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  1. I

    Ask Toshiba Satellite C645-SP4140L, PSC00U-00XLM5. sound failure with built-in speaker

    The laptop turns on normally, when activating the sound with a video or music, the built-in speakers sound good for 1 to 2 minutes, then the sound decays until it turns off completely, that only happens with the built-in loud voices, because if I connect external headphones ; audio operates...
  2. I

    Ask Probook 6460b, It does not turn on

    I press the power button and the laptop does not turn on, but I press the internet button and the power led turns on for a few seconds and then turns off again. What can be causing this failure?
  3. I

    Ask DELL PP20L, mainboard that runs well off the DC charger but does not charge the battery.

    I have purchased a new battery, but when I plug it into the laptop, the operating system shows that it is not charging. Can you give me the circuit diagram of the charging system.
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