Develop Bugs

[Q] A100 Powers OFF when charger is connected.

Recently successfully replaced the LCD screen on my Acer A100. Device worked fine for some time after that repair. Wanting to get a secondary charger for use at work I went to radio shack. Sales "tech" tried several different adapters, found one that fit inside he port, but wiggled. She plugged it in but device wasn't showing a charge. Decided to order one from online. At home the device still would not charge with its own charger. Thought maybe the charger was faulty. Ordered two more. Still the A100 turned off when charger plugged in. Figured tech had burned out the a/c port. Ordered and installed a new one. Still A100 turns off immediately when charger is plugged in. I have 3 chargers now - same results with all 3. Have now ordered a docking station to utilize (hopefully) charging ability through 40 pin connector.
If this connection creates same shut down am I looking at a battery replacement? AM sitting at 33% battery level now, device shut down completely.
Acer wants 199.00 prepaid to submit to them for repair - this is more than I paid for the device! Not really an expense I am willing to pay if all it needs is a battery. There is no erratic behavior , just immediate shutdown as soon as a charger is connected. Any ideas?

PocketFuzz said:
Recently successfully replaced the LCD screen on my Acer A100. Device worked fine for some time after that repair. Wanting to get a secondary charger for use at work I went to radio shack. Sales "tech" tried several different adapters, found one that fit inside he port, but wiggled. She plugged it in but device wasn't showing a charge. Decided to order one from online. At home the device still would not charge with its own charger. Thought maybe the charger was faulty. Ordered two more. Still the A100 turned off when charger plugged in. Figured tech had burned out the a/c port. Ordered and installed a new one. Still A100 turns off immediately when charger is plugged in. I have 3 chargers now - same results with all 3. Have now ordered a docking station to utilize (hopefully) charging ability through 40 pin connector.
If this connection creates same shut down am I looking at a battery replacement? AM sitting at 33% battery level now, device shut down completely.
Acer wants 199.00 prepaid to submit to them for repair - this is more than I paid for the device! Not really an expense I am willing to pay if all it needs is a battery. There is no erratic behavior , just immediate shutdown as soon as a charger is connected. Any ideas?
Click to expand...
Click to collapse
If its doing it on 3 chargers its sounding more like a board charging circuit issue. You could remove the battery and then see if it behaves normally, that'll be battery or board right there. Or if you have a multi meter test output at the battery connector.
Tapatalked from my HTC DNA - ReVolt

Tried connection without battery
pio_masaki said:
If its doing it on 3 chargers its sounding more like a board charging circuit issue. You could remove the battery and then see if it behaves normally, that'll be battery or board right there. Or if you have a multi meter test output at the battery connector.
Tapatalked from my HTC DNA - ReVolt
Click to expand...
Click to collapse
Don't have a multi meter. Tried connection via new docking station, got same response: device immediately shut off. Tried your suggestion, disconnected battery connected to docking station, got immediate shut off. Same with charger via a/c port. :crying: Mainboard is out? But Device responds and acts normal when in battery mode - or is this isolated to the charging circuit part of the main board?
Thanks for the suggestion!

PocketFuzz said:
Don't have a multi meter. Tried connection via new docking station, got same response: device immediately shut off. Tried your suggestion, disconnected battery connected to docking station, got immediate shut off. Same with charger via a/c port. :crying: Mainboard is out? But Device responds and acts normal when in battery mode - or is this isolated to the charging circuit part of the main board?
Thanks for the suggestion!
Click to expand...
Click to collapse
Sounds like its tripping on the charger circuit and cutting out, like a breaker tripping. IMO look carefully for any shorts on the boards, even something stupid like dog hair can cause strange things to happen. A good blasting with air wouldn't hurt either. It could even be the dock port as it does charge from there and is subject to debris also.
Tapatalked from my HTC DNA - ReVolt

one more try
pio_masaki said:
Sounds like its tripping on the charger circuit and cutting out, like a breaker tripping. IMO look carefully for any shorts on the boards, even something stupid like dog hair can cause strange things to happen. A good blasting with air wouldn't hurt either. It could even be the dock port as it does charge from there and is subject to debris also.
Tapatalked from my HTC DNA - ReVolt
Click to expand...
Click to collapse
Thanks again for more suggestions. Yup I have been over the board and all connections with a looking glass. Changed out the A/C dock port. My suspicion is that when the Radio Shack tech powered up the "Almost fits" adapter it blew whatever breaker the board has.
When I had it connected to the docking station with the battery disconnected, it powered on, then immediately shut off. So this definitely sounds like a "blown fuse". I completely disassembled and reassembled it again (except for the LCD screen) and checked all connections and plugs. Nothing visible to indicate a burnout or cross connection.
No odd smells either. Probably some teensy weensy transistor or resistor or something. I am not an electrician - just good at R & R.
Another visit to ebay and I am parting with 50 bucks for a "factory refurbished" motherboard. In the mean time, my beloved tablet will await further surgery. Will keep you posted. Board should be here by Saturday. I hope so - battery is down to 27%. Thanks again for weighing in!

PocketFuzz said:
Thanks again for more suggestions. Yup I have been over the board and all connections with a looking glass. Changed out the A/C dock port. My suspicion is that when the Radio Shack tech powered up the "Almost fits" adapter it blew whatever breaker the board has.
When I had it connected to the docking station with the battery disconnected, it powered on, then immediately shut off. So this definitely sounds like a "blown fuse". I completely disassembled and reassembled it again (except for the LCD screen) and checked all connections and plugs. Nothing visible to indicate a burnout or cross connection.
No odd smells either. Probably some teensy weensy transistor or resistor or something. I am not an electrician - just good at R & R.
Another visit to ebay and I am parting with 50 bucks for a "factory refurbished" motherboard. In the mean time, my beloved tablet will await further surgery. Will keep you posted. Board should be here by Saturday. I hope so - battery is down to 27%. Thanks again for weighing in!
Click to expand...
Click to collapse
To bad considering the crappy battery life so its not like you can charge some other way and swap the battery around.
Example, I have a bricked unit that charges but doesn't otherwise work, so I mean using my bricked board to charge it and the non charge board for use. The a100 isn't really a good setup for swapping around lol. I may actually be interested in that board now that I think about it...
Tapatalked from my HTC DNA - ReVolt

hmmm an idea for the brave
pio_masaki said:
To bad considering the crappy battery life so its not like you can charge some other way and swap the battery around.
Example, I have a bricked unit that charges but doesn't otherwise work, so I mean using my bricked board to charge it and the non charge board for use. The a100 isn't really a good setup for swapping around lol. I may actually be interested in that board now that I think about it...
Tapatalked from my HTC DNA - ReVolt
Click to expand...
Click to collapse
If I could figure out a way to charge the battery OTHER than through the board - I would! Which got me to thinking. One COULD get a second rear panel, cut a door in it, install teensy weensy hinges or create a hinge with cloth tape. then make some sort of extension cord for the battery charging cord, plug it in to the "external" charging board and refill the battery that way.
With a working board and the right know how, one could just extract the board, put it in a box and make a charger out of it too.
But that is just my brain rattling around ideas. :silly: Hopefully this new "refurbished" mother board will do the trick and I will learn my lesson and NEVER let a sales "tech" attempt trial adapters! at 10 minutes to 9pm tonight it was in Texas....
Until I CANNOT use it, I didn't realize how MUCH I used this little tablet!

now it blinks orange?
Oh fer cryin out loud! The motherboard has arrived, I have installed it. Can plug n the charger and drop it onto the docking station and now I get the same response for both charging options: Charge LED lights up orange solid for just about 60 seconds, then begins blinking. Device doesn't respond when power button is pushed UNLESS it is plugged in, and then it just sits at the "ACER" screen.led changes to blue.
OK, wait a minute, this is the third time I have turned it on while plugged in. Acer screen has moved to Android, Device has started. Battery icon showing a question mark. 23%
Turned off, turned back on, now battery shows only 3%????
Think I saw something on the forums about that. will go on a quest.

Finally charging again!
Shhh, don't want to disturb my device....
Found folks on other forums with similar issues of the Acer A100 tablet showing only 3% charge. I removed and inserted the charging pin several times, the device would show solid orange led for about one minute then start blinking. Turned the device on when charger plugged in, unlocked the screen, then with device still plugged in I shut it down completely. Removed charger. Plugged it back in and so far the led is staying at solid orange.
Please keep your fingers crossed for me! This has been quite the roller coaster ride of discovery. Will leave it be for overnight (what is left of the overnight). Then peek at it in the morning. With any luck at all it will have accepted a full charge and I will be greeted with a functioning device! I almost want to learn a new trade..
well now that is weird, got up this morning to a nice blue charge indicator. Yay! Unplugged charger, press on button, hold, hold, hold, hold, hold and device does not start up. Dang it! Plugged it back in, led went solid orange, then started blinking again! Pressed and held on button. Device came on. battery meter shows 3% and a question mark! HUH?
have device plugged in, settings of course show android version 3.2.1 for this motherboard. Guess I need to upgrade it to ICS maybe that will resolve this weird battery issue? Hope soemone here has ideas, feels like I am soooo close to resolving this.

I read the upper posts.
Now I want to share my experience regarding battery load sharing:
I have allso problems to charge the battery.
I have on my tab, for example, 40% of battery power.
I turn my tab off.
When i plugged the charging cable in it shows me the orange led for load.
After two hours or more i turned the tab on.
It shows me not more than 40% but only 37% or so.
So not loaded. This was a bad sign....
I dont no was happend.
I get a little bit nervous but when the tab not get power it doesnt work....
After two/three hours the battery was empty.
Now i can only start my tab while plugged the charging cabel in because the battery will not load.
I have tried several options to find a solution (disconnect the battery, install a new battery, etc. ....).
My solution was fairly straightforward:
I open the tab. Look where the power comes in.
Of the charging socket go four (two red and two black) cable to the motherboard and from the motherboard it goes seven (two red, two black and for me not so important three other coloured cabels) to the battery.
I organized four thin wire and soldered it from the charging socket directly to the battery (of course red to red black to black ).
The result:
When i plugged the charging cabel in while android is running i get no information to load and it shows me not to.
But when i turned the tab off and on again it shows me that it has the battery charged :fingers-crossed: .
After on night while the charger plugged in the battery is fully loaded!!
And of course i get the information in android the discharging of the battery but this is an normaly thing!
So, the problem to load the battery for me is solved .
I hope it helps a little bit for everyone!

frischeis said:
I read the upper posts.
Now I want to share my experience regarding battery load sharing:
I have allso problems to charge the battery.
I have on my tab, for example, 40% of battery power.
I turn my tab off.
When i plugged the charging cable in it shows me the orange led for load.
After two hours or more i turned the tab on.
It shows me not more than 40% but only 37% or so.
So not loaded. This was a bad sign....
I dont no was happend.
I get a little bit nervous but when the tab not get power it doesnt work....
After two/three hours the battery was empty.
Now i can only start my tab while plugged the charging cabel in because the battery will not load.
I have tried several options to find a solution (disconnect the battery, install a new battery, etc. ....).
My solution was fairly straightforward:
I open the tab. Look where the power comes in.
Of the charging socket go four (two red and two black) cable to the motherboard and from the motherboard it goes seven (two red, two black and for me not so important three other coloured cabels) to the battery.
I organized four thin wire and soldered it from the charging socket directly to the battery (of course red to red black to black ).
The result:
When i plugged the charging cabel in while android is running i get no information to load and it shows me not to.
But when i turned the tab off and on again it shows me that it has the battery charged :fingers-crossed: .
After on night while the charger plugged in the battery is fully loaded!!
And of course i get the information in android the discharging of the battery but this is an normaly thing!
So, the problem to load the battery for me is solved .
I hope it helps a little bit for everyone!
Click to expand...
Click to collapse
I really hope other isn't any voltage or amperage changes needed of that can blow that battery up real quick, plus it can't stop charging, you'll need to monitor that yourself.
Thanks for the info though, it does appear to be yet another somewhat common bug these have that can be addressed by a user if they feel the need to.
Tapatalked from my HTC DNA - ReVolt

Not switch the charger off when the battery is full?
I think the charger there is a shutdown would otherwise overload the battery, right?
Or do this the motherboard?
Anyway, for me the tab is fully working now and if the battery is broken, it is not a big expense to replace them .

frischeis said:
Not switch the charger off when the battery is full?
I think the charger there is a shutdown would otherwise overload the battery, right?
Or do this the motherboard?
Anyway, for me the tab is fully working now and if the battery is broken, it is not a big expense to replace them .
Click to expand...
Click to collapse
I was saying the board is in charge of cutting the battery charge off, not the charger itself so maybe keep an eye on it, its a good way for an explosion or fire.
Tapatalked from my HTC DNA - ReVolt

A100 tablet not charging still
Frischies is much braver than I am.
Wiring the battery direct to the charging port- I would definitely worry about burning up the battery or causing a fire - especially while charging when I sleep. I have had more than my fair share of run ins with fire.
The Motherboard I ordered arrived and I installed it. It was listed as "factory refurbished", but unfortunately will not accept a charge. I thought it had charged overnight at one point, but all it does is blink orange and the battery reads 3% or 0%. Turning the device off when plugged in and doing a reset has not helped. The vendor has been gracious to do a replacement, so I will follow that route until I get a working motherboard.
I have discovered that the docking station will be a welcome addition to my Acer tablet paraphernalia! Although this model docking station isn't the one that allows HDMI throughput, it still will be nice for music, and other media. A Bluetooth keyboard and the tablet will offer yet another computer tool!
First things first though, get the tablet to accept a charge - until then it is a really wide flat paper weight! I am getting VERY adept at opening the tablet and removing the internals!

It is working again! The motherboard sent was defective but vendor issued an RMA. Received the replacement yesterday, installed it last night. Charged over night and fully functional this morning! Ahhh it feels good to have my little buddy back again. Didn't realize how much I used it, until I couldn't use it! Thanks to all for the help.
Sent from my A100 using xda app-developers app

Possibly fried Nexus 7 2013

This is my older son's N7. A week ago he was playing some dumb game and it froze on him. He, intelligently, immediately restarted the N7 and continued to try to play. This happened about 7 times. The last time he said the screen glitched and it turned off. He then plugged it in and it got very hot according to him, for how long I don't know.
So now I took it apart. The battery was 3.4v-ish and not charging, so I hooked the usb up to it directly and charged up to 4.09v and tried. Still won't turn on (and yes I tried all combination of buttons and lengths). Plugged in the usb, tried again, no luck. But I did notice the qualcomm chip getting very hot very fast.
So what is the next step here? I cannot find a lot of information on this as 99.9% of the time someone just ran their battery completely dead and jumpstarted it back to life. I don't have access to proper reflow equipment so thats off but I'm not against a ghetto heatgun reflow. This thing is long out of warranty so I'm willing to try some invasive tricks on it.

Connect it to a PC and check if a new USB device, id 9008, has been registered. If so, the eMMC chip is gone - more info in the link in my signature. Then in the linked thread please post the maker of your eMMC chip for our statistics.

A bit more info...
I accidentally left the battery plugged in and it drained down to 0.2v , just by sitting there. Hoping it was a battery issue and to kill 2 birds with one stone I ordered a new battery which came in today, plopped it in and... nothing. I tested the battery and it had a charge but it just did the same thing again.
Nothing turns on. The qualcomm chip (or that area in general) heats up, I'm assuming its just sitting there eating the battery. Plugging it in doesn't help (tried 3 chargers, various amps) and it doesn't charge the battery. Last I checked after "charging" a few hours the battery was down to 3.3v , now it's just sitting there unplugged from the motherboard to prevent further damage.
And to answer your question "Connect it to a PC and check if a new USB device, id 9008...", watching "dmesg -w" in linux, not even a blip.
I don't want to keep buying random parts that don't fix the issue and my google-fu failed me in finding any real hardware level testing. So how do I find out what the problem is here?

baconbacon said:
This is my older son's N7. A week ago he was playing some dumb game and it froze on him. He, intelligently, immediately restarted the N7 and continued to try to play. This happened about 7 times. The last time he said the screen glitched and it turned off. He then plugged it in and it got very hot according to him, for how long I don't know.
So now I took it apart. The battery was 3.4v-ish and not charging, so I hooked the usb up to it directly and charged up to 4.09v and tried. Still won't turn on (and yes I tried all combination of buttons and lengths). Plugged in the usb, tried again, no luck. But I did notice the qualcomm chip getting very hot very fast.
So what is the next step here? I cannot find a lot of information on this as 99.9% of the time someone just ran their battery completely dead and jumpstarted it back to life. I don't have access to proper reflow equipment so thats off but I'm not against a ghetto heatgun reflow. This thing is long out of warranty so I'm willing to try some invasive tricks on it.
Click to expand...
Click to collapse
What do you mean "so I hooked the usb up to it directly and charged up to 4.09v and tried" ? I once soldered a micro usb port directly to the motherboard for charging and in doing so inadvertently created a short between the id wire and a tiny component. Result: CPU heating up quickly and no sign of life. Eliminated it and it was back to normal. If you have done any soldering, check carefully for possible shorts. Some require a magnifying glass (mine was 10X) to be visible. I've not heard many cases of battery suddenly gone dead with this model.

graphdarnell said:
What do you mean "so I hooked the usb up to it directly and charged up to 4.09v and tried" ? I once soldered a micro usb port directly to the motherboard for charging and in doing so inadvertently created a short between the id wire and a tiny component. Result: CPU heating up quickly and no sign of life. Eliminated it and it was back to normal. If you have done any soldering, check carefully for possible shorts. Some require a magnifying glass (mine was 10X) to be visible. I've not heard many cases of battery suddenly gone dead with this model.
Click to expand...
Click to collapse
usb wires connected directly to the battery itself, at no point was anything plugged into the motherboard. Also I have done no soldering to the mb so there is nothing to look for in that regards unfortunately.

baconbacon said:
I accidentally left the battery plugged in and it drained down to 0.2v , just by sitting there.
Click to expand...
Click to collapse
Please disconnect everything from the motherboard except for the battery. If the chip still gets hot and the battery drains down then the mobo is faulty and you can replace it for around $25 http://www.ebay.com/itm/121637666631
I see no hope of component-level mobo repair because N7-13 has no available circuit diagram.

Finally got around to doing this. Everything disconnected, connected the battery and within about 10 seconds the qualcomm chip is too hot to touch. These chips run hot (or so I've read) so what are the odds it desoldered/fried itself?

Red led of death

Hi all, my Nexus 5x wont charge but Red led is blinking and then nothing happens, I broke the originale LG type c cable and I left the phone discharged for 5-6 days until the new cable come, and now It wont boot nor charge with no cable or Wall charger combination, searched on web and found people saying to let It in charger overnight then try booting and similar things but nothing is working.
anyone here got this problem?:crying:

Hi, I had the same issue... and charging overnight will not fix your problem....
it happened 5/6 times to my phone, the only way to make it works, was to pull out- pull in the original charger, and after 10/20 times you do this, it will work again.
I bring it to LG assistance and they told me that sometimes, all the updates and the full memory (mine was not full, but 17gb over 32) made this. I didn't believe that, BUT an hard reset of the phone and it never happened again in 3 months
Hope it will work for you too

dimostar said:
Hi, I had the same issue... and charging overnight will not fix your problem....
it happened 5/6 times to my phone, the only way to make it works, was to pull out- pull in the original charger, and after 10/20 times you do this, it will work again.
I bring it to LG assistance and they told me that sometimes, all the updates and the full memory (mine was not full, but 17gb over 32) made this. I didn't believe that, BUT an hard reset of the phone and it never happened again in 3 months
Hope it will work for you too
Click to expand...
Click to collapse
Thanks, I will try, but how much time do I have to wait before pulling out and pull in again the charger?

Can anyone help me please?

I had the same. I forget about phone and left it with TWRP running. It drained all my battery and phone wont turn at all. I had this same red LED, so i plugged phone to charger and after maybe 2 hours it turned back on (charging screen), wnother hour and my nexus was fully restored with full charge.
Also i recommend you to get original charger and original usbc cable. Also before it you can hold power button for 30 sec. In some Xperia phones even a few days can do a trick.

Finally understanded the problem Thanks to "Dusan Milanovic"
In my case it was:
- 50% Battery problem
- 50% Qualcomm Power IC Chip
How I solved it:
I AM NOT RESPONSIBLE FOR EVERY DAMAGE YOU MAKE TO YOUR PHONE, HOUSE, GRANDMA.
REQUIREMENTS:
- Alluminium foil (biscuit metallic paper) not plastic
- Hairdryer (It seems stupid ahah)
- Chronometer
- Attention!
- A bit of patience
BATTERY PHASE
- Open the Phone and remove Fingerprint board.
- Remove the Battery.
- Put the battery on an universal charger.
(do this only if you are sure that the battery is discharged and don't want to charge)
Let it charge for an hour more and less.
POWER IC CHIP. PHASE
- Remove the metallic protection between the camera and the battery slot.
- Look for a black chip surrounded by little grey chips. (POWER IC)
- Protect everything in the motherboard with the Alluminium foil except for the black chip.
BE VERY CAREFUL, PROTECT EVERY SINGLE GREY CHIP NEAR THE POWER IC CHIP.
-Prepare the Chronometer 1 minute.
(NOT MORE THAN 2 MINUTES OR YOU MAY SERIOUSLY DAMAGE THE MOTHERBOARD)
-Use the Hairdryer to heat the POWER IC CHIP
(DO NOT USE HEATGUN). The chip needs to reach around 100°C
-After you heated the chip let it cool down for a minute or two
-Remount the metallic protection.
LAST PHASE
- Put the battery on the phone
- close everything
- Try to boot it
ALL DONE?:highfive:
POSSIBLE PROBLEMS
- always shows 100% battery. → buy a new battery( this one is Dead)
-Doesn't boot.↓
→Are you sure your battery is charged?
No: charge it externally (BE VERY CAREFUL THIS COULD BE VERY DANGEROUS)
Yes: then try to heat again the POWER IC CHIP (2 MINUTES MAX)
→Still nothing?
- Buy a new Battery, this is the best choice.
- If even after you use the new Battery the Phone doesn't boot , just heat again that pain in the ass of a ic CHIP.

MounirHero said:
Finally understanded the problem Thanks to "Dusan Milanovic"
In my case it was:
- 50% Battery problem
- 50% Qualcomm Power IC Chip
How I solved it:
I AM NOT RESPONSIBLE FOR EVERY DAMAGE YOU MAKE TO YOUR PHONE, HOUSE, GRANDMA.
REQUIREMENTS:
- Alluminium foil (biscuit metallic paper) not plastic
- Hairdryer (It seems stupid ahah)
- Chronometer
- Attention!
- A bit of patience
BATTERY PHASE
- Open the Phone and remove Fingerprint board.
- Remove the Battery.
- Put the battery on an universal charger.
(do this only if you are sure that the battery is discharged and don't want to charge)
Let it charge for an hour more and less.
POWER IC CHIP. PHASE
- Remove the metallic protection between the camera and the battery slot.
- Look for a black chip surrounded by little grey chips. (POWER IC)
- Protect everything in the motherboard with the Alluminium foil except for the black chip.
BE VERY CAREFUL, PROTECT EVERY SINGLE GREY CHIP NEAR THE POWER IC CHIP.
-Prepare the Chronometer 1 minute.
(NOT MORE THAN 2 MINUTES OR YOU MAY SERIOUSLY DAMAGE THE MOTHERBOARD)
-Use the Hairdryer to heat the POWER IC CHIP
(DO NOT USE HEATGUN). The chip needs to reach around 100°C
-After you heated the chip let it cool down for a minute or two
-Remount the metallic protection.
LAST PHASE
- Put the battery on the phone
- close everything
- Try to boot it
ALL DONE?:highfive:
POSSIBLE PROBLEMS
- always shows 100% battery. → buy a new battery( this one is Dead)
-Doesn't boot.↓
→Are you sure your battery is charged?
No: charge it externally (BE VERY CAREFUL THIS COULD BE VERY DANGEROUS)
Yes: then try to heat again the POWER IC CHIP (2 MINUTES MAX)
→Still nothing?
- Buy a new Battery, this is the best choice.
- If even after you use the new Battery the Phone doesn't boot , just heat again that pain in the ass of a ic CHIP.
Click to expand...
Click to collapse
I followed you steps and successful got it to work , but now it is showing that charger is pluged in but not charging, the charging symbol comes bit of does not charge , I even went into cpuid and saw that the status was not charging but plunged in ac power , I am ready to buy a new a battery but will it solve my issue of is it a pin connector issue

dimostar said:
Hi, I had the same issue... and charging overnight will not fix your problem....
it happened 5/6 times to my phone, the only way to make it works, was to pull out- pull in the original charger, and after 10/20 times you do this, it will work again.
I bring it to LG assistance and they told me that sometimes, all the updates and the full memory (mine was not full, but 17gb over 32) made this. I didn't believe that, BUT an hard reset of the phone and it never happened again in 3 months
Hope it will work for you too
Click to expand...
Click to collapse
MounirHero said:
Thanks, I will try, but how much time do I have to wait before pulling out and pull in again the charger?
Click to expand...
Click to collapse
I got the same issue tried changing battery but nothing changed
When phone turns on backup your files when you are in time

dimostar said:
Hi, I had the same issue... and charging overnight will not fix your problem....
it happened 5/6 times to my phone, the only way to make it works, was to pull out- pull in the original charger, and after 10/20 times you do this, it will work again.
I bring it to LG assistance and they told me that sometimes, all the updates and the full memory (mine was not full, but 17gb over 32) made this. I didn't believe that, BUT an hard reset of the phone and it never happened again in 3 months
Hope it will work for you too
Click to expand...
Click to collapse
HARD RESET instructions or link you followd that worked drop below

I just had the same thing happen. Using the original charger I kept on charging then trying again and again. I would leave it overnight unplugged from the charger. I think the battery was draining due to screen not coming on but phone booting over and over. Finally after about 6 times, I saw a battery symbol, then pressing power it came on as if everything was just fine.

I found another way, though be careful. Repeatedly unplugging/replugging did not help. Disassembled phone (lots of guides), unplugged battery. Measured 2.96v - too low for lipo. Used lipo charger (100mah) to boost charge to 3.2v. Reassembled, and it charged OK.
Cause is probably voltage dropped below the low charge threshold for lipo charging cct onboard. Lipos are very tricky to charge - lots of papers on this. In theory Nexus should have shut itself down before voltage dropped that low - but it didn't. Design flaw.

i had red blinking but battery was empty.
since in bootloop it will not charge, after i repaired reflow and patched the boot
to 4 core it worked perfect.
so if someone comes here and wonders, it might not be the charging chip
just the battery empty

How to diagnose hardware when the display is not working?

Hi,
My son dropped the device in drinking water. I opened the case, separated the battery, and kept the device inside rice for 3 days straight. Now, I don't see any trace of water. When connecting the USB cable, with ultimeter, I see the battery charging. I connect the battery and try to turn it ON. The device responses with vibration and the display back light is lit. However, there is nothing in the screen, it's completely off. The screen back light is always ON when charging.
How to diagnose the hardware in this condition (as the display is not working)? Is there any PC application for this device that can do the full hardware test? What should be my next steps to figure out what might be broken?
Thanks in advance.

No sign of life after battery change

I recently got a Nexus 5X that was not booting, but showing blinking red LED when plugging it in into a charger or a computer. Leaving it charging never changed anything, so I decided to change the battery. But now it's worse.
Changing the battery was fairly easy. But now the phone is not showing any sign of life when plugging it in, either charger or computer. Windows doesn't detect anything. I was able to check the voltage on the old vs new battery, the old shows 0v, the new, 4.21v. So I believe the new battery is alright. I tried plugging the old battery in but it doesn't do anything anymore, no LED blink. Although before the battery change, sometimes the LED would no blink at all for a while.
Anyway, if anyone has an idea of something to try out, let me know. I'm kind of sad this didn't work. And I have a new battery which I can't do anything with.

Check the ribbon cable connections.
Is the power switch good?
Sounds like a mobo failure. Any water exposure or hard drops?
Meh, troubleshooting isn't always free...

No sign of water exposure, the phone was well taken care of. The power button feels alright, I can feel it click properly, just like the sound buttons do, not sure if there's something else I should try there.
I'll have a look at the ribbon cables again tomorrow, fresh head, might help.
I hate e-waste like that but I guess it's not avoidable anymore

That's good news, things may not be so bad. Failures happen through no fault of your own sometimes.
Try another cable.
Check the switch assembly with a ohmmeter if possible.
C port PCB failure?
That pcb can cause bizarre symptoms when it fails on some phones. Examine it closely for cracked solder joints. It gets stressed a lot.
Play with it... and no harm in putting it down for a bit and thinking on it.
Double check everything from when you replaced the battery. Are all connectors intact? No bent contacts? All properly seated? All ground paths intact? Use a good point source light and magnification to examine it carefully.
Do a Google search for similar reported failures with that model or series.

I also have same issue. Phone was lying in drawer for 2-3 months because display stopped working, after replacing the display, phone has no led nothing no vibration, won't start at all. Bought replacement battery but still same. It was fine before but display became faulty, and it was still charging and turning on before that.