Industrial PC mystery - Page 1
Forum section: electronics / general

author: midasgossye
author_rank: Contributor
timestamp: February 18, 2021, 01:33:37 pm
content: I got an old industrial pc out of the dumpster, and was trying to see if I could get it booted up.Sadly, it has a very weird power connector. Trying to look up any of the part numbers on google didn't return any meaningful results...I tried to find-out the pinout by probing it with a multimeter, and it looks like 5 of the 7 bottom row pins are +12V, and 6 of the 7 top row pins are GND, but that still leaves 3 mystery pins...I applied 12 V to the "correct" pins I probed, but nothing happened, it only drew a couple of mA.Anyone here who has a bit more knowledge about IPCs who has any clue what kind of power connector this thing uses?It would be awesome if I could get it sort of powered up at leastThanks!See attached photos for more detiails

author: midasgossye
author_rank: Contributor
timestamp: February 18, 2021, 04:00:45 pm
content: Managed to get the PCB out of the case. Here are some additional pictures:

author: nali
author_rank: Frequent Contributor
timestamp: February 18, 2021, 04:17:08 pm
content: Looks like Molex Micro-Fit to mehttps://www.digikey.co.uk/product-detail/en/molex/0430251400/WM2489-ND/531405

author: JDubU
author_rank: Frequent Contributor
timestamp: February 18, 2021, 04:41:43 pm
content: Standard ATX power supplies for PCs have two extra connections called "PS_ON#" and "PS_OK".PS_ON# is a ground level signal from the motherboard to tell the power supply to go from standby to power on.PS_OK is a 5V signal from the power supply telling the motherboard that it is powered on.https://www.electronics-tutorials.ws/blog/convert-atx-psu-to-bench-supply.htmlMaybe those are two of the extra pins on your connector?

author: midasgossye
author_rank: Contributor
timestamp: February 18, 2021, 04:52:23 pm
content: Thanks for the useful repliesQuoteOn the PCB next to one of the mystery pins it says "V5SB" which I think probably translates to a 5V Standby supply or something, or maybe the "PS-OK" 5V signal that you mentioned?It also has a thicker trace then most "signal/data-only" traces.The two other mystery pins are buggering off to somewhere else with very thin "signal" traces, so maybe indeed one of these two is signalling that the PS and/or PC must turn on?QuoteYou are probably right! It looks like an exact match to the connector! Sadly I couldn't find any pinout diagrams that show on what pins 12V and GND are present for instance...

author: midasgossye
author_rank: Contributor
timestamp: February 18, 2021, 10:55:52 pm
content: After some more googling and an answer from another forum I found one website that mentions this model of Industrial PC,http://www.yshp.net/goods-9586-Advantech+EBC-AC14+BOXED+IPC+LOW-END+CPC-11+EBC-AC14M5F-S6A1E.html,but with no real additional data...I unscrewed the heatsync and found out is is using a SOM-6763 module for the processor (Intel Atom), RAM, etc... (datasheet:https://www.digchip.com/datasheets/parts/datasheet/1181/SOM-6763_B1-pdf.php)I probed where the additional pins of the power connector went to, and found out one of them is indeed a 5V standby supply pin.Another went to a W83627HF Winbond LPC I/O Chip to a PWR_CTL# line that should give a signal to the PSU to switch on (equivalent to the function of the PS_ON# that was mentioned earlier).There is one mystery pin remaining then, which I managed to trace to a SOT23-5 device with the label "V3". There is a pullup resistor on this pin to 5V_SB of 10k, and the other pins have the 5V_SB, GND and a signal called PANSWIN that should signal the Winbond LPC I/O Chip to switch on everything.I tried supplying 12V to the 12V in and 5V to the 5V_SB at the same time but nothing happened.... I pulled down the "mystery pin" because it seemed to act as a sort of power switch but that also didn't change anything...Maybe the connector on the other side (also labelled 12V) also needs to be powered? I really don't know how to procede now...

author: Halcyon
author_rank: Unknown
timestamp: February 19, 2021, 12:12:00 am
content: What a bastard of a connector! I remember a while back, Dell used similar power supplies on some of their small form factor machines (see attached). The second one shown was an absolute punish. Over time they failed to make proper contact and caused machines to randomly turn off if you bumped the table. I don't miss them.

author: westfw
author_rank: Super Contributor
timestamp: February 20, 2021, 10:30:24 am
content: Lenovo uses a 14 pin power connector on some of their desktops...

author: Syntax Error
author_rank: Frequent Contributor
timestamp: February 21, 2021, 02:20:43 pm
content: For those playing at home, the Lenovo 14 pin ATX PSU pinout is here:https://www.adventuresindiy.com/computer/lenovo-h530s-how-to-upgrade-your-power-supply

author: coromonadalix
author_rank: Super Contributor
timestamp: February 21, 2021, 07:56:33 pm
content: do you have some voltage on the front 3 pins black connector with the 5 and 12vdc applied ? could it be the power switch with an led

author: Doctorandus_P
author_rank: Super Contributor
timestamp: March 03, 2021, 05:43:10 pm
content: Looks like bog standard 14 pin ATX power supply connector:https://duckduckgo.com/?q=14pin+atx&t=h_&iax=images&ia=images

author: LeonR
author_rank: Regular Contributor
timestamp: March 16, 2021, 03:52:31 pm
content: Looks like a 14-pin RPS connector used in some Cisco/Dell rack equipment.I don't have experience in those, but apparently there's some variations on which rails the PSU can provide over the same connector.https://downloads.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_powerconnect/powerconnect-5524p_setup%20guide2_en-us.pdfhttps://www.cisco.com/c/en/us/td/docs/switches/power_supplies/rps2300/hardware/installation/guide/2300hig/rpscable.pdf