Mirtone 25280225‑2 is the LED display board for a Mirtone 7600 fire alarm control panel, providing status indicators and fault annunciation to the main enclosure. Common failures on this board include burnt or cracked LEDs, loose solder joints on the driver ICs, and degradation of the power‑regulation circuitry under high humidity or voltage spikes; intermittent display flicker often points to a failing DC/DC converter or capacitive decay. Begin troubleshooting by verifying that the panel’s 24 V supply is within spec and that all connectors are secure, then inspect the board for visible burn marks or cracked components, and finally check the output of the LED driver ICs with an oscilloscope for correct voltage levels and ripple.[oss-gpt-20b]