EBR78643414 LG Refrigerator Main Control Board, the Assembly Four Part Numbers Point At and No Two Catalogues Agree About
Part EBR78643414 is the LG refrigerator main control board catalogued by the manufacturer as a main PCB assembly, and it carries an identity problem that no other board in this family has quite so badly. Four separate part numbers resolve to it across the parts trade. One catalogue records it as the current number and treats EBR84433501 as the one it replaced. Another records the arrow pointing the other way. A third lists it as substitutable across a small cluster of neighbours. All of them agree on one thing: the number stamped on the board in your refrigerator is no longer produced. This guide covers what is actually documented for this assembly, which cross reference belongs to which board, why an AP number search can land you on the wrong one, and which cheaper faults imitate it.
Which Symptoms Bring People to the EBR78643414?
Owners bring an EBR78643414 into the conversation when temperatures wander in both food sections at once, when frost seals the rear freezer panel because no defrost is being timed, when the convertible drawer ignores whatever it has been set to, when the door panel goes dark or deaf, and when the machine compartment falls silent although the outlet is live.
Think of this assembly as the arbitrator. Sensor values arrive here, cooling decisions are made here, and the outputs that follow reach the compressor circuit, the defrost timer, the fans, the dispenser and ice hardware, and the panel on the door. One arbitrator serving that many systems produces a characteristic signature when it goes wrong. Rather than one clean casualty, several unrelated functions slide out of tune inside the same short window.
- Warming in both food sections together, with lighting and panel behaving as though nothing were wrong
- Silence from the machine compartment, or a start attempt that abandons itself before a run establishes
- A rear freezer panel glazing over until airflow is choked, because no defrost is being timed
- A door panel that has gone dark, or frozen, or deaf to presses, above a cabinet that keeps cooling
- A convertible drawer parked at the wrong temperature whatever setting is chosen for it
- Dispensing and ice production stopping in the same week as a temperature or defrost complaint
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Why Do Four Different Part Numbers Resolve to One Board?
Independent parts records tie EBR78643414 to the EBR84433501 assembly, and one catalogue widens that link to include a second EBR84433 number and a neighbouring EBR78643 number. The records disagree about which of them replaced which. None of that is settled by reasoning about the digits, only by reading the label on the board you remove.
This short video shows how to find and read the label on an appliance control board and how to confirm a part before packaging is opened. On this assembly the reason to do it is unusually practical. Search the trade by number and you will be shown records that merge two boards into one entry, carrying both sets of cross references. Photograph the label on the board you take out, read it to the final character, and buy against that rather than against whichever number a search box chose to show you.
Is the Fault in One Function, or in the Assembly That Commands All of Them?
Sort the complaint by how many systems it touches. A refrigerator with exactly one broken function and everything else in order is describing the hardware that performs that function. A refrigerator with several unrelated functions wandering at the same time is describing whatever they all report to.
Each row below is a testing direction, never a verdict. Four subsystems answer to one assembly here: the two food compartments, the convertible drawer, the ice system and the through door dispenser. That span is why complaints originating in four different places converge on the board far more often than the evidence supports.
| Symptom | What It May Indicate | Recommended Next Step | Board? |
|---|---|---|---|
| Neither food compartment holds temperature, panel and lighting normal | Cooling is being requested and not arriving, or was never requested | Verify by eye that each evaporator fan comes up, then take readings from the compartment sensors. Feed this assembly nonsense and it will act indistinguishably from an assembly that has died. | Common |
| Rear freezer panel packed with frost and airflow choked off | Defrost timing has stopped, or the heating circuit is open | Put a meter on the heater, the thermal fuse and the defrost sensor first. This board only schedules the cycle; three inexpensive parts have to survive for it to finish. | Defrost parts first |
| Middle drawer will not hold its selected temperature, rest of cabinet fine | The drawer's own damper, heater or sensor rather than cabinet logic | Interrogate the drawer sensor and the damper that feeds air to it. When one compartment misses its target and the other two track correctly, the fault is local to that compartment. | Drawer hardware |
| Water and ice both stop, temperatures perfectly normal | The dispenser hardware, the fill valve, or a supply line frozen in the door | Hunt for a frozen line, then the inlet valve, then the dispenser switches. A single silent subsystem on a refrigerator that is otherwise thriving points away from cabinet logic. | None |
| Three or more unrelated systems go wrong in the same short period | A shared point of control rather than a run of bad luck | When cooling, defrost and the drawer degrade in concert, the thing they hold in common is the strongest candidate. Eliminate sensors and fans, then give the board serious weight. | Board-related |
Does Any Display Code on This Cabinet Actually Name the Main Board?
Published LG code sets for refrigerators of this generation contain no entry that identifies the main control board by itself. Each two character readout points at a fan, a sensor, a defrost attempt, an ice or dispenser component, or a broken conversation between two boards. Reaching this assembly means excluding all of those. Procedures and meanings vary by model and revision.
Understanding that reframes what a readout is worth. What appears on the panel is the circuit the refrigerator is complaining about, not the assembly doing the complaining. In many cases the complaint concerns a component the board is simply observing, and swapping that component closes the repair. In others the refrigerator has lost touch with something it expects to find, which is a wiring problem at least as frequently as a logic problem. Check every meaning against your own unit's documentation before money changes hands.
| What the display reports | What It May Indicate | Is It This Board? |
|---|---|---|
| A readout naming an evaporator fan circuit | Rotation cannot be confirmed. Blade contact with ice, a motor near the end of its life, or a feed that has opened will each raise this well before any logic fault would | Fan first |
| A readout naming a compartment temperature sensor | A value that is shorted, open or nowhere near plausible. LG's own published sequence for this era begins at the connector, moves to resistance, and arrives at the board only at the end | Sensor first |
| A readout naming the defrost attempt or defrost sensor | Defrost ran out of time without finishing. Three components stand between the instruction and the result, being heater, thermal fuse and defrost sensor | Test the defrost circuit |
| A readout describing lost communication with the panel | Two boards that can no longer hear each other. The wiring loom that bends at the hinge gives out considerably more often than either board on its ends | Harness before board |
| A readout pointing at the sealed refrigeration system | A refrigeration problem rather than an electronic one. Certified equipment and a qualified technician are required, and no control board resolves it | None |
| Nothing on the display at all while the cabinet stays warm | A refrigerator that has quietly given up asking for cooling while recognising nothing as a fault. Of everything in this table, this leans furthest toward the assembly | Board-related |
Which Cheaper Failures Have to Be Cleared Before Ordering an EBR78643414?
Four questions decide whether an EBR78643414 is worth buying: does the label on your existing board read this number to its last character, do the compartment sensors measure sensibly at their connectors, do the defrost heater and thermal fuse show continuity, and does every fan blade rotate without resistance. Only the first costs anything beyond time.
This is the first check on this part rather than the last, because the numbering around it is genuinely contradictory. Trade records merge this assembly with an EBR84433 number and carry both sets of cross references under one heading, and catalogues disagree over which of the two came first. A search result is not evidence of what is in your refrigerator. The applied white label is.
Nothing else feeds this assembly. Supply it with a shorted, open or implausible value and its cooling decisions become nonsense, and nonsense from the logic is what a dead board also looks like from the kitchen doorway. There is a reason LG's own sequence for this era finishes at the board instead of starting there. Sensors cost very little and they give out with some regularity.
Ice sealing a freezer shut ranks among the commonest complaints on refrigerators of this capacity, and cabinet logic is rarely responsible. Scheduling is all this board contributes. Execution needs current through a heater, a thermal fuse that has not operated, and a defrost sensor still willing to report. Take any one away and airflow dies the same way each time.
Several air circuits operate on this refrigerator, and cooling stops entirely without any electronic fault if a blade is gripped by ice or a bearing has gone out of round. Usefully, they fail with different fingerprints. A jammed freezer side fan produces a cold freezer above a warm fresh food section. A condenser fan that has quit produces a refrigerator that never stops running and never arrives.
Silence from the machine compartment is what you get from a compressor that will not start, and it is also what you get from logic that has died. Telling those two apart before spending is the difference between a repair and a donation. Worth knowing as well: on LG refrigerators of this generation the compressor and sealed system are often covered for longer than the balance of the appliance, so read your own paperwork before you pay anyone.
Where Does the EBR78643414 Sit, and How Long Does the Swap Take?
Most people get an EBR78643414 changed inside 20 to 40 minutes. Our own product records put this assembly behind the rear access panel at the back of the refrigerator, which means the appliance has to be brought forward far enough for someone to work behind it before any part of the job begins.
Nothing about the swap itself is demanding. Undo a few screws, release the harnesses at their latches, lift the assembly off its standoffs. The clock runs on access and on remembering which connector belonged where. Bring the refrigerator forward until you can stand squarely behind it, and take a photograph of the populated board before your hand goes anywhere near a plug.
Does the EBR78643414 Fit Your LG Refrigerator?
The way to confirm an EBR78643414 is to read your existing board's applied label through to its last character. A model lookup opens the question rather than closing it here, since the documented fitment rests on one parts record and since the production suffix trailing the model code determines which assembly a given refrigerator was built with.
Model Number Check
Enter your refrigerator's model number to check it against our EBR78643414 compatibility records. Not found? Use the buttons below to reach our team directly.
Only the applied white label carries all eleven characters of the assembly number. Because numbers in this family are merged and cross linked throughout the trade, one catalogue heading can stand in front of two different boards. What resolves that is the label on the board coming out of your refrigerator. Click the image to zoom in.
Which LG Models Are Documented Against the EBR78643414?
The parts record for the EBR78643414 documents it against LG's 30 cubic foot French door platform, specifically the LMXS30776S and LMXS30776D cabinets, with the production suffixes 03 and 02 named respectively. Later production of the same two cabinets is documented against a different assembly, so the suffix after the model code matters more here than the model code itself.
Documented Fitment, Confirm Against Your Label
Codes appear above in base form, stripped of the production suffix that usually trails a slash or a dot. Two warnings count for more than the brevity of the list. The first is evidential: one parts record underwrites this fitment, not a consensus of several, so read it as a strong indication and let your own board's label decide. The second concerns what is absent. Later production of these very LMXS30776 refrigerators is recorded against a different assembly, while the adjacent LMXS30796 and LMXC23796 cabinets each answer to their own. Trade listings describe brand coverage as LG and Kenmore, yet no verifiable source produced a Kenmore code for this number, so none appears here. Rating plate nearly but not exactly matching? Photograph your board label and send it over before ordering.
How Is the EBR78643414 Restored to Spec? The FailSafe Precision Protocol
Every EBR78643414 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 EBR78643414 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.
EBR78643414 Specifications and Cross-Reference Part Numbers
The EBR78643414 is catalogued by LG as a main PCB assembly and described across independent parts records as the main control board and main power control board for the refrigerator. The cross references recorded specifically against this number are AP6028920, PS11761227 and EAP11761227, alongside an internal four digit series number and a distributor reference.
| Manufacturer part number | EBR78643414. Catalogued through LG parts channels as a main PCB assembly, and described in independent parts records as the main power control board assembly for the cabinet |
| Board type | Main control board. This is the cabinet's central logic assembly. It is not a display board, not an ice maker board, and not a separate compressor drive module |
| What it controls | Temperature sensor inputs, cooling calls and compressor operation, the fans, defrost timing, the convertible middle compartment, the door panel, and the dispenser and ice hardware |
| Cabinet served | LG's 30 cubic foot French door platform, sold under the LMXS30776 codes, with a through door dispenser, an ice system and a convertible middle compartment between the two main food sections |
| Cross references, this number | AP6028920 is recorded against EBR78643414 directly, with PS11761227 and EAP11761227 as its matching pair, plus an LG internal reference in the 4324 series and a distributor code. Whatever reference you shop by, match the applied label before ordering |
| Cross references, the linked number | Records also carry AP6336473, PS12581460, EAP12581460 and a 4878 series internal reference. Those belong to the EBR84433501 assembly, not this one. Because several databases merge the two entries, a search on either set can return either board |
| Supersession and supply | Contested between sources. One record treats EBR84433501 as the previous number and this assembly as the current one. Others record EBR84433501 as the replacement for this number and continue to supply it. A further catalogue lists this number as substitutable across a small cluster in the same two families. Every source agrees that EBR78643414 itself is recorded as discontinued or no longer available, which is why a certified original rather than a new-old-stock hunt is the realistic route for these cabinets |
| Sibling caution | The EBR78643 series runs to dozens of separate assemblies. Neighbouring numbers ending 401, 402, 405, 409, 415, 425, 431 and 434 are distinct boards with their own model lists and their own AP and PS references. Proximity in the number proves nothing about fitment |
| APU status | FailSafe Certified, 1-year warranty (registration required), same-day shipping* |
Is an EBR78643414 the Right Spend on a 30 Cubic Foot French Door Cabinet?
With sensors, fans and defrost hardware eliminated and the assembly genuinely responsible, an EBR78643414 is usually the cheapest way to get a refrigerator working again, since what surrounds it is a full size 30 cubic foot French door appliance costing an order of magnitude more to replace outright.
What your options typically cost
Which Mistakes Turn a Correct EBR78643414 Into a Failed Repair?
Four things sink an EBR78643414 repair: choosing the board from a merged catalogue entry rather than from a label, missing a sensor or defrost fault that was the real story all along, seating a harness one position over, and passing judgement before the refrigerator has had any opportunity to pull down.
Compare the label you removed against the label you fitted
This is the mistake the numbering around this part is built to produce. Two assemblies share a merged catalogue entry and a combined list of cross references, and a lookup that returns the linked number will sell you a board that is not what came out. A part that fits mechanically and behaves oddly is the signature of an ordering error, not a faulty component.
Go back to the sensors before you blame the new board
A sensor jammed short or open serves the replacement the identical impossible number it served the original, and the refrigerator behaves precisely as it did an hour earlier. Nothing on this list causes more perfectly good parts to be sent back.
Return each harness to the position it left
Neighbouring connectors on this assembly look alike, and a plug landed one position over yields behaviour nobody can distinguish from a dead board. That photograph taken before removal is the shortest route back out.
Rule out a showroom setting before condemning anything
Some LG cabinets can be left in a demonstration mode that lights the panel, accepts every setting and never runs cooling. A refrigerator that looks entirely alive and still will not get cold is worth checking for this before a part is blamed.
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 Cheaper Parts on This Cabinet Fail With the Same Symptoms?
Components capable of imitating an EBR78643414 fault include every compartment temperature sensor, the defrost heater together with its thermal fuse and defrost sensor, both evaporator fan motors and the condenser fan, the convertible drawer's damper and sensor, and the door display assembly plus the loom bending at the hinge.
Share your model number and a photo of your board's label. Our team will confirm the right part before you spend a dollar. No pressure, no obligation.
Why Buy the EBR78643414 from Appliance Pro USA?
Appliance Pro USA supplies the EBR78643414 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 label and we'll confirm before you buy. Reach us at info@applianceprousa.com
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EBR78643414 LG Refrigerator Main Control Board, Frequently Asked Questions
These questions cover why a search returns two boards under one heading, which cross references belong to this number, what the contested supersession actually means for a buyer, why the production suffix after the model code decides fitment, what a discontinued status changes, and whether a neighbouring number in the same series can be used instead.
My board says EBR78643414 but the catalogues keep showing me a different number. Which one do I need?
The one on your board. Parts databases have merged this assembly with the EBR84433501 record, which is why a search on either number can return an entry carrying both sets of cross references. That merge is a filing decision, not a statement about what is inside your refrigerator. If the label you removed reads EBR78643414, order that number and ignore whichever heading the search box displayed. If the label is damaged or unreadable, send us a photograph of it with your full model code and we will work through it with you.
Why does one source call EBR84433501 the older number and another call it the newer one?
Because the records genuinely disagree, and we would rather say so than pick the version that suits us. One parts database treats EBR84433501 as the previous number and this assembly as the current one. Others record the change running the opposite way and continue to supply the EBR84433501. We could not reconcile those into a single arrow with any confidence. What every source we checked does agree on is that EBR78643414 itself is no longer being produced, which is the part of the picture that actually affects your decision.
I searched an AP number and got two different boards. Which cross references belong to this part?
AP6028920 is the reference recorded directly against EBR78643414, with PS11761227 and EAP11761227 as its matching pair. The AP6336473 and PS12581460 references belong to the linked EBR84433501 assembly. Because several databases hold both sets under one merged entry, searching by any of them can return either board. This is the most common way people end up with the wrong part on this platform, and it is avoidable by buying against the label rather than against a cross reference.
My refrigerator is an LMXS30776 but the digits after the model code are not 02 or 03. Is this still my board?
Possibly not, and this is worth taking seriously. The parts record that documents this assembly names the LMXS30776S and LMXS30776D cabinets with specific production suffixes attached, and later production of those same two cabinets is documented against a different assembly. The characters after the model code describe the production run, so they are part of the identification rather than decoration. Treat the model code as the way to reach the right diagram, and treat the suffix plus the board label as the things that actually decide the purchase.
The part is listed as no longer produced. Does that mean my refrigerator cannot be repaired?
No. A discontinued status means the manufacturer has stopped producing new stock of that number, not that the cabinet is beyond help. This is exactly the situation certified original boards exist for. The board we supply is a genuine OEM assembly carrying this number, restored through the FailSafe Precision Protocol and backed by a 1-year warranty with registration and a 30-day return window. On a cabinet of this size that is normally a far better outcome than replacing an otherwise sound refrigerator.
A catalogue listed a neighbouring number as an equivalent. Can I fit that instead?
We would not rely on it. One catalogue does describe this number as substitutable across a small cluster in the EBR78643 and EBR84433 families, but that claim appears in a single source and is not corroborated anywhere else we looked. Numbers in the EBR78643 series that sit one or two digits apart are separate assemblies with their own model lists and cross references. Fitting a neighbour on the strength of one catalogue note risks a board that mounts correctly and controls your cabinet incorrectly, which is harder to diagnose than the problem you started with.
My cabinet is completely silent. Does that settle it as the board?
By itself, no. Silence is equally consistent with dead logic and with a compressor circuit that will not start, and from the kitchen those two look the same. Put your ear to the machine compartment and note which happens: repeated attempts that fade, or no attempt whatsoever. Prove the outlet, inspect the harness running into the machine compartment, and eliminate the sensors and fans. Read your paperwork too, because the compressor and sealed system on refrigerators of this generation are often covered for longer than the balance of the appliance. With all of that genuinely behind you, an appliance with power and nothing coming out of it makes a reasonable board case.
Where Can You Read More Before Ordering This Board?
The Appliance Pro USA Help Center articles below support this guide. Between them they explain how to lift a part number from a board, what a refrigerator's central logic assembly is answerable for, which operating conditions cut a board's life short, and what to check when a brand new board changes nothing.
Ready to order the EBR78643414?Available now at Appliance Pro USA, backed by our 1-year warranty (registration required) and 30-day return policy.
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