Hello guys ! When the pc mainboard cannot be powered on, it’s a must to test the facility provide once more, test if the clear CMOS soar is appropriate? Exchange 32.768 KHz quartz. Examine to see if the supply circuit is in any type, within the South chip, within the ISO and if there’s an inverting amplifier gentle…. You’ll be able to consult with the article: The steps to repair the mainboard cannot hit the supply that I discussed. Nevertheless, many occasions we’ve got executed all these steps however nonetheless cannot activate the supply
I want to share with you my expertise of fixing Asus mainboard that can’t be activated, which I’ve executed efficiently. When we’ve got executed easy steps corresponding to changing the quartz, checking the CMOS soar and measuring, we all know the supply circuit goes to the SIO chip. I made the next measurements:
Examine the RTC circuit: There’s an OK voltage supply.
3.3v energy provide for the Southbridge chip: Okay, will be measured on the A14 pin of the PCI slot or measured close to a number of young children subsequent to the South chip.
The facility twine (inexperienced) on the 20 or 24 PIN energy jack connects to pin 72 of the IO chip: Good.
Pin 68 of IO when the supply is just not activated has 3.3v. When conducting the supply, the pin 68 loses voltage >> OK. Some Aus Mainboards don’t design energy jacks on to the IO chip, however by the youngsters, so don’t measure immediately.
Pin 61 SIO (supply earlier than 3VSB) has 3.3V: Ample energy.
Pin 75 SIO (RSMRST) has 3.3V : Good
Pin 73 SIO (SLP_S3) has solely 0.8V : Undervoltage. Pin 73 of the IO will need to have a regular voltage of three.3v. That is the reason for the mainboard not with the ability to energy. Pin 73 receives the SLP_S3 command from the male chip, so the error could also be brought on by the male chip or IO.
If we proceed to get rid of it by making an attempt to switch the SIO chip or the South chip, it’s too time consuming and costly. To be quick and economical, we simply want to attach pin 61 ( 3VSB ) to pin 73 to faux the command. And consequently, the mainboard was powered on and booted up usually.
This fashion I’ve efficiently executed on Asus P5G41T – MLX mainboard utilizing Winbond W83627DHG-A IO chip, Asus P5GC-MX/1333 mainboard utilizing W83627EHG IO. And a few Asrock mainboards use IO chips as above. Wishing you success
