The Lunar Corp 6827B Detector is a sensor module used in GE Lunar Prodigy bone densitometers to capture X‑ray attenuation data during DXA scans. Common failure points for this class of detector assemblies include degraded scintillator crystals, broken photodiode arrays, and failing front‑end ASICs that can produce high noise or zero‑output signals; power supply decoupling failures often manifest as intermittent readouts. First‑check diagnostics: verify the 12 V/5 V rail voltages at the detector board, inspect for visible damage to the scintillator or photodiode contacts, and review the system error log for “detector failure” codes before proceeding with component replacement.[oss-gpt-20b]