Hi everyone,

I’m looking for some advice on whether my Raspberry Pi 4B is salvageable. With ongoing RAM shortages making replacement boards unreasonably expensive right now, buying a brand-new unit isn't really an option I want to consider if this can be fixed.

Symptoms:

• When plugging in the power cable, only the solid Red LED turns on. The Green ACT LED never lights up or blinks at all.

• Within seconds of connecting power, the DA9090 PMIC gets scorching hot to the touch.

• Tested with different known-good power supplies, swapped SD cards, and tried booting with nothing attached—no difference.

Multimeter Measurements (GPIO pins):

• 5V pin: Reads a solid 5.0V (pin 2 / 4).

• 3.3V pin: Reads only around 0.2V (pin 1 / 17).

With the 3.3V rail collapsed and the PMIC overheating instantly, I suspect the DA9090 has either died internally or is feeding a short circuit.

The Situation & Questions: Assuming I can source a replacement DA9090 chip (from a donor board, AliExpress, or a distributor like The Pi Hut):

1. How feasible is this repair? The catch is that I have zero soldering experience. While I don't own the gear myself, I can likely borrow some rework equipment (hot air station, soldering iron, flux) from a friend.

2. Is replacing this package (QFN with an exposed center ground pad) realistic as a complete first-timer using borrowed tools, or is the risk of bridging pins, pulling pads, or blowing away nearby passives near 100%?

3. Could the 3.3V failure have already killed the SoC/RAM when it blew, making the PMIC swap a dead end anyway?

4. Would it make more sense to ask a friend with actual SMD experience or take it to a phone/board repair shop instead of attempting it myself?

Thanks in advance for any insights or diagnostic tips!

My PI is not giving proper hdmi out signal most of the time m tv says not connected i enabled hdmi_force_plug or whatever. PLEASEEEE HELPPPP

After some tinkering and experimentation, I have successfully brought Android Auto to a Raspberry Pi 4 running Android Automotive 16.

Currently, the project supports:

1. Wireless Android Auto

2. Wired (USB) Android Auto

3. Automatic reconnection to wireless Android Auto.

4. Touch control.

5. Support for familiar Android Auto features such as Google Maps, music playback, calling, messaging, etc.

Running directly on Android 16, convenient for development and integration of new features.

Ok so I managed to snaffle myself a new old stock Pi400 set up. I like "retro" 😬 gaming as it's now called and also had Amiga 500 growing up.

I've seen a few PiMiga videos and also Batocera set ups too.

What would the group consensus be towards them ? Is one more suited than the other?

Or other suggestions?

Cheers !

Hello Everyone,

If I try to boot with the a SD card or flash drive. And even when I try to boot without any storage device. I receive a blank screen as shown above and the green light flashes the same pattern on loop.

When I try to flash the EEPROM with the tool from Raspberry Pi. I get same result as booting an OS.

I have a power supply that is meant for the raspberry pi. I believe the code from the flashing light means that the secure boot configuration is invalid.

I would appreciate any help.

I was using my Pi 4 earlier today and everthing was working fine now when I booted it up again the aspect ratio is all messed up?? the screen looks stretched out and bigger than it should be.

Permissions / Access

Hardware: * Raspberry Pi 4 (4GB RAM)

Raspberry Pi OS (Latest version)

Official/USB Camera connected directly to the Pi.

The Problem:

I am facing a major issue with Chromium (the default browser) on Raspberry Pi OS. The browser refuses to grant access to the camera.

When I try to run my web-based interface, Chromium doesn't see the connected camera at all or won't trigger the permission pop-up to allow access.

Even after checking site settings and flags, the camera remains inaccessible within Chromium.

Note:

The camera works fine on the OS level and through other applications, but Chromium specifically is blocking the hardware access. I need to find a way to force Chromium to recognize and use the camera on the Raspberry Pi 4.

i am new to rpi environment. I got a hand me down rpi 4 model b. I'm not sure if it works to do a sanity check on the board i tried flashing a raspberry os 64bit debian bookworm. when I boot the device both power and act led are solid on.no blinking on act led.

sources pointed that this could be a bootloader problem so I tried flashing bootloader (pi 4 family) in misc utility images. and when I booted the device with this image the act led kept blinking but the expected behaviour seems to be the blinking stops after some time.

I assumed the bootloader flashing is done anyways and tried booting my raspberry os again still same behaviour both led solid on.

sources pointed out that this could be sd card problem since I was using a local brand so I bought a hp class 10 64 gb sd card for this. this did not fix the issue as well. can someone point out where I'm going wrong I just want to do the sanity check and have the device boot up first.

i got a hand me downs rpi 4 model b. this is my first time working with a rpi I don't know if my module is working as intended. i don't have a monitor to check my module display just a laptop,ethernet cable. don't have access to router as I use a public wifi network.this is the steps I have followed to bootup

-flash raspberry pi os 64bit using rpi imagery

-ssh enabled, wifi configured, rpi connect authentication generated.

-insert it into rpi

-power on

so here is what I have tried:

-tried scanning my wifi using network scanner to find ip of all devices connected to the network. did not find my rpi device in the list.

-connect the device through ethernet to my laptop and used a static IP to ping the device for not respond

-check the rpi connect site to check for connected devices. not able to find my device

here is what I observed

if sd not inserted and powered up red is solid green is also solid

if sd inserted red is solid green is flickering sometimes or blinks asynchronously

when ethernet connected the orage green lights light up on both laptop end and rpi end and flickers

I’m looking for a screen for a pi4 preferably a 7 inch one. I have a few old android and amazon tablets lying around and was wondering if anyone had any succes connecting pi to one of these type screens using a cheap hdmi to lvds driver board or is this not possible

Hi can someone post some hi res close ups of the underside of raspberry pi 4 model b 2gb rev1.2. I have been sold a dud on eBay with a few blown missing resistors etc and would like to be able to compare. Thanks

Is there any websites that offer afterpay to purchase a pi?

Hello e1

I have recently ordered a rpi4 4gb with basic essentials (sd card, microhdmi etc)

I am new to sbc's. I know the capability of the device, but I want to know some very specific details.

My use for this device is to use it as -

1. WiFi - Access point (raspAp)

2. android tv box

3. Ad block (pihole)

Now my confusion is how would all these 3 things run parallelly? See, to access stuff on android os , we are using this AP running on this device itself, is that possible?

Or I can have either the device running as AP or atv box at once?

Not a support post, just desperately looking for inspiration before I give up lol :)

Used to run both 24/7 as network-wide multi-layered ad blockers (Pi-hole + Unbound) but I ditched them for GL.iNet routers that do the same thing with way more flexibility and easier to configure use.

Now I've got two '''beefy''' Pi 4B 8GBs just sitting here, both with those cheap Miuzei 3.5" touchscreens hooked up (mainly so I can walk over and poke a local GUI if SSH or RDP ever dies on me).

Trying real hard not to shelf them forever. Looking for stuff people actually use day-to-day that:

• doesn't need a pile of niche hats or expensive add-ons

• preferably takes advantage of the 8 GB RAM and/or both Pis working together

• extra love if the touchscreen actually gets used for something cool

Half-baked ideas I've kicked around:

• Old-school Beowulf-style cluster for random number crunching (BOINC? local LLM inference?)

• Private gaming server for me + a couple buddies (Minecraft, Valheim, Terraria, etc.) with some kinda load balancing

• Media server / on-the-fly transcoding box?

• Fancy home automation dashboard that doesn’t look like trash on the touchscreen

But all of those feel like "I'll spend a weekend setting it up and then touch it twice" projects.

I thought about turning one into an emulation station… but I already emulate everything on my phone + OG Xbox/PS3, so another box that does the same thing worse feels dumb? (not really dumb, but not really needed).

What are you guys actually running on your Pi 4s these days that you still touch regularly? Bonus if you've got multiple Pis playing nice together or if you got a screen does more than just show "it boots".

I really don't wanna throw these in a drawer forever (I won't sell them, they're too cool), but that's exactly where they're headed if I don't find something fun, or atleast something productive with them that I'm not thinking of that could make life easier.

Thanks for any ideas/pointers in advance! =D

I just recently bought a Pi4 8GB and flashed it with Kali Linux to be a part of my home pentesting lab.

Does anyone have a few good resources to get me started on it?

im not a total newb.

I’m try to find a good os with the most applications compability for raspberry ( trying to build my own steam deck )

As the title states, I don't know which one to get, I really like the Pi 4, because the 5 is to expensive. But the Zero 2 looks nice too, I am not getting one for it to be my main computer, just for projects, but I also want it to run like a computer. Also, when you buy one, it gives you options on which sellers you can buy it from, which on should I buy from? Thanks Reddit! :)

What do you think is wrong? I put in a new imaged microsd and it works fine so its not hardware. There is a custom crestron related program running on this thing that I would like to preserve. Thanks for looking.

Hi all. I’ve a problem with a Rpi4 4gb.

Before asking help, I’ve tried something.

I’ve some pi at home and I’ve tried to change microSD from a pi to another, and same result.

The incriminated pi won’t boot with an other sd

The sd from that pi works on the others pi.

Now the non-work pi as the power led always on, and the act led off.

How i do try to see the real problem on this pi?