This sounds like a GPU issue which is well known on this model. To test, hook up an external monitor.
Apple did do recall for these models but it has now expired:
The problems have been documented over the past couple of years on Apple’s own Support Forums.
Additionally, the iMacs must fall in the following serial number configurations:
The last four characters of the serial number must contain one of the following groups (for example, xxxxxxxxDHJQ):
DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8
DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610
Here's more info on it: https://9to5mac.com/2013/08/16/apple-ope...
A hot air station reflow of the GPU card has been effective as a fix.
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Although it is very probably that the videocard is the person in charge of the blackout, really I would like to discard any flaw in the Power Supply and the Backlight Board.
For it it would be useful to measure the voltages
da ned flanders