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The key host does not respond when pressed
This may be the case that there is a problem in contact with the power supply. The chip of the power supply is damaged, and its capacitor will burst. We're going to need the first
First disassemble the machine, carefully check whether the motherboard is burned, and then carefully remove the damaged components with a hot-air gun
Then, use the multimeter to test whether 2P and 3P of TD1410 are short circuited, and connect the multimeter to test whether the power supply pin of 8202RQ is intact
Check whether the 720C power supply pin is short circuited. Finally, replace a power supply chip after checking all the conditions
Excluded. However, pay attention to the cause of this fault, which is capacitor short circuit due to large current. Therefore, pay attention to the stability of current when using
Qualitative.