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Repair parts for channel letters and lightboxes
When a channel letter sign fails, it is usually one part, not the whole sign. A run of LED modules dies, a face cracks or fades, or a power supply gives out. Replacing that part costs far less than a new sign. Sign shops call the light parts LED sign modules or injection modules.
Start by finding the problem:
- One letter dark, the rest lit: usually LED modules or a connection inside that letter.
- The whole sign dark: check the circuit, any photocell or timer, and then the power supply.
- Flickering: often a loose connection or a power supply that is overloaded or failing.
The guide to troubleshooting channel letters goes step by step.
The parts:
- LED modules for channel letters: 12 V, three LEDs per module, IP65, adhesive back, in white 6500 K, warm white 3000 K or red. Match the color already in the sign. How to replace LED modules shows the job.
- A replacement acrylic face, cut to the shape of your letter from a rubbing or pattern of the old one, in white or colored acrylic, with a new trim cap. Flame-retardant polycarbonate is available when a fire marshal asks for it.
If the power supply is the culprit, our 12 V outdoor supplies replace most channel letter supplies. Installation is not included. For letters high on a building, a local sign company with a lift is the safer choice; our repair project shows what a typical fix involves.
- Switch off the power before you open a letter.
- Match the color temperature of the modules already in the sign, or replace every module in that letter.
- Before adding modules, check the power supply still has about 20 percent headroom.
- For a new face, make a careful paper pattern and mark which side faces out.
- Feed a long letter with several short runs of modules, each wired back to the supply, instead of one long chain.
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12V LED Modules for Channel Letters, 3-LED, IP65 Waterproof
12 V DC 3-LED injection modules for channel letter and lightbox repair: IP65, adhesive back, white 6500 K, warm 3000 K or red, in packs of 20 or 100.
From $14.99 · 5 options
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Replacement Acrylic Face for a Channel Letter, Cut to Shape
New translucent acrylic face cut to the shape of your channel letter, to replace a cracked or faded face; white or colored, with a new trim cap.
Price on request
Questions
One letter of my sign is dark. What is wrong?
Usually the LED modules or a connection inside that letter, since the rest of the sign has power. Open the face with the power off and look for a broken wire or a dark run of modules.
12V LED Modules for Channel LettersCan I repair a sign made by another company?
Usually, yes. Our LED modules run on 12 V and fit most channel letters, and replacement faces are cut from a pattern of your old face. Send photos if you are not sure.
Replacement Acrylic Face for a Channel Letter
Front-Lit Channel LettersWhich LED color should I buy?
The same color temperature as the modules already in the sign: crisp white is usually 6500 K and warm, yellowish white is 3000 K.
Do you install repair parts?
No. We supply the parts. A handy person can swap modules or a face on a sign they can reach safely; for high signs, use a sign company with a lift.
Can a replacement face be flame-retardant?
Yes. Standard acrylic is not flame-retardant, so when a fire marshal asks, the face is cut from flame-retardant polycarbonate.
Can I cut a chain of LED modules?
Yes. Cut the wire between two modules, never through a module, then cap or seal the open ends and connect each run positive to positive and negative to negative.
Should I repair the sign or replace it?
If a few parts have failed and the letters themselves are sound, repair usually makes sense. When failures keep spreading across many letters, or the letters are corroded or damaged, a new sign may be the better buy.