Icon PB-121 Power Supply Board

The Icon PB‑121 is a power supply board used in Icon Pro‑Form and NordicTrack treadmills; it supplies the main 120 V/240 V DC rails to the controller and drives the incline motor. Common failure modes include burnt electrolytic capacitors, damaged voltage regulator ICs, shorted tracks on the PCB, and blown fuses or protection diodes. First‑check diagnostics: verify that the AC input is present and within spec, measure the output voltage rails for correct levels, then visually inspect the board for burn marks, cracked solder joints, or missing components before proceeding to component‑level testing.[oss-gpt-20b]

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