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Hello, Troubleshooting relies on specifics, so I need to ask some questions:
1) Where are you purchasing these lamps from and for how much (Ex: Amazon- $30 copies, or $100 OEM lamps)?
2) When the set shuts down, the red light on the front of the set is an "Error Code" generator and blinks a pattern ( 3 blinks, 4 blinks, 5 blinks, 6 blinks, etc.). Please turn on the set set, run it and see if it shuts down. We need to know what the blink pattern of the TV is in order to determine exactly what is wrong here.
Let me know when you're able to see my reply.