SAMSUNG QLED SERIES (GENERAL) General Troubleshooting
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86%
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Main Logic Board
The Main Board contains the NAND flash memory where the system firmware resides. When data corruption occurs or a hardware-level 'watchdog' timer fails to receive a 'ready' signal from the CPU during the boot sequence, the system initiates a hardware reset to prevent a hard lock. This results in the infinite loop of the logo appearing and the screen going black.
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CHECK PRICE |
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8%
CONF
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One Connect Cable
On QLED models utilizing a One Connect box, this hybrid optical/copper cable carries both high-voltage DC power and high-speed data. Micro-fractures in the fiber optic strands or carbon tracking at the connectors cause intermittent data synchronization loss, which the TV's power management system interprets as a critical error, forcing a restart to re-establish the link.
SKU: BN39-02470A / SOC1001T
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6%
CONF
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Power Supply Board (PSU)
The power supply must handle a significant current inrush when the LED backlight array initializes during boot. Failing electrolytic capacitors or an aging PMIC (Power Management Integrated Circuit) can fail to maintain stable voltage rails under this load, causing a voltage sag that drops below the logic threshold, effectively 'brown-out' resetting the Main Board.
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DIY Repair Guide
Watch exactly how to replace the Main Logic Board.