bios post cards or other fault diagnostic methods

[ktmmotocross]

Hello.
I buy two post cards for diagnostic boards when all voltages and pwsignals is working but have blacck screen. One 5$ shit and Debug king post card, but they uset to be nearly unusefull. Have anybody some better cards or other diagnostic methods when board is starting but no video??

[Th3_uN1Qu3]

Re: bios post cards or other fault diagnostic methods

Debug cards only work when the mainboard has routed the LPC bus thru to the wifi card slot. This is not a requirement, it is optional in the specs, so it's up to the manufacturer to do it. Generally i've noticed that HPs all seem to have it, other manufacturers, less so. The bus is always exposed somewhere on the motherboard but you'll have to solder wires.

In most cases it still boils down to voltage measurements. Or if you have a fancy digital scope...

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

U ROCK MAN!!!!
i was sad about not working cards and now i look to the schematic for laptop and found debug connector. Im gonna make some wiring and wish me luck :-)

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

this work sucks. no connector on board and sooo tiny 14 pins that must have soldered connector and attach flex with stripped wires. lot of work.

[Th3_uN1Qu3]

Re: bios post cards or other fault diagnostic methods

LPC bus is only 7 wires.

[stj]

Re: bios post cards or other fault diagnostic methods

use kynar wire.
if you need REALLY small wire, use enamel covered copper wire by unwinding a small transformer.

[Agent24]

Re: bios post cards or other fault diagnostic methods

I bought one of those PCI tester cards for desktops years ago, it worked in only one board (Pentium 1)

The next time I tried it in another board, the ICs got hot and the motherboard was killed. Cheap Chinese trash!

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

1 image - asus f5z - no connector
2 image - dr4ag soldering works good
3 image - attached flax and strip wires
4 image - schematic of LPC connector
5 image - Anybody know where i can find connector to this slot?

[Th3_uN1Qu3]

Re: bios post cards or other fault diagnostic methods

Steal a mini-PCIE from a dead board.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

i mean the LPC port/picture edited/

went to the best local parts store but they will have it about week

[pcbmaniac]

Re: bios post cards or other fault diagnostic methods

It seams we have the same POST card. I used mine connected to LPC debug points but i get it working only when i press power on button, then i get only clk and 3,3V signals. This card works OK when connected to PCI slot only.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

but mini pci slots have VERRY LITTLE support.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

damn my card missing just the elpc conector.

[pcbmaniac]

Re: bios post cards or other fault diagnostic methods

Telling the truth, i didn't manage to see any difference. Why don't you put it to wifi slot for testing? It has mini pci-e port on every laptop.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

ofcourse i put it to minipcie port but it seems that noone board is supported.
ELPC port have only asus

[Th3_uN1Qu3]

Re: bios post cards or other fault diagnostic methods

I have the same card too. Like i said, it works well on HP laptops, hit and miss with all others.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

no luck with LPC on other board? my card work only on ddr1 but never on ddr2/3

[pcbmaniac]

Re: bios post cards or other fault diagnostic methods

Don't you manage to test it? No lights? Show us a photo of the card already connected to mobo on mini pci-e slot when you press power on button.

[ktmmotocross]

Re: bios post cards or other fault diagnostic methods

just CLK light up and have 0 on code

[Th3_uN1Qu3]

Re: bios post cards or other fault diagnostic methods

It means it simply doesn't put out any codes... There are boards which give LPC clock but don't put out codes. For the POST card to report anything, the KBC and soutbhridge have to be good.