ok, guess i’ll have to just replace and hope it fixs things but as you say, if is is not i just have a spare. Will update once i have sourced and replaced the unit. Thanks for the advice.
They do make a ceramic power resistor to test the lps. I don’t know where you can get one…
As @donkjr advised, you’ve got a new tube, so it’s logical to think it’s the lps…
Good luck
Hello again
New LPS arrived and fitted.Seems to be working fine now if anything its overpowered now 
Still running on the Nano board but will refit the Monport once i run a few tests as Lightburn is easier to handle it all in one place.
Running at 30% and cutting 3mm Clear Acrylic like butter. Hitting 20ma at around 70-75% on the digital control so will have to adjust on the pwm side for Lightburn.
Once again i would like to thank everyone who made suggestions, you are all appreciated immensely. Lets hope this one lasts signifantly longer than the last (Tube and LPS)
I will no doubt be back shortly to seek advice on something or other.
many thanks
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I assume it is solved
Apologies, never crossed mymind to mark as solved 
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