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Hello, How exactly did you test the outputs of the power supply (we see many people do this wrong)?
Also did you test them AFTER the screen goes black and the power light blinks a steady red?
What you need to do is test after the screen goes black now and find out what voltages are present.
Offhand it would appear that your power supply/inverter has failed and is not able to provide consistent power to the CFFL's in the screen. This can also be caused by failing lamps in the screen itself ,but is most commonly the power supply failing under load. So your backlight voltage- does that flicker or change along with the screen?
Specifically the 24 VDC output from the supply board- is that steady up until the light goes back to red?
Actually seeing you have two inverter boards between the power supply board and your screen. Unplug the two inverter boards, then run that voltage test again. Tell me if the power light stays on.
These guys here- if your power board is shutting down, and your screen flickers a few times before the power light turns red, then these are the boards you would need to replace in most cases. Simply unplug the set from power then disconnect the two inverter boards, see if the set stays powered up (nothing on the screen but steady voltages remain present):
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They should be the same temp- as they do the exact same job (light equal portions of the screen). Did you disconnect them both to see if the power light and voltages stay on??
If the voltages stay present with the inverters disconnected, then your inverters need to be replaced. They're available at that link for just under $40.
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Then you would want to replace your power supply board as it's shutting down and is the root cause of the issue.
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