3V AND 5V SECTION (ALWAYS VOLTAGE)
This is second section in laptop motherboard called 3v and 5v section.
This section receives adapter voltage and generate 3v to get power to SIO. This section also called ALWAYS VOLTAGE SECTION.
It has two buck convertors 3.3v and 5v and two linear regulators VREG3 AND VREG5.
If this section failed, the laptop cannot TURNON.
NO SIGNAL DESCRIPTION
1 VIN INPUT SUPPLY TO CHIP AND MOSFET
2 VREG3(LDO3) LINEAR 3 VOLT OUTPUT
3 VREG5(LDO5) LINEAR 5 VOLT OUTPUT
4 UG & LG UG= UPPER MOSFET TRIGGERING
LG= LOWER MOSFET TRIGGERING
5 3ON(EN), 5ON(EN) INPUT TO 3V AND 5V ENABLE SIGNAL
6 3V ALW 3.3V ALWAYS VOLTAGE OUTPUT
5V ALW 5V ALWAYS VOLTAGE OUTPUT
7 PGOOD POWER GOOD CONFIRMATION SIGNAL POWER OK
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