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Thank You for the question! This set uses a "LIFI Lamp." Part info below and it is probably the problem. This is NOT a lamp that a consumer can change. One piece of advice for you: Pack a lunch when you go to change the lamp yourself. You need to remove the entire light engine and carefully remove all of the metal shielding around the lamp. Don't disassemble until you get the new lamp first. Unless you have a photographic memory, you don't want to tear this down and try to reassemble several days later. When you do get the old lamp out, put the old one and the new one side by side and make sure you transfer all of the shields before you reinstall it. Part number should be: LFS4000PA1 Do a Google search with this part number and be sure it matches the compatible model number.