If your Samsung TV refuses to turn on, powers off unexpectedly, or produces sound without displaying an image, the power supply board is one of the first components to investigate. Power-related issues are among the most common causes of TV failure, and in many cases, replacing a single internal board can restore full functionality without the need to purchase a new television.
Today’s spotlight is on the BN44-01329A Samsung Power Supply (shown above) - a key player in several Samsung TV models that can cause major headaches when it fails. Some examples of model numbers with this part could be, but not limited to, the following: QN77S90DAFXZA, QN77S90FAFXZA.
At TVpartsToday, the World’s #1 Hub for DIY TV Repair, we frequently help customers resolve these exact symptoms by replacing the Samsung BN44-01329A power supply board. This component is responsible for distributing stable voltage throughout the television, allowing the main board, backlight system, and other internal circuits to operate correctly.
Would you rather watch a video and start your repair? Check out our helpful YouTube video on How to Get Started:
Recognizing Power Supply Failure
When the BN44-01329A begins to malfunction, the symptoms often appear suddenly. A TV may fail to turn on entirely or may shut down shortly after startup. In some cases, the television will produce audio while the screen remains black.
A flashing standby light, clicking noises from inside the set, or visible bulging capacitors on the power board may also indicate electrical instability. These issues can prevent the backlight system from receiving adequate voltage, resulting in a dark display even though the panel itself is still functional.
TVpartsToday Tip: A black screen with working sound often points toward a power or backlight issue rather than panel failure.
Starting With a Power Reset
Before opening the TV, performing a hard reset is recommended. Disconnect the television from the wall outlet and hold the physical power button on the set for approximately thirty seconds. Leave the TV unplugged for an additional minute before reconnecting power.
If the TV continues to shut off or fails to start after this reset, the BN44-01329A power supply may require replacement.
Using the Flashlight Test to Confirm Backlight Issues
Backlight failure can resemble a power supply issue, so performing a flashlight test can help narrow down the cause. With the TV powered on in a dark room, shine a flashlight across the screen at an angle. If faint images or menu outlines become visible, the backlights are not receiving sufficient power.
In this scenario, the BN44-01329A may be unable to supply the voltage required to illuminate the LED strips.
As the World’s #1 Hub for DIY TV Repair, TVpartsToday recommends diagnosing backlight power delivery before assuming panel damage. To be sure if it is an illumination problem, perform the Flashlight Test! We have instructions on that HERE.
Matching the Correct Replacement Part
Samsung power supply boards often contain multiple printed numbers, including manufacturing references that do not indicate compatibility. The BN44-01329A part number will typically appear on a white barcode sticker attached to the board.
Ordering by this exact manufacturer part number is essential. Relying on board numbers or TV model alone can result in incompatible replacements.
TVpartsToday Tip: Matching by part number ensures your replacement board communicates correctly with the TV’s internal components.
Replacing the BN44-01329A Power Supply
Replacing a power supply board is a straightforward DIY repair when performed carefully. Disconnect the TV from power and place it face down on a padded surface before removing the rear panel.
Locate the BN44-01329A board and take reference photos of all cable connections. Disconnect each cable gently before removing the mounting screws and transferring the replacement board into position. Reconnect all cables securely and reassemble the TV before testing.
For many customers, this process restores stable power delivery and resolves startup failures immediately. Struggling with this process? Below is a video showcasing a similar repair:
Repair Instead of Replace
A malfunctioning power supply may appear to signal the end of your TV’s lifespan, but it is often one of the easiest components to replace. Completing this repair at home can eliminate the cost of purchasing a new television.
At TVpartsToday, the World’s #1 Hub for DIY TV Repair, we provide replacement power supply boards for all major brands along with expert support to help you identify the correct part. With proper troubleshooting and part number matching, restoring your Samsung TV is often far simpler than expected.
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!
Would you rather watch a video? Check out our helpful Troubleshooting 101 playlist over on YouTube!
Would you rather chat with a seasoned repair expert? Head on over to our TVRepairHelp subReddit!
We also have a helpful chatbot called the Wizard of TV Repair that may be of assistance!
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