LG TV UP8000 BLACK SCREEN SOUND WORKING General Troubleshooting
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
85%
CONF
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LED Backlight Strips (Full Set)
The most common failure mode for the UP8000 series involves the failure of one or more LEDs within the backlight array, which triggers a protection circuit that shuts down the entire backlight string while leaving audio intact. Replacing the full set of strips restores the light source for the LCD panel.
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|
|
10%
CONF
|
Power Supply Board (LGP43-21U1)
If the backlight LEDs are intact, the failure often lies within the LED driver circuit located on the power supply board. This board is responsible for converting AC power to the constant current required by the LED strips; a failure here prevents the LEDs from illuminating.
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|
|
5%
CONF
|
Main Logic Board
In rare cases, the main board may fail to send the 'Backlight On' (BL_ON) signal to the power supply. While sound still processes, the lack of this logic signal keeps the screen dark.
SKU: EBT66492903
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DIY Repair Guide
Watch exactly how to replace the LED Backlight Strips (Full Set).
// 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.