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When Connecting T-con Board Tv turns off and becomes unresponsive

When Connecting T-con Board Tv turns off and becomes unresponsive

"Update: annoyingly now connecting the tcon board doesn’t do anything, and it remains backlight on no picture
Update2: when adding the ribbon cable sometimes it flashes what should be there or a white screen with black lines before it turns off.

KD-55XE7093 Sony Bravia TV Sound and the backlight works but no picture, adding t-con board prevents the TV from starting up (white LED indicates startup then after 1/2 seconds it turns off) connecting the Tcon-board after startup turns the TV off.

When the TV is turned off and unplugged, I then hold power then it resets allowing me to try turning it on again.

Removing the power to the LED panel doesn’t change anything.

I have 4 T-con board, 2 mainboards and 2 power boards (+cables) and tried all combinations.

My previous question contains more details: Sony Bravia KD-55xe7093 Backlight Working, Sound Working, No Picture"

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