Some information about HP T620 Plus Flexible Thin Client machines for network appliance builds...

Discussion in 'DIY Server and Workstation Builds' started by BLinux, Jul 2, 2018.

  1. nthu9280

    nthu9280 Well-Known Member

    Joined:
    Feb 3, 2016
    Messages:
    1,418
    Likes Received:
    358
    @BLinux - I read somewhere (may be pfsense forums) that pfSense is picky with WIFI cards, drivers etc and to avoid it for that function. Not sure if that's due to limitations of underlying BSD or something else.
     
    #21
  2. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    that's a good point, and i wouldn't be surprised if it were true. FreeBSD is a bit primitive by modern standards.

    that said, my planned use is with Linux, and that seems to have much broader driver/hardware support.
     
    #22
  3. Patrick

    Patrick Administrator
    Staff Member

    Joined:
    Dec 21, 2010
    Messages:
    11,573
    Likes Received:
    4,515
    I got mine today. It is a lot bigger than I expected!
     
    #23
    arglebargle and fohdeesha like this.
  4. K D

    K D Well-Known Member

    Joined:
    Dec 24, 2016
    Messages:
    1,411
    Likes Received:
    300
    Off topic I know. But your automation system looks awesome.
     
    #24
  5. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    also unrelated, you have a PM to reply to from a few days ago :p
     
    #25
  6. nezach

    nezach Active Member

    Joined:
    Oct 14, 2012
    Messages:
    182
    Likes Received:
    83
    I was thinking it would be nice to have a VGA port since DisplayPort is not always available on the older monitors and based on HP documentation t620 machines might have a VGA+1 serial port instead of 2 serial ports. There is a 16-pin VGA connector on the board, however ribbon cable for this does not seem to exist.

    There is a post on HP website from a while back asking about same thing
    HP T620 Plus – need VGA ribbon cable - HP Support Forum - 5890670
     
    #26
    BLinux likes this.
  7. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    #27
  8. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    that could be nice, but since my machine is running headless, i just reconfigured it to output to serial console. if i ever need to interact with it directly, i just need my laptop (which has monitor + keyboard/mouse) and a serial cable/usb adapter.
     
    #28
  9. nezach

    nezach Active Member

    Joined:
    Oct 14, 2012
    Messages:
    182
    Likes Received:
    83
    yeah, I am going to use serial console as well, but it is nice to have dumb VGA as an option for when you forget your cables and adapters at home.
     
    #29
  10. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    i must be the king of unable to boot T620+ machines....

    I used 'dd' to write your ISO file to a USB drive and it isn't recognized as UEFI bootable device? I even went and just completely disabled legacy boot in the BIOS and now it just says there's nothing it can boot. what am I missing? Is this wrong:

    $ dd if=./t620-bios-v217.iso of=/dev/sdj
     
    #30
  11. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    I'm not sure, dd might not work with the ISO I made. I only tested writing it on windows with Rufus, but it worked with both MBR and GPT format type.

    If you don't have access to windows you can create one from scratch, just format the flash drive to fat32 and make sure it's empty.

    Then create a folder on the root of it called "EFI", then inside that create a folder called "Boot". Then inside that Boot folder place these two files: index - powered by h5ai v0.29.0 (https://larsjung.de/h5ai/) (right click and save as on each file to save it unmodified somewhere on your PC)

    So final result should look like this, assuming the flash drive is drive G (forgive the windows parlance): G:\EFI\Boot

    then in that final Boot folder should be those two files
     
    #31
    raiderj likes this.
  12. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    thanks... that's pretty much what i did right after posting the above. that seems to work just fine. thanks!
     
    #32
  13. nthu9280

    nthu9280 Well-Known Member

    Joined:
    Feb 3, 2016
    Messages:
    1,418
    Likes Received:
    358
    May be you should change you forum name to "BootIssues" :) j/k
     
    #33
    BLinux and fohdeesha like this.
  14. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    LOL... It should be "Bootless" LMAO.
     
    #34
    fohdeesha likes this.
  15. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    As an experiment, i picked up a HP 708778-001 65W AC Adapter to try with the T620 Plus and it does not work. The power button blinks red. The specifications are about the same except for Amperage (basically 65W vs 90W), so I'm surprised it doesn't work. I figure the box is only using 20W or less, so I thought the 65W would work... any thoughts?
     
    #35
  16. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    are you sure the voltage it's putting out is the same? if it's that simple then yes it should work, I don't think these do any kind of signalling (there's only two pins)

    I'm going to take a closer look at mine
     
    #36
  17. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    Measured the output and even though the provided PSU is rated at 19v, it's only putting out 14v, and that's floating (no load). Briefly tried to open the brick to do some more probing but it's completely glued shut with potting compound

    When you look at the two plugs for each, does the nonworking one look different? EG is the center pin shorter? The DC jack that's soldered to the motherboard has 3 pins/traces coming out of it, so I dunno what the third one would be. it could be switch/contact that only gets closed when a longer pin is inserted. will look more
     
    #37
  18. BLinux

    BLinux cat lover server enthusiast

    Joined:
    Jul 7, 2016
    Messages:
    2,359
    Likes Received:
    822
    @fohdeesha I'll take a multimeter to the PSU later to see what I read. The 90W says 19V output on the label, the 65W says 19.5V output on the label. I figure between 19V vs 19.5V that wouldn't really make a difference. 14V seems weird... i'll check both later and report back.
     
    #38
  19. fohdeesha

    fohdeesha Kaini Industries

    Joined:
    Nov 20, 2016
    Messages:
    1,396
    Likes Received:
    1,125
    EDIT: nevermind, just confirmed BOTH power supplies do indeed have 3 contacts, one of them being a sense pin - the 14v I was measuring was between the outer metal and the center pin which was 14v- so the center pin seems to be a sense pin. If you measure from the outer metal ring (ground) to the inner metal (being careful not to touch the center pin) it measures the expected 19V - making the inner metal the positive contact.

    I would imagine the voltage between ground (outer metal) and the center sense pin is different between the two power bricks and that's how the t620 knows what's plugged in
     
    #39
  20. Marsh

    Marsh Moderator

    Joined:
    May 12, 2013
    Messages:
    2,117
    Likes Received:
    964
    HP system have ability to query the power wattage of the PS. It would either pass go or no go.
     
    #40

Share This Page