Locate the small 9-pin or 12-pin OVP IC on the schematic. Check if 5V enters the IC and successfully exits it. If 5V enters but 0V exits, bypass or replace the OVP IC.
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: Solutions for fluctuating displays or non-working lights often involve reballing the CPU or checking the Vph line coil. : Specific Charging Ways Solution Locate the small 9-pin or 12-pin OVP IC on the schematic