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In this lesson we talk about the reasons for the failure to display

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If a mobile phone, we have determined that it can be turned on normally,

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but does not display

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Then what factors should we mainly consider?

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First, is there any problem with the screen?

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Is it because the screen is broken,

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since the screen is mainly responsible for displaying

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Second, if there is no problem with the screen,

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take a new screen to test the mainboard

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If it still does not display,

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it means that it is not the problem of the screen,

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it must be the problem of the mainboard

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Next, we need to learn the circuit principle and the maintenance method of the screen

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The reasons for not displaying are mainly the problem of the mainboard and the problem of the screen

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In the actual maintenance, for example,

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the screen is broken and it is broken like this

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And this screen has two-stage separation,

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then this screen must be damaged

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Some screens are corroded by water

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How to judge the general quality of this screen?

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First, the root of the screen cable is seriously corroded by water ingress

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Second, the screen is broken

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Of course, if the screen cable is broken, you don't have to think about it

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There must be a problem with the screen

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Third, by carefully observing the screen,

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we found that the inner screen burst,

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but the outer screen does not seem to have much problem

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Another is that the whole from the outer screen to the inner screen is obviously broken,

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so there must be something wrong with this kind of screen

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When there is no problem with the screen,

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the mainboard is very clean, no water corrosion, no deformation

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At this time, we generally do not consider the mainboard

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Well, this is how to judge the screen,

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from the appearance to see if the screen is damaged

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Ok, that's it for this lesson