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In this lesson, let's take a look at the maintenance process that the digital interface does not display

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The first step is to observe whether there is any appearance failure near the interface,

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such as interface corrosion, damage, or deformation.

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Furthermore, observe whether there are any appearance faults on the motherboard,

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such as water ingress, corrosion, disconnection, etc.

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No matter what the fault is, the first step in maintenance is always to check

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whether there is any problem with the appearance

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There are a lot of damage to the graphics card that can be seen on the outside.

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After checking the appearance, we check whether the power supply pin of the interface is powered

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Next, plug in the monitor and check whether the HPD signal will be pulled to a high level,

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and whether the GPU has received the HPD signal

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After receiving the HPD signal, we measure whether the ground value of the screen reading signal line is normal

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Then measure all the clock lines, data lines,

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and whether the ground value of their coupling capacitor GPU side is normal

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After the ground value is normal, use the oscilloscope again to measure

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whether there is a waveform in the instantaneous screen reading signal inserted into the display screen

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After confirming that there is a waveform, it means that the GPU has started to read the screen

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If it still does not display after reading the screen,

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and the coupling capacitance of the data clock line to ground is normal, then the GPU is generally damaged.

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GPU may need to be replaced