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TV needs new lamp as symptom shows existing lamp is weak and causing repeatedly on-off Please replace lamp in TV, replacement procedure is written in user manual and it is not difficult. Always buy Sony original lamp for TV safety. Let me know if you need further help. Thanks.
Check the "Sleep Timer" settings. If set to 45 minutes then TV would automatically turn itself off 45 minutes from being turned on. The variance in the "on" times is due to the TV turning itself off after not getting a signal from the remote for fifteen minutes.
It is possible that the ballust assembly is causing the lamp to fail. You likely need to replaced the ballust with a new lamp because if the ballust is bad it has likely already damaged the lamp. If you have been handling the glass of the new lamps with your bare hands this could be the cause of the short lif as the oil from your hands will cause premature failure of the lamp.
I also have a Sony KDF-42WE655 42" Lcd television. We just changed the lamp (bulb) several weeks ago and has noticed that everytime we turn on the television it stays on about 30-40 seconds then cuts off. After about 15-20 seconds it cuts itself back on. Weird!! It must have something to do with changing the bulb!?!?
I would suggest that you guys turn the unit off when this happens, unplug the unit for 30 seconds, plug it back in, and see if this helps. If this does not solve your problem, you should call 1-800-448-2244, so a service center in your local area can be found for further assistance.