Screen Dimming in Sunlight - Samsung Galaxy Note 20 Ultra Questions & Answers

Friends there is some logic related to screen brightness and phone temperature. If the phone temperature is above 40°C, the creen in direct sunlight becomes dim even in full brightness and difficult to read. My iphone 11 screen remains bright in same conditions. The issue also existed for my earlied Note10+ handset. Does anybody face same issue in high temperature countries like India?

Not a good idea to view in direct sunlight for very long.
The phone dissipates heat through the screen... it can't when the screen is baking in the sun!
104 F is well within tolerance levels but is more stressful for the battery.
What you might not be seeing are other temp read outs from other temp sensors (there's about a dozen or more) on the phone which might be being pushed to their critical levels.
>When you see a phone doing this best practice is to turn off the screen and leave cool down. Phones that aren't optimized correctly can heat up rapidly even with no foreground apks running.
>If turning off the screen doesn't seem to be helping, power down the phone and allow to cool before using!
Wrapping a damp rag around backside of the phone can also be used to bring down the temp especially in dry climates

Same here but not really hot phone
Yes i got the same problem. But my phone is not very warm at all and it dimms by sunlight.. i think phone outside is max 40°c. I wonder why they do this, they put a display with 1600nits in and then it cant bring all because its too "warm" got this on none of other phones. Only samsung problems. And this **** cost 1200. I really dont understand what theyre doing
Greets
Marc
nitinmits said:
Friends there is some logic related to screen brightness and phone temperature. If the phone temperature is above 40°C, the creen in direct sunlight becomes dim even in full brightness and difficult to read. My iphone 11 screen remains bright in same conditions. The issue also existed for my earlied Note10+ handset. Does anybody face same issue in high temperature countries like India?
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Click to collapse
---------- Post added at 10:22 PM ---------- Previous post was at 10:19 PM ----------
I tested this. My n20u warms so rapidly up even if i doing nothing or shut it down. And i was only for 3-5mins outside at sun. Outside temp was like 25-27°c.
My phone was not very hot not even really warm, but display dimmed very hard so i cant see anything outside.
blackhawk said:
Not a good idea to view in direct sunlight for very long.
The phone dissipates heat through the screen... it can't when the screen is baking in the sun!
104 F is well within tolerance levels but is more stressful for the battery.
What you might not be seeing are other temp read outs from other temp sensors (there's about a dozen or more) on the phone which might be being pushed to their critical levels.
>When you see a phone doing this best practice is to turn off the screen and leave cool down. Phones that aren't optimized correctly can heat up rapidly even with no foreground apks running.
>If turning off the screen doesn't seem to be helping, power down the phone and allow to cool before using!
Wrapping a damp rag around backside of the phone can also be used to bring down the temp especially in dry climates
Click to expand...
Click to collapse

Related

[Q] Any concerns about the heat the GT2 (7") produces?

I've removed the back protective film and notice that just through normal browsing usage that the device tends to get a good bit warm. I also own a SGS2 which only gets warm during excessive gaming sessions.
Is there anything to worry about here or do I just need to get used to it? Due to the size of the device, it's easy to notice the temp change and it's always a concern. Is there an acceptable temp range and if so, how do you guys measure it?
Kadin said:
I've removed the back protective film and notice that just through normal browsing usage that the device tends to get a good bit warm. I also own a SGS2 which only gets warm during excessive gaming sessions.
Is there anything to worry about here or do I just need to get used to it? Due to the size of the device, it's easy to notice the temp change and it's always a concern. Is there an acceptable temp range and if so, how do you guys measure it?
Click to expand...
Click to collapse
Mine does the same thing. While browsing the Web the left side gets noticeably warmer. With that said the device never gets too warm. I checked it with a heat gun and the two sides(in portrait) Vary by about 5 degrees Fahrenheit(89 and 94) so it's definitely nothing to worry about.

[Q] Serious Nexus 5 overheating problem

Hello. I'm new with the account here, but been reading this forum for years.
I'm creating this thread because my new Nexus 5 (which I have for 20 days now) is overheating more than a normal mobile device should.
When i bought it, it had 4.4.4 Kit kat android, and I had that one for about 5 days, and in that time, I didn't notice any overheating, or maybe didn't pay attention, can't remember really.
But after installing official Lollipop 5.0.1, the device is heating pretty good even when browsing internet for 5 minutes, at about 30-40% brightness.
**** Please tell me if some of your devices are acting the same, and is it worth a try to install back an older android to try if it will stop overheating, or my device may be faulty and should I take it back for another one (or maybe switch to LG G2) ?
Because I'm still unable to post image links, i will write it down:
- Ambient temperature: 23 degrees Celsius
- The temperature sensor is taped on the back side, at the side of camera, this is where it overheats most. (even if not using camera)
- Phone temp after staying on standby with screen off: 28 C (it's not warm but it is warmer than desk which it is sitting on)
- After staying idle on home screen with screen on for 10 minutes (50% brightness): 30.5 C
- After chatting on Messenger for 10 minutes: 34.3 C (feels warm)
- After recording video for 4 minutes: 41 Celsius!!! (almost uncomfortably hot in the whole upper half of the phone, both the back side and the screen)
- After 15 minutes letting it cool down, with screen off of course, it is 38 C (still hot to touch), and it stays like that untill I reboot the phone, then it cools down.
The test took about 50 minutes, and after that, battery was drained for about 25%.
-While charging, the phone does not overheat, just gets a little warm which is OK. (haven't tried wireless charging)
P.S. I don't play games on the phone...
Please act quick in case I should return the phone...
the only time my phone gets hot is when im intensively doing a lot of things..
for example.. im playing ingress, have tether ON, and my two sons are using their tablets connected to my phone playing ingress too..
but if i turn off the game and turn off tether, it cools down..
to me it sounds u have something intesively using your CPU and perhaps GPS and other radios.
hold power button.. when PWR OFF shows, long press it and reboot into SAFE MODE...
use the phone for a bit and see if it gets warm... this should tell you if its apps installed.
I only used wifi, no tethering, no GPS, 3G, NFC or any other radios, cell signal is good so phone is not searching for it.
- In safe mode, it still gets warm when using camera. When browsing internet and watching images in google search, also but just mild warm..
- But after sitting and thinking, I've found a problem! After recording with camera and leaving it to cool down, it didn't cool down because it had to make an effort to upload that 5 min video on Google drive via Auto backup!
After turning the Auto-backup off, it is now much cooler!
I will post tomorrow with the results, if something changes...
Anyway, thank you!
First of all, "warm" doesn't mean anything.
Battery temperature does not mean much either, as the CPU is what generates the most heat.
There is a battery temperature throttle that reduces the CPU frequency, but it is almost entirely pointless as the CPU will always reach it's own throttle temperatures MUCH, MUCH earlier than the battery will. The CPU starts throttling at 65C CPU temp (NOT battery temp), and shuts itself down at about 105C CPU temp. Unless your battery somehow reaches a batterytemp of 70C+ (nearly impossible because the CPU will always hit it's throttle first), then I would never even take it into any sort of consideration unless you have a physical battery defect.
Using the camera generates heat since it's CPU and power intensive.
Using the phone in general will generate heat.
Keep in mind that mobile devices are passively cooled, not actively cooled with a fan/liquid.
Not sure what you're so worried about.
Lower your brightness
Lethargy, thank you for a short physics lesson. I'm already into physics and cooling systems so all is clear. I was just worried a bit because all of my previous phones weren't getting this warm (hot), but also never had a multi-core processor in phone eather, maybe that's the reason why I never experienced this before.
Battery temp (measured with app) gets up to 40-42 degrees Celsius, while the phone case gets up to 41 when recording video. Of course that temp won't damage the device, I'm not worried about the processor, but that temp is degrading battery life, in long term.
And about the brightness, phone is not meant to be used at lowest brightness all the time, so that shouldn't be an excuse for high temps. Just sayin'...
Sent from my Nexus 5 using XDA Free mobile app
AlexSRB said:
Lethargy, thank you for a short physics lesson. I'm already into physics and cooling systems so all is clear. I was just worried a bit because all of my previous phones weren't getting this warm (hot), but also never had a multi-core processor in phone eather, maybe that's the reason why I never experienced this before.
Battery temp (measured with app) gets up to 40-42 degrees Celsius, while the phone case gets up to 41 when recording video. Of course that temp won't damage the device, I'm not worried about the processor, but that temp is degrading battery life, in long term.
And about the brightness, phone is not meant to be used at lowest brightness all the time, so that shouldn't be an excuse for high temps. Just sayin'...
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
The only thing that sounded odd was how it wasn't cooling down until you rebooted, but it sounds like you figured that out with the automatic upload setting.
41-42c battery temp can be normal after prolonged usage, though personally I usually see that after a short gaming session. My brightness is around 40% and high brightness will cause extra heat.
Otherwise the phone is very thin so you can feel the stacked SoC and RAM heat up through the skin fairly easily, right around the camera area as you mentioned.
I think each device and CPU is slightly different and can vary by a few degrees under load as well.
AlexSRB said:
Lethargy, thank you for a short physics lesson. I'm already into physics and cooling systems so all is clear. I was just worried a bit because all of my previous phones weren't getting this warm (hot), but also never had a multi-core processor in phone eather, maybe that's the reason why I never experienced this before.
Battery temp (measured with app) gets up to 40-42 degrees Celsius, while the phone case gets up to 41 when recording video. Of course that temp won't damage the device, I'm not worried about the processor, but that temp is degrading battery life, in long term.
And about the brightness, phone is not meant to be used at lowest brightness all the time, so that shouldn't be an excuse for high temps. Just sayin'...
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
Your temperatures are fine and you shouldn't worry about it. It's average for a Nexus 5, and there are throttles/shutdown temps anyways, for both the battery and CPU. I've had mine for a year and there hasn't been any sort of issue, normal usage should be negligible to the condition of the battery.
Ok, everything seems to be ok then. Now I can go to sleep without worrying Thanks guys!
Sent from my Nexus 5 using XDA Free mobile app

Does the device get hot?

Does it get hot under normal usage? How much degree celcius are you getting while doing basic task and watching video?
No no heat problems on mine. I believe Sony has introduced new technology for the heat problem.
ali_bobo said:
No no heat problems on mine. I believe Sony has introduced new technology for the heat problem.
Click to expand...
Click to collapse
Can you tell me what degree celcius of the CPU and battery when doing basic tasks
linkzex said:
Can you tell me what degree celcius of the CPU and battery when doing basic tasks
Click to expand...
Click to collapse
Both sitting on average 28 Degrees.
ali_bobo said:
Both sitting on average 28 Degrees.
Click to expand...
Click to collapse
Does it get warm while watching 4k content? Like in this video https://youtu.be/cjApm_Stl5Y
linkzex said:
Does it get warm while watching 4k content? Like in this video https://youtu.be/cjApm_Stl5Y
Click to expand...
Click to collapse
Nope no signs of phone getting warmer. Played perfectly fine.
My XZ or XZs didn't get hot or even slightly warm, exactly the same deal with this, I would say it runs even cooler!
That link only offers me a max of 1080/60 not 4k
cliffr39 said:
That link only offers me a max of 1080/60 not 4k
Click to expand...
Click to collapse
Because video in link is recorded to 1080/60fps...
The phone is runs cool and somehow has what's turning out to be quite a long battery life
Sent from my G8141 using Tapatalk
Well, I have been testing my XZP for two now. It is getting warm - definitely. If you put it under extreme load, it´s getting warm, even that warm your palms get a little sweaty - but not uncompfy warm. My LG G4 in comparison got that hot you´d barely wanna touch it.
Look for an app on Google play called "epic citadel" and run it.
Left it going for about 30 minutes and walked around a bit. Phone got Luke warm. Used 8% of the battery.
Not so much hot to me
Sent from my G8142 using Tapatalk
Any and all computer(s) CPU's will get warm to hot depending on the load. This is the nature of the beast. But mine does not get warm at all the way I use it. My battery life is phenomenal!
Gets warm if you play games for a long period, but nowhere near hot. Also I noticed that, compared to my old phone, the warmth is pretty much the same on the entire back. It's not just hot where the chipset is. All in all, the phone is awesome regarding heath control.
The phone does get hot after a while.
It's cool most of the time, and even if it gets hot, it has great cooling so leaving it alone cools it off in minutes.
As for the temperature, i was doing a stress test the other day (3D) and the phone seems to have capped at 38-39 Celsius degrees (that is slightly higher than body temperature so you can definitely feel it). I didn't check temperature after that though.
It also gets warmer while both watching and shooting at 4K, or high speed (even 1080p though).
However trust me, if you had the Z3 Compact like I did, that phone was a freaking furnace. My battery was affected by it. If want to use my Z3C as a gps in my car, i have to shove it in front of the AC to keep it cool otherwise I'm afraid it's going to evolve into a Samsung Galaxy Note 7.
So this phone is a big big improvement. Though I'd like a phone someday that definitely doesn't get hot. But maybe that's too much to ask.
As I'm typing this, after about 30 minutes of active use, my battery is 35 celsius degrees. From normal use.
A cell phone is just too small to dissipate heat in a very efficient manner. That is why super fast, and powerful, gaming desktop PC's have several fans installed in them along with huge heat sinks sitting right on top of the CPU. The heat sinks are larger than this entire phone! I am an IT Systems Engineer and if you've ever had the opportunity to go to a large data center where servers are housed you will quickly notice the high volume of moving air in the entire area. It can even get quite cold in some data centers all for the same reason... Computers can get very hot! So the fact that OEM's can keep these things as cool as they do, with the CPU housed in such a small, airtight space, is really a marvel of engineering.
Hello , the phone doesn't get hot like my z2 is used to be , I've managed twice to get the phone (on purpose) , but with normal usage 4K video / gaming etc it won't get hot unless you spam many task at hight speed

HTC u11 heating

I just bought the HTC U11 and it's amazing. The only issue is that since I turned it on it feels quite warm in the hands. (I'm not used to that unless it is on heavy usage)
Is this normal? What are the normal temperature ranges? What are the temperature ranges that you are getting when you use it?
My phone seems to be at 36-40 degrees when connected to the internet, not downloading any apps and on light use.
What's the highest temperature at which I should start worrying?
For 20 days I have it, I have yet to experience it warm in hands (no matter what I do). This is current situation:
Maybe it's doing some updates in the background? Like for me, the Google photos in the beginning (of setting up the phone) would be downloading the thumbnails from my account. My phone run pretty cool to touch, even when running Candy Crush... on my Moto X pure it was hot when doing that.
35-40 degrees is standard for me under normal use, with HTC's bundled case and 28ºC room temperature..
The phone only gets a bit warm (not burning hot at all) but I'm worried about the long term effect on battery life.
Aish466 said:
I just bought the HTC U11 and it's amazing. The only issue is that since I turned it on it feels quite warm in the hands. (I'm not used to that unless it is on heavy usage)
Is this normal? What are the normal temperature ranges? What are the temperature ranges that you are getting when you use it?
My phone seems to be at 36-40 degrees when connected to the internet, not downloading any apps and on light use.
What's the highest temperature at which I should start worrying?
Click to expand...
Click to collapse
Do you feel the area above fingerprint sensor hotter than compared to the other area?
aadeshiscool said:
Do you feel the area above fingerprint sensor hotter than compared to the other area?
Click to expand...
Click to collapse
The phone is hotter on the top and bottom parts of the screen (right above the finger print sensor compared to the middle of the screen.
x_d_n said:
35-40 degrees is standard for me under normal use, with HTC's bundled case and 28ºC room temperature..
The phone only gets a bit warm (not burning hot at all) but I'm worried about the long term effect on battery life.
Click to expand...
Click to collapse
Thanks! This sounds similar to what I'm experiencing. What's weird is that whenever I use the phone I also get a tingly numb sensation in my hands and arm (which has never happened with any other phone)which is also making me more sensitive to it.
namartlu said:
Maybe it's doing some updates in the background? Like for me, the Google photos in the beginning (of setting up the phone) would be downloading the thumbnails from my account. My phone run pretty cool to touch, even when running Candy Crush... on my Moto X pure it was hot when doing that.
Click to expand...
Click to collapse
It's still the same case even a day later, so I don't think it's because of any background updates.
Thanks for telling me!
Aish466 said:
Thanks! This sounds similar to what I'm experiencing. What's weird is that whenever I use the phone I also get a tingly numb sensation in my hands and arm (which has never happened with any other phone)which is also making me more sensitive to it.
Click to expand...
Click to collapse
The phone is shocking you, maybe? Could be distributing an electric charge through your arm...
Aish466 said:
Thanks! This sounds similar to what I'm experiencing. What's weird is that whenever I use the phone I also get a tingly numb sensation in my hands and arm (which has never happened with any other phone)which is also making me more sensitive to it.
Click to expand...
Click to collapse
Are you used to smaller phones? Phablets like this are a bit awkward to handle unless you have huge hands, maybe that's the reason.
Mine heats up as well. I only play games like Angry Birds, Plants vs Zombies and Candy crush. I installed CPU-Z to monitor the temperature. Cpu temperature is around 45-47c whole playing games. It reaches 50c while video recording. While Browsing and reading, the temp is around 38-40c. The area above the fingerprint sensor gets warm first and then the rear (near the camera). Is this normal?
50c is nothing unusual for a htc device. If the device feels warm to touch then everything is normal. If the device feels ice cold and you record those temperatures then you have a problem. The chip will have a thermal cut out switch so if your phone gets too hot it'll switch off. I think it's somewhere around 60c-65c as 70c is the standing temp for boiled water which can cause serious burns to skin, like a cup of coffee or tea.

Question about heat issue and screen dim

hey guys !
iv got real issue with the flip 4 , i like the brightness to be full and also the extra brightness
but every min that i just do simple stuff like open face book or just playing few sec with the phone my phone begin to warm in the upper side
and the screen dim much , but i only do stuff like few second so whats the point of the brightness
im at home and its not hot in my room.
maybe its defect of the screen or its like that ? cause when i hade s 22 ultra it also dim screen when get warm and the iphone also dim the screen when become hot but in the flip 4 i just do simple stuff and the screen dim then even the brigthness slider when i play with it is not function wtf? can you help me thx
Why are you burning up your retinas? Dim light isn't harmful to your eyes but bright light can be.
There absolutely no reason to use full brightness indoors all the time.
Moreover full brightness greatly reduces battery run time, lifespan as well as display lifespan.
It's best practice to not use these devices in direct sunlight... it will rag them out.
If you're hitting the thermal limits of the device and its battery or cpu core temps are too high ie the device is operating within normal parameters as opposed to a defective thermal sensor all you can do is reduce the load.
By turning down display brightness, reducing bandwidth usage and better optimizing the device to reduce power consumption. What's it's average mAh usage? SOT?
Heat is the inevitable byproduct of power consumption; reduce power consumption to reduce the heat.
blackhawk said:
Why are you burning up your retinas? Dim light isn't harmful to your eyes but bright light can be.
There absolutely no reason to use full brightness indoors all the time.
Moreover full brightness greatly reduces battery run time, lifespan as well as display lifespan.
It's best practice to not use these devices in direct sunlight... it will rag them out.
If you're hitting the thermal limits of the device and its battery or cpu core temps are too high ie the device is operating within normal parameters as opposed to a defective thermal sensor all you can do is reduce the load.
By turning down display brightness, reducing bandwidth usage and better optimizing the device to reduce power consumption. What's it's average mAh usage? SOT?
Heat is the inevitable byproduct of power consumption; reduce power consumption to reduce the heat.
Click to expand...
Click to collapse
man loll i just say i play with facebook whatsapp for just around 2 min and the screen dim all you sayed got nothing to do with it , i see better with max brightness thats why they made it so??? its not possible that after 2 min the screen will dim the phone is new from today and i dont have nothing on it so this strange
nosferatu123 said:
man loll i just say i play with facebook whatsapp for just around 2 min and the screen dim all you sayed got nothing to do with it , i see better with max brightness thats why they made it so??? its not possible that after 2 min the screen will dim the phone is new from today and i dont have nothing on it so this strange
Click to expand...
Click to collapse
Is it just those 2 social media apps doing this?
I don't allow any social media or shopping apps on my phones. Trashware at best, spyware and/or malware at worst.
Just general use outside/car mine gets pretty warm and screen dims. Compared to my S22 Ultra it rarely dimmed but also a bigger phone
You likely know this but it bears repeating:
The processor and other circuits are mostly on the upper-half of the phone, near the camera. These chips do get warm, even hot, when applications are in use.
A lithium ion batter, when being charged or discharged, gets warm, even hot, depending the current flow needed to operate the applications, chips, and screen.
An OLED display can get warm, even hot, when lit brightly.
An OLED screen in sunlight will get warm, even hot, even if powered off, because it appears black.
Outside, if the OLED is bright white, it still gets hot because turning on all the pixels takes power, which is expressed as photos (light) and heat.
A very compact phone, like the Flip, has little surface area to expel heat. It doesn't have a fan, so the only way the phone cools is by convection (passing heat to the surrounding air) or transferring heat to your hand or (don't try this) water.
A folded Flip has about one-half the area to dispel heat because the screen cannot effectively radiate heat to the air or your hand.
Some applications use a lot of processing power even if you think you're using them. This is why so many people on this site discuss removing and/or disabling applications.
You can check in Settings --> Battery and Device Care --> tap on Battery --> tap on the graph, and the phone will display which applications are using the batter.
It's my understanding that the processor, battery and screen all have "checks" to ensure they don't get too hot, and Android can throttle these components to prevent wearing them out, burning them out, or causing a fire.
Hopefully others will better understand some of the challenges Samsung has in creating such a unique phone.
wpscully said:
You likely know this but it bears repeating:
The processor and other circuits are mostly on the upper-half of the phone, near the camera. These chips do get warm, even hot, when applications are in use.
A lithium ion batter, when being charged or discharged, gets warm, even hot, depending the current flow needed to operate the applications, chips, and screen.
An OLED display can get warm, even hot, when lit brightly.
An OLED screen in sunlight will get warm, even hot, even if powered off, because it appears black.
Outside, if the OLED is bright white, it still gets hot because turning on all the pixels takes power, which is expressed as photos (light) and heat.
A very compact phone, like the Flip, has little surface area to expel heat. It doesn't have a fan, so the only way the phone cools is by convection (passing heat to the surrounding air) or transferring heat to your hand or (don't try this) water.
A folded Flip has about one-half the area to dispel heat because the screen cannot effectively radiate heat to the air or your hand.
Some applications use a lot of processing power even if you think you're using them. This is why so many people on this site discuss removing and/or disabling applications.
You can check in Settings --> Battery and Device Care --> tap on Battery --> tap on the graph, and the phone will display which applications are using the batter.
It's my understanding that the processor, battery and screen all have "checks" to ensure they don't get too hot, and Android can throttle these components to prevent wearing them out, burning them out, or causing a fire.
Hopefully others will better understand some of the challenges Samsung has in creating such a unique phone.
Click to expand...
Click to collapse
thx for your great reply
hyelton said:
Just general use outside/car mine gets pretty warm and screen dims. Compared to my S22 Ultra it rarely dimmed but also a bigger phone
Click to expand...
Click to collapse
My flip4 is up and running and no negatives so far. Just slightly warm while I was downloading over wi-fi some 15GB of my music. The overall quality of this phone is pretty good, just like my S22, but it folds to 1/2 of S22 in size. Spent several hrs setting it up and debloating, I always do these things manually. This phone is very responsive and operates smoothly.
On the side note: picking up the delivery from Bestbuy, rather than getting it to my door by Fedex, wasn't a good idea - now I have to look somewhere for an mt box for packing up and shipping my trade-in, Bestbuy just handed to me two small retail packages w/ the phone and silicone cover. They don't handle trade ins.

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