Black Screen then White Screen
- Sir_Holland
- Posts: 11
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Black Screen then White Screen
Hello, been lurking the hardware help section but not finding the problem I've been having.
Followed the build guide step by step testing plenty along the way. Thing is, now that I have everything together in the tin, when I go to boot from battery power I get a black screen. I know the screen is getting power because the backlight is on. If I press the start button at any time, the black screen goes white similar to the problem everyone is seeming to have with the white screen. Tested the setup off the battery through HDMI, everything runs perfectly.
What's strange, is that I actually had it running on the screen before moving on to the battery and sound card steps. Something to note however, it did take a little messing around with the screen ribbon cable before it did.
I've quadruple checked continuity between my pi and the pcb board, everything seems good. Battery is fully charged, getting the green light according to the micro lipo. I do have a couple questions though.
Is the green light on the pi for boot supposed to come on under battery power? It does when I plug a usb into the pi directly. If not, am I not getting enough power from the battery to the pi so it won't boot? If I plug a usb into the pi with the screen plugged in, it will not turn on, I am assuming that is because the micro lipo is hooked up?
I've been messing with the screen ribbon cable so much I'm starting to think it's not the issue.
Followed the build guide step by step testing plenty along the way. Thing is, now that I have everything together in the tin, when I go to boot from battery power I get a black screen. I know the screen is getting power because the backlight is on. If I press the start button at any time, the black screen goes white similar to the problem everyone is seeming to have with the white screen. Tested the setup off the battery through HDMI, everything runs perfectly.
What's strange, is that I actually had it running on the screen before moving on to the battery and sound card steps. Something to note however, it did take a little messing around with the screen ribbon cable before it did.
I've quadruple checked continuity between my pi and the pcb board, everything seems good. Battery is fully charged, getting the green light according to the micro lipo. I do have a couple questions though.
Is the green light on the pi for boot supposed to come on under battery power? It does when I plug a usb into the pi directly. If not, am I not getting enough power from the battery to the pi so it won't boot? If I plug a usb into the pi with the screen plugged in, it will not turn on, I am assuming that is because the micro lipo is hooked up?
I've been messing with the screen ribbon cable so much I'm starting to think it's not the issue.
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- Screen is actually on, backlight is on.
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- Holydohnut
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Re: Black Screen then White Screen
Do you have a multimeter? Check that the connection between the battery and the charge board is giving out around 4 volts, and do the same on the two cables coming from the charge board. It's hard to see, (as it's covered in glue?) but if you don't get a good battery to charge board connection, you won't get 4 volts at the output point.
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My first MintyPi
http://www.sudomod.com/forum/viewtopic.php?f=32&t=3466
The PiddlyPi! My first self build
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- Sir_Holland
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Re: Black Screen then White Screen
Didn't want to risk a short with everything so close together, lol!Holydohnut wrote: ↑Fri Aug 04, 2017 1:53 pmDo you have a multimeter? Check that the connection between the battery and the charge board is giving out around 4 volts, and do the same on the two cables coming from the charge board. It's hard to see, (as it's covered in glue?) but if you don't get a good battery to charge board connection, you won't get 4 volts at the output point.
I do have a multimeter, and just checked. getting a solid 4 volts from the battery to the charge board. Additionally, I am also getting 4 volts to the button PCB as well.
- Holydohnut
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Re: Black Screen then White Screen
Hmmm... If it works fine via battery over hdmi, but the additional load of the screen is preventing the pi from booting then there must be a drain or a short somewhere. Did you see this post that Helder put on? Wondering it that could be an issue? http://www.sudomod.com/forum/viewtopic.php?f=34&t=3504
Presumably the pi activity light comes on when powered by battery and output to hdmi?
Presumably the pi activity light comes on when powered by battery and output to hdmi?
My first GBZ
http://www.sudomod.com/forum/viewtopic.php?f=43&t=3475
My first MintyPi
http://www.sudomod.com/forum/viewtopic.php?f=32&t=3466
The PiddlyPi! My first self build
http://www.sudomod.com/forum/viewtopic.php?f=13&t=4171
Follow me on Instagram https://www.instagram.com/holydohnut/
http://www.sudomod.com/forum/viewtopic.php?f=43&t=3475
My first MintyPi
http://www.sudomod.com/forum/viewtopic.php?f=32&t=3466
The PiddlyPi! My first self build
http://www.sudomod.com/forum/viewtopic.php?f=13&t=4171
Follow me on Instagram https://www.instagram.com/holydohnut/
- Sir_Holland
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Re: Black Screen then White Screen
So, tried Helder's post with the ground wire, nothing changed. Tested continuity prior and there were no issues.Holydohnut wrote: ↑Fri Aug 04, 2017 3:17 pmHmmm... If it works fine via battery over hdmi, but the additional load of the screen is preventing the pi from booting then there must be a drain or a short somewhere. Did you see this post that Helder put on? Wondering it that could be an issue? http://www.sudomod.com/forum/viewtopic.php?f=34&t=3504
Presumably the pi activity light comes on when powered by battery and output to hdmi?
So I just tried your last suggestion. HDMI with battery, no boot. HDMI with USB plugged into pi... booted right up!
Pi is not getting power from the battery!
- Helder
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Re: Black Screen then White Screen
Sounds like you don't have a solid connection on the 5V GPIO if it's not being powered on by the battery, is the battery also fully charged?
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- Sir_Holland
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Re: Black Screen then White Screen
Battery is fully charged,
5v is showing continuity on nearly all of the test pads on the controller pcb.
- Helder
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Re: Black Screen then White Screen
5V GPIO (it's on the silk screen) has continuity to the Power Input VCC? does the 3.3V GPIO have continuity to the VCC under the 8pin connector? does that VCC under the 8pin have continuity to the VCC pad on the LCD board? Finally what is the voltage at on the VCC and GND pads on the lcd board?
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We will not support any cloned work so don't come to us with technical issues to resolve, go talk to the cloner for help.
Don't contact me about obtaining my board files (as you will not get them). If my Boards or PCB Kits are sold out, they will be restocked as soon as I can get them and there is demand for them. You can join the mailing list on my Website to be notified when they are available.
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We will not support any cloned work so don't come to us with technical issues to resolve, go talk to the cloner for help.
- Sir_Holland
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Re: Black Screen then White Screen
Yes, yes, and yes. Voltage is 2.55 on the LCD board between VCC and GND. I did run the wire between the GND on the controller PCB and the 2nd pin on the 8 pin as well.Helder wrote: ↑Fri Aug 04, 2017 4:58 pm5V GPIO (it's on the silk screen) has continuity to the Power Input VCC? does the 3.3V GPIO have continuity to the VCC under the 8pin connector? does that VCC under the 8pin have continuity to the VCC pad on the LCD board? Finally what is the voltage at on the VCC and GND pads on the lcd board?
- Helder
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Re: Black Screen then White Screen
Then there is your problem. It should be 3.28v or close to it. It might be a bad joint so reflow the pins on the 8pin connector and the first pin on the 18pin connector.
Chat with me and other members On Discord
Don't contact me about obtaining my board files (as you will not get them). If my Boards or PCB Kits are sold out, they will be restocked as soon as I can get them and there is demand for them. You can join the mailing list on my Website to be notified when they are available.
Helder's Game Tech Website
We will not support any cloned work so don't come to us with technical issues to resolve, go talk to the cloner for help.
Don't contact me about obtaining my board files (as you will not get them). If my Boards or PCB Kits are sold out, they will be restocked as soon as I can get them and there is demand for them. You can join the mailing list on my Website to be notified when they are available.
Helder's Game Tech Website
We will not support any cloned work so don't come to us with technical issues to resolve, go talk to the cloner for help.
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