Optiplex 390 0m5dcd Front Panel I/O Pinout (need help)

[emdea]

Greetings, I've been trying to use a dell mobo in  a normal ATX case but i'm stuck trying to figure out dell's proprietary pinout for the front panel headers. I've managed to fix the PWR button failure warning by shorting pins on the 6pin header but i've yet to figure out how to get rid of the pesky i/o failure warning when the PC boots up. I only have the motherboard so using the original case to figure out what goes where is out of the question. I've successfully managed to transplant an HP SFF mobo in an ATX case before but that time i had the original case and the biggest challenge there was the 12vsb instead of 5vsb on regular ATX PSUs. Dell seems hell bent (pun intended) on making project like this as difficult as possible.

 

I've found a similar topic on this forum but it only addresses the 6pin power header and a 20pin front panel. It did help me get rid of the pwr button failure but i'm left with the i/o failure

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Also there seems to be two ways to power on the mobo:

 

 

 

More pictures of the motherboard if it helps.

 

 

I've tried shorting random pins on the header with no luck, i've also shorted the audio and usb headers in case they were the ones giving the error (HP mobo got fixed this way) but still nothing. Any ideas? 

[emdea]

I've managed to get my hands on a working Optiplex 390 and was able to measure the cables. Will post a solution when i have time to actually apply the fix to the board in case someone else needs help solving this. There is a 3 pin short on the 16pin cable, and two more shorts -> one on the audio cable and one on the left usb; if any of these is missing you will get the i/o cable failure message.

 

Audio and USB:

 

16pin header:

 

EDIT: for the 5pin PWR_SW pinout -> use black + yellow for PWR_ON (actual power switch) and short red + yellow to get rid of the error. I don't have the board anymore so had to use google, but this is the way i wired up mine. I have to add that at first i shorted red and blue out of convenience but the board would randomly refuse to power on at times, this was fixed after some soldering to connect it the proper way.

p.s. Dell is hell

[BleachedFur]

On 5/4/2019 at 2:34 PM, emdea said:

I've tried shorting random pins on the header with no luck, i've also shorted the audio and usb headers in case they were the ones giving the error (HP mobo got fixed this way) but still nothing. Any ideas? 

Hello! I work with Dells all the time. The 2010+ Optiplexes need their USB headers plugged in as well to fully remove the error. Some of the pins on the large header near the SATA ports are sense pins so they need to be shorted (they are grounded).

 

In addition, the 390, 3010, and 7010 share the same model of motherboard, however the BIOS installed controls the fans. If you would rather use the front fan or the rear fan, you can cross flash BIOSes. I've done this without problems.

[rpiccini]

On 5/5/2019 at 7:31 AM, emdea said:

I've managed to get my hands on a working Optiplex 390 and was able to measure the cables. Will post a solution when i have time to actually apply the fix to the board in case someone else needs help solving this. There is a 3 pin short on the 16pin cable, and two more shorts -> one on the audio cable and one on the left usb; if any of these is missing you will get the i/o cable failure message.

 

Audio and USB:

 

16pin header:

 

EDIT: for the 5pin PWR_SW pinout -> use black + yellow for PWR_ON (actual power switch) and short red + yellow to get rid of the error. I don't have the board anymore so had to use google, but this is the way i wired up mine. I have to add that at first i shorted red and blue out of convenience but the board would randomly refuse to power on at times, this was fixed after some soldering to connect it the proper way.

p.s. Dell is hell

Hi, this thread helping me a lot, but i still have de "Frontt I/O cable failure".

 

Can you confirm the pins that i have to short?

 

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This is it?

[marine]

help guys plaese ;

can you tell me the best replacment for the "shorted" mosfet on this board

[Mduddy]

On 8/26/2019 at 3:33 PM, rpiccini said:

Hi, this thread helping me a lot, but i still have de "Frontt I/O cable failure".

 

Can you confirm the pins that i have to short?

 

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This is it?

Okay so I’ve been stuck on this for days the front i/o error and I’ve finally worked it out .... so here goes 

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i used old case power supply pins cut the wires short plugged them into the header in spots - wired the 3 wires togeather and covered with heat shrink to keep it tidy 

 

the power button pin out is at the top as shown hope this helps some people :) 

 

also so anyone getting the fan error just cut into the cpu fan yellow wire and run a wire to the other fan header giving you the error and attach where old yellow wire used to be