A cracked laptop case can often be repaired, but only if the crack is cosmetic. A short crack on an outer edge, away from the hinges, can usually be bonded with plastic-rated two-part epoxy. A crack at a hinge, near the battery, or one that lets the lid or base flex means the plastic is carrying load, and the right fix is usually a replacement shell section. This guide shows you how to tell which case you have, how to do the epoxy repair safely, and how to match a replacement part to your exact model.
TL;DR
- Short crack on an outer edge, no flex, laptop closes flat: clean it and bond it with two-part epoxy rated for your plastic.
- Crack at a hinge, screw post or corner that lifts when you open the lid: stop opening the laptop and plan to replace the damaged section.
- Swollen battery, bulging case, heat or odor: power off, do not charge, do not press or glue the case, and get qualified service.
- Match replacement parts by full model number, revision and part number, never by how similar a shell looks.
- After any repair, test the full lid range, the screen at every angle and the wireless connection.
Table of Contents
- Cosmetic or structural: the first decision
- How to tell if the hinge or internals are involved
- When it is unsafe: stop before you glue
- Warranty and who pays
- Repairing a cosmetic crack with epoxy
- When to replace the case part instead
- Finding the right replacement part
- Checks after the repair
- Our perspective
- Get the parts and tools in one order
- FAQ
- Sources
Cosmetic or structural: the first decision
Every repair choice starts here. A laptop shell is not just a cover. It holds the hinges, ports, cooling parts, battery and system board in position, and when that structure is compromised, a quick patch can lead to cable strain, cracked boards, overheating or a damaged screen.
One practical rule separates the two types. A short crack on a non-load-bearing exterior edge may be cosmetic, while a crack that flexes, spreads, separates a panel or touches a hinge mounting boss is structural.
Use this quick sort:
| What you see | Likely category | Usual next step |
|---|---|---|
| Scratches, chips, discoloration | Cosmetic | Leave it, or fill and smooth it |
| Hairline crack on a side or bottom edge, no flex | Cosmetic | Epoxy bond |
| Crack that spreads or flexes when you press the area | Structural | Replace the section |
| Crack at a corner near a hinge | Structural | Inspect the hinge path, likely replace |
| Crack around a screw post or boss | Structural | Rebuild the post or replace the part |
| Gap between keyboard deck and bottom cover | Possible internal pressure | Check the battery first |
The same crack can be either one depending on where it sits. When in doubt, treat it as structural until you have checked the hinge and the battery area.
How to tell if the hinge or internals are involved
The visible crack is often the symptom, not the cause. Look for a case separating near a corner, a gap between the keyboard deck and the bottom cover, or a screen bezel that lifts as you move the lid. Forcing the lid in that condition can damage the display or tear a cable.
Do this check with the laptop powered off and unplugged:
- Open and close the lid slowly while watching the hinge area from the side.
- If the hinge bracket moves against the chassis, suspect loose hardware, stripped inserts or a broken mounting boss. Play inside the hinge barrel itself points to a worn hinge assembly.
- Look for cracked plastic around screw posts, or a metal insert that has lifted or turned.
- Notice any stiff, catching or uneven movement. A hinge that binds puts the same stress on the case again, so a glued crack will simply reopen.
- Check both hinges. Damage on one side often means the opposite hinge has become too tight.
A crack that appears only when you open the lid usually points to loose screws, broken mounting posts, excessive hinge tension or a damaged hinge, and gluing the visible line alone often fails.
Screen flicker as the lid moves is another warning. It can mean the display cable or connector is strained, so the cable needs checking before any case work. Also remember that after a hard drop, the motherboard can crack internally even if the case only shows a dent or corner damage. If the laptop behaves oddly after the impact, the case is not the only thing to assess.
If the hinge itself is the problem, a hinge or bracket replacement is a different job from a shell repair. For a sense of what it costs when a shop does it, laptop hinge repair cost in the U.S. runs from $60 to $700 depending on the damage and the machine.
When it is unsafe: stop before you glue
Some damage is not a case repair at all. Stop using the laptop if the hinge binds, the case separates or cables show damage. Do not open or work on a battery that is swollen, punctured, leaking, unusually hot or smelly, and arrange qualified service.
A bulging base or a keyboard deck pushed up from below is the classic sign. If the case is bulging, hot or producing an odor, do not press, clamp, puncture or glue it, and arrange a battery inspection or professional repair. A swollen lithium-ion battery is a safety issue, not a cosmetic one. Keep the laptop off and uncharged. If it is hot, smoking or hissing, move away from it and call 911 or your local fire service.
Two more cases where a cosmetic fix is not worth it: a crack that exposes the battery, a cable or a sharp metal edge, and a case where the hinge area lifts, pops or cracks as you open it, or the vents and fan mounts are broken.
Warranty and who pays
Check your warranty terms before you open anything. ASUS, for example, states that its warranty does not cover cracks or breakage on the outer surface or hinge damage, and that authorized service centers may offer repairs for this kind of damage with both parts and labor charged. Other makers have their own terms, so read yours. Opening the laptop yourself may affect any coverage that remains.
Repairing a cosmetic crack with epoxy
If your crack passes the cosmetic test, a careful epoxy job can stabilize it. Cleaning the area, bonding it with two-part epoxy and leaving it fully cured before use is the approach most guides agree on.
What you need
- Two-part epoxy suited to your case plastic
- Isopropyl alcohol and lint-free cloths
- Fine sandpaper for light roughening
- Masking tape, toothpicks and a small mixing surface
- Nitrile gloves and safety glasses
- A precision screwdriver set to open the laptop if the crack runs along an inner edge, such as our 65-in-1 precision screwdriver set or the 25-in-1 manual screwdriver set
- A divided storage box so screws stay sorted by location
Steps
- Power down and disconnect. Shut the laptop down and unplug the charger. Manufacturer service procedures, such as ASUS’s service overview, call for power off, AC disconnected, rings and watches removed and a ground strap worn against static discharge. Follow the same habits at home.
- Protect what is nearby. Tape off the keyboard, screen edges and ports. Keep cables out of the work area.
- Clean and dry. Wipe both sides of the crack with alcohol and let it dry completely.
- Roughen lightly. A gentle scuff gives the epoxy something to grip. Do not change the alignment of any hinge area.
- Mix at the stated ratio. Mix only what you need, in the ratio on the pack.
- Apply sparingly. Fill and reinforce the damaged area. Keep epoxy out of screw holes and threads, the hinge barrel, display cables, vents and case clips.
- Hold and wait. Leave it undisturbed for the full handling and cure time. Work in a ventilated area and follow the maker’s safety instructions.
Do not pour glue into a gap, and do not drill an assembled laptop without seeing the internal layout, since this may damage cables or block later disassembly.
Choosing the adhesive
The wrong glue can damage the plastic. Cyanoacrylate (super glue) causes stress cracking in polycarbonate and should not be used on those parts, while the same source notes that two-part epoxy gives very high bond strength for structural joints on dissimilar materials, with a 5 to 60 minute working time.
Check the data sheet for your product. As one example, Henkel’s UniBond Repair Power Epoxy has a 1:1 mix ratio, sets initially in 5 minutes at 23°C, allows rough handling after 4 hours and reaches full strength after 24 hours. The same sheet lists it as suitable for ABS, rigid PVC, polystyrene, polycarbonate and acrylic, but not for polypropylene, polyethylene or PTFE. Always read the sheet for the epoxy you actually buy, and match it to the plastic in your case. Many laptop shells are ABS or polycarbonate blends, but check what your model uses.
Screw posts
A broken screw hole needs more than surface glue. The plastic boss must be rebuilt with two-part structural epoxy putty, or the brass standoff reinstalled. Expect fast-set in 5 to 10 minutes for shaping, a safe-to-handle stage at 1 to 4 hours, and full strength at about 24 hours, when you can torque screws. If the post is extensively broken, move to replacement.
When to replace the case part instead
Glue is a repair for limited damage that does not carry major load. Plastic repair is worthwhile when the damage is limited, the laptop still closes correctly and the area does not carry major mechanical load. Replacement is the better path when broken plastic affects the display hinges, motherboard mounts, cooling path, battery area or chassis alignment.
Replace the part when:
- A hinge mount is torn out or a brass insert has pulled free. An adhesive-only repair then carries repeated hinge torque and is inherently less certain.
- The hinge bosses or screw posts are extensively broken, the plastic is deformed, or repaired material cannot hold screws securely.
- The crack spreads or the panel flexes under light pressure.
- The laptop is your daily machine. Epoxy on a housing near the hinge may buy weeks to months of use, but a glued housing will likely fail again under repeated daily stress.
Which section you replace depends on where the damage is: the lid or display back cover, the bezel, the palm-rest assembly or the bottom case. Replacing only the broken section is usually cheaper than a complete housing.
Finding the right replacement part
Mismatched parts are the most common reason a replacement fails. A shell that looks identical can differ in hinge side, mounting-hole pattern or screen-size support.
- Get the full identifiers. Read the complete model number, revision and product or service number from the label on the underside.
- Check the official parts list. Use the maker’s parts list or service manual, or a reputable supplier that publishes compatibility details.
- Compare the details. Part number, hinge side, shape, mounting-hole pattern, threaded inserts, screw type and length, screen-size compatibility and clearance for display cables.
- Do not assume. Do not assume a part from a similar-looking model or a different revision will fit.
Service manuals help here. ASUS’s repair manual for the X415DA, for example, says that part numbers in the guide are for reference only and exact ordering numbers come from the OrderBook. It also states the hinge screw torque and that, when replacing hinges, the left and right hinge covers must come from the same vendor. Your own model’s manual will have its own figures, so use those.
If you are opening the laptop anyway, it is also worth reading our guide to laptop keyboard replacement, since the keyboard deck often comes apart in the same sequence as the case.
Checks after the repair
A repair is done when the laptop behaves normally through every movement, not when the epoxy looks tidy.
- Open and close the lid through its full range repeatedly.
- Watch the screen for flicker at every angle.
- Confirm the wireless connection holds while you move the lid.
- Make sure the laptop closes flat.
- If sound, video or wireless fails after reassembly, check the internal cable connections first, since one may have been missed or seated badly.
If you see flicker, a lid that will not stay put or cracking sounds, stop and reopen the machine. Those are signs the cable or hinge path needs attention, not more glue.
Our perspective
We see the same pattern in repair orders: people buy glue for a problem that is really a hinge or mounting-post problem, then come back for the part they needed in the first place. The part that matters is the one that fits your exact model.
That is why we put compatibility first. Detailed product descriptions and compatibility checks are the core of how we work, and our support team can help you confirm a match before you order. If the part turns out to be wrong or unsatisfactory, our money-back guarantee covers it.
For a small crack, a good epoxy job with the right tools is a sound weekend repair. For structural damage, a replacement section and a proper screwdriver set will serve you better than any patch. Both paths start with a clear diagnosis, and we built our catalog to support both.
the author
Get the parts and tools in one order
Whether you are patching a corner or swapping a shell section, we carry the repair tools, replacement parts and accessories for phones, tablets and laptops in one place, with compatibility information on each product and worldwide shipping.
Browse our repair parts and tools for precision screwdriver sets, pry tools and replacement components. For opening tight shells without cracking more plastic, a curved-edge steel pry tool is a good addition to the kit.
FAQ
Can I use super glue on a cracked laptop case?
It is not the best choice. Cyanoacrylate can cause stress cracking in polycarbonate, so it should not be used on those parts. A two-part epoxy that lists your plastic type on its data sheet is the safer option for a cosmetic crack.
Is it safe to keep using a laptop with a cracked case?
It depends on where the crack is. A short hairline crack on an outer edge with no flex is usually cosmetic. If the hinge binds, the case separates, the lid will not stay put or the base is bulging, stop using it and have it inspected, especially if you suspect the battery.
Why did my laptop case crack when I opened the lid?
Often the cause is underneath: loose screws, broken mounting posts, too much hinge tension or a damaged hinge. The plastic cracks because the hinge is forcing it. Gluing the crack without fixing the cause usually means it reopens.
How do I know which replacement shell fits my laptop?
Use the full model number, revision and part number from your laptop, then compare them against the maker’s parts list or service manual. Check hinge side, mounting-hole pattern, screw type and screen-size compatibility before you order.
Sources
- MacMyths: How to Fix a Laptop Case
- MacMyths: Repairing Broken Plastic on a Laptop
- Laptopjudge: Repairing Broken Laptop Hinges Or Cases
- 10lappy: How to Repair a Cracked Laptop Case
- RottenWiFi: How to Fix a Laptop Case Without Making Hinge Damage Worse
- CNA Computer Repair: Laptop Hinge Repair Guide
- ComputerRepairLtd: Motherboard Liquid and Physical Damage Repair Guide
- Kmvle: Laptop casing cracks when opening
- ASUS: Customer Induced Damage criteria
- ASUS: UX435EG service overview
- ASUS: X415DA repair manual
- Henkel: UniBond Repair Power Epoxy data sheet
- PlexiSystem: Joining techniques for plastics
- RapidRepair: Broken laptop case screw hole
- Sekin: Repairing broken plastic on a laptop
- LaptopFixing: Laptop Hinge Repair & Replacement Guide