Tag Lenovo 340c-15iwl

The main board short circuit causes the soft breakdown of PQ5303, which leads to the protection of the charging chip BQ24780, resulting in the non-conduction of the protection isolation circuit. Dismantle PQ5303, then connect PJ5301 node, turn on the power supply, turn on the power supply, the current instantly rises and jumps, and then connect the screen to test the perfect lighting machine.