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Hello everyone, in this lesson we will take a look at the troubleshooting of non-recognized card faults

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The failure to recognize the card means that the graphics card device cannot be found in the device manager

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Unrecognized card faults are generally caused by GPU working conditions not being met,

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or abnormal PCIE 1X data lines, or GPU damage

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We said before the working conditions of the GPU

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When the working conditions of the GPU are all satisfied and the PCIE 1X data line is normal,

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the card will be recognized

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If the working conditions are met but the card is not recognized, the GPU is broken

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Let's take a look at its maintenance process

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For the card not recognized fault,

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we first need to measure the gold finger 1X data line to see if its ground value is normal

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If the ground value of the data line is infinite, it means that the GPU may be soldered or damaged.

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If the ground value of any data line is 0, then the GPU must be damaged

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If the ground value of any data line is 0, then the GPU must be damaged

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If there is no power supply generated, then the card will not be recognized.

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After the power supply is normal, let's measure the clock

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The clock refers to the 27M crystal oscillator around the GPU

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We need to use the voltage file of the multimeter to measure

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whether there is voltage on the two clock output pins of the crystal oscillator

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If there is voltage, it generally means that the vibration has started.

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If the power supply is normal, but the crystal oscillator does not vibrate,

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then generally the GPU is broken or the crystal oscillator is broken.

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Then we go to test the reset signal, which needs to be connected to the motherboard to measure it.

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In actual maintenance, it is often encountered that the card is not recognized

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because the reset signal is not sent to the GPU.

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If the power supply, clock, and reset signals are all satisfied,

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we can only measure whether to read the BIOS

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Try to refresh the BIOS, or add soldering GPU to try to solve the problem