Common Computer checkboard code

 

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
Test whether the BIOS chip CS has been selected: I
(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.
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 I

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
12. Display 2D code
Test the ad line of AGP
Initialize intr Signal
The power supply of the North Bridge is abnormal or the North Bridge is broken.
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