What Is the EBR78940619 LG Refrigerator Main Control Board Replacement?

The EBR78940619 is the genuine OEM LG refrigerator main control board for LG refrigerators. This board manages temperature regulation, compressor operation, fan control, and defrost cycle timing. FailSafe Certified™ and backed by a 1-year warranty from Appliance Pro USA.

What Problems Does This Board Fix?

This is the main control board — the module that manages temperature regulation, compressor operation, fan control, and defrost cycle timing. When it fails, your refrigerator loses the function it controls. If your LG refrigerator is showing any of these symptoms, this board is the most likely cause.

• Refrigerator not cooling or cooling inconsistently
• Defrost cycle failures or frost buildup behind the rear panel
• Compressor or fan not cycling on correctly
• Freezer section too warm or too cold
• Unresponsive controls or error codes on the display
• Refrigerator not starting or intermittent power failures

These symptoms point to the main control board as the most likely cause — but refrigerators are complex systems, and the same symptoms can occasionally stem from a thermistor, door switch, wiring harness, or compressor issue. If a technician has identified the control board specifically, or if you've already ruled out other components, this is your part. When in doubt, a quick diagnostic by a local appliance technician before purchasing can save time and money.

How Do I Know If This Is the Right Board for My Refrigerator?

Match the part number on the sticker on your original board to EBR78940619. Your LG refrigerator part number is on a sticker on the board — look for the EBR or CSP prefix. Not sure? Contact us before purchasing and we'll verify for free — same business day.

Genuine OEM — FailSafe Certified™ Reconditioned

Every EBR78940619 board from Appliance Pro USA is a genuine OEM LG board precision-rebuilt through the FailSafe Precision Protocol™ — a proprietary 4-step recertification process built around what we know fails on this board, not just what shows a problem on arrival.

• Failure Pattern Analysis — We've mapped the failure signatures specific to the EBR78940619, identifying exactly which components degrade and fail over time.
• Targeted Component Replacement — We don't wait for components to fail a test. Through failure pattern analysis specific to this board, we know exactly what fails and when — so every board gets those components replaced before it ships.
• Proactive Rebuild Standard — Known high-failure components are replaced with new parts on every board, regardless of whether they show a problem yet. Degraded parts don't ship.
• Final Certification — Board is certified to meet or exceed original LG factory specifications before shipping.

Key Features

• Genuine OEM LG main control board — FailSafe Certified™ Reconditioned
• Rebuilt through the FailSafe Precision Protocol™ — known failure-prone components replaced before they become a problem
• Restores temperature regulation, compressor operation, fan control, and defrost cycle timing
• Minor cosmetic wear may be present due to prior installation — does not affect performance

Board Type and Function

Main Control Board — the central electronic module responsible for every primary function of your refrigerator. Cooling logic, defrost cycle timing, compressor operation, fan control, and sensor input processing all run through this board. When it fails, no individual component is at fault — the system loses its central command.

Common LG Refrigerator Error Codes

If your LG refrigerator is displaying an error code, the table below describes what it typically indicates. Codes marked ★ are most directly associated with main control board failure. Always verify the exact meaning in your model's owner's manual before ordering any part.

Error code definitions vary by LG model series. Always confirm the exact meaning in your refrigerator's owner's manual before purchasing any part.

★ = Most directly associated with main control board failure

How to Install a LG Refrigerator Main Control Board

Most DIY-confident homeowners complete this install in under 30 minutes using basic hand tools. Unplug the refrigerator, remove the rear access panel, disconnect all wire harnesses from the old board, mount the new board into position, reconnect all connectors, replace the panel, and restore power.

Shipping

Every board is physically in stock — no backorders, no drop shipping. Orders placed before 4:00 PM EST ship the same business day. Tracking provided on every order.

Warranty

Backed by a 1-year warranty from Appliance Pro USA. If the board fails due to a defect within the warranty period, we'll repair or replace it at no charge (shipping fees may apply). See our full warranty policy for details. Damage causéd by improper installation, electrical surges, or physical damage is not covered.

Returns

Returns accepted within 30 days of purchase. Items must be returned in original condition. All returns may be subject to deductions for original and return shipping fees. Restocking and retesting fees may apply to opened or installed boards — these fees are waived for exchanges, though reshipping costs and any price difference between products will apply. Boards returned with physical damage, missing components, or signs of improper installation may not be eligible for a full refund.

Important Installation Notes

Most DIY-confident homeowners complete this install in under 30 minutes using basic hand tools. If you're unsure at any point, we recommend consulting a qualified technician.

This is not a universal main control board — it is designed as a direct replacement for the specific part number printed on your original board. Some units may require a firmware update after installation; firmware updates and configuration changes should be performed by a qualified technician. Please note: any board that has been flashed, reprogrammed, or had its firmware altered is not eligible for return.

Last Updated: May 2026