La-c811p Boardview [DIRECT]

Step 2 – Check PCH power: Search PU301 . The boardview shows its output net +1.0V_PCH . Locate test point TP301 near the PCH. Measure voltage – if missing, PU301 or its enable signal is faulty.

Step 1 – Check GPU power: Open boardview, search PL501 (GPU power inductor). It shows that PL501 is connected to net +VCC_GFXCORE . Click on net – boardview highlights PL501, PC501-PC503, and PU501. Measure resistance to ground at PL501. If short (e.g., 0.2 ohms), suspect failed GPU. la-c811p boardview

Step 3 – Trace enable signal: Find pin 4 (EN) of PU301 on the boardview. It shows that EN comes from net PCH_EN driven by the SIO (MEC1416). Search MEC1416 – boardview jumps to the EC. You can now visually trace (using the layer view) if the trace is physically damaged. Step 2 – Check PCH power: Search PU301

| Area | Key Components | Common Failure | |------|----------------|----------------| | | PU601 (MP2949A), PC618-PC628 (ceramic caps), PL601-PL604 (power chokes) | No CPU core voltage; dead CPU | | GPU Power | PU501 (MP2888A), PC501-PC515, PL501-PL503 | No display; GPU coil short to ground | | PCH (Platform Controller Hub) | PU301 (1.0V PCH supply), PC301-PC310 | No power on; USB/Camera failure | | Charging IC | PU401 (BQ24780S) | Not charging; battery not detected | | SIO (EC) | MEC1416 (I/O controller) | Power sequencing failure; fans at 100% | | DDR4 Memory | PU701 (VDDQ), PU702 (VPP) | RAM not detected; blue screen | Measure voltage – if missing, PU301 or its