A used LC-32LE280X mainboard (part number or QPWBG959SJN2 ) costs $25-40 on eBay. Swapping it takes 15 minutes and 10 screws. No firmware flashing required.
If the update fails or the TV still does not turn on, consider the following steps:
If your TV ignores all USB drives, you can attempt a (advanced users only):
Select to check for and install any available firmware automatically. Troubleshooting Tips
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