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No Data on Port 1

Started by TNF250, January 16, 2023, 10:52:46 AM

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TNF250

When testing a PiCap on a RPI 3B+ running FPP 6.3, Port 1 does not output data, Port 2 works fine.

I'm testing just 1 pixel attached to port1 when running a display test on all local channels. The pixel does nothing. I do get power, 11.9v when testing the port. Swap the connector to port2 and the pixel lights up and runs the RGB pattern. 

Any idea what could be the issue?

Here is the setup of the channel output.
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

tbone321

Did the PICap work before or is this the first test?  Try changing the start channel to the same ones as port 2 and see if anything changes.

TNF250

Quote from: tbone321 on January 16, 2023, 05:15:40 PMDid the PICap work before or is this the first test?  Try changing the start channel to the same ones as port 2 and see if anything changes.
I never tried the ports, I used this to output DMX which I no longer need it to do. Changed the start channel but still lights. Any other suggestions?


Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

Bwinter

#3
You've verified the power-out (ie, no blown fuse)?

Edit:  nevermind...you've already confirmed that.

jnealand

If you were outputting DMX before I would go to the "Other" tab on the channel outputs and make sure that DMX is no longer active.  Or any other output of any kind.
Jim Nealand
Kennesaw, GA all Falcon controllers, all 12v Master Remote Multisync with Pi and BBB P10 and P5

TNF250

Quote from: jnealand on January 17, 2023, 01:03:41 PMIf you were outputting DMX before I would go to the "Other" tab on the channel outputs and make sure that DMX is no longer active.  Or any other output of any kind.
I was using the PiCap for DMX before attached to a PiZero W. This is a fresh 6.3 install and uses a Pi3B+.
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

Bwinter

I've had one recent instance where the issue was with the Pi itself (or the connection between the Pi and the hat).

I placed the hat on a different Pi, and the port started working — indicating that something was wrong with that specific GPIO pin (and nothing wrong with the hat).

tbone321

Actually, it would be a good idea to remove the hat and make sure that none of the pins on the Pi are bent.  

TNF250

Tried 3 different Pi3B+ and 2 different sd cards same issue on all. I'm thinking it is on the PiCap. With the port getting power and I'm assuming no data could it be the chip that controls the data?
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

tbone321

There is no chip that controls data on the PiCap but it could be a bad optical isolator which it does have for each output.  It would never be the SD card as if it were bad, the Pi would probably never boot up and if it did, FPP would probably not be able to run (been there).  Switching the Pi shows that it is not the problem and many are using 6.X and the cap but you could try loading Ver 5 on one of those SD cards and see if the cap works then.  If it does, then there is some oddball configuration issue with Ver 6 and if not, the cap is bad and will need to either be repaired or replaced.

TNF250

Tried FPP version 5.5 same thing. I'm going to order another PiCap but would like to repair this one and have it as a backup. Tbone321, can you provide more information as to where the optical isolators are located on the board?
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

Bwinter

Not sure which PiCap you have, but is it possible that a socket-able IC wasn't seated properly (and maybe has a bent pin)?

TNF250

It's a Falcon PiCap and all IC seated properly and no pins are bent. 
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

Bwinter

I guess if you want to keep digging deeper, replacing that IC would be the next step?

Based off your screenshot, the FPP settings appear correct.

Have you tried driving the LEDs directly off the GPIO pins (bypassing the PiHat completely)?  GPIO-18 is "port 1" and GPIO-19 is "port 2"

TNF250

Just tried off the GPIO pins both outputted correctly. I'll try ordering and replacing the IC. 

Thank you for all the help
Zane
Springfield, TN

X-Lights - RPi3 - FPP - Falcon - DLA Lynx

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