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The picture is flashing as a result of the AKB circuit trying to adjust for the correct bias to the CRT; but, it can't because one (or more) of the CRT guns has become too weak. In the early stages, it may be possible to tweak the master G2 control to stop the blinking video; but, the problem will only get worse as the tube further weakens. Other options are to add a CRT brightener (the newer type for flyback powered filaments) or rejuvenate the CRT. The brightener will also only be a temporary fix and Sony CRT's often don't last very long after rejuvenation. They look good at first and then they fall off, and often look worse, after a short time.
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