I just had a power supply die on one of my HD boxes. It was a supply that had required a cap change 2 years ago and it worked well until this week. The big transformer T100 was producing a "ticking sound" and based on the fact that it sounded like a consistently timed electrical discharge "snap" in the Hi Pot transformer. I just swapped the supply out with another I had on hand because the transformer would be hard to find and time is money. Regards Rob