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    174. Brief description of failure to run code
    174. Brief description of failure to run code
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    1

    00:00:00,266 --> 00:00:04,033

    Hello everyone, in this lesson, let's take a look at the non-running code failure

    2

    00:00:04,500 --> 00:00:07,266

    Non-running code failure is also called non-self-test failure

    3

    00:00:07,800 --> 00:00:12,166

    After the mainboard meets the conditions of power supply, clock and reset signals,

    4

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    it will read the BIOS and start self-test

    5

    00:00:15,133 --> 00:00:18,166

    During the self-test, if you plug in the diagnostic card,

    6

    00:00:18,300 --> 00:00:22,133

    you will see that the code on the diagnostic card is constantly changing

    7

    00:00:22,700 --> 00:00:24,966

    This is called running code

    8

    00:00:25,666 --> 00:00:28,566

    For a normal mainboard, after pressing the power button,

    9

    00:00:28,766 --> 00:00:32,766

    you can see that the code on the diagnostic card is constantly changing

    10

    00:00:33,000 --> 00:00:34,533

    This is running code

    11

    00:00:35,266 --> 00:00:37,933

    Not running the code is not self-inspection

    12

    00:00:38,266 --> 00:00:41,600

    The fault phenomenon is that after pressing the switch, the fan turns,

    13

    00:00:41,666 --> 00:00:47,033

    but the code on the diagnostic card is always 00, or FF, or the horizontal bar

    14

    00:00:48,600 --> 00:00:51,500

    It's a fixed code, no changes

    15

    00:00:52,866 --> 00:00:55,200

    This is a board that does not run code

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    00:00:55,466 --> 00:01:02,333

    We press the switch, we can see that it only shows 00 on the diagnostic card, no further changes

    17

    00:01:03,166 --> 00:01:07,333

    The non-running code failure is mainly caused by the mainboard

    18

    00:01:07,466 --> 00:01:11,200

    It may be caused by the unsatisfactory working conditions of the CPU or PCH

    19

    00:01:11,900 --> 00:01:18,300

    The working conditions of the CPU and PCH involve the power-on of the mainboard, the PG and the reset part

    20

    00:01:18,800 --> 00:01:22,500

    If you want to repair the non-running code fault,

    21

    00:01:23,000 --> 00:01:29,433

    we must first have an understanding of the main board's power-on, PG, and reset circuits.

    22

    00:01:29,933 --> 00:01:36,166

    In the next course, we will take a look at the power-on, PG, and reset circuits of the mainboard.

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