Hi, my friend has the same model TV which had the same exact issue.
We checked the power supply voltages, all fine. Then we measued all 3 voltage regulators on the main board (IC2700, IC8800, IC8901), which were fine as well.
So finally we decided there's nothing to lose and stuck the main board into a home oven preheated to 240°C for 3mins. Much to our surprise, the TV works now

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