Verify your (usually 12V for this model) before powering on with new firmware to avoid damaging the T-Con board.
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LED TV. My unit is currently stuck on the standby light/logo, and I suspect a corrupted firmware. TV Model: Cristor 40LH420 Mainboard: TP.MS3663S.PB801 (MS3663 PB801) Verify your (usually 12V for this model) before