求指教

3V,5V對地短路維修方向
1. 目檢:Chipset(Southbridge, Northbridge, I/O chip, GD75232, Sound chip), AC97, PWM... 是否有燒毀, USB, P/S2 Connector,PCIslot,AGP slot,ISA slot, CNR Slot, Chipset…是否有撞壞造成短路.
2. 觸摸:打開電源觸摸 Chipset 是否有發燙.
3. 電源不打開時,用電表檢測那組電源短路,再決定移除短路電源有連接相關晶片,PWM,電阻電容..
4. Main chip 南北橋,I/O Chip, Soundchip, AC97, PWM…都移除短路沒解開,建議換板.
*.注意: 3V&5V短路維修方法 Chipset 移除至短路解開再焊,不能移除一顆換上顆,有可能換上新 Chipset 因短路電源沒解開, Turn on power chipsetbrunt out.