If you need to replace the power adapter for your LG monitor, or if you’re trying to confirm whether the ADS-45SQ-19-3 19040E is the right fit for your device, this guide provides accurate, verified information to help you make the right choice.
Understanding the LG ADS-45SQ-19-3 19040E Power Adapter
The LG ADS-45SQ-19-3 19040E is a 40W external AC power adapter designed specifically for a range of LG monitors. It delivers 19V DC at 2.1A and uses a 6.5mm x 4.4mm barrel connector with a center pin. The adapter accepts worldwide input voltage of 100-240V, 50/60Hz, making it suitable for international use.
This adapter is manufactured by Shenzhen Honor Electronic and carries several identifiers, including the LG part number EAY65890001 (validated for select models like the 32GN50R) and other equivalent models such as ADS-45SN-19-3 19040G, ADS-45FSQ-19 19040EPG-1, and LCAP21C.
Why the Correct Adapter Model Matters
LG monitors are designed to work with specific adapter models, not just any adapter with matching voltage and current. Even if an adapter provides 19V and 2.1A, using a model number that isn’t validated for your monitor may result in the monitor not powering on, displaying an error message, or failing to charge properly. This is why it’s critical to match the adapter model number (e.g., 19040E vs. 19032E) in addition to the electrical specifications.
Which LG Monitors Use the ADS-45SQ-19-3 19040E Adapter?
Based on official LG documentation, the ADS-45SQ-19-3 19040E adapter is compatible with the following monitor models (list may not be exhaustive):
- LG UltraGear Series: 27G440A, 27G610A, 32GN650-B.AMQ
- LG LB70 Series: 24LB70, 27LB70
- LG Ergo Series: 32UK580
- LG Business Monitors: 27BA45U-B.AEU
- Other compatible monitors: 32GN550-B, 27UK580, and various LG LCD/LED monitors such as E1948SX, E2251T, IPS277L-BN, and 22M35D (check your device manual for confirmation)
Important note: Some LG monitors that look similar and share the same voltage may use a different model of adapter. For instance, the LG 27GQ50F-B and LG 32MR50C-B are documented to use the ADS-45SQ-19-3 19032E adapter, not the 19040E. Always verify your monitor’s service manual or the label on your original adapter before purchasing a replacement.
How to Verify Compatibility Before Buying
Follow these three steps to ensure you get the right adapter:
- Check the adapter model on your old unit: Look for the model number (e.g., 19040E, 19032E, 19040G) printed on the label of your existing adapter. Match it exactly if possible.
- Consult your monitor’s user manual or service guide: LG often lists the approved adapter model numbers in the specifications section. This is the most reliable source.
- Inspect the connector: Ensure your monitor has a 6.5mm x 4.4mm barrel jack with a center pin. A physical mismatch will prevent the adapter from working.
OEM Equivalent Models
LG officially recognizes several adapter models as functional equivalents to the ADS-45SQ-19-3 19040E. These models have the same electrical output and connector type, and they are often used interchangeably:
- ADS-45SN-19-3 (19040G)
- ADS-45FSQ-19 (19040EPG-1, 19040EPK-1, 19040EPCU-1)
- LCAP21C
- AD10530LF
If you cannot find a 19040E, one of these equivalents may work, provided it is listed for your monitor model. However, always verify against your monitor’s approved parts list.
Common Replacement Mistakes
Based on real-world user experiences, here are the most frequent errors when replacing an LG monitor adapter:
- Buying based on voltage and wattage only: Many users assume any 19V 2.1A adapter will work, but the monitor may reject a non-approved model number.
- Ignoring the model number suffix: 19040E and 19032E are both 19V 2.1A, but they are not interchangeable for all monitors.
- Using a universal adapter without checking monitor validation: Universal adapters may not be recognized by LG monitors, leading to power failure or error messages.
- Reusing a damaged power cord: The power cord (C5/C6 cloverleaf type) can fail independently of the adapter brick. Always test with a known-good cord.
Troubleshooting: When Your Adapter Isn’t Working
If your LG monitor does not power on or shows a message about using the correct adapter, try these steps:
- Confirm the adapter model number: Check the label on the brick. If it’s not one of the approved models for your monitor, it may be the cause.
- Test the adapter on a different compatible LG monitor (if available) to isolate whether the issue is with the adapter or the monitor.
- Replace the power cord: A faulty C5/C6 cord can prevent power from reaching the adapter or the monitor.
- Perform a power reset: Unplug all cables, press and hold the monitor’s power button for 15 seconds, then reconnect and try again.
- Check for physical damage: Look for frayed cables, bent pins, or a cracked housing on the adapter.
If you have confirmed that the adapter model is correct and the monitor still does not work, the issue may lie with the monitor’s power input board.
Maintenance and Lifespan
With proper care, the ADS-45SQ-19-3 19040E adapter can last 3-5 years or more. Signs that it may need replacement include:
- Intermittent power loss during monitor use.
- Excessive heat even when the monitor is idle.
- Audible buzzing or humming from the adapter brick.
- Visible damage to the cable or connector.
- No LED indicator (if present) when plugged into a live outlet.
To extend lifespan, avoid bending the cable sharply near the connector, keep the adapter in a well-ventilated area, and unplug it by pulling the plug rather than the cable.
Frequently Asked Questions
What is the difference between ADS-45SQ-19-3 19040E and 19032E?
Both are 19V 2.1A adapters with the same connector, but they are different model variants. LG validates specific models for specific monitors. For example, the 27GQ50F-B uses 19032E, while the 27G440A uses 19040E. They are not always interchangeable.
Can I use a 19V 2.1A adapter from another brand with my LG monitor?
It may physically fit, but the monitor may not recognize it. LG monitors often validate the adapter’s identification; using a non-approved brand can result in an error message or no power at all.
Why does my LG monitor say “please use the adapter that was provided with this monitor”?
This message appears when the monitor detects an adapter that is not on its approved list. Even if the voltage and current match, the model number must be compatible.
Does the ADS-45SQ-19-3 19040E come with a power cord?
No. The adapter brick requires a separate C5/C6 (cloverleaf) power cord, which is sold separately.
Is the EAY65890001 the same as 19040E?
EAY65890001 is an LG part number that has been associated with some adapters (e.g., for the 32GN50R), but it is not a universal equivalent to 19040E. Always rely on the model number printed on the adapter label rather than the EAY number.
Can I use the ADS-45SQ-19-3 19040E for a laptop?
This adapter is designed for LG monitors and is not validated for laptop use. Even if the connector fits, the voltage and current may not meet the laptop’s requirements.
How do I know if my adapter is genuine?
Genuine LG adapters have clear labeling with the model number, manufacturer (Shenzhen Honor Electronic), output specifications, and safety certifications. The build quality should be solid, and the connector should fit snugly without wobbling.
What should I do if my adapter gets very hot?
Unplug it immediately and let it cool. Check that the adapter is not covered or placed on a soft surface that blocks ventilation. If it consistently overheats, replace it.
Can I travel with this adapter?
Yes, it supports 100-240V input, so you only need a plug adapter for the destination country; no voltage converter is required.
Where can I find the model number on my adapter?
Look on the main label of the adapter brick. It is usually printed near the output specifications and will say something like “MODEL: ADS-45SQ-19-3 19040E”.
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