1, U20 (KB910) EC control chip, if Pseudo Soldering, there is no response when press the power button; if KB930 damaged, will often appear system halted, or no response when boot, or the keyboard will not be able to use.
2, C362, C363 resonant capacitance, if damaged, will system halted when system boot. If resonant capacitance electric leakage, the clock will not be accurate.
3, Y1 crystal oscillator, if damaged, there is no response when press....read more
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