In the olden days we used to use hair driers and cans of "freezer spray" - ozone-depleting freon in a can, now replaced with more eco-friendly stuff - to heat and cool components to see which ones were temperature-sensitive. Quite often you'd get a fault that would only show up when the set was cold, or only after it was thoroughly warm.
I'm wondering if perhaps C206/C207/C208 in the LDO circuit that decouple the output might have gone a bit leaky and warming them up causes them to act more like capacitors and less like resistors to ground. If they're SMD multilayer ceramics that would be a pretty common failure.
I'm wondering if perhaps C206/C207/C208 in the LDO circuit that decouple the output might have gone a bit leaky and warming them up causes them to act more like capacitors and less like resistors to ground. If they're SMD multilayer ceramics that would be a pretty common failure.