Prečo moje LED pásové svetlá nefungujú potom, čo som ich odrezal?


Why Do LED Strip Lights Stop Working After Cutting?

A Practical Guide by Lightstec (Professional LED Strip Manufacturer)

Cutting LED pásy svetla is a common practice for custom installations, but improper techniques can lead to malfunctions. As a leading LED strip factory, we’ll explain the technical causes and provide actionable solutions for your clients.

rezané SMD5630 LED PÁS SVET

Sprievodca článkom

    Key Reasons & Fixes

    1. ​Incorrect Cutting Points

    LED strips have ​scissors icons every 3–6 LEDs indicating safe cutting positions. Cutting elsewhere severs internal circuits, causing partial or total failure.

    • ✅ ​Fix:
      • Use sharp scissors or a blade at marked points.
      • For accidental cuts, test continuity with a multimeter and solder broken connections.

    3, strihané pruhové svetlo

    2. ​Circuit Damage or Burned LEDs

    Cutting exposes copper pads, which can oxidize or short-circuit. Overloading remaining LEDs after trimming may also burn chips (visible as black spots).

    • ✅ ​Fix:
      • Insulate cut ends with ​liquid electrical tape or heat-shrink tubing.
      • Replace burned LEDs by soldering matching 3V chips or bypass them with wire.

    LT-2835WW60R-W12

    SMD 2835 SVETLO LED PÁSU 60LED/M , DC12/24V ,12W/M

    LT-2835WW60R-W12-S

    SMD 2835 SVETLO LED PÁSU „S“ 60LED/M, DC12,12W/M

    LT-2835WW120R-W24

    SMD2835 SVETLO LED PÁSU 120LED/M, DC 24V, 24W/M

    LT-2835WW180R-CC

    SMD2835 SVETLO LED PÁSU 180LED/M , KONŠTANTNÝ PRÚD

    LT-2835WW192R-W12

    SMD2835 SVETLO LED PÁSU 192LED/M, DC12,24W/M

    LT-2835WW192R-W24

    SMD2835 SVETLO LED PÁSU 192LED/M, DC24V, 24W/M

    3. ​Power Supply Mismatch

    Shortening strips changes voltage requirements. For example:

    • A 12V/5m strip with 60 LEDs = 2.4V per LED.
    • Cutting to 3m (36 LEDs) = 12V/36 LEDs = 3.3V per LED (overloading chips)
    • ✅ ​Fix:
      • Recalculate power needs:
        Required Voltage = (Number of LEDs) × 3V  
      • Replace the driver with a ​constant-current model matching the new load.

    4. ​Reverse Polarity or Driver Failure

    Reconnecting cut strips with reversed +/- wires can instantly damage LEDs. Faulty drivers (e.g., capacitor failure) may also cause flickering or no power.

    • ✅ ​Fix:
      • Verify polarity using a multimeter before reconnecting.
      • Test driver output voltage. Replace if dead or unstable.
        Ako pripojiť LED pás s LED ovládačom

    5. ​Poor Soldering or Connectors

    Loose solder joints or low-quality connectors create resistance, leading to dimming or intermittent faults.

    • ✅ ​Fix:
      • Use ​60/40 rosin-core solder at 300°C for secure joints.
      • Opt for waterproof 4-pin connectors for RGB strips.

    Preventive Tips from Lightstec

    1. Always test strips with a 3V battery before installation.
    2. Add ​aluminum channels for heat dissipation if shortening >50%.
    3. Use drivers with ​20% higher capacity than calculated needs.
    4. Avoid cutting ​high-voltage (120V/220V) strips—replace damaged sections instead.

    FAQ

    Q: Can I reconnect cut strips without soldering?
    A: Yes! Use solderless 4-pin connectors (ideal for RGB), but ensure copper pads are clean.

    Q: Why do some LEDs stay dim after cutting?
    A: Likely due to voltage drop. Install a ​24V strip or add power injection points.

    Q: How to waterproof cut ends?
    A: Seal with silicone gel connectors or epoxy resin.

    When to Replace vs. Repair

    • ✅ ​Repairable: Minor burns, clean cuts at marked points, functional driver.
    • ❌ ​Replace: Corroded pads, burnt circuit traces, or water damage.

    Lightstec’s Professional Support

    As a factory-direct supplier, we provide:

    • Free ​cutting guides and voltage calculators.
    • Custom drivers and connectors for bulk orders.
    • 24/7 technical support via [[email protected]].

    Need OEM/ODM solutions? [Contact Lightstec] for durable, cut-to-size LED strips with 5-year warranties.

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      Manager Director-Jerry

      O autorovi
      JerryHu
      Zakladateľ spoločnosti Lightstec.Engineering. Viac ako 13 rokov pracovných skúseností v podnikaní s LED osvetlením. Oboznámený s výrobou produktov LED osvetlenia. Tento blog sa s vami podelí o znalosti a riešenia v oblasti LED osvetlenia. Vitajte pri získavaní LED svetiel z Číny.

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