If anybody else still owns a Tab S this 2020 and still experiencing this problem, give it a shot. This tablet was borderline unusable without a charger before, now it's perfect again for studying and web surfing. I'm gonna see if I can push the underclock to 2000 MHz but I'm already very satisfied with the results at 1900 MHz. No flicker, loss of signal, crash whatsoever. I'm at 60% and going strong when previously I was crashing at 88%. Will be testing to see if I can drain the tablet's battery to near zero without crashing. Before the underclock my tablet would've crashed hours ago ago if it weren't attached to a charger. The warmer colors on the screen help you relax and reduce eye strain so that you can sleep peacefully. I am about to do further testing but I am typing this message now on this tablet. Essentially what this tool does is, it warms up the screen just before your bedtime. I have owned this tablet for years and this is the only solution that has so far lasted more than half a day. (the app I used specifically is called Quick CPU Overclock Lite). I underclocked the CPU from a max of 2100 MHz to 1900 using a generic CPU overclock/underclock app. I have finally found a solution that seems to have worked. The battery has also been replaced years ago (1 year after I bought it) by a third-party before which only temporarily solved the problem. Pushing the pins only fixed the problem for half a day before the problem comes back again. Even tried opening up the back and pushing the pins together to no avail. I've tried almost everything except for soldering. The problem is much worse if I'm using 4G mobile data. Like everybody here, I have experienced the screen flicker, then loss of signal, then flicker again then crash/reset of the tablet when my Tab S LTE 8.4 isn't connected to a charger. Thank you for your post and providing insight about the problem. I shall update this post if I see any deviation or any other update relevant with this issue. Once the battery connector is soldered, I haven't seen any flickering so far and random reboots are gone. Also, the plastic used in the battery connector component is not a good quality plastic and so be very careful in handling it. 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. 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. IMPORTANT: The connector ends are very very small and so you would need a soldering iron having a pointed tip. I tried my hand at it and was able to get it done. 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. However, following your advice, I first hesitated to solder it myself. Samsung did a very poor job in designing this very important component which is the lifeline of the device. When I opened the back cover and touched the battery connector, it just came out from its position. 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.
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