If the main fuse is intact but no standby voltage exists, the low-power standby IC might be defective. ⚡ Unstable or Pulsing Voltages
If the standby light flickers or voltages cycle up and down, continuous oscillation is failing.
Provide the voltages you measured at the secondary connector pins.
Inspect the optocouplers and TL431 shunt regulator responsible for voltage feedback. 💡 Sound but No Picture
Cleans incoming AC mains voltage and converts it to high-voltage DC.
Boosts and regulates the DC rail to roughly 400V.
If the main fuse is intact but no standby voltage exists, the low-power standby IC might be defective. ⚡ Unstable or Pulsing Voltages
If the standby light flickers or voltages cycle up and down, continuous oscillation is failing.
Provide the voltages you measured at the secondary connector pins.
Inspect the optocouplers and TL431 shunt regulator responsible for voltage feedback. 💡 Sound but No Picture
Cleans incoming AC mains voltage and converts it to high-voltage DC.
Boosts and regulates the DC rail to roughly 400V.
