The letters on signs can burn out due to a variety of reasons such as weather conditions, age of the sign, and the type of light bulb used. For example, if a sign is exposed to direct sunlight for long periods of time, it can cause the plastic or acrylic letters to become brittle and crack. Additionally, if a sign is exposed to harsh weather conditions such as rain or snow, it can cause water damage and electrical shorts. Finally, if a sign has been up for a long time, it may simply be due for a replacement.
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