apps like WhatsApp have their own backup setting inside the app, so turn that on separately.
- Unlock code: know your PIN, pattern or password so you can test the phone after the repair.
Recent Galaxy phones also have a Maintenance mode in Device care settings. It restarts the phone into a separate profile so your photos, messages and accounts stay hidden while someone else is working on it.
Foldables: extra care for Z Fold and Z Flip
- Leave the factory protector on the inner screen in place.
- Don't press on the inner screen with fingernails, pens or anything sharp.
- Make sure nothing, such as a card or key, is caught between the halves before you close it.
- Keep it out of sand and pockets full of crumbs. Foldables have less protection against dust than standard phones, and grit can reach the hinge.
- A slight crease along the fold is normal. A bulge, bubble or line along the fold is not.
The inner screen and the cover screen are separate parts, so a cracked cover screen doesn't always mean replacing the folding display too.
Repair or replace your Galaxy?
Galaxy phones get software updates for a set period that depends on the model, so check how current your phone is. Under Settings > Software update you can see when it last updated. Then ask yourself:
- Is it a single problem, like a screen, battery or port, or several things at once?
- Is the phone still getting security updates?
- Apart from the damage, does it still do everything you need?
- Would replacing it mean moving all your data and setting up again?
A single-part repair on a supported phone usually makes sense. Our post on cracked screen repair vs a new phone walks through the decision, and our used phone buying guide helps if you decide to replace it. Changing carriers? Our phone unlocking page and post on phone unlocking in Ontario explain how it works in Canada.
How at-home Galaxy repair works
Woman Wireless On The Go has no storefront. A certified woman technician comes to your home, workplace, parked car or condo lobby.
- Send your model number and the problem online, by phone or on WhatsApp.
- Get a free quote before any work starts.
- Confirm a time. Online requests book into morning, afternoon or evening windows, then the exact time is confirmed by phone or WhatsApp.
- The technician does the repair on the spot.
- You test it together: touch, fingerprint, cameras, charging and calls.
She confirms timing for your repair when she quotes. Our at-home phone repair guide explains more.
Need a hand?
If your Galaxy needs more than a restart, we'll come to you. We cover Mississauga, Brampton, Milton, Oakville, Burlington, Halton Hills and Toronto. Send your model number and what's wrong, and you'll get a free quote before any work starts. Call or WhatsApp (365) 351-4247, message us on WhatsApp, or book online.
Frequently asked questions
How do I find my Samsung Galaxy model number?
Open Settings, scroll down and tap About phone. You'll see the model name and a model number starting with SM-. The model number identifies your exact version, which is what a technician needs to quote the right parts.
Why does my Samsung say moisture detected when it isn't wet?
The warning can be triggered by lint, debris or corrosion in the USB-C port, not just water. Unplug it, let the phone sit somewhere dry, and check the port with a flashlight. If the warning keeps returning, the port may need cleaning or repair.
Will my fingerprint sensor work after a Samsung screen replacement?
Under-display sensors read through the screen, so they depend on the replacement being fitted correctly. You'll usually need to register your fingerprints again afterward. Thick or mismatched screen protectors can also stop the sensor working well.
How do I check battery health on a Samsung phone?
Open the Samsung Members app and run the battery status test in its diagnostics section. You can also check battery use in your Device care settings. If the phone shuts off with charge left or the back is lifting, the battery likely needs replacing.
Can a Galaxy Z Flip or Z Fold screen be repaired?
Yes. The folding inner screen and the outer cover screen are separate parts, so each can be replaced on its own. Leave the factory protector on the inner screen in place, and have bubbles or peeling looked at instead of removing it.
Should I back up my Samsung before a repair?
Yes. Go to Settings, then Accounts and backup, to save your data to Samsung Cloud or Google, or use Smart Switch to back up to a computer. Repairs don't normally affect data, but a backup protects you if anything goes wrong.