For a heater stick with a mechanical relay as you won't need to worry about over heating, SSR's are better suited lighter loads but obviously an SSR could be used...
circuitry will need low voltage/current
and it can be used to switch the SSR ( aka contactor relay)
A contactor relay? Would imply contacts are made via mechanical action from an energized coil, that's not an SSR...
Basically you need to locate the LED driver, test it's voltage, each model will house the led's differently but this is the kind of issue i think you have (edited, wrong vid)
The only possible inverters are in the main psu, it's LED driven
I'd put money on one or several LEDs that failed behind the filter, did you by any chance set the brightness > 90% ?
Adjusting the timing cap would imply you're changing the frequency, i thought pwm applied to a fixed frequency (adjusting the on/off period)
These circuits change the frequency? Is that pwm? More like FM lol
The DM8600 chip, can you take a clear photo of just that chip and it's surrounding components
I've seen a similar issue before, turned out to be a bad chip ..
Power went out....
Ok, sounds like the power supply went bad, no choice but to open it up and check the psu (but if you're unsure don't as there is risk of death from rectified dc in the 100-240v range) ..