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If PS-ON never changes voltage, the main board is likely faulty, or the physical button panel is shorted. On many power supplies, unplugging the main board will force the power supply and backlights to turn on automatically, proving the PSU is functional.

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Failed capacitors are a leading cause of power supply degradation. Look closely at the tops of the metallic canisters. A healthy capacitor has a completely flat top. If the top is domed, bulging, or showing brown crusty residue, it has dried out or ruptured and must be replaced. For definitive testing, desolder the component and measure it with an ESR (Equivalent Series Resistance) meter. Testing Surface-Mount Fuses If PS-ON never changes voltage, the main board

Visually locate the largest capacitor on the power supply board. Use a dedicated capacitor discharge tool or a high-wattage resistor to safely drain remaining voltage before touching the board traces. replace the TV Failed capacitors are a leading