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Common Causes of No Power?
1. Faulty DCIN section :
Missing CSR Voltage or Drop Voltage.
2. Shorted 19Volt Rail or Main Rail
Due to shorting in input Capacitor or Upper Mosfet of one of the Power supply in the Motherboard.
3. Shorted RTC VCC
Due to shorted Dual diode input of +3VLP and CMOS Battery.
4. Faulty PCH Power_Managment
Due to Corrupted RTC powered Memory inside the PCH 256kb that handle power management.
5. Shorted Power Button builtin in keyboard.
6. Battery BATLOW# Asserted signal,
Remove battery and BATLOW# Deassert, laptop will turnon.
7. Missing ACDET signal.
New model of laptop generation most often ADAP_ID goes HI ang turn on Mosfet ang Groundedbrhe ACDET Signal.
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