The next step is to verify the standby power rails. These are often the first to fail. On the LA-C701P, the PU2 ( RT8243AZQW ) generates the 3.3V and 5V rails.
: Patching could be necessary for several reasons. Sometimes, the original design might have flaws or areas that can be improved upon. In other cases, components might become obsolete, and a patch would update the design to use a different part.
Before applying voltage to any rail, use a digital multimeter in resistance/diode mode relative to ground. Note down low resistance values; CPU and GPU rails inherently have very low resistance (often below 10 Ohms), which should not be confused with a dead short circuit. lac701p rev 10 boardview patched
The "patch" is the bridge between a confusing, incomplete data file and a successful repair. It allows for the identification of "blind" shorts—components hidden under shields or on the opposite side of the board—that would be impossible to find through visual inspection alone. Conclusion LAC701P Rev 1.0 patched boardview
I can provide step-by-step instructions on to help you find the short circuit safely. LA-C701P Boardview and Schematic | PDF - Scribd The next step is to verify the standby power rails
Find a corroded pad under a microscope. Click that pad in your patched boardview to see where the trace is supposed to go. Solder a micro-jumper wire from the component directly to its destination, bypassing the broken internal trace. How to Choose the Right Tools
Step-by-Step Diagnostic Workflow Using the Patched Boardview : Patching could be necessary for several reasons
The 3.3V and 5V standby regulators are known common failure points on this specific motherboard.
This dual-tool workflow is essential for:
: Before soldering a replacement component, use the boardview to confirm you have identified the correct footprint and orientation. Check pin counts, pad layouts, and adjacent component spacing.
A corrupted BIOS is another common culprit. You can check the BIOS SPI flash chip (usually an 8-pin chip near the KBC) using a multimeter to verify basic connections. The final step would be to use a programmer to flash a verified, known-good BIOS dump for this exact motherboard model.