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Dell inspiron 15 7559 notebook can’t be repaired without power on

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Dismantling the machine, it was found that the positions of the two P tubes where the power supply 19V went in were burnt black, and the backs were also black, especially the resistor of PR61 2R2 patch was cracked. Power-on test, measuring that the 12-pin 19V of the standby chip PU16 has passed. Press the switch line to trigger, indicating that it is repaired, installed and tested, and the machine is turned on perfectly.