Hey Folks,
I was using an app today called "instant heart rate", and i noticed that my LED flash get's uncomfortably warm when i touch it! I have used this app many times before with my older galaxy phones, and i never had any issues with a hot led, i could keep my finger on it as long as i wanted and it never got hot, only slightly warm. However with the optimus G, i noticed that within seconds the the LED get's scorching hot to the touch!
Has anyone else noticed this on your devices? If you turn on your camera flash, and you touch it with your finger firmly in place, does it get too hot to hold comfortably in place for more then 10 - 20 seconds?
I'm wondering if the glass design of the back is acting as a heatsink for the LED and what i'm feeling is the instant heat transfer from the LED, wheras with a plastic device like a galaxy phone, the heat is confined to the PCB and is not directly transmitted to the back cover.
Can you guy's check and report back. You can use any app, like torch, or camera. I only mentioned instant heart rate because the app requires you to touch the camera and flash for it to work.
Tried it, it is getting hot... to hot to hold it.
But then, It is a light...!
My one is ok. I mean it gets hot, but still i can touch it.
Mine gets pretty hot, but I can still touch it.
I accidentally left it running once for a few hours and nothing happened, it was still fine so looks like there's no need to worry.
Related
(I posted this first in the Desire Z forum. I didn't realize there was a separate G2 forum. I even looked for it.)
I've had my G2 since the 9/29 and on several occasions I've noticed the trackpad triggering itself when my finger is no where near it.
Once, I was in the market looking at a list of apps. Normally, when you swipe on the trackpad in there it selects an application and highlights it orange. This randomly happened all by itself. If I touch the screen the selection goes away, but then it would suddenly appear again a few seconds later.
In Subsonic it even jumped around between a few controls.
Another time I was playing Wordfeud and it spontaneously highlighted the Pass button. This time I grabbed my old G1 to shoot video of it happening. I must have shot at least 10 minutes of video and it happened twice more, as I recall.
Update: Here's a video of it happening on the home screen: http://www.youtube.com/watch?v=b9-Yu4DSimw
Anyone else have this problem? I can't reproduce it at will. It seems to happen randomly while I'm holding the phone.
naw, but i've noticed my trackpad will occasionally bring my display back to life when it's timed out - will not do it predictably, but 2-3 times out of 10 tries, it will
have no idea what's going on, but would love to be able to use it to wake the phone up - much easier than using the power button
Hmmm, I have my phone plugged in via USB right now. I have debugging turned on, and "keep screen on" enabled. So it sits there dimly lit after 2 minutes. I was going to leave it alone and see if the trackpad spontaneously moves when I'm not holding the phone.
So far it has not, but just now the screen lit back up to full brightness all by itself. This normally happens when you touch the screen, a button, or the trackpad.
In all previous cases of my bug, I was holding the phone. I heard that the trackpad is capacitive, just like the screen, so maybe holding the phone a certain way can mess with it, but sitting on a desk it won't. If I let the phone sit here long enough, maybe I can refute that idea. If a home screen icon suddenly becomes selected, I'll know that it can happen even when I'm not touching the phone.
In any case, I can't explain why my screen woke back up from being dim.
Yea the touch stuff is set off by heat so maybe it felt some heat from somewhere and thought that you touched it. Thats about all i can think of on that one.
I'm pretty sure it's triggered by electrical capacitance, not by heat. It's either optical or by capacitance (and I heard it's not optical). I don't think any sensors like this use a heat detection mechanism.
To test this, you should be able to hold something cold with a similar capacitance as your skin, like a cold hot dog, and operate the trackpad using it.
See: http://en.wikipedia.org/wiki/Capacitive_sensing
Yes , I noticed mine doing the same thing. If my finger were to hover anywhere near the trackpad it would flash and move around. It doesnt happen all the time but it has happened. I also have had some issues with the sim card and memory card not being read. The memory card I had to put it on my pc transfer all the data, re format and scan the card then reinstall my data to the card. Which has fixed the issue. I suspect a download from the market may have corrupted my memory card.
G2 running stock 2.2
My_touch Slide
rooted
2.2 Cyanogen 6.0 kanged
As promised, here's a video of it happening: http://www.youtube.com/watch?v=b9-Yu4DSimw
So, at first I thought the trackpad was optical, but someone on reddit assertively said, "no, it's capacitive." So I believed him. But now I think he's wrong.
I believe that if the trackpad is capacitive like the touchscreen, then anything that can interact with the trackpad can also interact with the touchscreen. I used a piece of cloth to interact with the touchpad and it did not interact with the touchscreen.
Here's a video I just made: http://www.youtube.com/watch?v=zYaSzwZGlvY
(Shot with my G1) The cloth easily moves the trackpad around, but it's impossible to get it to register a touch on the screen.
Also, the trackpad is perfectly usable even when your finger is completely covering it. Try it with your thumb even. You can completely cover it then still move around your thumb and your selection will move around. I do not believe a capacitive device would detect the difference between full contact on one place on your thumb and full contact on a different part of your thumb, and especially not the direction of change as you move it. Capacitive touch screens rely on moving the point of skin contact, which never happens if you're touching the whole thing at once. An optical sensor on the other hand would be seeing your fingerprint move.
Thirdly, when you look at the trackpad in direct light, it looks like dark, transparent, purple plastic. I believe it's transparent yet purple because the wavelength of light it emits can go through the plastic, but is not visible light. Infrared maybe? Ultraviolet? I think it's very similar to the "black" CDs for the original Playsation gaming console. They were actually very, very dark purple but that was completely transparent to the CD player.
See a photo: http://i.imgur.com/SpIIZ.jpg
Fourth, I can't get this bug to happen if I hold the phone perfectly still. It only seems to happen when I move it around in my hand. I think the sensor is "seeing" movement when I do that.
And here's the proverbial nail in the coffin: http://www.youtube.com/watch?v=GOQukQxwajg
Electrical tape doesn't stop a capacitive touch screen, but it renders the trackpad useless.
It's probably a simple IR LED and photodiode operating in much the same way an optical mouse operates. One way you could check is to point an old camcorder at the trackpad. Old camcorders tend to have weak or no IR filters.
jashsu said:
It's probably a simple IR LED and photodiode operating in much the same way an optical mouse operates. One way you could check is to point an old camcorder at the trackpad. Old camcorders tend to have weak or no IR filters.
Click to expand...
Click to collapse
My old G1's camera has no problem seeing the IR from my TV's remote, but it detects nothing coming from the trackpad. However, the remote is designed to reach a lot further than the trackpad, so maybe the trackpad's LED is just very dim.
I don't have anything else to test it with.
yes, i have had this problem!!...it did it on my home screen, just starts switch home screens left and right...this was like two days ago...it hasn't done it since,still debating if i should get a new phone
The trackpad is optical/IR. It responds to infrared. If you go out on a sunny day, your trackpad will go wild. The new blackberrys have the same problem. I really do not think there is a fix, and it's pretty annoying. I've owned a Blackberry 9700 since January and I never could find a way around this, no matter what sensitivity setting I had it on or how much I updated the OS.
I've noticed the same thing with the G2.. in sunlight, the cursor goes crazy.
If there were ever any sun in Rochester, NY I would test this. I assume It's only a problem if the phone itself is in direct sunlight. Is the the case? So, if I shield it with my own shadow I'd be ok?
Sent from my T-Mobile G2 using XDA App
I just noticed this with my G2, kind of annoying, ha. So I experimented and found that nothing happens while holding the phone still or while it sits on the desk, or with the room's light off. But, if I tilt it around with the light on, it acts up.
I think it's detecting the light behind me.
i think its kinda cool. doesnt bother me cuz it makes my phone feel.... alive in a sense. but it is very light sensitive. im freaking loving this phone. not a single complaint
I may have had a little incident with my Epic where I jumped into a river with it in my pocket..
Now it takes about 10+ seconds to wake.
It actually barely got wet (I didn't completely submerge the phone, and realized what I had done in less than half a second), there was definitely moisture in between the keyboard and screen though. I immediately pulled out the battery and the Florida sun had it completely dry in 30 minutes.
Since then it takes forever to wake. there are no other issues whatsoever that are noticeable, and if the phone is actively doing anything in the background with the screen off (playing music, streaming music, installing stuff, or plugged in) it wakes instantly.
Also if the screen is off and its not doing anything (when usually it would take 10 seconds to wake) and I plug it in before waking it, it will crash and reboot 80% of the time.
annnd if I slide open the phone while its being slow, the keyboard back light will be turned on, though I still wait 10 seconds for the wake.
Running SyndicateRom (latest version), and I have re-installed it freshly, no help.
I have not reset the phone completely where I would have to redo clockwork mod yet. I would have to backup heavily to do that and I have been putting it off thinking it wouldn't help anyway
Any insight guys?
Also, I have SetCPU, and I have made sure that the minimum clock speeds weren't too low, and have jacked them up to 400+mhz even once, and it still would not wake for 10 seconds.
weird thing is that even at that setting, I would still see the speed dip to 100mhz. I know my way around the overclocking software, and I do know it was set properly. Does this happen to others?
Water damaged...
If you remove the battery and look on the opposite side of contact leads, there will be a white sticker, if it's red, then that indicates water damage. Taking it in for repair/replacement at the sprint store will result in charges to you due to it being your fault. YMMV tho
If not, then take it in for replacement/repairs, if you have TEP or under the 1yr manufactures warranty. YMMV also on charges.
Also might want to backup then return to a stock ROM to verify that the issue is hardware related or not.
GL
Yesterday morning my girlfriend knocked over a cup of water off of my bedstand and after wiping up the mess we went back to sleep. I woke up and realized my phone was drenched as a result of this happening, as it was charging in a spot I usually don't put it. I fumble around with it and realize it's messed up pretty bad, though not black screen.
Fast forward to doing the rice treatment and using an un-harmed battery without the pink water damage indicator, all seems good. Phone turns on, runs full speed, plays sound, camera works, data works, etc. This is running task's AOKP.
I use it throughout the next day and then I notice my mobile connection drop completely. This isn't like 1 bar, it's like the triangle logo empty as in no service. Flipping between airplane mode doesn't seem to help like it normally does. Sporadically I'd get a bar with 3G or something.
Then, I flashed the new version of AOKP and upon reboot my phone's data is still not working and the network connection is always dead as well. But, there is also noticeable lag. Pressing the app drawer takes 3 seconds to load and I see the animation in very slow motion. Using a countdown app, it is literally noticeable that seconds are taking substantially longer than they should.
ODIN to complete stock and the lag is still there. Data is in and out. Also if I let the phone sleep, it sometimes either turns off or freezes, I need to take the battery out to boot it again. Basically, something is up - and it's making no sense. My phone is working in slow motion with no mobile data/network after drying out water damage, and flashing new ROM's or ODIN to stock didn't fix anything. I checked APN's, I checked kernel speeds (when it was still on AOKP, right now stock), I checked mobile data on and off, nothing is working. On the off chance I do get lucky and have data + network, I try to make a call and both of them vanish.
I don't think I'll get any help bringing this to ATT cause the indicator on the phone itself is pink, so does anybody here have any ideas on what the heck to do? Being that the issues persist whether I'm rooted or not, custom rom or stock, I believe it's a hardware issue - right?
Yep. Most likely. A trip to repair will most likely be required.
The most common error is trying the phone out after it gets wet.
Best to do is immediately take out the battery, and use the rice, desiccant, blow dryer, whatever method right then.
After a few days of sitting in the rice or silica gel packs (in a sealed bag) THEN try powering it up.
Those first seconds of powered up state with the moisture present are the most damaging.
The best thing to do when a phone gets wet is to immediately disassemble it and clean everything with a high grade isopropyl alcohol. That will get all the moisture out and remobe any corrosion on the boards. I would still take it apart if I were you and let it dry completely for about a day. It may bring it back to life. There may be some water hanging in the antenna wire plug or in the radio itself. Watch some youtube videos on the the disassembly and go slow.
Hi. I am not sure this is the BSOD problem that others have had.
I bought a second hand i747. It came with 4.3. It will work fine for a few minutes when first turned on, then the screen will go dark. The menu and back buttons stay lit, and the touchscreen still works, the LCD just cuts off.
If I hit the power button, it sleeps the phone. When I hit again, the screen will come on, but only for about 5 seconds, then it's black again. Everything works, just black screen.
Is it possible for it to overheat or something? It doesn't feel hot at all, but if I turn it off and leave it for awhile, it will again work for about 2-3 minutes, then only about 5 seconds at a time again.
I swapped batteries, and it's the same. The battery had pink on it. I opened it up, and none of the other stickers showed water exposure, and the board itself was clean.
It has stock 4.3, and is not rooted.
I did go to phone settings and turned off the "darken screen during calls" checkbox.
I am wondering if the proximity sensor heats up and shuts the screen off. Grasping at straws I suppose.
Any idea of how to fix this?
Thanks
Perhaps a bad capacitor in the digitizer/lcd assembly? My TV had an issue with a bad capacitor that would cause the screen to blank out after a few minutes???
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
I'll try swapping boards in it later, and maybe at least narrow down if it's the board or the screen assembly. I have an extra proximity sensor I could swap, but it doesn't seem like it's that to me.
thanks, will post more after the board swap
Update: I switched boards (different carriers), and I could not replicate the problem in either phone. I had hoped that would show that either the board or the LCD assembly was bad, but I didn't learn anything useful either way.
I put the boards back in their respective bodies. It still happens now, but not as often. It also appears to be totally random. I did switch batteries in the problem phone, and it doesn't seem as bad. I will try another battery switch and see if that helps it more.
When the screen goes dark, the menu and back buttons are lit. When it went out last night, I could see that there was still some faint background light that I can't see in the day. I pulled up Youtube and did a video, and when the screen went dark, I could still see movement, but couldn't make anything out. So, the phone is still going in the background.
If I push the power button, it sleeps, then push it again, and it wakes up just fine. Sometimes I have to do that 4 or 5 times for the screen to stay on. Sometimes it goes dark after 10 minutes of use, sometimes a half hour, sometimes just a few.
Any help is appreciated.
Well, right before throwing the phone into the wall, I noticed a partially removed liquid exposure indicator. I pulled the phone apart to check the motherboard.
In the process of taking it apart, I forgot to take out the SD card. In so doing, it pulled the sim/sd card module off the motherboard. Low and behold, there was a very light corrosive glaze in a few spots under the module.
So, I got out the 99% IPA, and a toothbrush, and cleaned the whole entire board. Since then, it seems to be working fine.
I don't know exactly what part getting cleaned fixed it, because I just cleaned the whole board.
Anyways, maybe that'll help someone with inexplicable issues downstream.
Thanks for following up with how you fixed the problem. In retrospect, water damage makes sense.
I dropped a Captivate into an ice chest full of melted water last year. I immediately pulled it out and the phone was mostly okay for a while but then the microphone didn't seem to work so well and occasionally the right third of the screen wouldn't respond to touch until I cycled the screen on and off. The water damage sticker and phone interior showed no signs of water.
I will probably sell the old captivate but with full diclosure about the history. Would have been nice if the seller had done the same for you.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Thanks, I should have thought of it sooner, but it didn't seem to have any signs of water damage otherwise.
I ordered the 99% IPA online, because I couldn't find any locally. It works wonders with previously wet boards. You might be able to bring it back.
I got this White HTC One X from a friend who dropped it in the waters.
It boots up just fine, the digitizer works, as well as... partially... the screen
Now i got the data from it, so mission accomplished in terms of data loss. He gave it to me for free so i rooted it with the bad screen.
So now i have this rooted phone running latest stock ROM.
The screen's brightness is too low even though the brightness settings is set to maximum. After a hellova lot of testing i found out that when the device is cold, the brightness increases when i turn the screen on. And when the processor is running (ie opening an app, or rendering animations), the screen's brightness starts to get lower and lower until it just completely shuts off.
What i did was put it in the freezer to make it REALLY cold, and it works just fine for like 5 minutes until the CPU gets hot again and the screen turns black.
I tore it down, and changed the screen, but the problem is still there, so it must be some part of the motherboard.
I won't change all the motherboard because honestly i don't want to spend that much money on something older than my nexus 4
So if anyone can tell me what part exactly is responsible for the brightness IN THE MOTHERBOARD, so that i can find a way to keep it cold, it'll be very much appreciated.
PS: I can see and control everything from PC too when the screen shuts off... so i can still practically try and do anything with it. Also, the actual LCD screen is cracked and black on it's right and bottom half, and it's currently "half open" (ie i can see the Nvidia CPU, and the vibration motor under the screen)