Try disconnecting the LVDS cable from T_CON and turning on the TV, when the backlight turns on without turning off the TV, insert the cable carefully back quickly and without distortions, an image should appear, reset and update via usb. Do you have firmware PKG4.027EUA?
To Lotas, if the tv shows an error code i think is in standby protected mode, it can't turn back to On mode.. To Dino: alternating green-yellow is typical of Sony when detected an hardware pairing change between mb<>tcon, you need to find the key conbination to force update, since tv is already updated it normally refuses updating... have you read the service manual?
Yes I saw the service manual and I read that you can't update if it has the latest firmware but I I didn't find anything about force update.. Do you know the key combination for the force update?
When it enters recovery mode, it doesn't matter to it what firmware you installed on usb, as long as it is not lower than the one that is currently installed. How do you prepare usb flash for upgrade?
I understand from your topic that you replaced the T-con board, I hope the old T-Con board remained (what happened with the old board and which one you changed to (diagonal, model ..). Write in detail your actions.
Then this option, which I wanted to offer, will not help (I thought it was T-con), then only an update via usb.
And can you buy a native T-con, where did you get the motherboard? Or he had a different diagonal.
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