SM-T800 display issue after charging - Galaxy Tab S Q&A, Help & Troubleshooting

Hello everybody
it happens suddenly, for no reason, on a resurrection remix rom which worked fine for years: after a charge, my display started working erratically (working/not working, twinkle?randomly... i don't know the exact english term).
Just in case, i changed of rom and switched to the official lineage rom here:
https://forum.xda-developers.com/galaxy-tab-s/development/rom-lineageos-14-1-sm-t800-t3545080
i followed all the procedure but nothing changed after that, my display acting still erratically.
When i boot, i have the "kernel is not seandroid enforcing" message on top/left before booting into the lineage rom, i don't know what does it mean and if it could be related to my display issue. i don't remember if it was there when i had the previews rom though....
Could it be a kernel issue?
i looked to this thread:
https://forum.xda-developers.com/galaxy-tab-s/help/tab-s-8-4-wifi-6-0-1-update-restarts-t3465133
but my problem seems different, since i have display issue (randomly!) even where i am start booting (when we see the samsung logo for exemple).
i tried the battery trick, i even bought a new one ;p, but it changes nothing :/
At this point, i don't know if it is finally a software or a hardware issue....
i am open to any suggestion, a link, an assistance in that matter would be greatly appreciated!
thank you
kind regards from France

The number 1 reason for flickering display on the S1 is loose battery connection, this affects the T7** a lot more than the T8** make sure the connector is soldered firmly to the motherboard and the plug half has a tight fit on all the pins, some solder the battery directly to the motherboard to fix the problem.

Tinderbox (UK) said:
The number 1 reason for flickering display on the S1 is loose battery connection, this affects the T7** a lot more than the T8** make sure the connector is soldered firmly to the motherboard and the plug half has a tight fit on all the pins, some solder the battery directly to the motherboard to fix the problem.
Click to expand...
Click to collapse
Thank you Tinderbox for your reply!
Somehow, i don't think it is, in my case, a connector problem as i tried electronic contact spray and the connector seems pretty sturdy too.
i think it is, when i touch the screen that the flickering display begins the most and i hear a dim sound each time the screen flickers.... i am beginning to think it is a screen defect after all....:/
kind regards from France

See if you can find a full teardown of an T800 on youtube, see if there is an connector for the display and check if it loose, have you dropped or bumped your T800, do you game on it, lots of hits to the screen could have caused a fault.
It`s a shame i love my T800, Maybe sell it on ebay as faulty and get the new S4 when it released it`s supposed to have and 16:9/10 display.
John.

Tinderbox (UK) said:
See if you can find a full teardown of an T800 on youtube, see if there is an connector for the display and check if it loose, have you dropped or bumped your T800, do you game on it, lots of hits to the screen could have caused a fault.
It`s a shame i love my T800, Maybe sell it on ebay as faulty and get the new S4 when it released it`s supposed to have and 16:9/10 display.
John.
Click to expand...
Click to collapse
yes i gamed on it, but i play "gently", adventure, hack & slash RPG game...
No, i haven't dropped it and it is in a otterbox defender rugged case!
it happend just after charging it, for no reason...
Yes i love my T800 too, i bought at a very cool price a Z4 tablet, but bootloader is locked on this one(some kind of stupid lotery, imho)((
I just purchased the tab s3 at a cool price, i didn't know the tab s4 would be 16:9/10 but for gaming, 4:3 isn't a problem:/
Thank you again for your feedback!:good:
[EDIT] i followed your advice and canceled my Tab S3 purchase: i wil wait patiently for the Tab S4, thank you for that too.

Related

Screen Flickering Problem at bottom right corner only in Nexus 7 2nd Gen

I have searched the entire forum for the similar problem i am facing but couldn't find any and had to write to you in private.
I have bought my device 3-4 months ago from Bangladesh and cant claim any warranty or replacement. My device screen is flickering more often day by day at the bottom right corner. Its like a screen shot of the top or any other portion of the tab that is flickering at the bottom right corner. I tried the brightness issue, didn't work. Then I factory reset my device thought might be a bug but still no luck. Now i am worried whether this is a hardware problem or not. But i never dropped the device. So shouldn't be one.
I recorded the problem with my mobile to be more precise. Video attached herewith in zip file.
I would be really grateful if anyone can help me out with a solution.
Thanks.
Mosharraf29 said:
I have searched the entire forum for the similar problem i am facing but couldn't find any and had to write to you in private.
I have bought my device 3-4 months ago from Bangladesh and cant claim any warranty or replacement. My device screen is flickering more often day by day at the bottom right corner. Its like a screen shot of the top or any other portion of the tab that is flickering at the bottom right corner. I tried the brightness issue, didn't work. Then I factory reset my device thought might be a bug but still no luck. Now i am worried whether this is a hardware problem or not. But i never dropped the device. So shouldn't be one.
I recorded the problem with my mobile to be more precise. Video attached herewith in zip file.
I would be really grateful if anyone can help me out with a solution.
Thanks.
Click to expand...
Click to collapse
It seems like your CPU/GPU is burning out... I had the same problem when over clocking my old Galaxy Ace..
The problem may not be the same, but its all I can think of.
EDIT: it could possibly be because the ribbon cable that connects the Screen to the MoBo is loose?
Sent from my Nexus 7 using XDA Premium 4 mobile app
Abel669 said:
It seems like your CPU/GPU is burning out... I had the same problem when over clocking my old Galaxy Ace..
The problem may not be the same, but its all I can think of.
EDIT: it could possibly be because the ribbon cable that connects the Screen to the MoBo is loose?
Sent from my Nexus 7 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Ribbon cable...i thought of that too...hope that is the prob..it shouldn't be a great problem then. What if CPU/GPU is burning out...what will be the solution then? Thanks for your reply though.:good:
Mosharraf29 said:
Ribbon cable...i thought of that too...hope that is the prob..it shouldn't be a great problem then. What if CPU/GPU is burning out...what will be the solution then? Thanks for your reply though.:good:
Click to expand...
Click to collapse
If the ribbon cable is loose, power off you device and pull the back cover off and have a look.
If the CPU/GPU is burning out, the only thing I would suggest would be a moderate under clock of both units and pray that your device will last, alternatively, throw your device at a wall to preemptively break it before they do die and your device becomes a really crappy decorative ornament.
Seeing as you cannot get a replacement, your only option is to try and keep it from happening by any means.. It is only a matter of time.
OR,
I'm wrong.
Abel669 said:
If the ribbon cable is loose, power off you device and pull the back cover off and have a look.
If the CPU/GPU is burning out, the only thing I would suggest would be a moderate under clock of both units and pray that your device will last, alternatively, throw your device at a wall to preemptively break it before they do die and your device becomes a really crappy decorative ornament.
Seeing as you cannot get a replacement, your only option is to try and keep it from happening by any means.. It is only a matter of time.
OR,
I'm wrong.
Click to expand...
Click to collapse
Last night i showed my device to a professional and as this device is not much available in Bangladesh, they are not expert enough. Though he suspected it might be the cable issue but he cant be sure. He might get it right if he gets another same device to test. So m left with very few options :crying:. I got to wait for the parts to be available or i got to contact the Asus product importers but fingers crossed. Disappointing...its just a couple of months and lot of money for me.
Anyway...thanks for all the help and support. Appreciate it.
Mosharraf29 said:
Last night i showed my device to a professional and as this device is not much available in Bangladesh, they are not expert enough. Though he suspected it might be the cable issue but he cant be sure. He might get it right if he gets another same device to test. So m left with very few options :crying:. I got to wait for the parts to be available or i got to contact the Asus product importers but fingers crossed. Disappointing...its just a couple of months and lot of money for me.
Anyway...thanks for all the help and support. Appreciate it.
Click to expand...
Click to collapse
am experiencing the same issue, plz notify me if any updates, thx
I face the same issue on my nexus 7(2013). Is there any solution to this?
Sent from my Xperia Sola using Tapatalk
I have this issue as well. Got a 16GB 2013 model free that had a shattered digitizer. Replaced the screen and for about 24 hours it seemed fine (only a little use). As I began to check it out and use it I started getting this odd flicking glitch on the bottom right of the screen, right edge to about 3/4 or 4/5 to the left. over time the amount of time the glitching occurs has gotten longer, and after re-seating all of the cables (they're in good and straight) it's pretty much constant now.
same here. i haven't even overclocked my tablet i might have to open my device up some time...

screen flicker, screen freezes, and random restarts

I have an Tab S 8.4 LTE. Since upgrading to stock android 5.0.1 (from Sammobile), I have been getting screen flickering, screen freezes, and also random shutdown/restarts. None of that happened on 4.4.2, which the device came with. I've tried the following to correct the problems, with no luck: reinstall 5.0.1, cache wipe from recovery, factory data reset. Is my problem common? Is there a solution? Should I go back to 4.4.2?
A lot of problems you have mentioned is supposedly caused by an faulty/loose battery connector on the 8.4" , a lot of people say it started after upgrading to lollipop which is still not confirmed.
You can try the fix in the link below, but if it is a faulty battery connector a repair is your only real remedy to you problem.
This problem is quite common, have search you might find a more help.
http://www.problogbooster.com/2014/06/on-screen-display-flickering-error-android-xda.html
John.
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Tinderbox (UK) said:
A lot of problems you have mentioned is supposedly caused by an faulty/loose battery connector on the 8.4" , a lot of people say it started after upgrading to lollipop which is still not confirmed.
You can try the fix in the link below, but if it is a faulty battery connector a repair is your only real remedy to you problem.
This problem is quite common, have search you might find a more help.
John.
Click to expand...
Click to collapse
I had this problem. Service center in Poland (CCS) replaced screen and repaired motherboard.
Video on youtube that shows the problem :
https://www.youtube.com/watch?v=4iBDVirN_XM
corvus.corax said:
I have an Tab S 8.4 LTE. Since upgrading to stock android 5.0.1 (from Sammobile), I have been getting screen flickering, screen freezes, and also random shutdown/restarts. None of that happened on 4.4.2, which the device came with. I've tried the following to correct the problems, with no luck: reinstall 5.0.1, cache wipe from recovery, factory data reset. Is my problem common? Is there a solution? Should I go back to 4.4.2?
Click to expand...
Click to collapse
This is a common problem of Samsung tablet, battery connector is prone to crack: flickering screen, random shutdown/restart, quick discharge, battery capacity fluctuation.
If you look at Galaxy Note Pro 12.2 threats, flickering problem is the same as this model. However, the fix is simple: re solder the battery connector. Go to a repair shop or anyone knows how to re work for assistance , the work takes only under 5 minutes. No need to remove the main board, just disconnect battery cable and do the re work of battery connector's solder joints.
This battery connector is not exactly but similar to yours:
In fact, it did start after the upgrade to Lollipop, so I want to say that, for me, that is confirmed. It never happened prior to that. Nevertheless, it could be a pre-Lollipop problem. Since the unit is still in warranty, I will try to explain the problem to Samsung here. They are usually pretty good about it when I get the chance to talk with a repair tech.
Try this fix in the thread below, it worked foe an Tab S owner the other day with screen flickering.
http://www.problogbooster.com/2014/06/on-screen-display-flickering-error-android-xda.html
John.
corvus.corax said:
In fact, it did start after the upgrade to Lollipop, so I want to say that, for me, that is confirmed. It never happened prior to that. Nevertheless, it could be a pre-Lollipop problem. Since the unit is still in warranty, I will try to explain the problem to Samsung here. They are usually pretty good about it when I get the chance to talk with a repair tech.
Click to expand...
Click to collapse
Tinderbox (UK) said:
Try this fix in the thread below, it worked foe an Tab S owner the other day with screen flickering.
http://www.problogbooster.com/2014/06/on-screen-display-flickering-error-android-xda.html
John.
Click to expand...
Click to collapse
Thanks. I'll give that a try. It is worth noting that since I put 5.0.1 on my S4, it's been running smoothly.
Sefto said:
I had this problem. Service center in Poland (CCS) replaced screen and repaired motherboard.
Video on youtube that shows the problem :
https://www.youtube.com/watch?v=4iBDVirN_XM
Click to expand...
Click to collapse
Be aware that some depot techs are lack of technical skills to troubleshoot correctly, this one is a typical one.
When replacing new screen and motherboard, this guy virtually gave you a new tablet.
Beut said:
Be aware that some depot techs are lack of technical skills to troubleshoot correctly, this one is a typical one.
When replacing new screen and motherboard, this guy virtually gave you a new tablet.
Click to expand...
Click to collapse
Repaired motherboard But I don't know what exactly they did
Well, I followed the instructions to force GPU screen renderiing and for about a day, it seemed to fix the flicker/restart problem. Then, boom, it came back. So it must be a hardware issue. Off to Samsung I go.
I wonder how hot the cpu gets when the screen starts to flicker, you can download free cpu temp apps from Google Store
John.
I took the tab s to Samsung and they found it was a battery problem. They replaced the battery and all seems well after a week. Now my question is, if I use my S4 charger, which has a little lower output than the tab's charger, will that cause any problem to the battery, beyond slower charging?
Slower charging as you said will most likely problem, use the free app below to check you charging rate, look at the average ma, and press refresh a few time, on the pro version you do not have to press refresh.
https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free&hl=en
John.
corvus.corax said:
I took the tab s to Samsung and they found it was a battery problem. They replaced the battery and all seems well after a week. Now my question is, if I use my S4 charger, which has a little lower output than the tab's charger, will that cause any problem to the battery, beyond slower charging?
Click to expand...
Click to collapse
That's PERFECTLY WORKS...
vinayak.etx said:
That's PERFECTLY WORKS...
Click to expand...
Click to collapse
I wonder what did you do to fix the problem ?
Soldering worked.
I had the screen flickering problem and also random reboots on Galaxy Tab Pro 12.2 (SM-T900) and figured out that it is probably to do with the battery connector based on this post and an other post. When I opened the back cover and touched the battery connector, it just came out from its position. Samsung did a very poor job in designing this very important component which is the lifeline of the device.
However, following your advice, I first hesitated to solder it myself. I called up a repair guy and explained him that I need soldering the battery connector and he prompted $65 as the cost for it. So I decided to give a shot myself. I tried my hand at it and was able to get it done.
IMPORTANT: The connector ends are very very small and so you would need a soldering iron having a pointed tip. All you would need is to clean the battery connector ends with a hair brush and apply a very thin coating of soldering flux and have the solder lead on the pointed tip. The points on the circuit board are very close to couple of IC's and so be very careful not to touch them at all. Also, the plastic used in the battery connector component is not a good quality plastic and so be very careful in handling it.
Once the battery connector is soldered, I haven't seen any flickering so far and random reboots are gone. So far so good. I shall update this post if I see any deviation or any other update relevant with this issue.
Thank you @Beut for your post and providing insight about the problem.
Beut said:
This is a common problem of Samsung tablet, battery connector is prone to crack: flickering screen, random shutdown/restart, quick discharge, battery capacity fluctuation.
If you look at Galaxy Note Pro 12.2 threats, flickering problem is the same as this model. However, the fix is simple: re solder the battery connector. Go to a repair shop or anyone knows how to re work for assistance , the work takes only under 5 minutes. No need to remove the main board, just disconnect battery cable and do the re work of battery connector's solder joints.
This battery connector is not exactly but similar to yours:
Click to expand...
Click to collapse
Don't forget that a loose white battery connector also a factor of flickering, usually when disconnected it many times, this white connector may not make good contact with pins of black battery connector. I had one that black battery connector already resoldered but it still flickered at 70% batttery. I did a simple fix by pushing the opening tip closer. Many good batteries were wasted because most users don't know this simple trick, just disconnect and connect battery may fix auto reboot problem and don't know why.
This is what it looks like when a cable removed from the connector:
This is a bad contact, pin sits in the middle of opening of cable clip.
This is the adjustment to make the opening closer:
How to do it with a thin knife:
https://www.youtube.com/watch?v=PU0OoZSbma8&feature=youtu.be
Then, this is a good contact
After the fix of male and female battery connectors ( black and white ), I guarantee that flickering, freeze, auto restart, auto shutdown problems will not return, unless you have a bad battery.
Beut said:
This is a common problem of Samsung tablet, battery connector is prone to crack: flickering screen, random shutdown/restart, quick discharge, battery capacity fluctuation.
If you look at Galaxy Note Pro 12.2 threats, flickering problem is the same as this model. However, the fix is simple: re solder the battery connector. Go to a repair shop or anyone knows how to re work for assistance , the work takes only under 5 minutes. No need to remove the main board, just disconnect battery cable and do the re work of battery connector's solder joints.
This battery connector is not exactly but similar to yours:
Click to expand...
Click to collapse
Hi @Beut,
I followed your post and fixed my tab by soldering the battery connector as you mentioned.
Do you happen to know what's the type of battery connector is it? I mean, if I want to buy that connector online, what should I be looking for?
Thanks.
Uresh
replied using Tapatalk
uresh.kuruhuri said:
Hi @Beut,
I followed your post and fixed my tab by soldering the battery connector as you mentioned.
Do you happen to know what's the type of battery connector is it? I mean, if I want to buy that connector online, what should I be looking for?
Click to expand...
Click to collapse
I don't think you can find it online. Re solder is sufficient, no need to replace a new one.
But why you need a new connector ? Broken or damaged ? If you need one I may help you where to find it, but change this connector is not simple as re solder unless you know how and have right equipment like hot air gun, hot plate ...etc....
in a worst case scenario.
Beut said:
I don't think you can find it online. Re solder is sufficient, no need to replace a new one.
But why you need a new connector ? Broken or damaged ? If you need one I may help you where to find it, but change this connector is not simple as re solder unless you know how and have right equipment like hot air gun, hot plate ...etc....
Click to expand...
Click to collapse
As of now, things are fine. The tablet is working fine even on longer duration of usage like playing videos on YouTube app continuously or video calls. The battery charge is lasting long besides there is no overheating like it happened before when the connector was loose. Thanks again.
However, when the connector got detached earlier, I observed that the plastic used to design that component is of pretty cheap quality and I doubted if it would stand even before I soldered. Anyways, I managed to solder that without breaking/damaging it. My fear is that the plastic base on which the (metal) connector components were placed in side-by-side fashion would disintegrate if when the plastic base gets damaged and that is my worry. I hope you understood my point.
Also, I would appreciate if you point me to any links that would explain a little more about these components.

busted lcd?

Bought my sister a tab s as a gift.
Brother flew home with it, in carry on.
Was working fine, then "randomly" overnight decided to do this.
Looks to me like the LCD just killed itself, but has anyone experienced any like this.
its the infamous battery issue I think...
mine was like that several times before I decided to change the battery under warranty, and working perfectly since....
Crescendo Xenomorph said:
its the infamous battery issue I think...
mine was like that several times before I decided to change the battery under warranty, and working perfectly since....
Click to expand...
Click to collapse
Interesting. Do you have any specific information regarding this issue that might justify a replacement from Samsung? Is there a self-fix?
Check on youtube for a guide on how to take the T700 apart it`s quite easy, check the battery connector, check the display cable.
The 8.4" has a lot of problems with connectors becoming loose, I think it`s because it can be bent without breaking inside pants pockets ect gradually loosening the connectors, You cannot do that with the 10.5"
John.
Thanks John. Will send this along to my bro.

[Q] Screen flickering because of (top old and weak) battery?

Good evening,
Since a short time I have problems with my Tab S (10.5 LTE)
The display is now flickering so hard that the tablet can hardly be operated.
Initially, it was only after starting, but now it's getting worse.
Today I unplugged the connector to the battery and connected it again, just like the display flat cable, without change ...
Here I attached a video that shows the problem: https://www.android-hilfe.de/attachments/20180725_231014-mp4.648541
What could it be? The battery that makes the bend after 4 years or something else like the display cable or even the display itself? The battery for 20-30 € I wanted to change anyway, even if the current still holds pretty well. Could not explain to me why the flickering should come from a battery.
What do you think? Who had the same problem and could solve it?
Thanks and regards
Hi, I've faced similar problems.
We talked about it here :
https://forum.xda-developers.com/showpost.php?p=76242206&postcount=749
https://forum.xda-developers.com/showpost.php?p=76247114&postcount=754
Sadly, you may not fix it.
Hope this helps.
I was having this problem as well. I just reseated the battery in the device (power connector) and it seems to have gotten better.
j1gga84 said:
Good evening,
Since a short time I have problems with my Tab S (10.5 LTE)
The display is now flickering so hard that the tablet can hardly be operated.
Initially, it was only after starting, but now it's getting worse.
Today I unplugged the connector to the battery and connected it again, just like the display flat cable, without change ...
Here I attached a video that shows the problem: https://www.android-hilfe.de/attachments/20180725_231014-mp4.648541
What could it be? The battery that makes the bend after 4 years or something else like the display cable or even the display itself? The battery for 20-30 € I wanted to change anyway, even if the current still holds pretty well. Could not explain to me why the flickering should come from a battery.
What do you think? Who had the same problem and could solve it?
Thanks and regards
Click to expand...
Click to collapse
Actually I'm having the same problem but on my Tab S2. It happens once the battery depletes below 30%. I believe the problem is down to the battery depleting so much that it can't power the display and/or higher clock speeds. The solution is definitely to replace the battery.
Thanks for the information.
I did that, replaced the battery and also the flex cable for the display but no success, the problem still persists
It seems that my mainboard is broken somehow or the touchscreen and the Tab S is not repairable anymore..
I will maybe buy an used one again or wait for the Tab S4
Regards
Sent from my SM-G960F with Tapatalk
M9x3mos said:
I was having this problem as well. I just reseated the battery in the device (power connector) and it seems to have gotten better.
Click to expand...
Click to collapse
Same.
Sadly my SM-T800 screen started having this flicker problem. Nothing helps. The battery connector "looks good", but then I don't have the eyesight to see what's really going on. The logic board on the T800 has a very unfortunate packaging where the battery connector is next to a heatsink. I certainly couldn't resolder it myself even if I tried. I guess this is the end of road for my Tab S.
https://i.ebayimg.com/images/g/Yv0AAOSw6eRcWaTL/s-l1600.jpg

Samsung Galaxy Tab S4 Screen Issue After Android 10 Update

After I updated my Galaxy Tab S4 to Android 10 with One UI 2, the screen became like the picture attached. Now half of the screen is occupied by black and white stripes.
I contacted Samsung and tried all the possible troubleshooting solutions but in vain, the problem still existed.
I also started a thread on Samsung community about this issue, and I got a lot of replies about the same screen problem that happened with many people.
https://eu.community.samsung.com/t5...en-issue-after-android-10-update/td-p/1837825
Still no response from Samsung about that.
Please can you help me with this issue?
I got 100% same problem
I try downgrade and same
But mine its from damage during shipping, the glass covering the amoled is cracked but I hope the screen its not affected.
Now I'm waiting the HDMI to usb type c cable to arrive to see if its screen or motherboard problem
If I lock/unlock(power button) fast and many times the lines dissapear and works normall a while
Do you fix it or you find what is wrong?
Today the HDMI to usb type c cabe arrived from china
I connect the tablet to TV and seems that lines are only on amoled, unfortunately the screen seem to be faulty
Hi at all the community, and Merry Christmas, oh oh oh
I made this post because i want to clear the situation about this very diffused issue that occur on samsung tab s4. I'm going to buy a tablet in the same screen condition in the attached picture, but before i want to know if the problem is related to the screen only or it's an hardware issue that affect the motherboard.
Please if anyone has fix this, please share a solution because in internet there are tons of user that ask for that and i haven't found if it's a screen or motherboard problem.
Thanks and wish you a merry christmas to all the community
majdantonio said:
After I updated my Galaxy Tab S4 to Android 10 with One UI 2, the screen became like the picture attached. Now half of the screen is occupied by black and white stripes.
I contacted Samsung and tried all the possible troubleshooting solutions but in vain, the problem still existed.
I also started a thread on Samsung community about this issue, and I got a lot of replies about the same screen problem that happened with many people.
https://eu.community.samsung.com/t5...en-issue-after-android-10-update/td-p/1837825
Still no response from Samsung about that.
Please can you help me with this issue?
Click to expand...
Click to collapse
unfortunately this is not screen issue, this is RAM or CPU issue, i did a Reballing and RAM replacement on Customer's TAB S4 and the issue was solved.
MULTITECH on Instagram: "Galaxy Tab S4 with image issue, done. CPU reball and RAM replacement. #microsoldering #microsoldagembrasil #microsoldadura #microsoldagem"
24 likes, 2 comments - MULTITECH (@multitechrepair) on Instagram: "Galaxy Tab S4 with image issue, done. CPU reball and RAM replacement. #microsoldering #microsold..."
www.instagram.com
Thanks biohazard for your reply, i'm going to examinate the motherboard I really trust in yor words and is what i believe..
Anyway someone else can confirm after changing the screen this kinda of issue persist?
I want to clear the situation share your experience!
I can confirm what biohazard16 said, it's not oled screen problem or display coonection problem but hardware problem on the motherboard. I've tried to connect my tablet using MHL cable to a TV and the picture on the TV is perfect without any glitch, clear of any half screen issue. I've tried to install another original screen 100% working and i've still had the same half screen issue, it's not a screen problem.
I search a lot in internet for complete schematics or boardview for this Tab S4 but i've only found a service manual that doesn't help. If anyone have boardview or any other Oled pinout please post.
I think that Samsung after made a good tablet, wich a large amount of these have the same screen issue, must be release the complete schematics because people with good skills can repair a Project/Assembly mistake made by Samsung, but till now from Samsung 0 news.
At this point i want go through the problem and i've attached a picture of what IC need to be reball/resolder.
biohazrd16 or anyone can confirm i'am right?
I start thinking that reapir this kind of issue is like the 3rd secret of Fatima ;-)

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