black screen after falling down - Google Pixel 4a 5G Questions & Answers

Hi,
My Pixel 4a5g fell on a carpet. No external damage is visible, but the screen still does not turn on. Also no LED when charging.
I have read a few times that this is a known problem and that the display is broken internally. I would order a new display from iFixit and change it if I knew for sure it was because of this.
Is there any way I can test if the phone itself still works, but just the display doesn't show anything? Would it give any sign when connected to the computer?
Translated with DeepL

It could be a loose connector(s).
Could be the mobo, battery and/or display was damaged. Inspect and go from there.
Always use a good case to protect the phone for high G loads from drops.

Related

X1 felt down --> no display

Hey
A friend of mine called me yesterday if I wanna buy his broken X1 (it felt down :/) and repair it, because I'm the man for such jobs
Do you think it's only the LCD-flex-cable or another repairable damage?
I think I can get that device for 2-3 days and then decide if I buy it...
Some ideas? Is there any chance to repair it?
Thanx, Carbon
yes, probably even a loose connector on flex cable
Hello,
I am quite certain it is an easy problem, i have seen many x1 phones with just a minor loose connector which causes the screen not to respond.
The best way to check it if it really is just the screen/flex cable is to turn it on, and check if the side lights flash in all colors.
If that works the phone should work normally. (even if the screen doesn't work)
After opening:
Re-insert all the cables in the screen flex cable and check if it works..
if that doesn't work then replace the flex cable.
If the screen works:
Then check out the screen if it has any crack's or black spots.
In that case you will have to replace the screen/touch screen also.
Generally, if there is no physical damage to the LCD itself and the phone buzzes on startup with all appropriate sounds - replace the flex. Flashing lights are attached to the flex and are positioned ABOVE the LCD on flex connection, therefore will not light up if the flex is damaged and neither will the upper keypad and other less obvious things.
The flex replacement is not minor, just be aware of that. Bad falls are also the reason for main PCB damage, in which case there will be nothing you can do.
Thank you so much
It was a "very short" call by this friend, but when i take the device, I want a precise report what happened...
atm I don't now if the sidelights show reaction, but I will report
I'm afraid of a real PCB damage...
In flex problem side lights will not light up, as i mentioned, they are positioned above the Lcd connection, so if the main flex connection ribbon is damaged, as is most often the case, all of the upper level functions will be gone, but you will get a startup with buzz and sounds present.
I got it
And LEDs are flashing and you can start it complete normally, but you see nothing... i'm going to open it and check the Flexcable
Carbon386 said:
I got it
And LEDs are flashing and you can start it complete normally, but you see nothing... i'm going to open it and check the Flexcable
Click to expand...
Click to collapse
Best of luck.

Red LED flashing: bootloader bricked, hardware fault, or a write-off

Hi all,
Last weekend I tried to fix the GPS on my Xperia Z (C6603) - it couldn't lock any satellite and according to all tests it was a hardware problem. When I opened the back cover I saw that the GPS antenna wasn't securely attached anymore (thanks to the third party who replaced my screen last summer I guess). While I was at it, I also wanted to check the speaker since the volume is generally quite low. Doing so I had some difficulty getting the battery out but it didn't look like anything was damaged by it.
I fixed the GPS antenna and reassembled the phone, but now it won't boot anymore...
When I try to boot it the LED blinks red three times and then stops. Nothing more. It only seldomly responds to a cold reset (vol up + power for 10 sec.) but mostly not. When I connect it to the wall socket or laptop the LED burns red continuously.
When I opened the phone I still had about 70% battery left so that should be fine. Nevertheless I've had it on a charger overnight (LED continuously red) and tried the next morning without success.
What I have found is that the red LED indicates either a broken bootloader or a hardware fault. Since it occurred after I opened the phone I would assume the latter.
I have managed to do a repair through the PC Companion software but without result. I can still get the phone in fastboot (LED turns blue) connected to my laptop to flash. The screen doesn't turn on, though I'm not sure if it should? I'm also not sure if being able to connect in fastboot excludes hardware failure?
I haven't tried to root/flash because I first want to ask for some advice on a more systematic approach to fixing it. Also, tonight I will pick up a friend's Xperia Z with a broken screen for spare parts (same model, he got it one month later). So except for the screen I have working replacement parts. Besides the screen replacement (with original Sony parts) the phone was still in original state both in hard- and software.
I would really like to fix the phone since I liked it and I'm stuck to a SIM-only plan until December still. Third-party repair is out of the question because of costs; then I'd rather spend it on a new XZ5.
Any ideas on how I should approach this?
After some trial and error, I have managed to flash a stock ROM (.253) on it. No luck with that unfortunately. When I try to turn it on, there is a small vibration after a few seconds and that's it. Again the phone responds to a cold reset, but when I try to boot it after the LED blinks red three times again. That's all it does.
I would say the only thing to still try now is swapping the motherboard with the other phone, not? Or are there any other suggestions?
Well, I would assume that it is a hardware problem, especially taking in to the account that you touched components inside.
Even if we all know how phone work, and where are all components are, its not recommended to touch anything inside if you dont have steady hand and environment to make any repair(clean place, no humidity, clean hands).
One bad plugged connector can brick your phone. One time I even had problem on other phone with really small rust on one pin that I touched with finger(sweat from it+time+really crappy weather where I had to use it), so it show how actually fragile phones are.
But few questions, when you managed to flash rom, you get all that android logo when you are in flashmode, and it show everything(loading bar etc) on screen?
Im asking because first symptom of bad battery connection is deformed or totally dead screen.
When you fixed gps antenna(that black plastic on top near camera) you used any tool that could damage board? its near microUSB so its easy to mess those small pins and make short circuit.
The same with battery, you could try to squeeze/move it a bit to see if there is any changes in phone boot behavior(not to gentle way to check it but sometimes it show if there is a problem)
Before changing motherboard I would replace battery from your other phone(charged before that) and check all pins on connector and board near it if there is any problem.
But as I said it should be made really delicate and in appropriate conditions.
Sadly I cant really help with it beside that, and I hope your phone gonna stand up after that somehow :/
Thanks for the reply Akinaro. Indeed the conditions are not ideal. At least I have one of those repair tool kits with the small screwdrivers, plastic pick and plastic levers for the connectors. I'll also set a reminder to take some latex/nitril gloves from the lab for next time
But few questions, when you managed to flash rom, you get all that android logo when you are in flashmode, and it show everything(loading bar etc) on screen?
Im asking because first symptom of bad battery connection is deformed or totally dead screen.
Click to expand...
Click to collapse
No, the screen is totally dead. No sign of life whatsoever.
When you fixed gps antenna(that black plastic on top near camera) you used any tool that could damage board? its near microUSB so its easy to mess those small pins and make short circuit.
The same with battery, you could try to squeeze/move it a bit to see if there is any changes in phone boot behavior(not to gentle way to check it but sometimes it show if there is a problem)
Click to expand...
Click to collapse
Possibly. I have used both the screwdriver and the plastic tools, but fiddling everything back in was tricky. The battery was disconnected though so it shouldn't have short-circuited. I will try with moving around the battery. But the more I think of it, the more I start thinking that I screwed up the motherboard by touching something there.
Before changing motherboard I would replace battery from your other phone(charged before that) and check all pins on connector and board near it if there is any problem.
But as I said it should be made really delicate and in appropriate conditions.
Click to expand...
Click to collapse
I have tried the other battery last night as well. I didn't charge it first though, I left it in my phone to charge overnight and tried to boot it this morning, without result.
So I've attempted to swap the motherboards. Good and bad news...
The good news is that the spare phone works with every combination of motherboard and battery, so neither of those is the culprit. The bad news: none of the combinations work on my own phone, even with swapping all the other hardware components (camera's, gps, antenna etc.).
On the other hand, by now the LED doesn't turn red anymore. The phone just stays completely off. I didn't have time to try and charge it for some time though, so I'm not sure if it's a good or a bad sign.
I fear that the main multiconnector running under the battery might be damaged when I took out the battery and antenna module the first time. That is the only component that I cannot swap for it is so integrated - it would mean swapping the screen to the spare-parts-phone and using that one.
Any ideas still before I should consider it a write-off completely?

Nexus 5 Display not working. Don't know what to replace.

So, I was trying to replace my Nexus 5s camera and I disassembled the main motherboard. Replaced my camera and everything but after I reassembled the phone, I found out that there's no display. The LEDs work fine, because I see them light up and I see that the screen is black but it's a bright black and the screen is on. So after tampering with it, I found that the little USB charger port wire board wire thst connects just above the battery (idk how to describe it, its the orange strip that locks the battery in place) had a direct correlation with the display. If I unplugged it, the screen would go dark and off. If I replugged it, it would be on again. After doing this a few times, I actually got my phone's display to show for a little while before it went away to black again. So will buying a new orange strip part work or would I have to go to the bottom where the little screen digitizer is? I'm sorry if the problem is unclear because I really don't know how to say it or explain any better. Please help.

problem with replacing display on sony xperia z5 compact

The display on my Z5 Compact recently went haywire; it wasn't physically broken and the touch functionality still worked, but the display was unusable (colors out of whack, wavy patterns, zig-zags, etc.). I bought a replacement display, but after I installed it I can't get the device to come on. I can charge it and the red charging light comes on, but even after leaving it for a few hours I don't get anything. When it's charging, I do see something inside the phone light up bright white from time to time, but nothing on the display. If I let it charge and then try to power on the device, the screen will go from black to gray, but that's all I get. As far as I can tell I've got everything connected back properly, the only thing I'm not sure of is that part of the bridge over the ZIF connector for the display broke off; are there conductors in that? (I have a screenshot showing what I'm talking about, but I don't see a way to upload a local image.) The connector lock still seems to work fine. Any suggestions?

P30 Pro Water Damage

So I went of vacation... used phone while snorkeling... now screen doesn't turn on. What I need help with is i can feel phone vibrate when connected to PC. I just want to extract all my saved pictures and videos. Any help would be greatly appreciated.
Prophecy650 said:
So I went of vacation... used phone while snorkeling... now screen doesn't turn on. What I need help with is i can feel phone vibrate when connected to PC. I just want to extract all my saved pictures and videos. Any help would be greatly appreciated.
Click to expand...
Click to collapse
As said by every manufacturer, phone can resist underwater at 1 meter, but in tap water and without pushing buttons.
You have placed the phone in salted water (high dangerous for rubber O-rings and glue) and you also took pictuers (if you had snorkeling to record videos or shoot fishes).
Than, if the phone is dry and screen won't turn on, you'll have to repair it but your warranty is avoided.
Good luck.
Happened to me...
I don't know if it was due to heat, but the back panel seemed to be unglued at the top.
I think it was what caused the issue, as I just put my phone in the water few seconds and max 30cm deep down.
The display started to flicker and ended up being all black in few days.
Watch for any openings around the phone.
I just want to be able to get my videos and photos back. It turns on and vibrates when I connect to pc, but I can't see the screen to allow pc data transfer.
Prophecy650 said:
I just want to be able to get my videos and photos back. It turns on and vibrates when I connect to pc, but I can't see the screen to allow pc data transfer.
Click to expand...
Click to collapse
Did you wash the salt off with fresh water afterwards? Salt will be causing problems on it's own, good chance you've permanently fried the phone though
If you can connect it to hi-suite and then unlock your phone (assuming pin certification etc.) then there's a screen mirror function in hi-suite which should allow you to do it. This is, of course, based on the assumption that the only issue your phone has is the borked screen and not more damage.
Attached is a picture of the initial lock screen keypad position to assist in trying to unlock the phone.
Snorkeling case is like $50 on Amazon for future reference
https://www.amazon.co.uk/Huawei-Snorkel-Case-P30-Pro/dp/B07R1QJWKW

Categories

Resources