Hi Eddie,
Turning on and off of the unit is an indication of out-of-regulation condition on the power supply board. It was caused by leaky/dried electrolytic capacitor in that board. It will dropped the normal output voltage and will trigger the symptoms.
Leaky electrolytic capacitor has a physical indication of fault like bulged/dome at the top and can be easily identify. See sample picture of a faulty capacitor with dome at the top.
Dried electrolytic capacitor has no physical indication of fault, you must have a capacitor checker to determine its condition and pinpoint the faulty one.
Another option is to replace the entire power supply board if you can't troubleshoot it yourself. This is more convenient for you because no soldering is required. My supplier hasn't a stock yet of your board, try to obtain it to your local service centers.
Also, check if your unit is still under warranty/extended warranty
period, avail it because the manufacturer will fix it for free. Opening the
back cover will void the warranty.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.