BN44-00939A (BN4400939A) Power Supply Board - Samsung QN55Q7FNAFXZA QN55Q7CNAFXZA QN55Q75FNFXZA QN55Q75CNFXZA

Replacement Samsung power supply board BN44-00939A (BN4400939A), compatible with 55" Q7 and Q75 series QLED TVs including QN55Q7FNAFXZA, QN55Q7CNAFXZA, QN55Q75FNFXZA, and QN55Q75CNFXZA. Board number L55E7NQ_NHS. Resolves common power delivery failures including no power, no backlight, and intermittent shutdowns.

Specifications & Board Identifiers

• Part Number: BN44-00939A (BN4400939A)
• PBA / Board Numbers: L55E7NQ_NHS | BN44-00939A
• Compatible Models: QN55Q7FNAFXZA, QN55Q7CNAFXZA, QN55Q75FNFXZA, QN55Q75CNFXZA
• Supported Version: Check white sticker on original board to confirm version match
• Product Type: Power Supply Board

Common TV Symptoms Fixed

• No Picture / Black Screen: TV powers on but display remains dark due to failed power delivery to backlight
• Power Issues: TV won't turn on, shuts off randomly, or gets stuck in standby mode
• Audio / Input Failure: Sound cuts out or HDMI/AV inputs stop responding due to power instability
• Smart Hub / Wi-Fi Errors: Apps freeze or network connectivity drops caused by inconsistent board voltage output

Fitment & Ordering Guidelines

• Verify the part number on the white barcode sticker of your original board matches BN44-00939A
• Confirm PCB board number L55E7NQ_NHS matches your original board before ordering
• Match your TV model suffix and version code exactly — minor variants may use a different board revision
• Basic electronics experience recommended for installation

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