Hi Adrian,

Have you ever replaced the capacitors on the PSU board next to the PSU?

You may find that the capacitors are causing more current draw on the PSU, causing it to fail.

If they've not been replaced, I would strongly advise replacing them, otherwise, the new PSU won't last long!
From memory, there are five capacitors.

If you need any assistance with this, please drop me a PM.

Cheers,

Steve

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5k.2C, DSP33, F80
Spare: MCD, 100 Series, 200 Series, 500 Series, C15s.