Have you ever replaced the lamp. A defective lamp can cause a clicking or buzzing sound. If you haven't replaced the lamp you should try that first. If it's not the lamp you can keep the new one as a spare. The ballast is a really common problem with DLPs so you should be able to find it online at a decent price. The part number for the ballast you need is 938P060010. Also, you can enter the error code menu by pressing the front panel 'INPUT' and 'MENU' buttons at the same time for five seconds. Make sure the TV is off before you do this. There error codes are really easy to read. Example: If the error code is 23, the LED will flash two times, pause and then flash three times. The error code will be repeated 5 times. Here are the error codes.
12 - No error found
32 - Lamp cover is open
34 - Lamp turns off while TV is playing. (Lamp failure) or (Lamp enable signal from engine is lost)
36 - Lamp ballast fan has failed
37 - Engine (DLP) fan failed
38 - Lamp temperature is abnormally high
39 - DMD temperature is abnormally high
42 - Exhuast fan failed
44 - Check for disconnected DVI cable between PWD-DM and Engine
48 - Engine power supply short is detected
57 - Ballast communication problem (ballast to chassis).
58 - Signal short is detected
59 - DM short is detected
61 - No LAMP-EN output from the engine to the ballast
66 - Lamp did not turn on at power on sequence (No lamp inserted), (Disconnected cable between ballast and lamp), (Lamp-enable goes to DM but not to ballast
I hope this helps.