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If you have checked the connections and cables on the back of the LG 48" Class B4 Series OLED 4K UHD Smart webOS TV (2024), Model # OLED48B4PUA, and your connected devices, if you have more than one, and made sure that none of the cables are loose or faulty and you are not getting any picture, the TV will have to be inspected by a service technician to determine what the issue is and resolve it...^Ivan.
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