If your Samsung TV is experiencing issues like random restarts, no power, or failure to boot up, the main PCB assembly (BN94-10663A) might be the culprit. This genuine Samsung part is crucial for the functionality of your 40-inch class H5003 5-series LED TV, or your 32-inch HD (720P) LED TV. It is the heart of your television's electronic system and a direct replacement for the main board of your TV. Before purchasing, verify your device's model number for compatibility.