Original post:
https://www.reddit.com/r/ElectronicsRepair/s/2DlyTv6kMr
It’s been a while, but I wanted to close the loop on this for anyone searching in the future. I ended up sourcing a replacement board from a smaller model with a cracked screen to get the TV running, but I finally got this original board back under the microscope to confirm the exact failure.
Final findings: The Component: The 6-pin IC labeled 4208 (IC2200) is a TPS564208 buck converter. The Fault: The inductor L2200 was dead shorted to ground.
Isolation Test: I removed L2200 to isolate the regulator from the load. The regulator side (IC2200) tested fine (~226kΩ to ground). The system side (SoC side) remained shorted to ground at nearly 0Ω.
Thermal Confirmation: Even without a bench power supply for injection, connecting the board to the TV's own power caused the main processor (IC101) to hit 50°C almost immediately in standby.
Conclusion: The main SoC has an internal short on its core voltage rail. This is a beyond economical repair situation for most, as it requires a donor SoC. If you find a short on L2200 on these boards, save yourself the time and just look for a replacement mainboard (EAX69049007).
Thanks to everyone who weighed in on the original post!