Pi4 not bootting

[ali78fallah]

hi
my Pi4B worked fine until yesterday.
but when i try to connect it to A/V it can't boot.
i read very post in this forum but they can't help me.

i tried it with 4 SD Card (try with three 16 GB and one 2 GB SD Card)
i used some image file. (LibreElec, Ubuntu, NOOBs,..)
i tried with 3 Power Supply.
i have micro hdmi to hdmi that work fine.

i tried to change config.txt file and add some property but it didn't work at all.

it can't get ip from Ethernet cable.
when i attach mouse to it mouse led don't turn on.
i update EEPROM too.

when i connect it to monitor by HDMI it show rainbow screen and freeze.

i'm sure CPU don't run at all. because when LibreElec boot first time it add some folder to sd card.
but it not change now at all.

Without the SD Card: https://www.youtube.com/watch?v=7XVykx0ZkmY 12
With the SD Card: https://www.youtube.com/watch?v=rhHR9447hJs 12

[ali78fallah]

any idea?
maybe it broken?

[fruitoftheloom]

any idea?
maybe it broken?

https://www.raspberrypi.org/forums/view ... 28&t=58151

[ali78fallah]

thank u.
but i read that post.
i also tried to write SD Card with Windows, Linux and Mac osx but don't work

[pcmanbob]

I would try this.

First test your SD card using H2testW in windows to prove its not going faulty or a fake.

once you have a known good SD card use the new raspberry imager

https://www.raspberrypi.org/downloads/

and a USB SD card reader to write raspbian buster on to your SD card.

and use that to try booting your pi4.

[ali78fallah]

thank you
But it is strange to me that this happens suddenly
Everything worked before, Could something be broken?
my NanoPi M1 board work fine with these SD card maybe RPi4 has problem with them?
I will do your advice and write down the result.

[pcmanbob]

SD cards can go bad suddenly, my suggestion was just to cover all bases so your had the best chance of a working SD card.

Perhaps you could explain what you meant by this in more detail, exactly what you did and what you were connecting including power states of each item.

but when i try to connect it to A/V it can't boot.

[ali78fallah]

SD cards can go bad suddenly, my suggestion was just to cover all bases so your had the best chance of a working SD card.

Perhaps you could explain what you meant by this in more detail, exactly what you did and what you were connecting including power states of each item.

but when i try to connect it to A/V it can't boot.

i wanted connect RPi4 to our old TV.
so (without any change to config.txt) i connected it to TV with 1 to 3 cable but it didn't work.
i searched for it and found that i should change config.txt and add this line to it:
sdtv_mode = 2
i added it to config.txt
but it didn't work.

i found that i can add below lines to config.txt to get force output from hdmi and then i can use a HDMI to DVI converter and use my monitor instead of our old TV.
hdmi_force_hotplug=1
config_hdmi_boost=4
hdmi_group=2
hdmi_mode=4

i added them to config.txt and test it.
it showed rainbow screen for first time (before this when i connected RPI4 to my monitor it doesn't show any thing).
my monitor is 22inch and16:10 aspect ratio when i connected RPI4 to that it showed rainbow and then black screen and agian rainbow and then black screen (frequently).
it seems it want to load but it cant.

and then i understood that RPI4 can't boot from SD card at all.

[ali78fallah]

I previously connected my RPI4 into our 50-inch TV (with HDMI) and it worked (with LibreElec).
But now it shows the color screen (rainbow screen) too.

[pcmanbob]

One last question does any part of your pi get hot very quick if you power it up with nothing connected and no SD card ?

[ali78fallah]

One last question does any part of your pi get hot very quick if you power it up with nothing connected and no SD card ?

i tested it now
after 2 minutes it getting warm (no hot).
It seems to be normal.
i previously use my RPI4 for 10 hours (5 times for 2 hours) without any heat sink (for watching movie).
maybe this problem relation to that?

[fruitoftheloom]

SD cards can go bad suddenly, my suggestion was just to cover all bases so your had the best chance of a working SD card.

Perhaps you could explain what you meant by this in more detail, exactly what you did and what you were connecting including power states of each item.

but when i try to connect it to A/V it can't boot.

i wanted connect RPi4 to our old TV.
so (without any change to config.txt) i connected it to TV with 1 to 3 cable but it didn't work.
i searched for it and found that i should change config.txt and add this line to it:
sdtv_mode = 2
i added it to config.txt
but it didn't work.

i found that i can add below lines to config.txt to get force output from hdmi and then i can use a HDMI to DVI converter and use my monitor instead of our old TV.
hdmi_force_hotplug=1
config_hdmi_boost=4
hdmi_group=2
hdmi_mode=4

i added them to config.txt and test it.
it showed rainbow screen for first time (before this when i connected RPI4 to my monitor it doesn't show any thing).
my monitor is 22inch and16:10 aspect ratio when i connected RPI4 to that it showed rainbow and then black screen and agian rainbow and then black screen (frequently).
it seems it want to load but it cant.

and then i understood that RPI4 can't boot from SD card at all.

Regards A/ V you need a correctly wired TRRS4 AV Cable and set the correct parameters in config.txt:

https://www.raspberrypi.org/documentati ... t/video.md

Model-B-Plus-Audio-Video-Jack-Diagram.png (22.72 KiB) Viewed 392 times

[ali78fallah]

Regards A/ V you need a correctly wired TRRS4 AV Cable and set the correct parameters in config.txt:
https://www.raspberrypi.org/documentati ... t/video.md

thank you fruitoftheloom
but my RPI4 doesn't work now at all

[fruitoftheloom]

Regards A/ V you need a correctly wired TRRS4 AV Cable and set the correct parameters in config.txt:
https://www.raspberrypi.org/documentati ... t/video.md

thank you fruitoftheloom
but my RPI4 doesn't work now at all

3 power supplies, any one the Official PSU ?

If not what were the specifications ?

[ali78fallah]

Regards A/ V you need a correctly wired TRRS4 AV Cable and set the correct parameters in config.txt:
https://www.raspberrypi.org/documentati ... t/video.md

thank you fruitoftheloom
but my RPI4 doesn't work now at all

3 power supplies, any one the Official PSU ?

If not what were the specifications ?

no i don't use Official PSU.
i use this charger as PSU :
https://www.borofone.com/product/charge ... ith-cable/

but i tested my RPI4 with a 5v 2A and a 5v 1A but didn't change anything.

[pcmanbob]

Well your pi4B must have worked with one of them before, as you have used it to watch moves 5 times.
so with nothing connected and an SD card install with a working image you should still work and your second video does not show the red LED blinking so I think we have to accept at least one of the power supplies can power the pi4B.

I am beginning to thing that while attempting to connect you pi to one of the other displays you did something to damage it.

As it is not in a case could you have had something conductive under the pi while it was powered ?

[ali78fallah]

Well your pi4B must have worked with one of them before, as you have used it to watch moves 5 times.
so with nothing connected and an SD card install with a working image you should still work and your second video does not show the red LED blinking so I think we have to accept at least one of the power supplies can power the pi4B.

I am beginning to thing that while attempting to connect you pi to one of the other displays you did something to damage it.

As it is not in a case could you have had something conductive under the pi while it was powered ?

no. i tried to attention about this issue.
COVID19 Caused i cant buy a new SD to USB (SD reader) and test again.
but i tested it with macbook original SD reader and don't change any thing

[ali78fallah]

Well your pi4B must have worked with one of them before, as you have used it to watch moves 5 times.
so with nothing connected and an SD card install with a working image you should still work and your second video does not show the red LED blinking so I think we have to accept at least one of the power supplies can power the pi4B.

I am beginning to thing that while attempting to connect you pi to one of the other displays you did something to damage it.

As it is not in a case could you have had something conductive under the pi while it was powered ?

if occur any Connectivity maybe broken Raspberry pi?

[pcmanbob]

if occur any Connectivity maybe broken Raspberry pi?

Yes as the back of the PCB has lots of connections/voltages present , if you put the pi down on something conductive while its powered you could damage your pi.

its just another possibility , if the pi was not damaged by one of tour attempts to connect it to your old TV or monitor, as apart from trying a genuine raspberry pi PSU , you seem to have tried every thing else.

[FTrevorGowen]

...
If not what were the specifications ?

no i don't use Official PSU.
i use this charger as PSU :
https://www.borofone.com/product/charge ... ith-cable/

but i tested my RPI4 with a 5v 2A and a 5v 1A but didn't change anything.

Having followed your link above part of the spec. reads:

Code: Select all

2. Output: 3.6V-6.5V/3A, 6.6V-9V/2A, 9.1V-12V/1.5A, 18W

To me that implies that it might output >5V which, if that did happen, could have damaged your Pi.
Trev.

[ali78fallah]

Having followed your link above part of the spec. reads:

Code: Select all

2. Output: 3.6V-6.5V/3A, 6.6V-9V/2A, 9.1V-12V/1.5A, 18W

To me that implies that it might output >5V which, if that did happen, could have damaged your Pi.
Trev.

thank you.
is there any way to check it?
for example check the voltage of any gpio or other pin?

[ali78fallah]

if occur any Connectivity maybe broken Raspberry pi?

Yes as the back of the PCB has lots of connections/voltages present , if you put the pi down on something conductive while its powered you could damage your pi.

its just another possibility , if the pi was not damaged by one of tour attempts to connect it to your old TV or monitor, as apart from trying a genuine raspberry pi PSU , you seem to have tried every thing else.

dear pcmanbob
maybe it seems interesting that in second video (with SD card) when i connect RPI4 to the monitor via HDMI, it show rainbow screen after the Green LED completely turn off.
Is this normal?

[ali78fallah]

so there isn't any way to detect what heppen! is there?
i added uart_2ndstage=1 to config.txt to diagnostic and use gpio 14 and 15 for TX and RX.
but i didn't give any valid character so i connect GND together but there was another problem (blue LED on 'UART to USB' was turn on and it means data are transferring that wasn't correct)
i used dtoverlay=disable-bt for turn Bluetooth off to avoid interfere between them.

i also understood that bootcode_delay=5 work but boot_delay=5 doesn't work (it means nothing changes when i use boot_delay=5)

thank you for your help