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Your convergence amplifiers are begining to malfunction. This is not expensive However I would advise that you get a qualified TV technician to work on the set due to a chance of damaging you TV if you install the amplifiers incorrectly.
the problem may be due to dry soldering in the power supply stage if it was with the lamp there would be red or green light showing the presence of the power to the tv after making it own some of the components get hot and it will make the the soldering point conectionless and after some time the heat sink get cooled and the soldering point gets connected and u will see the picture again it is a simple problem if u have a soldering iron u make it hot and re solder all the components in the first part of the circuit board and the problem if rectified
If you have the owners manual look on page 64 and see what it says there about the light lighting up in the front of the unit. if you do not have the owners manual, you can get one for free here: