After replacing a cracked LCD panel in an older business laptop, a technician notices the new screen still shows only a very faint image unless a flashlight is aimed at it. An external monitor connected through HDMI displays normally, and the laptop's brightness keys make no difference. Which internal component should the technician test or replace next to restore normal backlighting?
The LCD panel's cold-cathode fluorescent lamp (CCFL) requires high-voltage AC. On many laptops, a small inverter board converts the system's low-voltage DC into the AC needed for the lamp. If the inverter fails, the backlight never receives power, leaving the image barely visible even though the video signal and panel are good. Because the panel was already replaced and the external display works, the GPU, digitizer, and LVDS cable are unlikely causes.
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Why doesn't the GPU affect the backlight in this situation?
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