How to Repair motherboard step by step

motherboard repair 

Motherboard Repairing Steps

First check motherboard for physical damage and burt break components .

If Motherboard Dead

Check Suspected Circuits Point to Point

1. VRM Supply Circuit
2. Cpu Core Volt Circuit
3. Any Power Shorting
4. Signal Shorting
5. I/O Ic Faulty
6. MCH Ic Short (Memory control Hub)
7. PIIX Short

Repairing Method and Steps

Step 1

Check VRM Circuit All Components Such as:-

• Main Mosfet.
• Supporting Mosfet.
• Filter Capacitor .
• And VRM IC. 
• Short or OPen condition Any Component first Remove Component From Motherboard PCB with help of SMD Machine .And Check Shorting or Open with Multimeter.

Step 2

• Check CPU Core Volts Circuit.
• Check All Capacitor After output Coils terminals any one and more capacitor are short or open. 
• replace all Capacitor.
• If computer hang in Bios that mean output Coils are short Replace Coils .

Step 3

Any Power Path Short

• Trace all Power 3.3v, +5v, -5v, +12v, -12v - Volts Path any one path are shorting . check also power path Parallel Components (Capacitor, Diode etc.)

Note : shorting Conditions => volts and volts shorting, volts and Ground shorting check both conditions

Step 4

• Signal Path Shorting
• If any Data and Address Signal short then Display not come in Motherboard. so also check all Bus path Cpu To all Main Ic Circuit Such As=> Memory Controller Data Path, Clock Generator Data and Address Path, MCH, PIIX, Sound IC, Lan Ic, Chipset Ic etc
• Check All Parallel Components-capacitor, Resistor, diode, coils etc.
• Replace all Bad Components.

Step 5

• Input Output Ic Faulty.
• If Motherboard doesn't on by Trigger then check I/O Ic .
• First Check +5v operating volts,if volts not come check supply path and components.
• If volts available in Ic then Check high SMPS Green Cable Path. 
• First desolder all ic's pin for dry soldering .
• Last  Option replace the Ic .

Step 6

MCH And PIIX Chip Shorting.

• First check Chip Overheating If Chip Are Overheat that Means Chips Are short And Non Repairabale 
• check operating volt and  mosfet and other connected components 
• 
  

Coming Soon All Other Circuit Repairing Tips Please Visit Regularly and Ask Some Faults related question .