Vision+ 32" HDTV - Main Board Failure After Power Surge (September 2025)

Vision+ 32-inch HDTV came in after a power surge. Customer said it was working fine, then a lightning strike nearby and the TV went dead.

Power surge damage is usually catastrophic. But sometimes you can salvage the TV by replacing the damaged components.

Assessing the Damage

Opened it up. The main board had several blown components. Resistors were charred. A diode was completely destroyed.

But the power supply board looked okay. That's good - power supplies are expensive to replace.

Systematic Diagnosis

Started testing components systematically. Found: - Blown 1N4007 diode in the input protection circuit - Charred 10 ohm resistor - Damaged MOV (metal oxide varistor) that's supposed to protect against surges

The MOV did its job - it sacrificed itself to protect the rest of the board. But it took some other components with it.

The Repair

Replaced the damaged components: - New 1N4007 diode - New 10 ohm resistor - New MOV (metal oxide varistor)

Also replaced the main power supply capacitors as a preventive measure, since they may have been stressed by the surge.

Testing and Verification

Powered it up carefully. All voltage rails came up correctly. TV turned on and worked perfectly.

Let it run for 24 hours to make sure everything was stable.

Why This Matters

Power surge damage doesn't always mean the TV is dead. Often it's just a few components that need replacement.

The key is identifying which components were damaged and replacing them with the correct specifications.

Cost Analysis

Component replacement: $45 Labor: 1.5 hours Total: $95

New Vision+ HDTV: $250+

The customer saved $155+ by repairing instead of replacing.