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In the case of a failed display, in principle this should be replaceable. OLED displays are used on some radios, generally blue and self-luminous against a dark background. Early ones had a limited lifetime. A diligent search, particularly on Far Eastern sites such as Aliexpress and Bangood may lead you to a replacement. Replacements may also be found for LCDs (in appearance, more like most cheap calculator displays). Sometimes just the backlight fails, but you may well have to replace the entire display.