EBR84433504 LG Refrigerator Main Control Board: LMXS30796 Fitment, the EBR78643431 Number You Will Find, and the 30776 Mix-Up
The EBR84433504 is the LG refrigerator main control board supplied for the LMXS30796S and LMXS30796D, the 29.7 cubic foot InstaView Door-in-Door four door French door refrigerators. Two things set this board apart from most main board purchases. Its documented fitment is unusually narrow, just those two model codes, while its number sits in a family whose neighbours serve models that differ by a single digit. And the board fitted to your refrigerator at the factory almost certainly does not read EBR84433504 at all. This guide covers what a genuine board fault looks like here, what has to be ruled out first on a linear compressor platform, how the numbering works, and how to confirm fit before you spend anything.
What Does a Failing EBR84433504 Look Like on an LMXS30796?
Commonly reported symptoms associated with an EBR84433504 main control board fault on the LG LMXS30796 include the fresh food or freezer section drifting warm while the other holds, frost packing the rear freezer panel because defrost never completes, evaporator or condenser fans that will not start or will not stop, a repeating fault code on the dispenser display, and a panel that lights and beeps while nothing in the cabinet responds.
This board sits between every temperature sensor and every cooling load in the cabinet, so a fault rarely presents as one clean failure. What owners and technicians describe on this platform is usually a refrigerator that is partly working, which is exactly the picture that makes people replace the wrong part. Work down the list, then read the rule out section, because the most expensive misdiagnosis on this cabinet is not a sensor.
- One compartment drifts warm over a day or two while the other holds its setpoint normally
- Frost packs the rear freezer panel until airflow drops away, pointing at a defrost cycle that never completes
- The evaporator or condenser fan does not start on a call for cooling, or runs and never cycles off
- A fault code appears on the dispenser display, clears when power is cycled, and returns within hours
- The control panel lights, beeps and accepts input while nothing in the cabinet changes in response
- The CustomChill drawer will not hold the temperature its own control is set to
- The refrigerator loses cooling entirely while the display, the interior lighting and the InstaView panel all stay live
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Why Does the Board You Pull Out of an LMXS30796 Usually Read EBR78643431?
Because EBR84433504 is the later supply number for the board originally fitted to the LMXS30796 as EBR78643431. Parts records list EBR78643431 as replaced by EBR84433504, so a board reading EBR78643431 is the correct board to replace with an EBR84433504. Read the applied label on your board, not the model number, before ordering.
This short video shows how to find and read the label on an appliance control board and how to confirm a part before any packaging is opened. On this refrigerator there is one extra thing to understand while you are looking at that label. The number you find will very often be EBR78643431 rather than EBR84433504, and that is the expected result rather than a sign you are looking at the wrong board. EBR84433504 is the number the same board is supplied under now. What you must not do is skip the label and order from the model number alone, for reasons the compatibility section below sets out.
Is It the Board, the Linear Compressor, or Something Cheaper?
On an LG LMXS30796 the first question is not which board to buy, it is whether the cooling loss is electronic at all. This cabinet uses a linear compressor, and a refrigerator that runs continuously without producing cold is describing the sealed system rather than the control board. A board fault here shows up as control that has stopped responding, not as cooling that has quietly weakened.
Read the table below as a sorting exercise. The most useful distinction on this cabinet is between a refrigerator that has stopped being told to cool and a refrigerator that is being told to cool and cannot. The first is a control problem. The second is a sealed system problem, and it is the one most often misdiagnosed as a board on this generation.
| Symptom | What It May Indicate | Recommended Next Step | Board? |
|---|---|---|---|
| Runs constantly, cabinet slowly warms, compressor is warm and running | The sealed system rather than the control side, since the board is clearly commanding a cooling call | Have the sealed system evaluated by a qualified technician before any board is ordered. Check what warranty coverage still applies to the compressor first. | Usually not the board |
| Compressor never attempts to start, fans silent, display normal | The compressor drive circuit, the compressor itself or the board's cooling output | Confirm whether the compressor is receiving a start command at all before treating this as a board fault. | Possible |
| Rear freezer panel packing with frost | A defrost cycle that is not completing, covering the heater, its sensor, a thermal fuse or the board's defrost timing | Run a forced defrost per your model's instructions and confirm whether the heater actually draws current. | Check defrost parts |
| Fan fault reported while the fan spins freely by hand | The fan feedback loop, which includes the motor, its harness and the board input reading it | Confirm supply at the motor and continuity in the feedback wiring before ordering a board. | Check fan first |
| Display dead, cabinet still cooling correctly | The separate display board or its harness rather than the main PCB | This cabinet has more than one board. Check the display assembly and its connection first. | Usually elsewhere |
| Sensor fault returns after a correctly measuring new sensor is fitted | The sensor input circuit on the main board | Measure the replacement sensor at the board connector rather than at the sensor body, then treat the board as the remaining candidate. | Points at board |
| CustomChill drawer alone will not hold its setpoint | The drawer sensor or its heater and damper hardware before the board | Check the drawer's own sensor and airflow path before assuming the control side has failed. | Check drawer parts |
Which Display Codes on This LG Platform Actually Point at the Main PCB?
Fault codes on this LG platform are generated by the main control board and pushed to the dispenser display. Most of them name a sensor, a fan or a heater circuit, and the named part is what gets tested first. Codes describing communication between boards, and faults that persist after the named part measures correctly, are the ones that lead back to the main PCB.
The table below is a starting point for reading what the display is reporting, not a diagnosis. Code sets on LG refrigerators are not uniform across model years or board revisions, and this generation also supports an audible diagnostic routine played through the control panel to a support line, which is a separate procedure. Procedures vary by model, so confirm the meaning and the entry sequence in the service information for your own model before ordering anything.
| What the Display Reports | What It May Indicate | Is It This Board? |
|---|---|---|
| Communication code between boards (commonly rendered Er CO) | The link between the main control board and the display board. That link has two ends and a harness in between, so this code covers both boards and the wiring | Board or display |
| Freezer sensor circuit (commonly rendered Er FS) | The freezer temperature sensor, its wiring, and the board input that reads it. The sensor is the cheap end of that list | Check sensor |
| Refrigerator sensor circuit (commonly rendered Er rS) | The fresh food temperature sensor circuit on the upper cabinet | Check sensor |
| Defrost sensor circuit (commonly rendered Er dS) | A short or an open in the defrost sensor or its wiring, read at the board | Check sensor |
| Defrost heater circuit (commonly rendered Er dH) | The defrost heater, a thermal fuse or the wiring between them. The board becomes a candidate only after those test good | Check heater first |
| Freezer evaporator fan feedback (commonly rendered Er FF) | The freezer fan motor, its harness and the board input that confirms rotation | Check fan first |
| Condenser fan feedback (commonly rendered Er CF) | The condenser fan in the machine compartment at the rear of the cabinet | Check fan first |
| Ice, water or dispenser fault (commonly rendered Er IF, Er IS or Er gF) | The ice compartment assembly or the dispenser water path, both of which are separate systems from cooling control on this cabinet | Usually elsewhere |
| Refrigerant or sealed system indication | A sealed system condition. This requires certified equipment and a qualified technician, and no board replacement resolves it | Not the board |
What Has to Be Ruled Out Before an EBR84433504 Is Worth Buying?
Before buying an EBR84433504, rule out the sealed system and linear compressor, the temperature sensors, the defrost heater and its sensor, the evaporator and condenser fan motors, the display board and its harness, and any remaining manufacturer coverage on the compressor. On this cabinet the compressor check comes first, because it is the only item on the list that can make a board purchase completely wasted money.
This belongs at the top of the list on this refrigerator and almost nowhere else. The LMXS30796 is built on a linear compressor platform, and published specification material for this model records longer manufacturer coverage on the compressor and the sealed system than on the rest of the appliance. A refrigerator that runs and runs without producing cold is describing that system, not the control board, and a new main board changes nothing.
This cabinet controls more separate spaces than a conventional French door refrigerator, including a CustomChill drawer with its own setting. Every one of those spaces reports through a sensor, and a sensor that has drifted or opened makes correct control logic produce incorrect behaviour. Sensors are inexpensive and they fail more often than boards do.
Frost building on the rear freezer panel is one of the most common presentations on this cabinet and it points at the defrost circuit long before it points at control timing. An open heater, an operated fuse or a defrost sensor out of range all produce the same steady loss of airflow.
Fan faults on this platform name a feedback loop, and that loop takes in the motor, its harness and the board input in equal measure. A motor that turns freely by hand can still fail to report back. The condenser fan sits in a machine compartment that collects dust, and a stalled one produces poor cooling that reads exactly like a control problem.
This refrigerator carries more than one board. A communication fault describes a link with two ends, so it implicates the display side and the wiring just as much as the main PCB. Replacing the main board on that code alone leaves two thirds of the possible causes untouched.
The number on your existing board decides this purchase, and on this cabinet it is very likely to read EBR78643431 rather than EBR84433504. Ordering from a model number instead of the label is how people on this family end up with a board built for a different model.
How Much Work Is an EBR84433504 Swap on a Four Door InstaView Cabinet?
Replacing an EBR84433504 is a moderate repair that most people complete in about 30 to 45 minutes. The board sits behind an access cover at the rear of the cabinet, secured by a small number of screws, with the harness connectors landing on labelled positions along the board edge. No part of the job requires opening the doors or disturbing the InstaView panel.
The physical job is straightforward. The board is behind a cover at the back of the cabinet and comes free once a small number of screws are out, with labelled connector positions along the board edge. What takes the time is getting to the back of a 36 inch four door cabinet in a fitted kitchen. Clear a path, empty the doors first so the cabinet is lighter and better balanced, and photograph every connector before anything is unplugged.
How Do You Prove Your Refrigerator Is an LMXS30796 and Not a 30776?
Read the full model code from the plate inside the fresh food compartment and compare it digit by digit, then confirm against the label on your existing board. The EBR84433504 is documented for LMXS30796S and LMXS30796D only. The LMXS30776, one digit away, takes a different board entirely, and so does the counter depth LMXC23796.
Model Number Check
Enter your refrigerator's model number to check it against our EBR84433504 compatibility records. Not found? Use the buttons below to reach our team directly.
Two checks, in this order. First the model plate inside the fresh food compartment, read digit by digit rather than from memory, because 30796 and 30776 differ by one character. Then the label on the board itself, which here will commonly read EBR78643431. Both checks pointing the same way is what confirms the order. Click the image to zoom in.
Which LG Refrigerators Actually Take the EBR84433504?
Parts records document the EBR84433504 for two model codes only, the LG LMXS30796S and the LMXS30796D, both listed in their /00 production form. These are the stainless and black stainless finishes of the same 29.7 cubic foot InstaView Door-in-Door four door refrigerator. No other LG model is documented for this board.
Confirmed Fitment, Stainless Steel Finish
Confirmed Fitment, Black Stainless Steel Finish
A two model list is unusual for an LG main board and it is the most important thing on this page. Models that are one digit away, or that share the same 796 ending, are documented for different boards in the same numbering family: the LMXS30776 takes one assembly in its earlier production and another in its later production, and the counter depth LMXC23796 and LMXC23746 each have their own. Production suffixes matter as much as the model code, because one model number can legitimately correspond to more than one board depending on when the unit was built. Treat any model list as a shortlist, confirm against the label on your existing board, and send us a photograph if you want it checked before you order.
How Is the EBR84433504 Restored to Spec? The FailSafe Precision Protocol
Every EBR84433504 sold by Appliance Pro USA goes through the FailSafe Precision Protocol, a proprietary 4-step process covering failure pattern analysis, precision diagnostic testing, proactive component replacement using equal or higher-rated parts, and final certification before the board ships.
FailSafe Precision Protocol
Failure Pattern Analysis
Known failure patterns for the EBR84433504 are mapped before any board enters the process, so we know exactly which components to focus on for this specific board type.
Precision Diagnostic Testing
Multi-point diagnostic testing identifies faults and confirms overall board condition. Boards that do not pass diagnostic testing do not advance.
Proactive Component Replacement
Components identified through failure pattern analysis as common weak points are replaced using equal or higher-rated parts, before the board is cleared to ship.
Final Certification
Certified to meet or exceed original LG factory specifications. Tamper-evident hologram applied. Anti-static packaged and sealed for shipping.
EBR84433504 Specifications and Cross-Reference Part Numbers
The EBR84433504 is an LG main PCB assembly for the LMXS30796 four door InstaView refrigerator, mounted behind an access cover at the rear of the cabinet, controlling compressor operation, fan outputs, defrost logic and sensor inputs. It is the current supply number for the earlier EBR78643431, and cross references recorded for it include AP6336476, PS12581463, EAP12581463, ALG54862, PD00061434 and 4878113.
| Board type | Main PCB assembly, described in parts records as the refrigerator main power control board |
| What it controls | Compressor operation, condenser and evaporator fan outputs, defrost logic and timing, temperature sensor inputs, and fault reporting to the display |
| What it does not control | The dispenser and display assembly is a separate board on this cabinet, and the InstaView panel, the door hardware and the ice system are separate assemblies |
| Brand | LG |
| Appliance | Four door French door refrigerator, 29.7 cubic foot class, InstaView Door-in-Door with a separately controlled CustomChill drawer |
| Cooling platform | Linear compressor. Published specification material for this model records longer manufacturer coverage on the compressor and the sealed system than on the balance of the appliance |
| Board location | Behind an access cover at the rear of the cabinet, secured by a small number of screws, with labelled connector positions along the board edge |
| Number to order by | The full number on the applied label. On this refrigerator that label commonly reads EBR78643431 |
| Supersession | Parts records list EBR78643431 as replaced by EBR84433504 |
| Documented fitment | LMXS30796S and LMXS30796D only, both in /00 production form |
| Neighbouring assemblies | EBR84433501, EBR84433503, EBR84433505 and EBR84433508 sit in the same numbering family, serve different LG models, and carry their own separate AP and PS references |
| Cross references | AP6336476, PS12581463, EAP12581463, ALG54862, PD00061434, 4878113 |
| OEM status | Genuine OEM LG board, restored to spec and FailSafe Certified |
| APU status | In Stock, FailSafe Certified, 1-year warranty (registration required), same-day shipping* |
Is an EBR84433504 the Right Spend on a 30 Cubic Foot InstaView Refrigerator?
When the board is genuinely the fault, replacing an EBR84433504 is normally the least expensive route back to a working refrigerator, because the cabinet it sits in is a large premium four door appliance that costs several thousand dollars to replace. The qualifier matters more here than on most boards, since a sealed system fault on this platform can make a board purchase entirely wasted.
What your options typically cost
Which Mistakes Cost People Money on This Particular LG Board?
The costly mistakes with an EBR84433504 are buying a board for a sealed system fault on a linear compressor cabinet, ordering from a model number that is one digit away from the right one, assuming a neighbouring suffix in the same numbering family will work, and rejecting a good board before the cabinet has had time to pull down.
Buying a board for a compressor problem
This is the expensive one on this platform. A refrigerator that runs continuously and slowly warms is describing a sealed system that cannot move heat, and the board is doing its job by asking for cooling that never arrives. Published specification material for this model records longer manufacturer coverage on the compressor and the sealed system than on the rest of the appliance, so find out what still applies to your serial number before spending anything.
Ordering from a model number that is one digit away
LMXS30796 and LMXS30776 are one character apart and they do not share a board. Neither does the counter depth LMXC23796, despite ending in the same three digits. Reading the model plate from memory, or half reading it, is the most common route to the wrong part on this family.
Treating EBR78643431 on your old board as a problem
It is not one. Parts records list EBR78643431 as replaced by EBR84433504, so finding that number on the board you are removing confirms the order rather than casting doubt on it. People stop mid repair over this, or return a correct board, because the numbers do not match.
Assuming a close suffix in the same family will do
The assemblies either side of this one mount the same way and look alike, but they are built for different models and carry their own separate retailer references. One serves the counter depth cabinet, another the earlier 30776, another later production of that same 30776.
Replacing the board for a code that names something else
Most codes on this platform name a sensor, a fan or a heater circuit. Those parts are cheaper, they fail more often, and a code naming them is telling you where to test first.
Judging the result before the cabinet has pulled down
A 29.7 cubic foot cabinet that has been warm for days does not return to temperature in an hour. Cooling control has to run a full cycle, defrost timing needs a complete interval, and the ice system needs the freezer at temperature before it produces anything.
Still not working after all of the above?
Contact our team before returning anything. A brief conversation resolves the majority of post-install situations. We stand behind every board we sell and are here to help you get the result you need.
Which Other Parts on an LMXS30796 Produce the Same Complaint?
Parts that produce the same complaints as an EBR84433504 fault on this cabinet include the linear compressor and sealed system, the temperature sensors for each controlled space, the defrost heater and its sensor, the evaporator and condenser fan motors, and the separate display assembly with the harness that links it to the main board.
Share your model number and a photo of your existing board's sticker. Our team will help confirm the right part before you spend a dollar. No pressure, no obligation.
Why Buy the EBR84433504 from Appliance Pro USA?
Appliance Pro USA supplies the EBR84433504 as a genuine OEM board restored through the FailSafe Precision Protocol to meet or exceed OEM specifications, backed by a 1-year warranty (registration required), a 30-day return policy, free priority shipping, and same-day shipping on orders placed before 4 PM EST, Monday through Friday.
At Appliance Pro USA, we specialize in high-quality reconditioned replacement control boards, professionally inspected and tested to meet or exceed OEM specifications. Every board we sell undergoes our FailSafe Precision Protocol, meaning components identified through failure pattern analysis as common weak points are replaced proactively using equal or higher-rated parts before the board ever ships to you. With a replacement board from Appliance Pro USA, you're getting a board that's been evaluated and restored to reliable working condition, backed by our 1-year limited warranty (registration required) and 30-day return policy, so you can order with complete confidence.
We offer free priority shipping on every order, and orders placed before 4 PM EST ship same day, Monday through Friday, excluding holidays and scheduled closures. Whether you're a homeowner tackling this repair yourself or a professional technician who needs a reliable source, we're here to help you get the right part and get the job done right the first time.
Not sure this is your board? Send us a photo of your original board's part number sticker and we'll confirm before you buy. Reach us at info@applianceprousa.com
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EBR84433504 LG Main Control Board, Frequently Asked Questions
These questions cover the details that decide this purchase: why the board you remove carries a different number, why the fitment list is only two models long, what the linear compressor platform means before you buy any board, and how the neighbouring numbers in this family actually map onto LG models.
My board says EBR78643431, not EBR84433504. Did I look at the wrong board?
Almost certainly not. Parts records list EBR78643431 as replaced by EBR84433504, so EBR84433504 is the number the same board is supplied under now. On an LMXS30796 that older number is what you should expect to find, and finding it confirms your order rather than contradicting it. What would suggest a different board is a number from another family, or a different final pair of digits. Send us a photograph if any digit is unclear.
Why is the fitment list only two models long when most LG main boards fit dozens?
Because those two model codes are the same refrigerator in two finishes. LMXS30796S is the stainless version and LMXS30796D the black stainless version of one 29.7 cubic foot four door InstaView cabinet, and parts records document this assembly for that cabinet alone. A short list is not missing data here. It is why the label on your board matters more on this part than on a board covering a whole series.
My model is an LMXS30776. Can I use this board?
No. The 30776 is a different refrigerator despite being one character away, and parts records assign it different assemblies in the same numbering family. It is also a model where the production suffix changes the answer, with earlier and later runs of the same model code documented for different boards. If your plate reads 30776, read the full suffix and let us confirm the right number before you order.
My refrigerator runs all the time and slowly gets warm. Is that this board?
That description points away from the board. If the compressor is running, the control side is asking for cooling and the problem is that the cooling is not arriving. On a linear compressor cabinet like this one that is a sealed system question, and published specification material for this model records longer manufacturer coverage on the compressor and the sealed system than on the rest of the appliance. Find out what still applies to your serial number before buying any part. Sealed system diagnosis needs certified equipment and a qualified technician.
The display shows nothing at all but the refrigerator is not cooling. Does that clear the board?
No, and it does not implicate it either. The board reports what it can measure, and the most serious faults on this cabinet are not things it measures directly, so a clean display is entirely consistent with a serious mechanical problem. Diagnose by what the cabinet is doing rather than by what the panel shows.
Does the EBR84433504 control the InstaView panel, the ice maker and the door hardware?
No. This is the main PCB and it handles compressor operation, fan outputs, defrost logic, sensor inputs and fault reporting. The dispenser and display assembly is a separate board, and the InstaView panel, the ice system and the door hardware are separate assemblies again. If your complaint is only about lighting behind the glass panel, ice production or a door, this board is unlikely to be the answer.
How do the neighbouring numbers in the EBR84433 family map onto LG models?
Not intuitively, which is the point. The suffixes are assigned per model and per production run rather than in any sequence you can reason about, and each carries its own separate retailer reference numbers. Two suffixes can serve the same model at different points in its production, while models whose numbers look almost identical land on entirely different suffixes. There is no shortcut, which is why the label decides it.
The CustomChill drawer will not hold temperature but everything else is fine. Is that the main board?
Check the drawer's own hardware first. That space has its own sensor and its own airflow path, and a fault confined to one controlled space usually starts with the parts serving that space. If the drawer sensor measures correctly at the board connector and the airflow path is clear and it still will not hold, the input circuit on the main board becomes the remaining candidate.
How long should I wait before deciding whether the new board fixed it?
Give it a full day. A cabinet this size that has been warm needs real time to pull down, defrost timing needs a complete interval before it can be judged, and the ice system will not produce until the freezer is at temperature. If the original complaint is unchanged after a day at a normal setting with the doors kept closed, contact us before returning anything.
Which Help Center Guides Support This LG Main Board Repair?
These Appliance Pro USA Help Center guides explain what a refrigerator main control board does, how to identify the correct board from a part number, why control boards fail, what to check when an appliance does not work straight after a replacement, and the tools the job needs.
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