mainboard troubleshooting – component failure analysis

• To determine what would happen in a circuit if a component fails, re-draw that circuit with the equivalent resistance of the failed component in place and re-calculate all values.
• The ability to intuitively determine what will happen to a circuit with any given component fault is a crucial skill for any electronics troubleshooter to develop. The best way to learn is to experiment with circuit calculations and real-life circuits, paying close attention to what changes with a fault, what remains the same, and why!
• A shorted component is one whose resistance has dramatically decreased.
• An open component is one whose resistance has dramatically increased. For the record, resistors tend to fail open more often than fail shorted, and they almost never fail unless physically or electrically overstressed (physically abused or overheated).
• all in all, the easy way out will be replacing the mainboard once and for all to get your issue resolved but by doing so, you are creating more waste and not being environmentally friendly.

this link provide more details on what to expect from troubleshooting your hardware:

https://www.allaboutcircuits.com/textbook/direct-current/chpt-5/component-failure-analysis/