: Provides high-resolution, interactive maps of phone motherboards where clicking a pin highlights all its connected points on the board.
| Symptom | Likely Cause (from schematic) | |-----------|--------------------------------| | No output | Blown fuse, open startup resistor, dead PWM IC | | Output too low | Failed optoisolator, bad TL431, defective output capacitor | | Overheating | Shorted output rectifier, insufficient gate drive to MOSFET | | Humming sound | High primary-side current – check transformer or snubber | estech+schematics+12+6+download+full