[Q] D800 blank at times, other times stuck at Logo? - G2 Q&A, Help & Troubleshooting

I just bought this form a guy who said he did a restore and it never booted again except to the boot logo.
I have only got it to boot to the logo twice, mostly it won't do anything and when the logo is present the computer does not know what it is, when the logo is not present the computer (pc) does not see it at all.
It will not go into recovery, it only goes into the LG logo screen occasionally, it booted to a blue screen twice?
No water damage, no tampering except by me to disconnect the battery.
It seems to be charging because it gets warm and there is never any charging light.
I have two different factory chargers and cables and the drivers on my pc see my friends G2 without issue.
Any ideas?

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[Q]Phone stuck at boot logo and start to overheat

Whenever I switch off my S4 GT-19506,it will automatically switch back on by itself , gets stuck to the 'Samsung' boot logo and gets really overheat. My phone isn't rooted so may i know why its behaving like this?
My guess would be that your usb port is dirty. Probably some oxidated water or something.

Stock S4. Odin works. No access to recovery mode. Stucks at boot. Power button OK.

I did not find anyone with exactly the same symptoms. So I started a new thread.
My wife's stock unrooted S4 GT-i9505 with 5.0.1 android does not start anymore. No custom roms or odin tricks were ever done to the phone. Phone does not get past the first Samsung GT-I9505 text. It does not load the graphical Samsung boot animation. Recovery is not accessible. Only once I have gotten to see a glimpse of recovery screen, but then display got striped and phone froze.
I can get to bootloader and I tried to use Odin to load stock 5.0.1 rom. I loaded rom with default values, odin passes and then phone reboots. Again phone gets stuck on the Samsung GT-I9505 text display.
24month warranty has already expired, so when i remembered, that phone has had issues with power button previously, I ordered new and changed it. No changes to situation.
Another strange thing is, that if I do not start the phone, but just plug usb in, the charging symbol is static grey. I read in one thread, that maybe USB port was faulty interfering the charging and resulting to always empty looking static grey battery. However, the port actually charges the battery. I put the battery to external charger and charger reported that battery was full. I ordered new port. It has not yet arrived. Relatives have S4's so having a spare won't do any harm if the port swap does not help here.
My wife said that phone was very laggy just before it died. When I think the artifacts I see on screen sometimes and then
the fact that bootloader display displays without artifacts just fine, my thoughts start to concentrate to display chip. None of the screens that now work and show have any 3D or animations on them. Charging screen has animation, but phone becomes unresponsive as soon as that screen shows. Recovery screen has animated android figure when it loads and I have once seen a glimpse of that figure before display corrupted. Display also has once corrupted (noise/lines) with the battery recharging screen. The screen that comes after Samsung... text has animation and phone freezes just before that.
Any thoughts? Has anyone had exactly the same symptoms?
Well, yeah, it sounds like a hardware problem. Most probably the motherboard will have to be replaced. If you think it's worth it.

Samsung SM-T230NU : Won't boot, keeps flashing boot logo

So, I have a Samsung SM-T230NU. When I tried to power it on, it flashed for a split second the Samsung Galaxy Tab 4 logo and then went blank. I figured it was out of juice, so I plugged it in and let it charge for an hour or so.
When I came back, it was flashing and going dark.
I tried a different cable. As soon as power was applied, it flashed and went dark again.
Now, the boot logo is showing for an even briefer amount of time.
I am suspecting the battery or USB port. I don't have parts readily available to swap, however.
It may be worth adding, when I plug in the device, without touching any buttons, the screen starts flashing the Samsung Galaxy Tab 4 boot logo. I would guess a stuck power button, but the power button travels freely. When I unplug the tablet from the computer, the flashing stops.
Trying to boot it with power + volume up garners no response from the device.
Any ideas?
Having same issue here
Tried hard reset, no dice.
Tried opening the back to see if I can identify some loose connection, didn't see anything funny. I am not an electrician.
My sister's having the same issue with her T230NU. It still boots (it'll boot to the Samsung splash, but then it flashes off the screen in half a second; this repeats every 7 seconds), but only if it's plugged directly to the wall charger. She let it sit overnight to charge, and it's still got this issue. I'm pretty sure her battery was drained when the issue started occurring last night, but it doesn't look like the battery has charged much (if at all) since then.

LG g2 Shows 0% battery after lcd and digitizer replacement and turns off

I finally got the right digitizer for my LG-D802, and when I turn it on it will either go through the boot process, and then show 0% battery and tell me it's turning off because of the battery, or do a boot process with what looks like a buffering logo animation followed by a regular speed animation,led light flashes green and blue and then back to the 0% battery and turn off. If connect it with charger turns on by it self and the boot logo runs like slow motion,after some time reboot and does bootloop.
I can get it to firmware download mode, and cannot get it to factory reset. I also cannot get my win 7 to see the phone after trying tons of different drivers.
Please help

Lumia 950 Not Working

Hello Everybody.
I Need some help with my Lumia 950, it's in Boot Loop, Going to Windows Logo and Restarting.
I Already used many ways to factory reset or flash the device, using WDRT, WPinternals, Windows Phone Image Designer, thor2.exe and more.
All the times the flashing process goes well and it finishes the process showing a green screen after the flashing and starting the boot process, going to Microsoft logo, windows logo, windows logo again and just after, the screen goes black and the phone vibrates and restart.
I Really need some help, it's happens when i was recharging the phone at my workstation, it was with 8% battery, so i put the charger (from Sony Brand) and when i came back to check my phone, it was in boot loop.
My phone are really hot, sometimes the screen, battery and the enclosure are really hot, many more than other phones charging.
I already bought a new battery and checked with a multimeter the voltage of the old and the new battery.
So... i'm stuck... i really don't know how to solve this problem... I don't access to a official maintenance center at my country (Brazil), and the parts for this phone are almost impossible to get here (from official ways)...
So. Anyone knows how to solve this ? or passed by the same problem ?
Thanks

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