Display problem - Samsung Galaxy A40 Questions & Answers

Hi,
So I changed the broken display to a40 with non-original (it was amoled I put ips). The phone works for one day and an update appeared, after downloading and restarting the phone it turned black and turned off. After many attempts to disconnect from the battery, disconnect the display, nothing worked, until I disconnected the display and turned on the phone (power + volume down). the cell phone restarted (no display). I turned off the cell phone by disconnecting the battery and reconnecting the display, after which the cell phone works again..
I make test: press button power +volume up for h. reset. Phone was brick again. I repeat procedure again with disconnect display, phone working again. It is very frustrated. I can't assembly complete phone because it brick again with new update or hard
reset.
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What is problem with display or android? I did factory reset, not help. Thanks for any kind suggestions.

Custom Rom installed?

No, everything software is original.

Related

Help please

Hi, hope someone can help. Baterry went dead whilst on a call, it was low. Tried to recharge through USB "device not recognised". Tried power and Orange LED comes on momentarily then phone cycles through booting. Sometimes you can see the boot screen other time just the vibration is felt. Tried soft reset hard reset every which way power on whilst connected, power off etc. Removed battery tried again, same. Left battery out for 30 minutes, same. It now appears to be stuck in bootloader screen and still cycling. How long does one have to leave the battery out? What else can I try???
Jerry rigged another destop charger so I could align the contacts and got some charge in the battery. Put it back in and charging normally, phone booted up as though nothing had happened. No hard reset evidence.

Is my phone done for? (Cant bot/charge/enter download mode/no response)

So few days ago my phone suddenly turned off and kept rebotting itself (It would reach the samsung galaxy logo and then turn off). I thought it was a battery issue so I removed it for 30mins and tried again, worked fine for an hour then problem started again. I left it over night to charge in the wall socket incase.
Same issue next morning and no solution.
I replaced the battery with a friends and the same issue happened on my phone (i used my battery on his and it works fine on his) so I removed the issue of battery itself.
That evening the phone then just stopped responding at all. It would not respond to pressing the power button (no load, no vibration).
Tried entering download mode using vol down + home + power. Nothing. (So cant use Odin)
Tried entering recovery mode using vol up + power. Nothing
Tried hard reset using vol up + power + home. Nothing.
(All the steps I used a fully charged battery from another s4 phone and removed/re-entered before trying again)
So I check online and notice some people having issues with power button, but even if that is the case - wouldn't my phone still charge? I dont even get the battery chargning icon on the screen when plugged in either PC or wall socket.
I opened it up and changed the motherboard with another samsung s4 and my original problem mobo still does not load on the new s4. (My new mobo worked on the old device though).
The ONLY response I got was when I used my original mobo on new s4 device and plugged it into PC, it popped connect and then disconnect sound and thats it (doesnt recognize usb port).
What are my options apart from getting another motherboard or going to a shop for a JTAG repair? I was contemplating just removing the power button and seeing if that helps in getting a charge response lol
Well your power button is broken for sure. Replace it and then test it.
Lennyz1988 said:
Well your power button is broken for sure. Replace it and then test it.
Click to expand...
Click to collapse
Wouldn't the phone still recognize charging even if the power button is faulty?
penguness said:
Wouldn't the phone still recognize charging even if the power button is faulty?
Click to expand...
Click to collapse
It always takes a few seconds before it starts to charge. So maybe the device reboots before reaching the charging phase. I'm guessing though. But since your problems started with power button issues it would be the logic place to start.
The part only costs a few dollars.
Well I'm exactly in the same situation as you, since this morning on a i9505 running JFLTPE-GPE 5.0 ROM. The screen appears for 1 second or 2 (Samsung logo) then it powers off . I need to remove the battery to try something else.
Same behaviour, even for recovery mode, so Odin is not an option.
I thought that changing some kernel settings have caused that, but as I just put them back to default values, it should not happen.
I didn't have some power button issues, it was just powered off at my wake up this morning. In your case, does your phone vibrate and power up instantly when you put the battery ? That's the case for me, but it should not be the normal.
My problem is actually solved : indeed, it was the power button. I removed all the screws and played a little with this power button (air dust, etc...), enough to make it start correctly !
I managed to do some backups, and now I hope that it won't break again.
Calicodesiles said:
My problem is actually solved : indeed, it was the power button. I removed all the screws and played a little with this power button (air dust, etc...), enough to make it start correctly !
I managed to do some backups, and now I hope that it won't break again.
Click to expand...
Click to collapse
Yeah, that happened before (automatically powering up, vibrating, going to samsung logo and then shutting down and doing it again until I removed battery - putting the battery back in with start it up without pressing the power button).
When it was in that phase, the one thing that did work was doing a soft reset (home+power+down vol, and then holding just power) - however that only worked for like an hour before it went back to the restart phase.
However now it doesn't respond to anything at all. (Any kind of response I got was when I put that mobo in another s4 and plugged in usb, which just gave a connected/disconnect sound on w7, no life on the phone itself).
Be very careful as to what you do, I suggest you do NOT leave the battery on it and charge it (which was the last thing I did before it went unresponsive) - my guess is phone went haywire trying to turn on/off continously.

Hard Bricked Samsung galaxy s7 edge

Hi! I managed to hard brick my galaxy s7 edge and i wanna see if someone here knows if its hard bricked or soft.
Got root and had renovate rom 2.0 ( n7 port) then i wiped my phone and flashed renovate 3.3 (s7 edge stock)
my phone worked fine on startup and i started to restore my old apps through gmail. i thought it would take a while so put my phone in my pocked and let it be fore about 20 minutes then when i took it up it was complete dead. i had about 67% before it died i tried everything (vol up down home all together) for at least 15+ sec. had it charge over the night ( i noticed that the phone didnt get warm or any leds shown) in the morning i tried everything again and nothing. when i connect my phone to my computer i hear the connect sound and then it disconnect a sec later. if i hold power button down and connect it ( and dont release power) my computer recognize it as onyx8890 and if i release powerbutton it disconnects. cant boot it in any way whatsoever. so what do you think? its only a week old thats the worst part of it!
I have left it to the store I bought it from for warrantable but its still rooted and have a rom on it. well if its complete dead they cant see if its rooted so thats one good thing.
still want to hear you opinion
sorry for bad english
so, from what I understand, u cant boot into any mode, are u even able to see something on screen? (logo, boot screen, etc.) U can try JIG (it somehow make any samsung device go to download mode). otherwise idk.
Hi guys, I have the same problem with my S7 Edge.
Can anyone help?
OK. So I managed to recover my phone.
The phone was dead because of a software crash(nothing on display, no LED light, power+vol. down for reset not working) and when connected to my PC - nothing (just a connect and after 1 sec. a disconnect sound).
But if I kept the power button pressed without letting go, my PC would detect the phone as exynos8890.
I tried to keep pressing the power+vol. down while connected to PC and I realized that the combo worked because after ~7 seconds the phone would disconnect and reconnect itself (but still as exynos8890).
But I tried a different approach. While connected to the PC I tried to keep on pressing power+vol. down. And I could hear that it disconnected and reconnected. But I did not let go of the buttons. And again a connect and disconnect. And again. And after literally 5 minutes of the buttons kept pressed down without letting go and countless reconnects there was finally a change. The disconnect sound was not heard after the connect sound. At that point I stopeed pressing the buttons and when I looked at the phone I could see that the battery icon appeared. Since the phone was connected to my PC, after 1 min. the battery started charging (it was charged 31%). And after that my phone booted fine.
wow
Hi I have just bought an s7 which turned out to be a Korean G930L but I cant get any response out if it apart from the 2 bottom leds and and the blue one. No response from trying to get into recovery or download mode, basically a black screen though it does vibrate on what i think is start up. It is found by pc and Odin and charges ok, I can tell as I can see properties on pc. But no other response. Is it possible that the previous owner tried to root it using non korean rom or TWRP? Any advice on how to fix either getting TWRP on or screen to light up. I am sorry for being so vague I have pulled it apart and checked all of the connections, screen, motherboard etc but nothing. Or chuck it out or put back on eBay. I tried your idea but it only booted once in that 5 minute period so I tried without it plugged in and rebooted several times but still no screen response.

Phone stopped working after drop

This problem occurred before too. After dropping it from my hand, the display went pure black/blank. Removed the battery, tried to turn it on. Holding down the power button causes the LED to light up(just as it does while turning on), vibrates a little bit but that's it. Nothing more . No sound, nothing.
I tried :
Accessing Recovery & Download mode
Hold down the power button for a minute with the battery removed
Called my number but it says turned off
Charge
Connect to PC
Note : This happened before but automatically got fixed after a few hours. But this time, it's the same after a day.
Took it to a service centre but they claimed that the display's broken and I've to pay 'bout $200 to replace it. But I really don't think display's the problem here cuz as I mentioned, it happened before and the phone's not working.

Google Nexus 10 - no reboot, no recovery

Hello,
i have this problem with Nexus 10.
I have found out that when i press "turn off" the screen goes black but the tablet doesn't really turn off. If i want to turn it on again i have to phisically open the tablet unplug the battery and plug it in.
Battery charges with no problem. Tried any advice on the internet and kept all buttons pressed at least 5 mins but no success.
I supposed it was a software problem so i tried to launch recovery mode or to hard reset the tablet but with no success: the display goes black and i have to do the trick.
Since i have nothing to lose what would you advice me to do to solve the problem?
Thanks,

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