Motherboard repair tips & tricks - Toshiba C850 laptop not charging, not turning on - a simple test
Table of Contents
How to Repair a Toshiba C850 Laptop Not Charging or Turning On:
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Identify the issue: If your Toshiba C850 laptop is not charging or turning on, it may be due to a faulty power input circuit.
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Disassemble the laptop: Remove the screws from the keyboard side to detach the keyboard and access the internal components, including the CPU and charging port.
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Check the main power rail: Use a multimeter to check the voltage on the main power rail. A reading of 0.9 volts indicates a problem.
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Diagnose the power input circuit: Locate the charging port, inductors, mosfets, and BQ chip on the motherboard to identify any issues such as shorted mosfets.
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Replace faulty components: If the second mosfet is shorted, replace it with a working one from a spare board to restore power flow.
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Test the motherboard: Reassemble the laptop and connect the charger to ensure the main power rail is receiving the correct voltage (19.8 volts).
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Power on the laptop: Press the power button to turn on the laptop and check for normal operation, including LED indicators and fan activity.
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Final checks: Ensure the battery is connected correctly and that the laptop is charging (indicated by an orange light).
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Reassemble the laptop: Put everything back together and test the laptop to confirm that the issue has been resolved.
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Maintenance tips: Keep an eye on the power input circuit components, such as mosfets, for any signs of damage or malfunction to prevent future issues.
By following these steps, you can successfully repair a Toshiba C850 laptop that is not charging or turning on due to issues with the power input circuit.