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No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 3:45 am
by skyeg3
I got my pi 4 all hooked up with raspbian on the card and I have no output on my screen I got from amazon https://www.amazon.com/gp/product/B076G ... UTF8&psc=1

I have a solid red light on the pi... not sure what that means. I just installed raspian full on the card using balena etcher although I did not eject the card properly because it didnt show up on the computer.

Any ideas on what I should try next? Buying a new screen maybe??

Re: No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 3:52 am
by W. H. Heydt
The solid red light means it has power. Do you see anything from the green LED? That should blink as it accesses the SD card. And befor that, you should get a big square of colored areas. That's the VC6 self-test.

In the mean time, read the boot problem sticky, here: https://www.raspberrypi.org/forums/view ... 28&t=58151

Re: No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 5:23 am
by rpdom
All the fault finding info you should need is in the above mentioned sticky post.

For a Pi 4, the first test is to disconnect everything, remove the microSD card and power it up. The red light should come on and stay on. The green one should also light up and flash in a sequence of 4 flashes, then pause for 2-3 seconds, then repeat the flashes again. If that works it is a good indication that the Pi is good.

Unplug the power. Put the card back in the slot. Connect the monitor, keyboard, mouse, etc. and plug the power back in again. Make sure the micro HDMI cable for the screen is plugged into the socket nearest the USB-C Power socket.

That's a start. That and all the rest is in the sticky post.

Re: No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 5:25 am
by HawaiianPi
skyeg3 wrote:
Sun Jul 28, 2019 3:45 am
I got my pi 4 all hooked up with raspbian on the card and I have no output on my screen I got from amazon
Are you using HDMI-0 (the one closest to the USB-C power jack)? That's the default video port, and the one you should be using for a single monitor. Also, are you using a direct micro-HDMI to HDMI cable, or an adapter?

I just installed raspian full on the card using balena etcher although I did not eject the card properly because it didnt show up on the computer.
Etcher safely ejects the card for you when it finishes.

Any ideas on what I should try next? Buying a new screen maybe??
Try it on your TV, and make sure you have the correct HDMI input selected. For that matter, make sure you have the HDMI input selected on that monitor, and turn on the monitor or TV before you turn on the Pi.

Which version of Raspbian (did you get the latest one from the download site)?

What are you using for a power supply?

Re: No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 5:51 am
by skyeg3
It works! I had to move the screen to the one closest to the power... Thanks

Re: No screen action, red light on pi 4

Posted: Sun Jul 28, 2019 6:19 am
by W. H. Heydt
skyeg3 wrote:
Sun Jul 28, 2019 5:51 am
It works! I had to move the screen to the one closest to the power... Thanks
Congratulations.

And--just an FYI from my 'standard setup'--setting the "force hdmi" flag /boot/config.txt (which can be done from a PC) can help.

Re: No screen action, red light on pi 4

Posted: Wed Apr 15, 2020 9:56 am
by d1zzy
rpdom wrote:
Sun Jul 28, 2019 5:23 am
All the fault finding info you should need is in the above mentioned sticky post.

For a Pi 4, the first test is to disconnect everything, remove the microSD card and power it up. The red light should come on and stay on. The green one should also light up and flash in a sequence of 4 flashes, then pause for 2-3 seconds, then repeat the flashes again. If that works it is a good indication that the Pi is good.

Unplug the power. Put the card back in the slot. Connect the monitor, keyboard, mouse, etc. and plug the power back in again. Make sure the micro HDMI cable for the screen is plugged into the socket nearest the USB-C Power socket.

That's a start. That and all the rest is in the sticky post.
Hey there!

Can't seem to find a solution based on my scenario:

Everything has been working fine for months. Today I thought it would be fun to try to connect my Pi 4 to a TV, so I took out the headless server MicroSD, and tried to boot from a different MicroSD with a fresh Raspbian install. Couldn't get anything to display on my TV.

Put the headless server MicroSD back in, and reconnected all cables as before.

It starts to boot: green light flashes a couple times, red light turns on, network lights turn on but don't flash. Stuck like this (no green light flashing at all except for a couple times when plugging in the power).

I've tried:

- New MicroSD with headless install (same results as above)
- Unplugging everything (green light flashes 4 times)
- Recovery of eeprom (boots then green light flashes quickly, as it should)
- New MicroSD with Raspbian Desktop and HDMI to TV (no picture)
- Different power supplies (normally I use the official Raspberry Pi 4 power supply)

Any ideas? Since the eeprom recovery seems to get a good result it makes me think it _can_ read the SD, but since I can't get any HDMI output I don't really know how to troubleshoot further.

Thanks for any help!

Re: No screen action, red light on pi 4

Posted: Fri Apr 17, 2020 2:30 pm
by d1zzy
d1zzy wrote:
Wed Apr 15, 2020 9:56 am
rpdom wrote:
Sun Jul 28, 2019 5:23 am
All the fault finding info you should need is in the above mentioned sticky post.

For a Pi 4, the first test is to disconnect everything, remove the microSD card and power it up. The red light should come on and stay on. The green one should also light up and flash in a sequence of 4 flashes, then pause for 2-3 seconds, then repeat the flashes again. If that works it is a good indication that the Pi is good.

Unplug the power. Put the card back in the slot. Connect the monitor, keyboard, mouse, etc. and plug the power back in again. Make sure the micro HDMI cable for the screen is plugged into the socket nearest the USB-C Power socket.

That's a start. That and all the rest is in the sticky post.
Hey there!

Can't seem to find a solution based on my scenario:

Everything has been working fine for months. Today I thought it would be fun to try to connect my Pi 4 to a TV, so I took out the headless server MicroSD, and tried to boot from a different MicroSD with a fresh Raspbian install. Couldn't get anything to display on my TV.

Put the headless server MicroSD back in, and reconnected all cables as before.

It starts to boot: green light flashes a couple times, red light turns on, network lights turn on but don't flash. Stuck like this (no green light flashing at all except for a couple times when plugging in the power).

I've tried:

- New MicroSD with headless install (same results as above)
- Unplugging everything (green light flashes 4 times)
- Recovery of eeprom (boots then green light flashes quickly, as it should)
- New MicroSD with Raspbian Desktop and HDMI to TV (no picture)
- Different power supplies (normally I use the official Raspberry Pi 4 power supply)

Any ideas? Since the eeprom recovery seems to get a good result it makes me think it _can_ read the SD, but since I can't get any HDMI output I don't really know how to troubleshoot further.

Thanks for any help!
For others who may be as stupid as me, I will share the solution.

I spent days trying to troubleshoot, search and scour forums, tried everything! Finally my mind wandered back to what happened right before it stopped working, I tried to connect a micro HDMI cable, and so I checked for hardware damage.

That was it. Compared my board to a picture of the board online and looks like I scraped some bits off. Bought a new one (found a shop with 2 hour express delivery!) I'm back up and running. :) Stupid me.

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