RT9173 SOP-8 Regulator concept
As per the image shown of regulator.
VIN pis is for power input.
GND pin is for ground.
VCNTL pin is for gate drive voltage.If gate drive voltage is increased,then out put voltage will increase.
REFREN is s reference voltage and chip Enable voltage.Enable voltage are required to activate the chip.If all voltages are received but enable voltage is not there,then regulator chip will not function.
VOUT is output voltage.
Normally a regulator has three pins(legs)
There are two types of regulator semiconductor components.
Either P-type regulator or N-type regulator.
But for Sop-8 type Regulator,it has 8 legs(4 pins on each side).
These Sop-8 regulator cannot be identified visually.Because there are many other components that look like it.
But in Sop-8 package regulator the Pin no:2 is always ground.
So with these simple test you can easily identify SOP-8 package regulator on motherboard.
Mostly these components are on laptop motherboard then on desktop motherboard.
On desktop motherboard there are three leg regulator.
See the image below,that will let you know how the SOP-8 package regulator looks:-----
As per the image shown of regulator.
VIN pis is for power input.
GND pin is for ground.
VCNTL pin is for gate drive voltage.If gate drive voltage is increased,then out put voltage will increase.
REFREN is s reference voltage and chip Enable voltage.Enable voltage are required to activate the chip.If all voltages are received but enable voltage is not there,then regulator chip will not function.
VOUT is output voltage.
These details will help.
For more help related to motherboard troubleshooting,check the help links below:----
Troubleshoot Dead Motherboard
Troubleshooting NO Display
Problem on Motherboard
Troubleshooting CPU Overheating Problem on Motherboard
Desktop Motherboard Cpu Fan
Connector
No SMPS
Power Good on Super I/O Chip
MCH OR ICH Heating on Motherboard
Desktop Automatically Turns ON
Motherboard Immediately Restarts
MotherBoard Will Not Start With 4-Pin ATX power connected
PC Motherboard System Hangs Or Very Slow
Colors Missing On Display
USB Port not working on Motherboard
Motherboard USB Connector Pin details
PS2 Port Not Working On Motherboard
Motherboard HDD not getting Detected
Fix For BIOS Corrupt
DATE & TIME KEEPS RESETTING ON PC
Faulty RAM slot on Motherboard
Audio Fault on Motherboard
Ethernet LAN problem on Motherboard
Understanding Components Used On Your Motherboard
Motherboard will not Turn ON due to faulty ICH RTC
Understanding Power Trench DUAL Mosfet
http://technoanswers.blogspot.com/2012/11/understanding-power-trench-dual-mosfet.html
