I do have a volt meter, but need to be sure to identify the power supply board. Do I follow the lead from the 240v socket, and presumably need to have the power lead connected. I have provisionally replaced the whole back panel and will have to remove this again which I am not able to do at this moment, but can try later.
I will try to do this later, otherwise will try tomorrow late afternoon.
It is hard to be objective in the ratings until we are closer to a solution to the problem. However I have again removed the back panel and tested the voltage 'out' from the main (large) board. I eventually found the connectors with the voltage out markings. 5.2v 12v and 24v.
the 5.2v out lead showed the correct voltage and this lead with many other leads went to the smaller board which has all the input sockets.
I have repeatedly tried connecting the power lead and the red/white indicator light continues to alternate every few seconds. A red led glows briefly under the optic signal socket at the same time as the main led indicator is red.
A website stated that if a 3.5mm headphone jack plug was repeatedly inserted it would clear the problem, which I tried to no avail.
Where do we go from here?
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Thanks for your patience,