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repair mainboard:

Step by step to repair mainboard:

Step 1: Power button:

If there is power step 2, otherwise check power supply circuit , including: stand by 3v3 , chip SiO, Southbridge.

Standby 3V3:
- 5v standby voltage from ATX will lower down to 3v3 for the southbridge, often using an ic 1117 or 1084, 1085, 1086 (pin 3; input ATX STB 5V, pin 2; output 3v3 STB. The main life bulbs are not used IC which uses a circuit with few or MOSFET transistor to stabilize pressure.).
- Check 3V3 at A14 pin PCI slot (see picture).



See PCI pinout in pinouts.ru

http://pinouts.ru/Slots/PCI_pinout.shtml



The cause of death 3v3 stand by this:

- Death ic 1117/1084/1085/1086

- Died LAN, Sound onboard

- Death southbridge

Chip SIO & Southbridge:

- 3v3 STB Otherwise, continue with chip SiO.

- Circuit power is booted, there are three following types (see picture):



Type 1: PWR button from the southbridge, ATX ps_on to MOSFET (polarity reversal) and the chip SiO.



Type 2: no MOSFET, ATX po_on go directly to SiO.



Type 3: PWR button on SiO.

PWR button (ps-on/pw on in F_Panel):



If the circuit well, southbridge activities, PWR button to have 2v5 ~ 5V. If lost, check SiO, Southbridge. If a volte PWR button, click the source is not, check Mosfet (polarity reversal), South Bridge chip, chip SiO.

Note: Quartz 32.768Khz southbridge bug will not work.