no lights on initial power up
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John Durgan
Feb 15, 2025, 10:50:30 AM2/15/25
to [PiDP-11]
I just finished the initial soldering of part and did the initial test. The pi Powered up with no problem, and I got a prompt on my monitor. I was very meticulous about the polarity of the both the diodes and the leds. This is my fourth kit, so I know the solder is good. I have gone over all the solder joints a second time just to be sure. I re seated the IC, and am quite sure about its orientation. Any Suggestions. It doesn't seem like the PCB is getting any power.
I will be very grateful for any help on this.
p.s. This is my second PDP-11. The first one works perfectly.
John Durgan
Flavio Villanustre
Feb 15, 2025, 11:01:39 AM2/15/25
to John Durgan, [PiDP-11]
John,
This is where the fun begins! There could be a million reasons for the LEDs to not come up (well, maybe not a million, but at least a dozen :) ). First of all, do you have a multimeter? If no LED comes up at all, check the traces that provide Vcc and ground (3v3 should be on pin 1 of the raspberry pi connector). Secondly, there is a wonderful schematic at: https://obsolescence.wixsite.com/obsolescence/pidp-11-technical-details. Using that one, you can see where things are connected (if you need help interpreting it, just ping me). Third, make sure that the raspberry pi is plugged correctly on the GPIO connector and not shifted up, down or to a side. Fourth, double check that the insulation that you put on between the metal on the raspberry pi connectors and your board is properly placed and the pi is not creating a short circuit.
And, I think I ran out of ideas. If you need help, just ping me and we can run a live video session to see where you are at and give you some ideas.
Best,
Flavio
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timr...@gmail.com
Feb 15, 2025, 11:12:46 AM2/15/25
to [PiDP-11]
I built my pidp-11 long ago so don't remember all about it. Is there a "lights test" script like there is with other kits? Have you tried to boot one of the provided OS's?
What have you done since power on? I have no spare Pi right now to try my pidp-11. One is on order. I stole the one I had in the 11 for my 8. :)
Flavio Villanustre
Feb 15, 2025, 11:23:33 AM2/15/25
to timr...@gmail.com, [PiDP-11]
Not that I remember. But all the lights should come up once the pi boots because switches are not there yet. Test #1 in the build instructions is quite clear.
It seems to me that there is no power to the main board, so something wrong with the connection of Pin 1 in the GPIO would be my first guess.
Best,
Flavio
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/dba22b22-8742-4db8-bbd1-87deb56a3200n%40googlegroups.com.
John Durgan
Feb 15, 2025, 12:04:47 PM2/15/25
to [PiDP-11]
I have checked the 3.3vdc output of pin one on the pi. It is reading 3.28vdc. How is the best way to check if the PCB is getting that power? On the PCB if I want to check voltage coming into the PCB where can I touch the ground probe of my meter?
Flavio Villanustre
Feb 15, 2025, 1:35:38 PM2/15/25
to John Durgan, [PiDP-11]
Check the circuit schematic that I included with my first response to you. Also check that the IC legs are not folded (sometimes it happens when you are pushing it in if not extremely careful).
Best,
Flavio
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/328e1451-0502-4edd-91f5-bee95ef52be4n%40googlegroups.com.
John Durgan
Feb 15, 2025, 1:42:11 PM2/15/25
to [PiDP-11]
I checked the IC for folded pins, no problem there. I can't see why there is no power getting to the PCB. Pin one on the pi has voltage. I am not sure how to check the voltage on the PCB. Could there be something wrong with the setup on the PI itself. It seems to be working fine.
John
Flavio Villanustre
Feb 15, 2025, 1:48:15 PM2/15/25
to John Durgan, [PiDP-11]
Yes, it could be the setup of the pi. Did you make sure that the pidp process is running? When you login to the pi over ssh, do you see it? "Ps -ax" will tell you if it runs. You can try to run it again, just in case.
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/6c102ff1-7487-479a-8be2-6b096e0d4c2fn%40googlegroups.com.
Steven A. Falco
Feb 15, 2025, 2:10:11 PM2/15/25
to pid...@googlegroups.com
Pin 1 on the Pi (3.3 volts) is not used on the PCB, other than going to a pad that can be used for user modifications/additions.
Pins 2 & 4 are used on the PCB and should have 5 volts to ground (which is available on pin 6) - that is what is being fed to the IC. So measure from pin 4 to pin 6 and you should have 5 volts.
There is a diode in the path to the IC to drop the voltage slightly. It would be good to check to make sure the diode isn't installed backwards. Also, if you check the voltage on both sides of the diode (relative to ground on pin 6), you should see roughly 5 volts. The side of the diode with the black stripe will have slightly lower voltage than the other side of the diode.
Steve
On 2/15/25 01:47 PM, Flavio Villanustre wrote:
> Yes, it could be the setup of the pi. Did you make sure that the pidp process is running? When you login to the pi over ssh, do you see it? "Ps -ax" will tell you if it runs. You can try to run it again, just in case.
>
> To view this discussion visit https://groups.google.com/d/msgid/pidp-11/6c102ff1-7487-479a-8be2-6b096e0d4c2fn%40googlegroups.com <https://groups.google.com/d/msgid/pidp-11/6c102ff1-7487-479a-8be2-6b096e0d4c2fn%40googlegroups.com?utm_medium=email&utm_source=footer>.
> To view this discussion visit https://groups.google.com/d/msgid/pidp-11/CAEUQ4QF%2BEnja8ioS8FZTWVTtoyoxFVXeeOZvOfUFztM4Dkg2ow%40mail.gmail.com <https://groups.google.com/d/msgid/pidp-11/CAEUQ4QF%2BEnja8ioS8FZTWVTtoyoxFVXeeOZvOfUFztM4Dkg2ow%40mail.gmail.com?utm_medium=email&utm_source=footer>.
Pins 2 & 4 are used on the PCB and should have 5 volts to ground (which is available on pin 6) - that is what is being fed to the IC. So measure from pin 4 to pin 6 and you should have 5 volts.
There is a diode in the path to the IC to drop the voltage slightly. It would be good to check to make sure the diode isn't installed backwards. Also, if you check the voltage on both sides of the diode (relative to ground on pin 6), you should see roughly 5 volts. The side of the diode with the black stripe will have slightly lower voltage than the other side of the diode.
Steve
On 2/15/25 01:47 PM, Flavio Villanustre wrote:
> Yes, it could be the setup of the pi. Did you make sure that the pidp process is running? When you login to the pi over ssh, do you see it? "Ps -ax" will tell you if it runs. You can try to run it again, just in case.
>
> On Sat, Feb 15, 2025, 13:42 John Durgan <durgan...@gmail.com <mailto:durgan...@gmail.com>> wrote:
>
> I checked the IC for folded pins, no problem there. I can't see why there is no power getting to the PCB. Pin one on the pi has voltage. I am not sure how to check the voltage on the PCB. Could there be something wrong with the setup on the PI itself. It seems to be working fine.
>
> John
>
>
> I checked the IC for folded pins, no problem there. I can't see why there is no power getting to the PCB. Pin one on the pi has voltage. I am not sure how to check the voltage on the PCB. Could there be something wrong with the setup on the PI itself. It seems to be working fine.
>
> John
>
> On Saturday, February 15, 2025 at 12:35:38 PM UTC-6 fvilla...@gmail.com <mailto:fvilla...@gmail.com> wrote:
>
> Check the circuit schematic that I included with my first response to you. Also check that the IC legs are not folded (sometimes it happens when you are pushing it in if not extremely careful).
>
> Best,
>
> Flavio
>
> On Sat, Feb 15, 2025, 12:04 John Durgan <durgan...@gmail.com> wrote:
>
> I have checked the 3.3vdc output of pin one on the pi. It is reading 3.28vdc. How is the best way to check if the PCB is getting that power? On the PCB if I want to check voltage coming into the PCB where can I touch the ground probe of my meter?
>
> On Saturday, February 15, 2025 at 10:23:33 AM UTC-6 fvilla...@gmail.com wrote:
>
> Not that I remember. But all the lights should come up once the pi boots because switches are not there yet. Test #1 in the build instructions is quite clear.
>
> It seems to me that there is no power to the main board, so something wrong with the connection of Pin 1 in the GPIO would be my first guess.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 11:12 AM timr...@gmail.com <timr...@gmail.com> wrote:
>
> I built my pidp-11 long ago so don't remember all about it. Is there a "lights test" script like there is with other kits? Have you tried to boot one of the provided OS's?
> What have you done since power on? I have no spare Pi right now to try my pidp-11. One is on order. I stole the one I had in the 11 for my 8. :)
>
> On Saturday, February 15, 2025 at 10:01:39 AM UTC-6 fvilla...@gmail.com wrote:
>
> John,
>
> This is where the fun begins! There could be a million reasons for the LEDs to not come up (well, maybe not a million, but at least a dozen :) ). First of all, do you have a multimeter? If no LED comes up at all, check the traces that provide Vcc and ground (3v3 should be on pin 1 of the raspberry pi connector). Secondly, there is a wonderful schematic at: https://obsolescence.wixsite.com/obsolescence/pidp-11-technical-details <https://obsolescence.wixsite.com/obsolescence/pidp-11-technical-details>. Using that one, you can see where things are connected (if you need help interpreting it, just ping me). Third, make sure that the raspberry pi is plugged correctly on the GPIO connector and not shifted up, down or to a side. Fourth, double check that the insulation that you put on between the metal on the raspberry pi connectors and your board is properly placed and the pi is not creating a short circuit.
>
> Check the circuit schematic that I included with my first response to you. Also check that the IC legs are not folded (sometimes it happens when you are pushing it in if not extremely careful).
>
> Best,
>
> Flavio
>
> On Sat, Feb 15, 2025, 12:04 John Durgan <durgan...@gmail.com> wrote:
>
> I have checked the 3.3vdc output of pin one on the pi. It is reading 3.28vdc. How is the best way to check if the PCB is getting that power? On the PCB if I want to check voltage coming into the PCB where can I touch the ground probe of my meter?
>
> On Saturday, February 15, 2025 at 10:23:33 AM UTC-6 fvilla...@gmail.com wrote:
>
> Not that I remember. But all the lights should come up once the pi boots because switches are not there yet. Test #1 in the build instructions is quite clear.
>
> It seems to me that there is no power to the main board, so something wrong with the connection of Pin 1 in the GPIO would be my first guess.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 11:12 AM timr...@gmail.com <timr...@gmail.com> wrote:
>
> I built my pidp-11 long ago so don't remember all about it. Is there a "lights test" script like there is with other kits? Have you tried to boot one of the provided OS's?
> What have you done since power on? I have no spare Pi right now to try my pidp-11. One is on order. I stole the one I had in the 11 for my 8. :)
>
> On Saturday, February 15, 2025 at 10:01:39 AM UTC-6 fvilla...@gmail.com wrote:
>
> John,
>
>
> And, I think I ran out of ideas. If you need help, just ping me and we can run a live video session to see where you are at and give you some ideas.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 10:50 AM John Durgan <durgan...@gmail.com> wrote:
>
> I just finished the initial soldering of part and did the initial test. The pi Powered up with no problem, and I got a prompt on my monitor. I was very meticulous about the polarity of the both the diodes and the leds. This is my fourth kit, so I know the solder is good. I have gone over all the solder joints a second time just to be sure. I re seated the IC, and am quite sure about its orientation. Any Suggestions. It doesn't seem like the PCB is getting any power.
>
> I will be very grateful for any help on this.
>
> p.s. This is my second PDP-11. The first one works perfectly.
>
> John Durgan
>
> --
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> And, I think I ran out of ideas. If you need help, just ping me and we can run a live video session to see where you are at and give you some ideas.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 10:50 AM John Durgan <durgan...@gmail.com> wrote:
>
> I just finished the initial soldering of part and did the initial test. The pi Powered up with no problem, and I got a prompt on my monitor. I was very meticulous about the polarity of the both the diodes and the leds. This is my fourth kit, so I know the solder is good. I have gone over all the solder joints a second time just to be sure. I re seated the IC, and am quite sure about its orientation. Any Suggestions. It doesn't seem like the PCB is getting any power.
>
> I will be very grateful for any help on this.
>
> p.s. This is my second PDP-11. The first one works perfectly.
>
> John Durgan
>
> --
> You received this message because you are subscribed to the Google Groups "[PiDP-11]" group.
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>
> --
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>
>
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John Durgan
Feb 15, 2025, 3:51:58 PM2/15/25
to [PiDP-11]
I have checked the voltage on the PCB between pins 4 and 6 on the soldered side of the GPIO connector and get a reading of 5.20 VDC. when I measure between pin 6 and the far side of the in line diode The reading drops to 4.50. So there is voltage getting to the PCB.
John Durgan
Feb 15, 2025, 3:53:07 PM2/15/25
to [PiDP-11]
I noticethat the black stripe side of the diode goes to the IC. Is it possible that the Chip is damaged in some way?
terry-...@glaver.org
Feb 15, 2025, 3:55:05 PM2/15/25
to [PiDP-11]
I believe the instructions still say to use cardboard as a shim between the Pi and the front
panel to prevent things from shorting out. This can cause connection issues if the Pi isn't
fully seated in the front panel's GPIO connector.
The cardboard is for insulation, not spacing. Check to make sure it isn't too thick.
The cardboard is for insulation, not spacing. Check to make sure it isn't too thick.
John Durgan
Feb 15, 2025, 4:38:30 PM2/15/25
to [PiDP-11]
Yes they do, I used cardboard. I have ordered several replacement ICs just in case I need a replacement.
Steven A. Falco
Feb 15, 2025, 4:49:53 PM2/15/25
to pid...@googlegroups.com
As I was looking around, I came across a test program which I've attached.
I personally haven't used it, but it might be helpful to see if the hardware is the issue or if the software is the issue.
Steve
> This is where the fun begins! There could be a million reasons for the LEDs to not come up (well, maybe not a million, but at least a dozen :) ). First of all, do you have a multimeter? If no LED comes up at all, check the traces that provide Vcc and ground (3v3 should be on pin 1 of the raspberry pi connector). Secondly, there is a wonderful schematic at: https://obsolescence.wixsite.com/obsolescence/pidp-11-technical-details <https://obsolescence.wixsite.com/obsolescence/pidp-11-technical-details>. Using that one, you can see where things are connected (if you need help interpreting it, just ping me). Third, make sure that the raspberry pi is plugged correctly on the GPIO connector and not shifted up, down or to a side. Fourth, double check that the insulation that you put on between the metal on the raspberry pi connectors and your board is properly placed and the pi is not creating a short circuit.
> To view this discussion visit https://groups.google.com/d/msgid/pidp-11/175c046d-3619-4e6f-bf03-dd9588d0ea93n%40googlegroups.com <https://groups.google.com/d/msgid/pidp-11/175c046d-3619-4e6f-bf03-dd9588d0ea93n%40googlegroups.com?utm_medium=email&utm_source=footer>.
I personally haven't used it, but it might be helpful to see if the hardware is the issue or if the software is the issue.
Steve
>
> And, I think I ran out of ideas. If you need help, just ping me and we can run a live video session to see where you are at and give you some ideas.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 10:50 AM John Durgan <durgan...@gmail.com> wrote:
>
> I just finished the initial soldering of part and did the initial test. The pi Powered up with no problem, and I got a prompt on my monitor. I was very meticulous about the polarity of the both the diodes and the leds. This is my fourth kit, so I know the solder is good. I have gone over all the solder joints a second time just to be sure. I re seated the IC, and am quite sure about its orientation. Any Suggestions. It doesn't seem like the PCB is getting any power.
>
> I will be very grateful for any help on this.
>
> p.s. This is my second PDP-11. The first one works perfectly.
>
> John Durgan
>
> --
> You received this message because you are subscribed to the Google Groups "[PiDP-11]" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pidp-11+u...@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/pidp-11/c93a7f22-c0f3-4ebb-850d-22bdc448444fn%40googlegroups.com <https://groups.google.com/d/msgid/pidp-11/c93a7f22-c0f3-4ebb-850d-22bdc448444fn%40googlegroups.com?utm_medium=email&utm_source=footer>.
> And, I think I ran out of ideas. If you need help, just ping me and we can run a live video session to see where you are at and give you some ideas.
>
> Best,
>
> Flavio
>
>
> On Sat, Feb 15, 2025 at 10:50 AM John Durgan <durgan...@gmail.com> wrote:
>
> I just finished the initial soldering of part and did the initial test. The pi Powered up with no problem, and I got a prompt on my monitor. I was very meticulous about the polarity of the both the diodes and the leds. This is my fourth kit, so I know the solder is good. I have gone over all the solder joints a second time just to be sure. I re seated the IC, and am quite sure about its orientation. Any Suggestions. It doesn't seem like the PCB is getting any power.
>
> I will be very grateful for any help on this.
>
> p.s. This is my second PDP-11. The first one works perfectly.
>
> John Durgan
>
> --
> You received this message because you are subscribed to the Google Groups "[PiDP-11]" group.
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>
> --
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> --
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>
>
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>
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Steven A. Falco
Feb 15, 2025, 5:00:11 PM2/15/25
to pid...@googlegroups.com
I just tried the program and it works properly on my unit. The lights cycle on and off. I have a Pi 4b in my unit. Oh, and your voltages look reasonable.
To run it, I set it to be executable and it started right up. Here are the commands:
chmod 755 PiDP1170Test.py
./PiDP1170Test.py
Steve
To run it, I set it to be executable and it started right up. Here are the commands:
chmod 755 PiDP1170Test.py
./PiDP1170Test.py
Steve
timr...@gmail.com
Feb 15, 2025, 6:04:18 PM2/15/25
to [PiDP-11]
I will try that test program when I get my Pi4 on Monday.
Anton Lavrentiev
Feb 15, 2025, 6:07:22 PM2/15/25
to Steven A. Falco, [PiDP-11]
Just make sure you stop the pidp service first, prior to running the Python test...
You can just kill the "server11" process for that, IIRC "killall server11"...
service pidp11 stop" does it more properly.
I hope I remember the commands right, I'm not by my pidp atm
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/91575ef4-116b-43b1-a24c-26cad636da3d%40gmail.com.
John Durgan
Feb 16, 2025, 2:56:53 PM2/16/25
to [PiDP-11]
Today I erased my SD card and did a new download and install of the software per the instructions in the build manual. I set the pi to boot to the GUI. now, All the lights save one come on and stay on. Part of the software install was a question about loading 2bit 4 bit, or compile from the source. I had no idea what to select. When I did the original install I did not see any of the "lode operating systems, or any blinkenlights material.
I selected to compile from source option. Was that the right choice? anyway I have lights but no blinking. also how do you increase the font size in the command line window?
John Durgan
Feb 16, 2025, 4:23:20 PM2/16/25
to [PiDP-11]
ok, I have everything working now. After reloading the pidp software, and and following the instructions for testing the lights and connections. All seems to be go for the soldering of the switches. One question once in the screen that shows the boot choices, how do you get out of that screen and back to the gui or terminal prompt?
By the way I really appreciate all the help I. have gotten on this project.
John D
Flavio Villanustre
Feb 16, 2025, 5:11:36 PM2/16/25
to John Durgan, [PiDP-11]
John, it's great to hear that! I am not sure I understand which screen you are referring to. If you accessed via ssh and you have it configured to get into your screen session automatically, you see a simh screen. If that's the case, Ctrl-A D will get you out of it and back into the shell. If not, please let me know what specific screen you are trapped into.
Best,
Flavio
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/8ac96f16-2300-4475-bfc1-88a16a124cb5n%40googlegroups.com.
John Durgan
Feb 17, 2025, 7:33:08 AM2/17/25
to [PiDP-11]
that is the screen I was talking about, so ctrl-A D. The text is very small on that screen. Is there a way to make it bigger. It is very hard to read
Flavio Villanustre
Feb 17, 2025, 8:45:07 AM2/17/25
to John Durgan, [PiDP-11]
Ah, yes!
Can't you go to the terminal preferences and change the font size? Or if you are using an SSH client, can you select a bigger font on your client?
Best,
Flavio
To view this discussion visit https://groups.google.com/d/msgid/pidp-11/24e1a43e-e1fa-4c13-8475-78b344610518n%40googlegroups.com.
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