yashsingh1/xdaforums huggingface dataset:
[Touch Pro, Fuze ROM Development] abid885:
Mirror

the link is being taken out. any mirror?
[OnePlus 8T Questions & Answers] coomac:
The mic input on these usb headphones is very low with my oneplus 8t, to the point that it's practically inaudible. It works fine on my laptop. I'm curious if anyone has a usb headphone that has a decent mic input volume on this phone or any suggestions to increase the mic volume.
[LG V20 Questions & Answers] ROMSG:
I have a VS995 and this replacement battery. I'm getting less than 2 hours of SOT with both Lineage 18.1 offical and the new project lighthouse ROM at less than 50% brightness. I have greenify and ACC installed with magisk as well as no gapps. Any idea how to fix the drain?View attachment 5327661
[LG V20 Questions & Answers] Descent2:
Hello ROMSG,

Can you confirm the battery is drained vs being read as drained? You could try measuring the voltage on battery contacts before and after to confirm.

Or, since this would not hurt, without even confirming, for fun, try and clean out your USB port and the C end of the USB cable with strong alcohol, and then compressed air. Dry for sure - leave it in the sun for a while laying on or right next to some table salt.

Why:

I just finished analyzing a thread with unrelated issue, but there, it seems to me that bad USB port was causing get this: low reading from otherwise good battery (or actually create a drain - dark current on the USB connector itself). No idea why, but must be connected somehow.

I had re-soldered USB port twice in the past and once the power switch on my own devices, so it would not surprise me at all that those internal components would fail. And I am kind of super precise in how insert the cable, just time, I guess.
[LG V20 Questions & Answers] Descent2:
Funny how things work. Today I received a phone I bought from eBay for $50, because it was "Google FRP Locked". Mint black H918, no water damage. I thought I'd use the LGUP to re-load the software and may-be make it work, or something, you know, for practice learning about this stuff.

Well, it would not boot past the T-Mobile screen. Finally I made it boot to Factory Reset screen, pressed YES and it went black. No more boot, as it reported the battery (which was about 70% full before this) is now at 0%.

From 70% to 0% in a few unsuccessful boot attempts? Wow, that's really something. It did not get hot.. So, where all that energy went? I mean how did it dissipate 11.9 x 0.7 = 8.33 Wh ? It took about 15 minutes if that, so it was dissipating at 4 x 8.33 = 33.32 Wh speed without even getting hot? That's insane.

Anyway, the USB connector looks horrid, and the charge percentage is going ON and OFF when in the USB cable is in it. The USB cable feels loose in the port.

I tried cleaning but it is too far gone. I am going to replace the USB connector with a new one.

But do you see, again, the same link between discharging the battery / bad USB port and boot-loops? If true, this means that there might be a sea of perfectly good phones on eBay, just with bad USB connectors, boot-looping and eating batteries. Re-solder the USB port and you're good to go!

I would be excited to find out what was your result.
[LG V20 Questions & Answers] ROMSG:
Lg up typically causes battery drain but not like what you described. Also reflashing wont fix frp in all cases, since the versions of android on these devices is so old frp bypasses are typically a better route. I know from expierence.
[LG V20 Questions & Answers] Descent2:
LGUP does that? How weird, why? This one is also a bug, most likely.

Thank you for the tips! I had no idea. I just wanted to try different things and see what works. Typically, I'd drop my phone like in a carwash and crack the screen. So, now that I am a little smarter, I try to buy many hardware backup pieces before I need them. So this is essentially an extra screen. But since it works, why not brick it, right? Learn something along the way.

Nevertheless, I need all the hints I can get. Not a pro here by any means. Do you know of any FRP bypass method you thin works good on H918?

Since you're not new to this, would you mind if I start a conversation with you? I need answers to a couple of questions that seem to be omitted everywhere or I can't find where they are discussed.

Also can't wait to find out if you have found the USB port to be the cause of your power drain or if you found it not to be related.
[LG V20 Questions & Answers] ROMSG:
What version of android is your h918 on? I'm happy to answer any questions you have.
[LG V20 Questions & Answers] xdanubi:
Hi Guys,

Mine was F800L, and it seems like it have the same problem, bad connector. Even though I unplug the battery, when I plug the charger, it's drain 0.3-0.7 Amps, and it's get hot without turning on.

I am a little scary to desolder the usb port.
[LG V20 Questions & Answers] Descent2:
Yes xdanubi, replacing the USB port is a tricky deal. I have replaced few USB ports before, and this time I had only two jobs: replace a power switch on one phone and the USB port on H918. I did the power switch soldering job without issues, and I ruined the H918 in my attempt to replace the USB port.

What went wrong:

-My work setup was too low magnification for the H918 job. I should have upgraded to a higher magnification first, but instead I pushed ahead hoping that my sharp eyesight will haul me out as usual.

-I used ChipQuick Low Melt solder paste to mix in with the original solder in order to drop the temperature when removing the port. This was a mistake. The paste produced several independently moving micro solder balls and they run around uninhibited and I did not notice that until too late when I was examining the empty board using high magnification hand held loupe after removing the port. I should have used a Low Temp solder in a metallic form at this stage. That would not create the solder balls. Why didn't I use the metallic low temp solder? I had it at hand! Because the magnification was too low for this job and I did not feel comfortable enough to precisely apply the metallic form. Applying the paste from a syringe is easier when the work area observation is limited.

-I have not washed the board in alcohol prior to starting the job. What this did is even though I have applied the MG Pink Peelable Solder Mask jelly to the area next to repair zone to seal and protect all of the surrounding components, the flux from the solder paste still lifted the peelable mask and allowed the metal balls to run under it to get stuck to some of the smallest components. I should have thoroughly wash/brush the repair area with 97% alcohol and dry before applying the Peelable Solder Mask to have it adhere better.

All in all, I was too confident I can do it because I have done that several times in the past. Things got a lot smaller since then. This USB port on V20 is surrounded by a number of smallest components I have ever seen in SMD, and one needs to have his tools and procedures just right to get thru this. My second H918 is now what i purchased it for - just a bunch of parts.

This doesn't mean you should not try to get it done. Just be aware of particular difficulties, and get your tools, and understand every step of your procedure as you design it and know exactly why you are taking it. Also, some people always seem to get it done just on pure luck, you may just be one of them. I think if you heed my warnings and account for what I did wrong, watch few good videos and practice a little on some dead boards, you'll be all right.
[LG V20 Questions & Answers] Descent2:
Here are my measurements of power consumption from a working H918 for a comparison:

Battery removed.

Phone is connected to USB charger

Mini screen has a light gray backlight and is clearly separate from the main screen which remains black.

A battery symbol with flashing red question mark is displayed on the main screen

Phone OFF and does not start when I use the power button.

Temperature does nor rise, phone stays cold.

Current: 0.25 - 0.27 A

79% Battery is installed and charged to 85%

Phone is connected to USB charger

Both screens are black.

A battery symbol is displayed on main screen with percentage of charge and green fill.

Phone OFF but will start when I use the power button.

Temperature does nor rise, phone stays cold.

Current: 0.48 -> -> 0.37 A

85% Battery is installed and continuously charged

Phone is connected to USB charger

Both screens are black (power button press is needed to display battery charging percentage)

Phone is OFF

Temperature on power button is 30 C

Phone was OFF but is now started using the power button. Booting.

Both screens are ON

Temperature on power button is 32 C

Current: 0.60 A

Phone is ON and is in Airplane mode.

Both screen are ON

Temperature on power button is 31 C

Current: 0.47 A (Battery is now at 89%)

Hope this helps
[LG V20 Questions & Answers] Descent2:
I think your current measurements are OK. But your temperature is not OK. Try to see where the heat is coming from? IS it coming from, the CPU (felt on power button) or the USB port? In your case it would not be the battery since it is removed. It should not be the CPU either since the phone hasn't been started. I am not all that clear still on what exactly in the USB area creates the heat. It would be awesome if you could produce an InfraRed picture of the phone with the back cover off while being hot while still OFF without battery and on charger. If you have an access to the IR camera like FLIR. It may not necessarily be the port itself or it's connections. It could be one of those small SMD components next to the port that gone bad, and if that is true, replacing only the port won't help.
[LG V20 Questions & Answers] xdanubi:
Thanks for the reference. Clearly, mine has hardware problems, because even after doing factory reset, the problems persist. Tried to flash the stock pie kdz, still the same result. Without battery, the current drraw arround 0.6A, with battery plugged the phone off around 1.3A, and with phone on can be as high as 1,9A.

One thing that I am still doubt about the problem though, that the usb port still functioning, both for charging and data transfer. But the strange part, when the phone is off, whenever I plugged the usb, the phone boot up, both on PC usb or charger only.

The other strange part was that when the phone got realy hot (I measure 54 with IR gun, and around 60 reading the /sys/class/thermal/thermal_zonexx/temp file, the lower part around usb port keep cool, it is the upper part that get hot.
[LG V20 Questions & Answers] xdanubi:
I have a bad eyesight and only have a cheap magnifying glass, so maybe not now. Might as well buy another v20, because the cheapest trinocular still more expensive than that phone.
[LG V20 Questions & Answers] xdanubi:
Sadly though, I don't have access to any IR cam. I do indeed try cheaper method "ouweee" test like Rossmann did, first using bare finger, then using a some drop of IPA and see where the particular component that dried up first.

As far as I can tell, the below area near charging port were fine. nothing dried up fast in the small component area near simcard, and the small component area under the fingerprint sensor. The one that heated up fast was the most left area covered with shield.

So I don't know weather it's still usb port problems or other hardware problem.
[LG V20 Questions & Answers] Descent2:
Frame Thermal Interface Touch Point:

View attachment 5379107

Peeling Off the Copper Foil:

View attachment 5379109

Copper Foil is Removed - Roof of the Memory Exposed :

View attachment 5379111
[LG V20 Questions & Answers] Descent2:
Absolutely. The 20x binocular from AmScope on ebay is around $190. Since Iam only an amateur, I am considering building a DIY usb webcam based microscope like the one EEV blog had reviewed or better. Reading about optics now, - I am an absolute newbie to optics design.

Amazon has this phone "new" for $70 with varying reviews. Might just try that, since on e-bay or Swappa you'd likely get a phone someone from XDA already "worked with" for a while.
[LG V20 Questions & Answers] Descent2:
I too am baffled with why some phones do turn on spontaneously when charger is connected. From my experience with PCs, this usually indicates:

-- bad BIOS battery

(is there a BIOS battery cell on a phone? Yes, I know there was one on Galaxy, maybe there is one on V20 as well?) This would not generate any heat though.

-- bad corrupted BIOS

(we are on XDA, lol. Should we really try throwing this stone?) But really, maybe a full reflashing should help? I mean a complete, like a full KDZ, not just wiping of data partition which is what a factory reset really is. BUT YOU ALREADY TRIED THIS

-- some dried out capacitors around power on circuits (this one can create heat)

Again, FLIR is needed for this. Or careful thermal probing of SMD components with board being fully connected while outside of the case and plastic housing. Once a hot one is found this could be examined further.

Some research directions here...
[LG V20 Questions & Answers] Descent2:
Could you show which area was heating up:

View attachment 5379123
[LG V20 Questions & Answers] Descent2:
You clearly have about 0.3 A to 0.6 A dark current. Something is consuming this energy and dissipating it into heat. When capacitors are shot they now represent a short on the circuit where there not supposed to be one. Such short will now create this dark current.

Capacitors fail due to old age, high heat (vicious circle), and bad power supplies that deliver spikes and poorly filtered power. Big electrolytic capacitors dry out, explode, leak, but SMD capacitors fail too - they crack and melt.

https://www.youtube.com/watch?v=IciwMsWX_Y4

There could be other failed components, it's just that capacitors are ubiquitous in this regard.
[LG V20 Questions & Answers] xdanubi:
I do remove the board, to see if there's any clear evidence of burned/short capacitors. And indeed I do have the urge to remove that pinky gummy blob, and ad some PC's cpu paste to it. But the fact that I still feel a good heat to the screen area directly below it, it means that it's still have some good heat conductivity, so I'll leave that to deal with it later.

that's one hell of BGA rework.

Thank you, I'll do it later after clearing some other problems.
[LG V20 Questions & Answers] xdanubi:
Don't worry, I'd use soldering silicon mat that have tiny rectangles area to store the screw. I am to scared to grouping the screw by it's size, so I just separating the screw, and put back where it belong.
[LG V20 Questions & Answers] xdanubi:
That's interesting. I am subscribed to his channel, but it seems that I am away from youtube in last couple of months. I am gonna search that microscope alternative.

I do plan to buy some of single, cmount type lens, coupled with cmount based camera. It's cheaper than bino/trinocular out there. i do have some crappy cheap usb microscope that do indeed magnify something, but doesn't have enough distance to work with, so I am stick with magnifying glass for now.
[LG V20 Questions & Answers] Descent2:
Whatever method works, of course. I have exactly same mat, and place screws on the left edge into numbered compartments. However, if I take a while to mess with something, sometimes I'll touch the screws in cells with the bottom of my arm and they stick to it.Then they fall off in the middle of the mat (lucky me) totally surprising me, lol.
[LG V20 Questions & Answers] Descent2:
It is nice that so many people on XDA are totally the type of folks I'd be proud to have as friends. I too watch Louis Rossmann of course. Btw, funny, recently watched Louis Rossmann video and noticed that his YouTube feed looks so much as mine that I'd have a hard time telling which is which!

The EEV Blog video I was talking about is this one:

https://www.youtube.com/watch?v=HIWUFFlr2I4

I have just received the MS cam from eBay for about $20. Just need to get that lens

https://www.diyinhk.com/shop/usb-microscope-1080p-for-smt-soldering/51-lifecam-studio-1080p-microscope-lens-mod-kit.html

or replace it with something on my own.

I am sorry for the chaotic nature of my posts. The main issue that you have is the dark current, like you said. You are right in that the fact that you can feel that extra consumption in the heat dissipation is better than if you didn't, - you'd have the chips cooked. So, all the other things are just areas to improve on, but finding the exact component responsible for your higher than normal current consumption is the key.
[LG V20 Questions & Answers] xdanubi:
I tested on the other side., because at first I thought there's some bad capacitors.

This one right there heat up pretty fast, even though the screen unplugged

View attachment 5379219
[LG V20 Questions & Answers] xdanubi:
I am happy too, having a total stranger, responds to my problems, and patiently explaining something new and valuable knowledge to me. I am very appreciate that.

By the way, what is your yt channe? if you don't mind sharing it here.

I think I'll pass on this one. That one locked set of zoom is really tuning point.

No need to be sorry, my post just as chaotic as yours, even worst, my grammar is not that good to begin with.

The phone can dissipate that heat without cooking anything, yet. It can stay on a whole day, pluged to the charger of course, without any smoke coming out of it. While it definitely doesn't comfortable enough to hold on, because of the heat, but the main problem having it as a phone was the blazing fast battery drain. Having 0.6A of dark current, the phone just lasted an hour or less with the battery plugged. So currently I have it stanby with battery removed, on only turn it on when I need it. The unfortunate part was that I have two finance app that lock to that phone.
[LG V20 Questions & Answers] xdanubi:
I begin to suspect other things too, even the software part was suspicious.

Do you have any reference of how much cpu usage stock standar V20 on pie? Mine was pretty suspicious, and the strange part, this is happen even after flashing kdz file.

View attachment 5379227

Is this look suspicious to you? having a quadcore cpu that have almost 8 cpu load on all 5,10,15 min average. The phone was turn on and stanby for 13 hours. I don't have any "heavy" apps on it. I even de-google it, remove the known hogging apps like facebook, instagram, and any other preinstalled. The phone still un-rooted.

Do you have any other unrooted apps that I could try to analyze this strange cpu load? I randomly try "Simple System Monitor" and this is what show up.

View attachment 5379229

View attachment 5379231

View attachment 5379233View attachment 5379235View attachment 5379237View attachment 5379239

I just have one V20, so I don't have anything to compare.

On my other android that have octa core cpu(galaxy tab s2), and much more apps on it, the cpu load was llike two point something on stanby.
[LG V20 Questions & Answers] Descent2:
I do not have a YT channel for this topic.. I am sorry for misunderstanding, I meant that his "feed" is the same as mine. Meaning that his interests are exactly matching and I recognize like almost every video. I have a channel but it is about birds and quite ridiculously stupid one, so, same as I don't have any, lol.

The shield that you have circled covers the "power supply" of the phone. Under that shield is the PM8996 chip which controls the power. It basically looks like this:

View attachment 5379333

This is a samsung board, but the chip is the same. It is marked U7003 yellow. You can see where the shield was soldered - I marked those spots with small green left leaning slashes. Around that PM8996 integrated circuit you can see smaller parts. The ones with smoother lighter coloring are usually the capacitors (I marked few of them with a pink dot). One of them is probably cracked and shorted. Also note how there is a wire inside the board (marked by orange line) that connects the power button to the power supply. This is the connection that explains why your phone likes to start by itself when you provide any kind of power. I think that the capacitor that is shorted somehow makes it so that the voltage gets to the pin of 8994 which normally is the "boot the phone" signal.
[LG V20 Questions & Answers] Descent2:
I totally agree with you that your screenshots show that things are not right. However, unfortunately, we know that your phone is misbehaving even while it is OFF (draws current, heating up, boots up). This is very important as it means there is a hardware issue.

Now, the software will do something crazy easily for several reasons, bad hardware being one of them. It is no wonder the phone software behaves like this if it has issues with power. I would not focus on that till the hardware issue is solved, because there is no point. To troubleshoot software, the hardware must be running fine as a pre-requisite. And you are way ahead of me in knowing which apps to use, anyway.

Now, to lift the shield and hunt for bad part, and possibly replace the entire PM8996 chip is going to cost you dearly, I think no less than a 100 dollars, just because of time and labor of a guy who is capable of replacing the chip. Add shipping if you don't have a shop nearby. Obviously, you'd be better off getting a replacement phone. Maybe a master in a lower wage country? Depending on where you are. Here in USA, this makes no sense, because the repair would be more than a replacement device. Check how much Louis Rossmann charges for this?

Make sure you have the backup now because this power issue might get escalated all of a sudden if another part fails due to thermal situation. I think if another component fails the phone will no longer boot.

I am sorry to say, my friend, but after we dug this deep, this situation looks bad. I no longer think your USB port has anything to do with this. Nor thermal compound on CPU, nor any software issues. Everything points to things under that shield (confirmed by the uncontrolled boot on power connection).

Or I am not thinking straight. If something else comes to mind I'll post it here.
[LG V20 Questions & Answers] xdanubi:
That's very make sense, a bad pmic, or anything around it. I am okay with cracking / lifting those shield up. In fact, I am in the position of nothing to loose, because the phone pretty useless at this point. It is boot up, I can use it, but the battery only last one hour, plus the excessive heat. The finance app that tied to this phone, I can go to the bank next week to pair it to other device. It is annoying, but doable. Anything else was already move to other device.

If the bad part was only some caps, then I am lucky. If it was the ic, then I'll rest the device until I have enough tools and skill to do the rework. Sending it to repair make no economical sense at this point. I got this phone for 1 M idr (around 70 usd), and I am not sure I can find local repair shop that do board level repair. Might as well to just add it to my "bad phone" collection. This is the first LG :D.

Thank you very much for accompany me this far.
[LG V20 Questions & Answers] Descent2:
If you want to go there then you'd need the hot air station to de-solder the shield, unless you are pretty deadly with your iron. Will have to wait till you get a new magnification setup, cause it's all super small under that shield. I would like to know what microscope you ended up building and how well it performs. It will probably make sense then to test most of the components that are available just in case the heating up part is not right next to the failed part. I've seen YT videos on checking the SMD components and some of those guys don't even replace the bad capacitor once found, they just break it off and thus remove the short, and give the device back to client. Of course, since the capacitor was there to tune some circuit or filter some current or signal, the device would still work, but possibly not as good.

It was my pleasure. Good luck