Motherboard detection card

Motherboard detection card

1. Tool Introduction

The motherboard diagnostic card converts the detection process of the BIOS internal self-check program into code when the motherboard is started. It reads the code displayed on the card and compares it with the fault code table, you can quickly diagnose or locate faults in the main board, memory, CPU, power supply, and other related components.

2. Applicability

Suitable for qdi, gigabyte, Microstar and other manufacturers with ISA or PCI slot motherboard, can diagnose machine self-check (from power-on START, system self-check to display normal) problems encountered.

3. Features(For detailed code and indicator light status, see the diagnostic card instruction)

1) Common Code

Code	Description	Remarks
00 or FF	After running a series of code, if the code 00 or FF appears, the motherboard is OK.	Due to the differences between the motherboard design and chipset, some of the motherboard may display code 23, 25, and 26 after self-check, which is normal.
	A fixed Code (for example, 00 or ff) is displayed when the server is started, without any changes. Generally, the motherboard or CPU is not running properly.
CO	Initialize Cache	Motherboard or CPU failure
C1 or C6	Memory self-check	This code will trigger an alarm when the speaker crashes, and some motherboard displays A7
31	Display storage read/write test or scan detection failed	If the display on the motherboard is partially or the video card is faulty, an alarm is triggered on the speaker.
41	Initialize a floppy drive controller	Motherboard BIOS Problems

 

2) led status

Lamp name	Signal name	Description
CLK	Bus clock	No matter whether ISA or PCI has an empty board (no CPU required), the power should be on; otherwise, the clock signal will be bad.
Bios	Basic Input and Output	Flashing occurs when the motherboard runs a read operation on the BIOS.
Irdy	Master device ready	Flashing only when irdy signal exists, otherwise it will not light up
OSC	Oscillation	There is a main vibration signal of the ISA slot, and the blank board should be normally energized; otherwise, the vibration will be stopped.
Frame	Frame Period	When there is a cyclic frame signal in the PCIe slot, the light is flashing and usually on.
RET	Reset	It is normal to enable the device temporarily or press the reset button for half a second. If the device is on normally, the reset circuit, reset button, or the pin connection is incorrect.
± 12 V	Power Supply	The power on the blank board should always be on; otherwise, the voltage output or the motherboard may be short-circuited.
± 5 V	Power Supply	The power on the blank board should always be on; otherwise, the voltage output or the motherboard may be short-circuited.
3.3 V	Power Supply	The power on the blank board should always be on; otherwise, the voltage output or the motherboard may be short-circuited.

4. Procedure

When no obvious fault occurs during the self-check process when the machine is powered on (for example, the self-check hardware fails, the horn alarm,

The display cannot be normally displayed)

1) First, disconnect the power supply, and use the observation method to check the appearance of each part of the machine, whether there are obvious bad appearance and burning marks;

2) If no exception is found, use the minimum hardware system method to insert the diagnosis card of the motherboard into the ISA or PCI slot (for example, if the motherboard has an ISA slot, we recommend that you select the ISA slot first; if there is no ISA slot, then select the PCI slot. When you select a PCIe slot, it is best to be close to the intermediate slot. Because the card has compatibility problems with a small number of boards, "00" may not be displayed when you use the first or last PCIe slot ), connect the speaker to the speaker socket on the motherboard;

3) power on and start the minimum system. Observe the codes displayed on the two luminous tubes in the upper left corner of the motherboard diagnostic card, and check the fault code table to confirm the fault. At this time, the fault can also be determined by the indicator light status and speaker sound;

4) if no problem is found in the minimum system, add other devices one by one, observe the Code displayed on the diagnosis card, and find the fault.

5. Notes

1) in the minimum system, some faults may have duplicate codes (for example, "oo", "C0", and "C1" Code), which may lead to failure to locate a component. In this case, it is recommended that the replacement method be used for further confirmation to separate faulty parts;

2) due to compatibility issues, the first or last PCIe slot may occur (a small number of qdi 810, 694x chipset boards), causing the system to be invisible, the code is "oo", so it is best to use the pci in the middle when using the diagnostic card;

3) because of the differences in the design and bios of each motherboard, the displayed code is slightly different. In addition, some code (for example, "A7", usually the motherboard memory slot or memory module failure) it may not be described in the Manual. Please note the summary of special cases;

4) When a fault occurs after the display is properly displayed, the diagnosis card basically no longer works. Handle the fault according to the display. The diagnosis card code is for reference only;

5) when the diagnostic card is inserted in the ISA slot, place the diagnostic card with a component toward the power interface of the motherboard. If it is reversed, the system will not work and parts may be damaged.

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Motherboard detection card