RAM Section Circuit Diagram and Its Problem Solution in Desktop Motherboard

RAM Section Circuit Diagram and Its Problem Solution in Desktop Motherboard

RAM section is providing the requirement voltage to RAM for working. It may be 1, 2, and 3 MOSFET. It is place near RAM Slot Mostly. 
1-SD RAM-3.3v 
2-DDR 1-2.5v 
3-DDR 2-1.8v 
4-DDR 3-1.5v 
5-DDR 4-1.2v

Ok Conditions

 Display Come
 Diagnostic Card Show 7878,2526,3535 2525,8080 with IRDY
    and Frame LED Blinking.

 Voltage Present On Ram slot Supply pins.

Faulty Condition

 No Display come
 Diagnostic Card Show Code C1C0,C5C6,A004,C100,FFA0
    D0D1 and D4

 No Voltage present on RAM Slot.

Main checking point:

 Check RAM Supply MOSFET
 Check RAM Supply Filter Capacitor, It may be Leakage.
 Check PWM IC Supply, Near Components and resold it. But 
    same condition then replaces PWM IC.
 If RAM Supply OK But shows C1C0, C5C6, A004, C100,
    FFA0 code, Check Terminate/Network/Package SMD Resistor,
    near RAM Slot.

 If All above ok but same condition .then reprogram the BIOS. 
    BIOS Program is corrupted.