In the pic, just to the right of the test card, I see that you don't have the CMOS battery installed. Install a CR2032 lithium battery and with any luck you'll be on your way.

Didn't make a difference.

Make a clear CMOS?
Put the card in an ISA slot - any different code?

CMOS clear also didn't make a difference.

When I plug the card in an ISA slot I do not get any postcodes on the card. Interestingly the card behaves differently on every boot in the ISA slot. Sometimes I get only the 5v or 12v LED lit and nothing else, sometimes I get 3,3v, 5v 12, and IRDY. This even changes in the same slot from boot to boot.

I think then there is an issue with the power supply? Check/exchane bad caps?

But this is interesting as to my knowloegde PCI is initialized after ISA therefore there should be better chance to see something on the ISA bus?

PCI bus originates from the northbridge, ISA bus from the southbridge. Maybe one of the chips is defective, or there is a broken trace/via between them.

OK. But this doenst explain the issue with the Power-LEDs on the cards. These are more or less directly connected to the power supply, so there seems to be something wrong on this way. All 4 LEDs on the top should light all the time.

Try to POST without the POST card ? I've had some mobos that didn't POST if I used a POST card in them for some reason ...

What does it get to if you install a video card? Try both AGP and PCI.

Predator99 wrote:

I think then there is an issue with the power supply? Check/exchane bad caps?

[…]

The power supply I'm using should be fine. Its a modern one (Antec EA-380D) and it works just fine with my other identical DFI board and also with power hungry CPUs like a 3.2 GHZ 478 P4 so it should be fine. Bad caps is a possibility, I already checked one a couple of month ago and it was fine, but since desoldering all of, I think, 29 caps with just an iron would take a godd while I would like to narrow it down more to specific regions of the board (e.g. near chip X).

Deksor wrote:

Try to POST without the POST card ? I've had some mobos that didn't POST if I used a POST card in them for some reason ...

Didn't make a difference.

cyclone3d wrote:

What does it get to if you install a video card? Try both AGP and PCI.

Well it doesn't post, I tested with multiple known good AGP and PCI video cards. If I keep the post card inserted when I plug the GPU in I don't get a reading on the display anymore. But the board still seems to do whatever its doing fine, since the IRDY LED still flashes once just like without a GPU.

I have some more observations. The postcard seems to work fine (just without a reading on the LED display which according to the manual is normal behavior one some boards with the card), only if I quickly power the system of and one, like when switching the post card between slots, it starts to behave weird like described above.

If this all makes any sense to anyone, pleas let me know, otherwise I'll probably bite the bullet and recap the board.

Eleanor1967 wrote:

Predator99 wrote:

I think then there is an issue with the power supply? Check/exchane bad caps?

[…]

The power supply I'm using should be fine. Its a modern one (Antec EA-380D) and it works just fine with my other identical DFI board and also with power hungry CPUs like a 3.2 GHZ 478 P4 so it should be fine. Bad caps is a possibility, I already checked one a couple of month ago and it was fine, but since desoldering all of, I think, 29 caps with just an iron would take a godd while I would like to narrow it down more to specific regions of the board (e.g. near chip X).

Yes, I was not talking about the supply itself but the circuit on your board. You will agree that without solving the problem...

"Sometimes I get only the 5v or 12v LED lit and nothing else, sometimes I get 3,3v, 5v 12, and IRDY. This even changes in the same slot from boot to boot."

...you will not get the board running. Or does your working board show the same behaviour?

Try reseating your memory.. I have had a few motherboards that are extremely fussy regarding how the memory is inserted.. like the slot is slightly wider than the memory sticks

Eleanor1967 wrote:

CMOS clear also didn't make a difference.
Interestingly the card behaves differently on every boot in the ISA slot. Sometimes I get only the 5v or 12v LED lit and nothing else, sometimes I get 3,3v, 5v 12, and IRDY. This even changes in the same slot from boot to boot.

It's weird because ISA BUS connector doesn't have 3.3v rail. Do you install the POST card into an ISA connector respecting PIN1 ?
Another option is that pins of ISA connectors are heavily oxidated.
Will you get an error (C1) or beeping if the MB start without RAM ?
Is CLR-CMOS jumper set to right position ?
Of course check if there are no scratches on board
If you have a multimeter you can measure on voltage regulators of CPU, RAM and so on...

Predator99 wrote:

Yes, I was not talking about the supply itself but the circuit on your board. You will agree that without solving the problem...

"Sometimes I get only the 5v or 12v LED lit and nothing else, sometimes I get 3,3v, 5v 12, and IRDY. This even changes in the same slot from boot to boot."

...you will not get the board running. Or does your working board show the same behaviour?

Yes, even my working board shows the same behavior. It only once in 5 power ups showed my any 5V on the postcard ..

oohms wrote:

Try reseating your memory.. I have had a few motherboards that are extremely fussy regarding how the memory is inserted.. like the slot is slightly wider than the memory sticks

Tried different sticks in all the slots.. nothing.

Roman555 wrote:

It's weird because ISA BUS connector doesn't have 3.3v rail. Do you install the POST card into an ISA connector respecting PIN1 […]
Show full quote

It's weird because ISA BUS connector doesn't have 3.3v rail. Do you install the POST card into an ISA connector respecting PIN1 ?
Another option is that pins of ISA connectors are heavily oxidated.
Will you get an error (C1) or beeping if the MB start without RAM ?
Is CLR-CMOS jumper set to right position ?
Of course check if there are no scratches on board
If you have a multimeter you can measure on voltage regulators of CPU, RAM and so on...

Yes, they card was plugged in respecting PIN1. I can’t spot any oxidation on the ISA slot, if there was any it should be rubbed of by inserting the post card approximately 500 times…

Yes the board beeps and halts at C1 without memory. CLR-CMOS jumper should be in the correct position. I do not have the manual for this rev C board, only for the B3 and a later C revision board. Assuming the this rev C board does not have this setting reversed it should be good. Physically the board looks fine, I will check the voltages, haven’t done so yet. (Probably should have done this earlier)

Maybe this manual is about your motherboard revision... or look up here:
ftp://ftp.retronn.de/mirrors/www.elhvb.com_mo … uals/586/p5bv3/

You are right, that seems to be the right manual for my board. So I know for sure the jumper are correct. Thanks

Thread may be long gone, but I have the same error code on my mobo. Did you get it to work?

karicersken wrote on 2025-01-21, 17:55:

Thread may be long gone, but I have the same error code on my mobo. Did you get it to work?

Welcome to VOGONS.
The debug code 0B issue isn't easy to fix. The simplest solutions was described in the topic : fresh CMOS battery, right position of Clear CMOS jumper, correct BIOS.