Sign acting up? Let's figure out which part failed.

Answer a few quick questions and we'll pinpoint the likely faulty component. Works for any sign — we'll show the NovaStar-equivalent part, so just match it to the model inside yours.

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How to open the sign & reach the cards

Where to look: the two boxed modules near the bottom sit in front of the electronics — remove the left module to reach the controller (TB2), and the right module to reach the MRV receiving card.

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Applies to signs purchased after 2020 (X Series modules).

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Likely diagnosis

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How to open the sign & reach the parts

Signs built after 2020 use the tool-free X Series module — remove a module from the face of the sign to reach the electronics behind it:

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Applies to signs purchased after 2020 (X Series modules).

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Important — match your exact part. This tool identifies which component has failed, not the brand in your sign. The part shown is the NovaStar equivalent; the same diagnosis applies whether your sign runs Huidu, DBStar or another controller. Because these parts are not cross-brand interchangeable, always order the version and model number that matches the part already inside your sign — if it differs from what's shown, confirm compatibility with us first.

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This tool suggests the most common cause based on the symptoms you describe. Final part confirmation is always available from our support team.