Mainboard detection card common code repair

Mainboard detection card common code repair

Show FF or 00, CPU is not working ATX power is damaged
CPU pin solder joints due to long-term thermal expansion and contraction, off-weld
Electrolytic Capacitor burst near CPU
Power Transistor near CPU burned out

Code: FF, 00, C0, D0, CF, F1, or nothing indicates CPU failure
C1, C6, C3, D3, D4, D6, D8, B0, A7, and E1 indicate that the memory is insufficient.
24, 25, 26, 01, 0a, 0b, 2a, 2b, 31 indicates that the video card is not
Some integrated graphics card boards 23, 24, and 25 can be properly lit, some via chipset display 13 can be lit, and some brands of the motherboard display 0 B is normal, some motherboard display 4E indicates normal light, some intel chipset motherboard display 26 or 16 indicates normal light.
C1, C6, C3, 01, 02 is the combination of cycle hops. Most of the changes are I/0 bad or BIOS refreshing.
If 05, Ed, and 41 are displayed, the BIOS is directly refreshed.



1. Various indicators on the motherboard detection card

BiOS light: enables flashing of BIOS lights during normal operation.

CLK lamp: The Clock lamp is always on.

OSC lamp: The Clock lamp is always on when it is set to a benchmark.

Reset light: to reset the light, to boot normally, flash instantly, and then off

Run light: To run the light, should not stop flashing

+ 12 V,-12 V, + 5 V, + 3.3v lights are normally on
Ii. Common Code Maintenance

1. 00, CO, CF, FF, or D1

Whether the BIOS chip CS is selected:

(1) chip selection: BIOS change, bios oe test, PCI ad line test, CPU reset with 1.5 V -- 0 V hop change

(2) No-chip selection: frame for PCI testing and dbsy ads for CPU testing #. If the frame cycle signal is abnormal, the North Bridge is bad. If the frame cycle signal is abnormal, the South Bridge is bad.

2. C0

Dirty CPU slots, bad pins, and poor contact

Changing the power supply, CPU, and adapter can sometimes solve the problem.

Brush bios and check BIOS seat

I/O bad, North Bridge virtual welding, South weak bridge bad

PCB disconnection and conductive material attached to the Board

3. C1, C3, C6, A7, or E1

Poor memory contact (use tweezers to draw memory slots)

Tested memory operating voltages: SDRAM (3.3 V), DDR (2.5 V and 1.25 V)

Test clock (clk0 ~ Clk3)

CPU side exclusion is damaged

Test the CPU address line and data line

Test DDR load and data exclusion

Bad North Bridge

4. C1 ~ 05 cyclic jump

Test whether 32.768mhz is normal

BiOS corruption

I/O or South Bridge damaged

5. C1, C3, and C6

Brush bios and check BIOS seat

Changing the power supply, CPU, and adapter can sometimes solve the problem

PCB disconnection and conductive material attached to the Board

Memory switch, pc100, pc100, or faster and more stable memory

For memory slots, some motherboard memory slots must be inserted to the inside or outside of the slot to work.

Visual inspection of mechanical damage such as short circuit in memory slot

No memory clk0, clk1, clk2, clk3, clk4, memory master Power Supply

Check whether there is an open circuit Phenomenon

I/O chip, North Bridge virtual welding, or North Bridge bad

6. loop display C1-C3 or C1-C5

Brush BIOS

Changing I/O sometimes solves the problem and checks the I/O peripheral circuit.

PCB disconnection and conductive material attached to the Board

Power change, CPU change, memory change

Nanqiao bad

7. Other code

Brush BIOS

Power change, CPU, memory

Check the I/O peripheral circuit and change the I/O Chip

PCB disconnection, board adhesion with conductive material, south bridge bad

8. Bo code

Tested memory data load voltage: 1.25 V, 2.5 V (DDR)

Clear CMOS

Test Power Supply of the North Bridge or damage of the North Bridge

9. 25 Code

Test the power supply of the AGP core: 4X (1.5 V), 8x (0.8 V), 2x (3.3 V)

North Bridge power supply, North Bridge bad

10. Not bright after OD

Measure the resistance and exclusion between PCI slots.

Outer frequency, multiplier jumper

11. If ob display is not on

Change the video card. Sometimes the motherboard is not compatible with the video card.

Power change, CPU change, memory change

Card slots, PCB disconnection, and conductive material attached to the Board

Brush BIOS

Change I/O

Check the power supply of the North Bridge or the South-North Bridge

Check the exclusion and capacitance near PCI and AGP slots.

12. Display 2D code

Test the ad line of AGP

Initialize intr Signal

North Bridge power supply is abnormal or North Bridge is bad

13. remain unchanged after 2D code is displayed

Brush BIOS

Poor clock generator

Clear CMOS

North Bridge power supply is abnormal or North Bridge is bad

14. Show 50 codes

I/O power supply or I/O chip is broken

South Bridge power supply or south bridge bad

Bad bios and bad Northbridge

15. Display 41

Brush BIOS

A18 jumper

PCB disconnection and conductive material attached to the Board

I/O bad, south bridge bad

Error code: 00 (FF)
Code Description: The motherboard does not have a normal self-check
Solution: This fault is troublesome because the motherboard or CPU is not working properly. In this case, you can first remove all the components except the CPU on the computer, and check whether the voltage, frequency doubling, and external frequency settings of the motherboard are correct, and then discharge the CMOs, restart the system to check whether the fault is rectified. If the fault persists, you can also remove the CPU from the socket on the motherboard, carefully clean the dust on the socket and its surroundings, and then install the CPU properly and put some pressure on it, ensure that the CPU is in close contact with the socket, install the heat sink properly, and then start the test. If the fault persists, we recommend that you replace the CPU test. In addition, the motherboard BIOS damage can also cause this phenomenon, if necessary, you can refresh the motherboard BIOS and try again.

Error code: 01
Code Description: processor Test
Solution: the CPU itself has not passed the test. Check the CPU related devices. If the CPU is too frequently, restore the CPU frequency to the default frequency, and check whether the CPU voltage, external frequency, and frequency doubling are set correctly. If all normal faults remain, you can change the CPU and try again.

Error code: C1 to C5
Code Description: Memory self-check
Solution: it is a common fault. It generally indicates that memory in the system is faulty. To solve such faults, You can first perform dust removal and cleaning on the memory before testing. If the problem persists, try to use a soft eraser to clean the golden finger until the golden finger returns the metallic luster and then clear the debris in the memory slot, check whether the metal shrapnel in the memory tank is deformed, broken or oxidized and rusted. If the fault persists after the boot test, you can change the memory and try again. If you have multiple memories, you can use the replacement method to find the fault.

Error code: 0d
Code Description: video channel Test
Solution: this is also a common fault. It generally indicates that the video card fails to be detected. At this time, check whether the connection between the video card and the motherboard is normal. If any phenomenon such as loose of the video card is found, promptly re-insert it into the slot. If there is no problem with the contact between the video card and the motherboard, you can clear the dust on the video card, clean the golden finger part of the video card, and then insert it to the motherboard for testing. If the fault persists, you can change the video card for testing.
Generally, after the system starts 0d, the display signal has been transmitted to the monitor. At this time, the monitor indicator turns green, and then the Debug Card continues to jump to 31. The Monitor starts to display the self-check information, in this case, the computer fault can be determined by the information on the monitor.
Error code: 0d to 0f
Code Description: CMOS stop register read/write Test
Solution: Check the CMOS chip, battery, and peripheral circuit. You can replace the CMOS battery first, and then dipped a small cotton ball into the anhydrous alcohol to clean the CMOS pins and circuit parts, then check whether the problem is resolved during the Boot Check.
Error Codes: 12, 13, 2B, 2c, 2d, 2e, 2f, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, and 3A
Code Description: test the video card
Solution: This fault is common in the AMI bios. You can check whether the video interface circuit, main chip, and video memory of the video card cannot work due to excessive dust, if necessary, you can change the video card to check whether the fault is resolved.

Error code: 1A, 1B, 20, 21, 22
Code Description: Memory Test
Solution: Same as the solution to memory faults in Award bios.

Note: if an error is not displayed in the BIOS settings, the diagnosis card will not stop when a non-fatal fault occurs, the solution is to enable the system after prompting all errors in the BIOS settings, and then start the system based on the debug code.

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