LG Power Supply or Main PCB Failure

Freezer will not start at all; no lights, no display, completely dead.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Tripped circuit breaker or blown fuse, Faulty power cord, Open thermal fuse on PCB, Failed main control board power supply section

How to Fix / Troubleshooting

Safety: Before working on electrical components, ensure the circuit is de-energized at the breaker panel.

  • Check outlet: Test the wall outlet with another device. Reset any tripped GFCI or breaker.
  • Inspect power cord: Look for cuts, burns, or kinks. Replace if damaged.
  • Access main PCB: Remove the rear panel and open the control board cover.
  • Visual inspection: Look for blown fuses on the PCB (if present), burnt components, or discoloration.

If the outlet and cord are good but the unit remains dead, the main control board is likely faulty and should be replaced by a qualified technician.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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