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The most common cause of this is bad or failing capacitors on the power board or another major board. The power board is the most common for this symptom. The first thing I would do is a visual inspection of the power supply and.look for buldging or leaking capacitors, even if only slightly. If you find any, replace them. In fact, while you are there you can replace them all. There will only be a handful on the power board. Just use caps that have the same.capacitance rating or slightly higher. Let me know what you find out there and we can proceed.
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It's tough for me to tell from that distance and angle, because it can sometimes be very slight.
I'll take your word for it. But I would also check the other boards if you haven't. Beyond that, if you are familiar with using a multimeter and have one, we can check some voltages.
Have you already checked the capacitors on all boards?
The next thing to do would be to measure the VS and VA voltages from the power supply. Ideally you can do this when it is working and when it stops working. If you find that the power is drawing down to 0, you can disconnect a single board and do the same test. if you have a board disconnected and it stops the voltage from dropping, then you have your culprit.
OK. Let me know how you make out.