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What is Diagnostic Card, Types, Uses, error Codes, Details

What is Diagnostic Card, Types, Uses, Codes, Details

What is Diagnostic Card, Types, Uses, Codes, Details

What is Diagnostic Card?

It is also known as Debug,POST,PC analyzer and Computer Tester Card. We Use Diagnostic Card to Find the problems in Motherboard. It reads the code from Bios During Computer Starting. It shows code in Hexadecimal Number System. 

Diagnostic Card is a powerful tool for technicians to troubleshoot problems of PC Motherboards. It is very easy to install, Just you have plug it into PCI Slot. If you have a Diagnostic Card, you no longer have to go through tedious and time consuming process of trying to figure out what is wrong with your Computer Hardware. Diagnostic Card will tell you exactly what’s wrong with your Motherboard in just seconds with some Signals. It saves you time and money.


The Diagnostic Card itself only requires an empty PCI slot. We don’t need to install memory chips to perform analysis. It is easy to use, Just plug into PCI slot “POST Codes” will be displayed through the hexadecimal display panel on the Diagnostic Card itself.  

Type Of Diagnostic Card

There are 4 types of a Diagnostic Card

1. 2 Digits Diagnostic Card

2. 4 Digits Diagnostic Card

3. TFT/LCD Diagnostic Card

4. Latest PCI and PCi E (Express) Diagnostic Card

2 Digits Diagnostic Card

Features:It is easy to install, just plug into the PCI interface.
Intercept and hex the code of your booting computer.
Hexadecimal character display.
4 LED indicator.
Detailed & precise LED function table and code Indication table, convenient for you consulting.
Compliant to the AMI, Award, PHONENIX BIOS.

Specifications:system: Windows 98/ ME/ 2000/ XP / VISTA/ 7/ 8/ 10


4 Digits Diagnostic Card

Diagnostic Card error Codes

Code Discription
CLK Motherboard Clock Signal. Should be on when power is supplied to the motherboard even without CPU.
IRDY Device Ready. Flashes when an IRDY signal is detected.
BIOS BIOS Read Signal. Flashes when CPU reads BIOS code.
OSC ISA Oscillation Indicator. Indicate ISA Oscillation Signal is available.
FRAME PCI Bus Frame. Should be on under normal circumstances and flashes when a PCI Frame Signal is detected.
SYS Bus pulse. If the LED blinks, the main board bus is running. If the bus is not running, the LED is off.
DATA Data Transfer. This signal shows that a device has been selected for data transfer. If no blink, the bus controller could be faulty.
IOW I/O Write. Lights when the BIOS writes to device and provides the same troubleshooting clues as the I/O READ.
12V Power Supply, 12-Volt Positive. Should be on all the time otherwise there is a short circuit.
-12V Power Supply, 12-Volt Negative. Should be on all the time otherwise there is a short circuit.
5V Power Supply, 5-Volt Positive. Should be on all the time otherwise there is a short circuit.
-5V Power Supply, 5-Volt Negative. Should be on all the time otherwise there is a short circuit.
3V3 Power Supply, 3.3-Volt. Some motherboards have 3.3V power supply to PCI slots. This indicator should be on if the motherboard supplies 3.3V power.

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