If you succeed, pour a drink. You beat the Chinese supply chain. If you fail, buy an external streaming dongle. Your TV panel is still good. The smart part was always a disposable accessory.
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Unplug the TV from AC power. Press and hold the physical on the TV chassis (not the remote) for 30 seconds. This discharges residual capacitors and resets the protection circuits.
The MSD338 series is produced by CVTE (Guangzhou Shirui Electronics) and is found in various "assembled" or budget smart TV brands. 512MB