LG TV UQ9000 BLACK SCREEN SOUND WORKING General Troubleshooting
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92%
CONF
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LED Backlight Strip Kit
The UQ9000 uses direct-lit LED strips that are prone to burnout. When an LED fails, the image remains visible only under a flashlight, while the audio remains functional because the main board is still processing signals. Replacing the full set of strips ensures uniform brightness and prevents future failures caused by old LEDs in the same circuit.
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VIEW ON AMAZON
#CommissionsEarned
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5%
CONF
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Power Supply Board (EAY Series)
The LED driver circuit on the power supply board manages the voltage to the backlight array. If the driver FET or capacitor fails, it cannot provide the necessary strike voltage to ignite the LEDs. This is less common than LED failure but is the secondary cause for a total backlight outage.
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VIEW ON AMAZON
#CommissionsEarned
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3%
CONF
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Main Logic Board
The main board sends the 'Backlight On' (BL_ON) signal to the power supply. If this logic gate is damaged, the TV will process sound and picture but fail to tell the backlight to illuminate. This is typically ruled out if the BL_ON voltage pin measures high (3.3V) during startup.
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VIEW ON AMAZON
#CommissionsEarned
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DIY Repair Guide
Watch exactly how to replace the LED Backlight Strip Kit.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
PartSniper is an automated parts recommender service. AI-generated results may not be correct. This data is not a substitute for professional engineering advice or manual inspection. Always verify part compatibility and disconnect power before any repair. PartSniper is not liable for inaccuracies, injury, or damage.