Steps to repair the mainboard that can’t be powered on

The mainboard cannot get the supply for lots of causes: Resulting from 32,768 KHz quartz die, SIO chip failure or chip, worse is the South chip. Information you the steps to restore the mainboard cannot get the supply. Notice that this illness is completely different from the illness that turns the fan energy for a number of turns after which turns off. You provide energy to the ability provide, plug the ability jack into the mainboard and proceed to restore in keeping with the next steps:

Examine how leap clear CMOS is ready. Usually pins 1 – 2 are regular, pins 2 – 3 are clear CMOS. When you depart the CMOS clear mode, it is not going to set off the supply (for some mainboards).
Ensure that the ability provide remains to be good: the purple pin should have 5V, the inexperienced pin to stimulate the supply should have 5v. The PS_ON pin on the mainboard panel have to be from 1.5v – 5v, shedding the voltage of the ps_on pin is not going to set off the supply. Often this voltage from the SIO chip to the small fet and capacitor close to the ps_on pin after which to the ps_on pin.
Proceed measure pin A 14 on PCI slot to see if there may be 3.3v. It is a earlier energy provide for the south bridge chip, this voltage loss is not going to activate the supply, often as a consequence of lifeless IC 1117 (LM 1117) or shorting the South chip. Establish pin A 14 by wanting on the left PCI slot because the lengthy slot, on the proper because the brief slot, the higher row, the primary pin is A 1.
Attempt touching the 2 legs of 32.768 KHz quartz along with your hand to see if the principle has an influence supply. Sure or no, you need to attempt quartz as a substitute.

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2. The mainboard remains to be being powered, you   proceed to the touch the SIO chip and the male chip to see which one is sizzling. If it is sizzling, change 90% of it and die. If it isn’t sizzling to the contact, we proceed to press to see if the male chip and the IO chip have any sizzling ones. Squeeze by utilizing tweezers to plug into the ability twine (inexperienced) and mass wire (black). Tweezers should conduct electrical energy, or you should use copper wire to attach. If none of them are sizzling, we proceed to comply with step 4.
   Take away the ability jack from the motherboard. Examine the ability pin on the male chip or the IO chip by adjusting the clock to the X1 ohm scale, 1 stick plugs into the P.ON pin (the inexperienced ATX pin) of the ability jack (often pin 14 of the 20 PIN jack) ), the opposite probe on the SIO chip. If the clock goes as much as the tip of the needle (as much as 0 ohms), it proves that the supply circuit is on the IO chip, we proceed to solder the pins or change the IO chip (70% of the illness can not set off the supply as a result of fault of the SIO chip). If there is no such thing as a connection, we proceed to measure.
   The supply circuit often has 3 kinds: straight into the SIO chip, straight into the South chip and the third type is the circuit by means of the inverting amplifier after which on the male chip (at the moment little or no use of this gentle). To seek out the inverting amplifier lamp, you modify the clock to the x1 ohm scale, 1 rod is positioned on the P.ON pin of the ATX energy jack, the opposite rod measures on the D pin the small mosfet lights, the realm close to the male chip. If the clock goes as much as 0 ohms, the circuit makes use of amplified lights. Attempt changing this lamp. If there is no such thing as a continuity (ie > 0 ohms). Then the supply circuit goes straight to the male chip.
   Extra about this supply textSource textual content required for extra translation info

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4. Proceed to steam once more  or change the male chip .Notice as a result of changing the male chip can be a bit sophisticated, so if the ability jack goes on to the male chip, you must also see the SIO chip first. There are additionally instances the place the machine doesn’t set off the supply, the supply circuit goes into the male chip. However as a substitute of the SIO chip, the supply might be activated (the SIO chip is accepted). And there may be additionally the other case. The supply circuit goes into the SIO chip however replaces the male chip to activate the supply.

   That is the sequence of steps to repair the mainboard cannot get the supply. You need to verify from simple to troublesome, lest you catch the mistaken illness and provides delivery to different illnesses as a consequence of improper manipulation.