The Intellitec 518 lighting panel is an industrial LED/fluorescent control module that interfaces with multiplexed switch pads and a central power source. Common failure modes for this class of units include blown input fuses or surge‑protected relays, burnt PCB traces from over‑current, and firmware corruption due to power interruptions; the board often shows visible scorch marks on the ICs or capacitor banks. First‑check diagnostics should verify that the panel receives its rated DC supply voltage (typically 24 VDC) with no ripple, inspect the relay contacts for pitting or arcing, and review any diagnostic LEDs or error codes displayed on the module’s front panel. If power and contact integrity are confirmed, perform a visual inspection of the PCB for cracked solder joints or damaged components before proceeding to re‑solder or replace the control IC as needed.[oss-gpt-20b]