This may happen at any time or possibly after being on for awhile in which
something heats up and drifts out of spec.
|NotTaR of Television Sets : TV shuts down with dark picture or when ..
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The low voltage regulator may be letting the voltage rise excessively. Then,
a dark picture or video muting during a channel change triggers the X-ray
or power supply overvoltage protection.
Monitor the output of the low voltage power supply B+ to see if it is stable
as the brightness/scene changes.