blinking red standby light and backlights.

Samsung 55 4k, replaced both ps and main boards. Still have original problem: blinking red standby light and backlights. With main board disconnected, backlights stay on, just as with original boards. What else is there to replace? Cables/pins went bad hanging on the wall during use? That whole panel on the bottom? I know, I should cut my losses?

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Edward Marian what exact model is this? Your bascklight are blinking on and off but when you separate the mainboard from the power board they stay on. Is that correct? You replaced the main board and the Power board with some new boards? Is that correct?

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