Vizio E420-A0 E420D-A0 E420I-A0 Power Supply Board 0500-0614-0300, PSLF131401M

Summary of power board faults:
✅ TV does not turn on at all → Swollen capacitors, short circuit, blown fuse.
✅ Standby LED flashing or off → Voltage regulation fault, main power supply failure.
✅ No backlight → Backlight power supply failure, broken transformer or LED driver; check LED strips as well.
✅ TV turns off after a few seconds → Short circuit or overheating protection, unstable voltage issue.

❌ TV turns on but immediately shuts down → Can also be caused by the mainboard or a short circuit in the panel.

Summary of mainboard faults:
✅ TV on but black screen (backlight active) → Firmware issue, corrupted EEPROM, or dead GPU.
✅ TV does not respond to buttons or remote → Mainboard frozen, NAND memory issue.

✅ TV responds to remote but screen stays black and sound plays; no image even when using a flashlight → Broken image circuit on the mainboard.

✅ Frozen image or visual artifacts → Damaged video processor, faulty RAM.
✅ No sound but image OK → Broken audio circuit, shorted amplifier or headphone output.

❌ No image or backlight → Can also stem from the power supply or LED backlight; often visible with a flashlight in a dark room.

Summary of LED strip faults:
✅ No backlight but image visible with a flashlight → Burnt-out LEDs or faulty LED power supply.
✅ Flickering or partial backlight → One or more broken LEDs, LED driver issue.
✅ Dark spots or darker areas on the screen → Some LEDs are weak or defective. ✅ TV turns off after a few seconds → Power supply protection triggered by too many burnt-out LEDs.

❌ Completely black screen (even when checked with a flashlight) → Could be caused by the T-CON board or the mainboard.

Summary of T-CON related issues:
✅ Vertical lines → T-CON issue, LVDS connector problem, or faulty gamma circuit.
✅ Only half the screen displays → T-CON issue or poorly connected LVDS cable.
✅ No image but backlight is working → Faulty T-CON or blown fuse.
✅ Distorted colors → Faulty gamma IC on the T-CON board.

❌ Horizontal lines → Often an LCD panel issue, poor COF layer connection, or an irreparable internal fault.

-Did the purchased item fail to fix your TV problem? No problem; you can contact us to return the item for a refund (return shipping costs are the customer's responsibility).