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Hello everyone, in this lesson, let's take a look at the maintenance of the sound card without sound

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No sound from the sound card may be a software problem or a hardware problem

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We should follow the maintenance principle of soft first and then hard during maintenance,

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and first rule out problems caused by software.

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After excluding the software, we want to test whether all interfaces have no sound or a single interface has no sound

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If there is no sound from all interfaces, it means that the sound card is not working

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If the sound card does not work, we can repair it according to the process of not recognizing the card

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It's just that here we need to focus on checking the analog part of the sound card

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If there is no sound from a single interface,

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it is caused by a problem with the left and right channels of a single interface or the insertion detection

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We should measure the ground value of the left and right channels,

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and at the same time check whether the insertion detection signal is normal

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The insertion detection signal is generally floating

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When the interface is inserted, the insertion detection signal will be grounded

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After grounding, generally a series voltage divider circuit on the side of the sound card is grounded

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We can judge whether the device is plugged in by detecting the voltage change of the series voltage divider.

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If there is no sound on a single interface, we need to focus on checking whether the insertion detection is normal

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If all these are normal, then there may be a problem with the sound card or the interface.

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We can replace the sound card or interface to test

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Generally speaking, sound card failure is relatively easy to repair.