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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience. If blinks continue without any pause, the main board is faulty.
The rolling is a bad filter capacitor on the signal board in the set---Any Mitsubishi dealer can look the model up and see known faults including this one---some of the sets when cold---vertical jitter in picture or just menu---If the menu is stable you have a tiny bad cap= weak caps when cold act up and when get hot regain capacitance and start to work.
Ur tv have problems,etheir the Tuner signal board or the LCD inverter board.After u turn on the tv,no picture turn tv off/on 3-4 times each time wait a few mins.see if the picture come on?Than it ur Tuner board have problems.If u turn on the tv and get just a flashes of a picture about 30 or 40 sec.than just disappear,than ur LCD inverter board is the problems it dead.
i had prob where my sony would switch off for a few secs thenh come back on . The solution was in menu / tv settings / sleep timer . Go into that and make sure its set to off. there are opions for off , 5 min 20 min 30 min etc... mine was set to nothing just blank.
I doubt from your desciption of the problem that dust is causing the problem. It sounds more like an issue with the digital board which takes care of decoding the data stream. This problem is probably beyond your capabilities but any good repairman should be able to repair it quite easily and at a reasonable cost. Good luck.