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Hot testing and cold testing are two essential diagnostic methods used in laptop motherboard repair. Here’s how they differ:
Cold Testing
- Method: Uses a multimeter in beep mode or diode range to check components without applying power.
- Purpose: Helps identify short circuits, faulty capacitors, resistors, MOSFETs, and ICs before powering the board.
- Safety: Ideal for beginners, as it prevents accidental damage to components.
- Common Issues Found: Open circuits, shorted components, and missing connections.
Hot Testing
- Method: Involves injecting current into the motherboard and measuring voltage levels using a multimeter.
- Purpose: Helps diagnose power-related issues, voltage drops, and faulty components under actual operating conditions.
- Risk: Requires caution, as incorrect testing can burn components.
- Common Issues Found: Voltage irregularities, overheating components, and unstable power delivery.
Which One to Use?
- Cold testing is recommended before powering the board to detect faults safely.
- Hot testing is used after cold testing to verify power flow and pinpoint deeper issues.
