Firstly the use of PCI Express port is to diagnose desktop motherboards. Secondly, PCI ports come in 4 sizes 1x, 2x, 3x, and 4x. We are going to see PCI Port and Debug Card in detail
Signal Names And Their Description For PCI Express Port
The following is the signal’s name and description for the PCI express port.
3VSB (3V Stand By Signal )
3volt standby signal which comes before the power on button. If 3 volt here means SIO got 3 volt standby voltage.
3Volt VCC
It is a 3 Volt VCC voltage that comes after power on the desktop motherboard.
12Volt
After powering on the desktop motherboard 12volt voltage comes.
RESET
When all voltages including the CPU core OK then PCH generates 3 volts. Secondly, this signal is also called PLTRST ( Platform Reset).
CLOCK
Here we get clock frequency means the clock section ok.
SM Bus
This is the two wire communication protocol called SMBUS.
PCIE WAKE
If this PCIE WAKE generates 3 volt signal. This signal means the device is ready.
KQCPET6 Debug Card
KQCPET6 debug card has the following parts:
Check Switch
2digit code check switch is present there.
5 Pin Connector
Also, there is a present EC Wire 5 min connector.
Extension Socket
An extension cable socket is present there. Moreover, it connects the master card with T-Card or MiniPCIe adapter card.
USB Power Connector
There is also a USB power connector present. Secondly, it is used to connect to USB for power when using LPC or MiniPCIE connections.
Code Display
Firstly, It is also called BIOS and Qiguan display. It is moreover Qiguan 2 digit open code display and BIOS code.
What is the meaning of Debug Card LED
Below are the signals for which meanings are given for debug card LED.
| LED Light | Signal Type | Description |
|---|---|---|
| AUX3V | 3 Volt VSB | LED should be lighted on after SMPS gets power and this 3 volt is given to SIO and PCH which is called standby voltage. |
| 12V | SMPS 12 Volt | SMPS 12 volt power |
| -12V | SMPS -12 Volt | SMPS -12 volt power |
| RST | RESET | This LED would glow for a fraction of a second and then turn off. This indicates all motherboard chips got proper power. |
| CLK | Main Clock | This LED lights ON when there is a Clock signal. |
| FRAME | Frame period | LED flashes when there is a cycling FRAME signal indicating BUS in process. |
| RUN | Run Status of CPU | As soon as the CPU works, this LED will be ON. |
| IRDY | Device Ready | PCI device is ready when this light is on. |
| RAM | Memory Error | LED will glow continuously indicating that RAM / desktop motherboard memory module or power fault. |
| CPU | CPU Error | LED steady ON of CPU indicates that the CPU did not pass the self test. |
| DISP | Video Card | LED will glow continuously indicating that the Video card / integrated motherboard GPU self test failed. |
| HDD/PCH | HDD/BRIDGE | LED will glow continuously indicating that Hard Drive / Bridges (North or South) / SATA / USB modules self test failed. |
| STABLE | Stanble System | LED will glow continuously indicating that The computer is stable, no error. |
| UNSTABLE | Unstable System | Computer motherboard is not stable, with potential faults. |
You can go for more details about how the working of desktop motherboard happens or you can also look for other laptop repairing tips and tricks for more different subject understanding.
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