About Diagnostic Card

About Diagnostic Card

Diagnostic Card is used to Finding the problem of Motherboard. It is read the code from BIOS during Computer Start. and Show Code in Hexadecimal Number System.It is also known as Debug/ POST/PC analyser and Computer Tester Card.

LED Status

CLK -Motherboard Clock Signal. Should be ON when power is supplied to the motherboard even without CPU.

BIOS- BIOS Read Signal. Flashes when CPU reads BIOS code.(optional)
IRDY -Device Ready. Flashes when an IRDY signal is detected..
FRAME- PCI Bus Frame. Should be on under normal circumstances and flashes when a PCI Frame Signal is detected. It is blinking if display ok.
RST- Reset. After power on or reset, this indicator should be on for a half
second and then turned off. CPU Status Ok
+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.

Type of Diagnostic Card

1-2 Digits

2-4 Digits

3-LCD Diagnostic card

Common Mostly Code of Diagnostic Card

1-Code: 00/FF/ - -

Problem Issue:

Ø Processor/VRM Section

Ø Chipset Section Problem

Ø Clock Section Problem

Ø BIOS Section Problem

2-Code: C1C0, C5C6, A004, C100, FFA0

Problem Issue:

Ø RAM Section

Ø BIOS Section

3-Code: still/hold Post: E0, E1, A0, A1 D0, D1 and D4

Problem Issue:

Ø BIOS Programming

Ø Moistening in MB

RAM section Problem