My samsung A70's screen has gone black. I press the power button and it vibrates as it does when powering on and i see a splitsecond flash of samsung boot logo and then black screen . whenever i try to hard reset pressing the volume down and power button i see the samsung logo for a split second and then again black screen. one of these times i was hard resetting for a split sec i got image with the power off restart and emergency button on screen appearing .
I also have opened the phone after what happened(got all the right tools and have a good experience on changing parts on smartphones) and double checked that all connectors are connected good fully disassembled the phone and cleaned every part with isopropyl alchool 99,7 , checked under the microscope camera for any corrosion or blown cap/resistor/diode/bridge around the sub board where the screen's flex cable connects but in total i see no hardware issue .
Does any of you have any thoughts on what happened and give me a second opinion ?
Yeah probably water damage. It ain't visible most of the time, so there's a high chance you won't see it under microscope.
Have you tried using another motherboard? Just to check if it is the board that has an issue.
Related
Hi, I have a dropped MDA III. I Replaced the broken touch screen, now nothing works. No lights or screen, just gets hot when on charge. Won't hard reset and can't get into bootmode.
any ideas, apart from the bin?
rocketrobot said:
Hi, I have a dropped MDA III. I Replaced the broken touch screen, now nothing works. No lights or screen, just gets hot when on charge. Won't hard reset and can't get into bootmode.
any ideas, apart from the bin?
Click to expand...
Click to collapse
I don't think the dilithium crystals can take it any longer.
she canny take much more than this cap'n
Hi friend ,
please check follow this.
+ Power botton
+ Battery contact ( any cracked on it ??)
+ Re-solder flash and RAM, and power IC by hotgun
it can be rescued 65%
It can be
+
+
The first time I changed the tochscreen digitiser on my Orbit I had this. After much messing about I tried putting the cases back together without the power button in the case, and when I pressed the power button inside with my stylus it worked fine. The reason I tried this was because months before my power button was messing-about, working intermittently.
I tried fitting the button back in and re-assembling the cases but still the phone wouldn't come on. In the end I shaved about 1mm off the silicone press-pad on the back of the power button and it worked 1st time.
The phone is DInc CMDA Verizon completely stock with the most recent OTA update.
I replaced the front glass on my wife's phone after she dropped it. The phone was working fine, but the glass was beginning to shard out so I replaced it. Now the phone won't power on. All it will do is:
Illuminate the red light by the Verizon Logo if I put in the battery and plug in the charger
Make one short buzz when I press the power button (which also extinguishes the red light.)
I stripped the phone back down and re-seated all the cables and the result is the same. Any thoughts or suggestions?
Thanks.
Finally! Phone powers up, but the screen doesn't? How to get to media?
Well, the phone must have just need charging, because the LED has switched to green and it powers up ( I can get the soft keys to light up and occasionally the max volume sound will play if I spam the volume up key, but there is still no image on the LCD.
Is there any way to get to my data & pics on the phone?
The_B1G_JBZy said:
The phone is DInc CMDA Verizon completely stock with the most recent OTA update.
I replaced the front glass on my wife's phone after she dropped it. The phone was working fine, but the glass was beginning to shard out so I replaced it. Now the phone won't power on. All it will do is:
Illuminate the red light by the Verizon Logo if I put in the battery and plug in the charger
Make one short buzz when I press the power button (which also extinguishes the red light.)
I stripped the phone back down and re-seated all the cables and the result is the same. Any thoughts or suggestions?
Thanks.
Click to expand...
Click to collapse
I dropped my HOX and I got another HOX with working mainboard. I replaced it and everything worked except for very faint backlight and flickering. So I disassembled the phone and put it back together again. Now I can't start the phone anymore and the solid red led burns when connected to the charger....after I connect it it flickers one time, very fast. Does anyone have an idea what it could be? So pissed of right now...
Hi, if you don't have any power at all eg no vibration or lights on three bottons at the bottom, it could be that the power connecter is not properly plugged in. follow cabble down from power button, plug is hard to get at unless you unstick power button from cassie.
If you have some power check lcd is working by using a bright light near the screen and closely checking to see if you can see anything, could be backlight not working.
just my 2cents
feel bad for ya!
bevan1971 said:
Hi, if you don't have any power at all eg no vibration or lights on three bottons at the bottom, it could be that the power connecter is not properly plugged in. follow cabble down from power button, plug is hard to get at unless you unstick power button from cassie.
If you have some power check lcd is working by using a bright light near the screen and closely checking to see if you can see anything, could be backlight not working.
just my 2cents
feel bad for ya!
Click to expand...
Click to collapse
The cable is connected and I'm afraid the display shows nothing Thanks for your reply.
This might work
_JT said:
I dropped my HOX and I got another HOX with working mainboard. I replaced it and everything worked except for very faint backlight and flickering. So I disassembled the phone and put it back together again. Now I can't start the phone anymore and the solid red led burns when connected to the charger....after I connect it it flickers one time, very fast. Does anyone have an idea what it could be? So pissed of right now...
Click to expand...
Click to collapse
Okay, I have experienced the same thing and I'll tell you what I did to fix it. I dropped my HOX after owning for only a few days and the screen was cracked. I ordered a replacement LCD/ screen digitizer part and took it apart. One of the things that I found was that there was adhesive everywhere, including adhesive on the connection to the battery.
After it was taken apart, I attempted to test the new screen. It was then the LED turned solid red and the phone would not power on (even after 10 minutes of charging). What I did was remove the adhesive from he battery connector and disconnected the battery completely. I plugged it back in 10 seconds later and it turned back to flashing green (which is normal because I had several missed texts).
So my solution was just to unplug the battery and it worked just fine. The hardest part about this whole process was putting the cover back on, especially on the side with volume buttons! Hope that helps.
I have exactly the same problem. The difference is that now that I took it off charge, the red light is flickering on and off. I cannot get the display to show! Please please help.
So here's how it went:
I opened the phone, replaced the port (the small boardlike thing)
assembled my phone to try it.
The phone started
Then I put all the screws and sim card But I didnt get signal no matter how long I waited
So I dissassembled it again. I was a bit harsh and broke the "Power" button. (the rubber thing that makes it bounce fell off, and an small metallic circle that probably completes the circuit fell off as well.
(Google "galaxy note 2 charger port" for a picture, cant post external links @[email protected])
Checked everything was plugged properly and tried to start it with the tip of a paper clip to complete the circuit where the power button should be (that small round thing)
Nothing happened so I googled a method to start it without using the powerbutton:
youtube: Gre9qaJyCZw
Basically its to plug the charger, wait for the battery logo to show, unplug, take out the battery and put it back in quickly.
So I assembled the phone again to try that and when I connect it to charge it the screen flashes for half a second (no words no nothing, it just brightens up for a bit) And then the red led that means its charging turns on after a couple of seconds.
After doing the trick, the led turns on blue....then the phone vibrates a bit(seems its starting up, but with no sound or nothing in the screen)
And then the "menu" soft key blinks a couple of times and then back to nothing
So I just have no idea what to do @[email protected] I dont mind replacing the button but I would rather not spend on it if there's something else wrong with the phone...any ideas?
And I just bought this to replace another phone that broke ;_;
EDIT::::::
I replaced the charger port for the old one and tried the starting trick. but to the same result: after doing the trick, the led turns on blue....then the phone vibrates a bit(seems its starting up, but with no sound or nothing in the screen)
And then the "menu" soft key blinks a couple of times and then back to nothing
Shmendrich said:
So here's how it went:
I opened the phone, replaced the port (the small boardlike thing)
assembled my phone to try it.
The phone started
Then I put all the screws and sim card But I didnt get signal no matter how long I waited
So I dissassembled it again. I was a bit harsh and broke the "Power" button. (the rubber thing that makes it bounce fell off, and an small metallic circle that probably completes the circuit fell off as well.
(Google "galaxy note 2 charger port" for a picture, cant post external links @[email protected])
Checked everything was plugged properly and tried to start it with the tip of a paper clip to complete the circuit where the power button should be (that small round thing)
Nothing happened so I googled a method to start it without using the powerbutton:
youtube: Gre9qaJyCZw
Basically its to plug the charger, wait for the battery logo to show, unplug, take out the battery and put it back in quickly.
So I assembled the phone again to try that and when I connect it to charge it the screen flashes for half a second (no words no nothing, it just brightens up for a bit) And then the red led that means its charging turns on after a couple of seconds.
After doing the trick, the led turns on blue....then the phone vibrates a bit(seems its starting up, but with no sound or nothing in the screen)
And then the "menu" soft key blinks a couple of times and then back to nothing
So I just have no idea what to do @[email protected] I dont mind replacing the button but I would rather not spend on it if there's something else wrong with the phone...any ideas?
And I just bought this to replace another phone that broke ;_;
EDIT::::::
I replaced the charger port for the old one and tried the starting trick. What happened now is that after doing the trick, the led turns on blue....then the phone vibrates a bit(seems its starting up, but with no sound or nothing in the screen)
And then the "menu" soft key blinks a couple of times and then back to nothing
Click to expand...
Click to collapse
you probably messed up the mainboard or some connections.
Try to power it on with microusb board disconnected.
Make sure every single connection to the main board is connected properly
yaro666 said:
you probably messed up the mainboard or some connections.
Try to power it on with microusb board disconnected.
Make sure every single connection to the main board is connected properly
Click to expand...
Click to collapse
Any suggestion as to how I can start the phone with the power button broken and without the microusb board?
I already checked all the connections that you can see when replacing the microusb board (the back side of the motherboard) Is there connections worth checking in the front?
Do those symptoms sound familiar for any specific problems? (Like non working screen or motherboard)
- Charging takes a couple of seconds to turn on the red led when connected but shows nothing on the screen.
- Trying to start it with taking out the battery trick makes the led turn blue, then the phone vibrates a bit, then the menu soft key flashes a couple of times.
Update: I found 2 more symptoms
1° Kept restarting the phone with the battery trick, and a couple of times I could hear the music of the phone starting up, but it seems to be at random or due to some factor I have not spotted yet
2° If I connect it to the computer it detects the phone and lets me access the files. Kies detects it as well
If phone can be accessed through kies I think you have broken some connection between logic board.
Power button and volume + - buttons should have the same round metal part, which will work after swapping.
I think you should give up, maybe there is still hope for repair.
yaro666 said:
If phone can be accessed through kies I think you have broken some connection between logic board.
Power button and volume + - buttons should have the same round metal part, which will work after swapping.
I think you should give up, maybe there is still hope for repair.
Click to expand...
Click to collapse
Thats the weird thing. if you take a look at that phone's board, the only things that are within "breakable" range when you open it with a plastic tool are:
power button
charger port
earphones port
volume buttons
And they all seem fine except for the power button. there's no other flexors or anything even remotely close to where the tool was used. (and where I got a bit rough)
I replaced a cracked screen a few weeks ago. I didn't put the new screen in flush at the bottom, slight gap and as a result the new screen cracked from pressing pressure. The screen still worked but cracks got worse over time.
Also the screen would freeze now and again for a minute or so then back to working again.
Now the screen goes dead and the charging led blinks with cable in and the phone vibrates every 3 seconds or so in a permanent loop with charging cable in?
Any ideas what's damaged and if it's fixable?