LG Main Control Board Intermittent Failure

Freezer intermittently stops cooling; sometimes works after unplugging and plugging back in.

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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

Cold solder joints on main PCB, Overheating PCB components, Intermittent relay contacts, Voltage spikes damaging control circuitry

How to Fix / Troubleshooting

Safety: Unplug the freezer before removing the rear access panel or touching the control board.

  • Observe behavior: Note if lights and display stay on when cooling stops. If so, the control may not be energizing the compressor or fans.
  • Access main PCB: Remove the rear panel to expose the control board enclosure. Open the cover.
  • Visual inspection: Look for burnt spots, bulging capacitors, or discolored areas on the PCB.
  • Connector check: Reseat all connectors to ensure good contact.

If symptoms improve temporarily after power cycling but recur, the main control board is likely failing internally and should be replaced with an LG-compatible board by a qualified technician.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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