The problem / symptom you mention is almost certainly caused by the power supply shutting down because a fault has developed and judging by what you mention its most likely in the vertical scan circuit, as this area is prone to problems in quite a number of different models which use similar chassis. The repair usually involves going over the IC's solder joints, however if this makes no difference replacing the IC along with an adjacent capacitor is the usual cure. (the capacitor is possibly the well documented C926 and sometimes replacing this alone cures the fault)

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