Motherboard repair code

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, + 3.3 V 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

Jump

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

If the number is abnormal, the Southern bridge is broken.

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 32.768 MHz 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 the 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

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