Retroflag NESPi Case - Soft Power & Reset Hack

Yahmez

@surajd
I am not sure because unlike the 2811 (Mini Mosfet slide switch), Pololu does not provide a full schematic of the circuit.

tectron

Hi I applied the mod and it seems to work well except when I power it off, the power led fades into a low colour red and seems to have a bit of active power. All other LEDs are off. Odd thing is when I disconnect the HDMI it goes out completely.
Any idea why ?

Yahmez

@tectron yes, I had the same thing happen. It took a while to realize that it did not happen with HDMI disconnected which means that the power line in the HDMI cable is back feeding to power the led. I'm not 100% sure exactly how it's happening but I'm fairly certain that besides the led glowing very faintly it has no other ill effects.

Semper 5

Hi there,

I recently completed this mod to "mostly" successful extent. But I do notice something isn't quite right.

RESET BUTTON - Running restart script = shutdown sequence(leaving power on since PWR button is already depressed
Running back-out-of-game script = backs out of game and then after a few seconds goes through shutdown
sequence
POWER BUTTON - Instant power off. Like I unplugged the unit.

I did the hardware and software check in the guide and everything looked good. did the gpio readall and checked connections on the gpio. everything performed identically as per guide even wire color. So I'm truly puzzled by what's wrong here :/

Semper 5

@semper-5 nevermind, it bizarrely is working perfect now. I just pulled the gpio pins going back to step 13. plugged it all back in and voila

zombie

This post is deleted!

zombie

@yahmez said in Retroflag NESPi Case - Soft Power & Reset Hack:

@tectron yes, I had the same thing happen. It took a while to realize that it did not happen with HDMI disconnected which means that the power line in the HDMI cable is back feeding to power the led. I'm not 100% sure exactly how it's happening but I'm fairly certain that besides the led glowing very faintly it has no other ill effects.

I have the same issue on my nespi.

Phoner

This post is deleted!

h00sRdady

Wow! Great work on this one. I ordered up all the parts from the links above and got it all together finally this morning. I used the reset to bounce out of emulator as you had posted in the second script and it works perfect. I ran the GPIO pin test as well and it showed in/in/out just like yours. I press the power button and I see the shutdown script run too... the light stays on after shutdown as well but I understand with the HDMI power feedback... all good...
My only issue I'm having is after I power it down with the power button, I press the power button again and it doesn't power back up. The only way to power back up is to unplug the micro usb from the back and plug it back in and it doesn't seem to matter if the power button is in or out, it will boot up for about 5-10 seconds with the button in the out position and then the screen goes black after reseating the usb power cable and it will boot up completely if I reseat the usb with the power button in the pushed in position. Any ideas what might be causing this?
Thanks in advance!

just_jeepin

@cmarquis Did you ever get a PowerBlock and try it?

Yahmez

@h00srdady Did you try the hardware test? Because honestly it sounds like an issue on the hardware side.

h00sRdady

@yahmez I did try the hardware test tonight. I found I get power to the red led on the case even without the HDMI or the raspberry pi in it. Power button on or off. PCB on wire plugged into the fan + or not. I suspect the traces aren't disconnected all the way. I couldn't locate my xacto's so I tried cutting through them with a fine flat head screw driver. Ran short on time so I'll try again tomorrow.

h00sRdady

@yahmez yep! That was it 😃. I missed the 5th cut on the switch trace leading to the power LED. Now everything works perfect and I don’t even get the backfeed dim light from HDMI. Thanks again!

Yahmez

@h00srdady awesome! Glad you got it running.

snarc

@zombie said in Retroflag NESPi Case - Soft Power & Reset Hack:

@yahmez said in Retroflag NESPi Case - Soft Power & Reset Hack:

@tectron yes, I had the same thing happen. It took a while to realize that it did not happen with HDMI disconnected which means that the power line in the HDMI cable is back feeding to power the led. I'm not 100% sure exactly how it's happening but I'm fairly certain that besides the led glowing very faintly it has no other ill effects.

I have the same issue on my nespi.

I had the same issue, too.
Editing the /boot/config.txt and setting config_hdmi_boost=1 solved the problem. ;)

iLackIQ

@yahmez

I've ran into an issue. The mosfet is set to off. I've checked to make sure none of my solder is being shorted. Whenever I plug the power into the NES Pi case slot regardless if the power switch is pushed in or not it will power the system and the pi. If I push the power switch in, it does nothing but if I push it out again it will shutdown the pi but the fans and lights will stay on. Not sure what to do. Is it possible I blew the cap or a diode?

Yahmez

@ilackiq
Did you perform the hardware test?

iLackIQ

@yahmez
I did, when I take the on part from the mosfet and put it on the positive pin on the fan even with the power switch not pushed in it still powers on. I then push the power in button and leave it go for a few seconds and then turn off the power button and the light stays on its been on for the past minute or two that I've been typing this

Yahmez

@ilackiq then it's a hardware issue. Things to verify: Diodes are in the correct orientation, bottom of gpio pins on the pi are not pushed through the insulation on the wires coming from the mosfet board. Check your work to completely verify that everything is soldered correctly. By far though the most common issue is that people do not completely cut through the traces on the PCB as shown in the guide. If these traces are not completely severed (no copper) then you will have this kind of issue.

iLackIQ

@yahmez

https://i.imgur.com/4E40qB1.jpg
https://i.imgur.com/YygmAy3.jpg

The diodes are facing the right ways, to make sure the mosfet or the switch board that I soldered to doesn't get shorted out by the USB/Ethernet board above it put electrical tape on them and I made sure it didn't make any pins/wires touch each other. I included a picture what how I cut the traces.