When an LG TV suddenly refuses to turn on, starts shutting itself off unexpectedly, or gives you sound without a picture, one of the first components you should investigate is the power supply board. Power-related failures remain some of the most common issues found in modern televisions, and fortunately, they are often among the easiest for DIYers to repair. At TVpartsToday, proudly known as The World's #1 Hub for DIY TV Repair, we help customers solve power-related TV problems every day with affordable replacement parts and practical troubleshooting guidance.
Today, we are taking a closer look at the EAY65904025 LG Power Supply, a critical component found in select LG television models. While compatibility varies by model and production run, this board plays a vital role in delivering stable voltage throughout the television and ensuring every major component receives the power it needs to operate properly. This part is typically in models OLED65C4PUA and OLED65C4AUA, among others. Below is an example photo of this part:
Before beginning any repair, always remember that safety comes first. Unplug the television and discharge any stored power by holding down the TV's physical power button for 60 to 120 seconds. Power supply boards can retain electrical charge even after the TV has been unplugged, so always exercise caution when handling internal components.
Would you rather watch a video and start your repair? Check out our helpful YouTube video on How to Get Started:
Understanding the Role of the Power Supply Board
The power supply board serves as the foundation of your television's electrical system. Its job is to convert incoming AC power from the wall outlet into the various DC voltages required by the main board, T-Con board, Wi-Fi module, backlights, and other internal components.
When the power supply begins to fail, symptoms can appear throughout the television, making diagnosis seem more complicated than it really is. Because so many components depend on stable voltage delivery, a faulty power board can mimic several other failures.
Common Symptoms of a Failed EAY65904025 Power Supply
A failing power supply can create a wide range of problems. Some TVs may show no signs of life whatsoever, while others may power on briefly before shutting down again. In many cases, owners report hearing sound while the screen remains completely black. Flashing standby lights, clicking sounds, popping noises, and random shutdowns are also frequently associated with power supply failure.
Another visual indicator can be damaged capacitors. If you open the television and notice swollen, leaking, or bulging capacitors on the power board, replacement is often necessary.
The good news is that many of these symptoms can be corrected by replacing a single board rather than purchasing an entirely new television.
Start With a Hard Reset
Before ordering replacement parts, it is always worth performing a complete power reset.
Disconnect the television from the wall outlet and press the physical power button on the TV itself for approximately thirty seconds. Leave the television unplugged for at least another minute before reconnecting power and attempting to start the set again.
Occasionally, software glitches or temporary electrical faults can create symptoms that resemble hardware failure. If the problem remains after the reset, the power supply becomes a much stronger suspect.
Do Not Overlook Backlight Issues
One of the most common diagnostic mistakes involves confusing a backlight failure with a power supply problem. If your TV has sound but no visible picture, performing a flashlight test can help determine which direction to pursue.
Turn the television on in a dark room and shine a flashlight across the screen at an angle. If you can see a faint image hidden behind the dark screen, the LCD panel is still functioning and the issue is likely related to the backlight system.
In many LG televisions, the power supply board is responsible for delivering voltage to the LED backlights. This means a failed EAY65904025 power supply can still be the root cause, even when the symptom appears to be backlight-related.
TVpartsToday Tip: A black screen does not automatically mean the panel has failed. In many cases, the issue can be traced back to the power supply board or backlight circuitry.
Why Exact Part Numbers Matter
One of the biggest mistakes DIY repair enthusiasts make is ordering replacement boards using board numbers instead of manufacturer part numbers.
LG power boards often contain multiple identifiers printed directly onto the circuit board. Many of these begin with "EAX" and are manufacturing board numbers, not replacement part numbers. While these numbers may appear important, they do not guarantee compatibility.
The correct replacement identifier is the manufacturer part number, in this case EAY65904025. This number is typically found on a barcode sticker attached to the board. Sometimes only the numeric portion is displayed, requiring you to add the EAY prefix when searching for a replacement.
TVpartsToday Tip: If you cannot determine which number is the actual part number, send us a clear photo of the board and barcode sticker. Our team can help identify the correct replacement quickly and accurately.
Replacing the EAY65904025 Power Supply
One reason power supply replacement is so popular among DIYers is that the process is relatively straightforward.
After unplugging the television and placing it face down on a soft surface, remove the rear cover and locate the power supply board. It is usually easy to identify because it connects directly to the power cord input.
Before disconnecting any cables, take several photos of the board and its connections. This makes reassembly much easier later. Carefully disconnect all cables and remove the mounting screws securing the board to the chassis. Install the replacement EAY65904025 board, reconnect all cables, and secure everything back into place.
Once the rear cover is reinstalled, reconnect power and test the television.
TVpartsToday Tip: Taking pictures before disconnecting anything can save significant frustration during reassembly and helps ensure every cable returns to its proper location.
Why Repairing Makes Sense
Many people assume that a television experiencing power issues is beyond repair. In reality, power supply failures are often among the most cost-effective repairs available. Replacing a faulty board can restore years of additional life to a television for a fraction of the cost of buying a new set.
Just as importantly, DIY repair reduces electronic waste and allows you to keep a television you already know and enjoy.
The EAY65904025 LG Power Supply is a critical component that can cause a variety of frustrating symptoms when it begins to fail. Whether your television will not power on, shuts off unexpectedly, produces sound without a picture, or displays a blinking standby light, the power supply should be one of the first components you investigate.
Always remember to match the exact part number, not the EAX board number or any other manufacturing identifier. Proper part identification is one of the most important steps toward a successful repair.
At TVpartsToday, we are committed to helping DIYers diagnose problems accurately, source the correct replacement parts, and complete repairs with confidence. That commitment is why we proudly remain The World's #1 Hub for DIY TV Repair, providing trusted guidance, tested parts, and real support every step of the way.
Need Help?
If you’re still unsure about the issue or need to replace a part, reach out to TVpartsToday. We can help you identify the exact cause of the problem and provide the right replacement part!
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