Always ensure the TV is unplugged before inspecting external ports or cables.
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Check if the secondary rails (12V, 24V) stabilize. If they drop or fluctuate wildly, the feedback optocouplers or TL431 voltage shunt regulators are likely defective. 4. Mainboard and Smart OS Troubleshooting Always ensure the TV is unplugged before inspecting
Initial checks & symptom logging
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