Develop Bugs

USB Port broken - Stuck in boot screen

Here we go:
When I recharged my HTC in my car, I got in a little accident and the HTC flew around the car a little bit.
Long story short; the USB/Charge port broke and I got it fixed by a friend.
Took him a few days because it was totally messed up, but hey, I could recharge it.
He said he couldn't fix the USB connection, but no problem: I still had bluetooth.
However, yesterday I got really stupid...
I tried to flash the rom using my bluetooth connection.
All went fine, but ofcourse, when rebooting it got stuck.
Tried the soft reset, tried the hard reset, but no luck.
Of course I also tried all available tools (mtty) but damn, stupid me again, that won't work since the USB connection won't work; my PC doesn't even detect that there is a device connected.
So here's my question:
Is there a way to get the HTC out of bootloader menu without the use of the USB port?
As I am afraid there isn't a way, does anyone have a layout/schematic of the HTC Universal hardware layout so I can try to fix the USB connection myself?
The friend that fixed it last time moved, so I'll have to try it myself .

here is a link to the HTC Universal service manual, maybe you can find some help there.

leffetripel said:
here is a link to the HTC Universal service manual, maybe you can find some help there.
Click to expand...
Click to collapse
Couldn't find the USB-connector anywhere in the service manual...
Yeah okay, it showed the port itself, but not where it's connected on the motherboard.
Anyone really technical who can point it out?
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martinbl said:
Couldn't find the USB-connector anywhere in the service manual...
Yeah okay, it showed the port itself, but not where it's connected on the motherboard.
Anyone really technical who can point it out?
http://xs227.xs.to/xs227/08201/usb309.jpg
Click to expand...
Click to collapse
No one? :'(

i have a working motherboard, that i can sell. If you cant fix the usb connector. pm me if interested

So here's my question:
Is there a way to get the HTC out of bootloader menu without the use of the USB port?
As I am afraid there isn't a way, does anyone have a layout/schematic of the HTC Universal hardware layout so I can try to fix the USB connection myself?
The friend that fixed it last time moved, so I'll have to try it myself .[/quote]
There is one way to flash it from the SD card, look in the forum or in WIKI for more information. Here you can find picture ( as well broken mini USB) http://forum.xda-developers.com/showthread.php?t=381560

Bulldog said:
There is one way to flash it from the SD card, look in the forum or in WIKI for more information.
Click to expand...
Click to collapse
I can't find it anywhere?
Only SD flashing for other models... Or am I just ain't looking right?

martinbl said:
I can't find it anywhere?
Only SD flashing for other models... Or am I just ain't looking right?
Click to expand...
Click to collapse
This one may can help you
http://forum.xda-developers.com/showthread.php?t=393370

My USB port broken also.
My USB port pulled out also. I did find my connector, even though I purchased a replacement USB off eBay. My eyes are not good enough to resolder, and am not sure what is on the other side of board that may be effected should I try. I just downloaded the PDF file ya'all listed, so now I will check it out in depth. I would prefer having a professional fix this, but here in Memphis Tn USA I have had better luck finding polar bears. I recently got this unit so I know nothing! I do realize that it probably needs to be upgraded from WM5 to WM6. I have also noticed that replacement mother boards are available also on eBay. I just purchased an used JasJar with good mother board but broken screen thinking about using it for parts to fix mine.
Hugh (toolmanfedex)

Hey
My USB port broke off, and I lost it... I dropped the phone out of my motorcycle tankbag (since it opens on the "bottom" end) the impact was severe enough that the case fell appart and speakers popped out, all the wires intact, I put it back together but the port is lost... it still works of course but my battery ran out, can't charge it without the usb port.
Anyway, I see it's delicate but not that delicate, i want to solder a new one on myself what I have to do is find one and here is my question:
Which type/sort of ports work, do I need an htc-universal specific one or is it standard and just any of the correct size where contacts overlap, is good enough?
If the answer is standard I'll get'em at the nearest electronic store, if not, where to get'em? used off ebay or some useful links any of you may have handy?
Thanks in advance,
ciao

JasJar Replacement USB Connector
This is where I got a replacement USB port for my JasJar: eBay
http://stores.ebay.com/Wincom-International
HTC Wizard IMATE JASJAR 838 D900 charge port connector
eBay Item number: 310010162549
Price: US $4.99 Shipping to USA: $5.99
Hugh

The connector you want is a "USB-to-go" or a "USB Mini-AB" SMT Scoket any good electronics component retailer should have them. The big question is have you damaged the pads on the motherboard?

oi, thanks mates, I checked that retailer out, found a local retailer with these components, if it's a standard one, it should work, I'll try to see if it works before soldering (using some duct tape or something I guess).
I'm pretty sure I haven't damaged the pads on the motherboard, the thing just "gently" broke off (as gentle as you can imagine a break can be). How would damage look like? They look intact really... and it's a big enough patch that I feel confident soldering on.
I ordered one of these connectors and should be here tomorrow. Thanks again for info.
---
well apparently not... only A or B in stock, but not the -AB in all the local retailers, guess I'll grab it from the ebay one Thanks for that info too again.

Now then, several months later, my usb socket broke off again.
I really lost trust in my universal, it feels just... touchy, like it's a human baby, that's how I act when I carry it around and don't like it. Since I don't want my mobile device to be such a "burden" really I'm thinking about replacing it.
I'm not an elec-technician, in fact I've soldered a few things in my life, but this one, I somehow did, I didn't have fine enough tools so some of the contacts got spilled and interconnected and I peeled off the links with a boxcutter knife later. It was a few-hour endeavour. Yeah crude and barbaric but in the end, I managed that without damaging the motherboard. It worked, active syncinc, everything, but I felt it wasn't really stable. Since I don't have an external battery charger, my uni is sadly out of order now.
I have a question:
How to solder this thing back on properly?
And when done so, how sturdy is it? Sturdy enough?
Thanks, regards

The USB connector is a pain to solder as you need a big tip to solder to the big pads that hold it in place and a small tip to solder the actual USB data pins. If it is done correctly it can out last the Uni. I can repair it for you if you like, it wont be the first and I'm sure it wont be the last. PM me if you are intrested.

DONT try to resoldere it urself, u need skill and especially a proper LOW WATT soldering tool!! its also easy tofuck it up, permanently.
i'm not sure if u can find electronic guys willing to do this ( cause its a small job for them), but ur best bet would be to visit the local guy who does PS2/XBOX/GAMECUBE modchip iinstalls...he'll solder ur usb port in 2 minutes.

Just to let you know I've been a electroinc engineer for 15+ years this sort of thing is my bread and butter. If you want to see the standard I work too check out the 128Mb Upgrade page thats my work and the kind of equipment I have.
But I agree with Starik do try it yourself unless your are skilled at soldering and have the right tools.

GNex will not charge but thinks it is.

Ive been having this issue with my GNex since I got it. I believe the previous owner had the same issue which is why I got a great deal.
When plug the phone in it will show a lightning bolt through the icon in the corner and the lock screen says that it is charging. When I go to the battery screen, however, it always says "not charging". Most importantly, the phone doesn't charge.
It will connect to the computer via usb cable.
When I first got it I found the micro-usb jack was all mangled, pins were all bent. I assumed this was the problem and I replaced the jack with a new one. The problem did not go away. Not only that but I built a cradle charger that uses the pogo pins and that ALSO doesn't work. I do not believe it is software related because this problem has persisted over major updates. Its running stock 4.2
Has anyone seen this problem before???
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Same story for me
I do. Same story for me. Bought it used, Opened up, fully charged, used it, loved it. Two days and i put it to charge overnight. Next morning, phone is powered off. But connected, and it says its charging. I have the exact same issue. Changed the USB charging module ( thought about making a POGO cradle) , bought new batterys ( even a hyperion 3800) , wall charger for the batterys.
Issue is not gone. Im using the phone at the moment with a PowerPack 2200mah . So it thinks it is connected to sumthin and not using the battery. Anoying but it lets me use my phone. Sometimes it charges to 20-30% , 60% once . But the issue is there. I've read a lot and i think is not the charging module itself but the MAX17040 fuel gauge chip that reads the SoC on the batterys.
Anyone else?

My old roommate had this problem and sent hers in for a replacement.

Adler87 said:
When I first got it I found the micro-usb jack was all mangled, pins were all bent. I assumed this was the problem and I replaced the jack with a new one. The problem did not go away.
Click to expand...
Click to collapse
Sorry, you replaced the jack of the wall charger or the microusb module inside the gnex? If i understood correctly and the wall charger had a jack with bent pins, that means that almost certainly either the bent pins damaged the microusb module of the gnex or the damage to the pins was maybe caused while charger was connected to the phone. The fact that the phone still connects to the charger still doesn't mean there is no damage, it could be just a pin, the "wrong" pin, to be damaged.
Replacing the microusb module is not something too difficult with the gnex and it's not too expensive either. You could think about looking for a spare part online and replace it.

Wortdurst said:
Sorry, you replaced the jack of the wall charger or the microusb module inside the gnex? If i understood correctly and the wall charger had a jack with bent pins, that means that almost certainly either the bent pins damaged the microusb module of the gnex or the damage to the pins was maybe caused while charger was connected to the phone. The fact that the phone still connects to the charger still doesn't mean there is no damage, it could be just a pin, the "wrong" pin, to be damaged.
Replacing the microusb module is not something too difficult with the gnex and it's not too expensive either. You could think about looking for a spare part online and replace it.
Click to expand...
Click to collapse
Sorry I wasn't clear. I replaced the microusb module inside the phone.
My current strategy is to use an external battery charger and two batteries.

I think this is software related. It just happened to my Nexus 4 today. I rebooted it and it fixed itself.

c0LdFire said:
I think this is software related. It just happened to my Nexus 4 today. I rebooted it and it fixed itself.
Click to expand...
Click to collapse
Pretty sure its not software related. I had this problem in 4.1 and now I have it in 4.2. Unless there is some more basic software that is not updated with the OS.

There's a few threads like this floating around (including one i made. you may have already looked through them but i'll post the links)
http://forum.xda-developers.com/showthread.php?t=1794231
http://forum.xda-developers.com/showthread.php?t=2080383
http://forum.xda-developers.com/showthread.php?t=2059289
Anyways my issue like this started soon after i flashed my first 4.2 rom. flashing to any other rom (4.1, stock, anything), nor changing chargers, cables, or batteries helped. I eventually gave up and went to the verizon store where i briefly explained to the lady "it only charges to a certain level no matter the battery" and she said alright no problem and had my a like new replacement 2 days later.
in one of the above threads someone tried replacing the microusb board and it resulted in no change.
hopefully this gets sorted out soon.

crowmallet said:
There's a few threads like this floating around (including one i made. you may have already looked through them but i'll post the links)
http://forum.xda-developers.com/showthread.php?t=1794231
http://forum.xda-developers.com/showthread.php?t=2080383
http://forum.xda-developers.com/showthread.php?t=2059289
Anyways my issue like this started soon after i flashed my first 4.2 rom. flashing to any other rom (4.1, stock, anything), nor changing chargers, cables, or batteries helped. I eventually gave up and went to the verizon store where i briefly explained to the lady "it only charges to a certain level no matter the battery" and she said alright no problem and had my a like new replacement 2 days later.
in one of the above threads someone tried replacing the microusb board and it resulted in no change.
hopefully this gets sorted out soon.
Click to expand...
Click to collapse
I've seen one or two of those and many others but they are all somewhat different than my issue. My phone doesn't seem to charge at all. It doesn't start and stop prematurely, it just thinks it's starting but I have yet to see the charge go up while its plugged in.

[Q] USB IO PCB Touchscreen calibration for Nexus 7 2013

I replaced my USB PCB IO (due to physical damage) with this : ME571KL SUB_BD./AS(WUS). I can't provide the URL because this is my first time posting, but a quick google should lead you to a link from asusparts.eu
With this new PCB, everything except for the touchscreen is operational. I know the fault is not with the digitizer since if I connect my damaged old USB PCB IO, the touchscreen works. The website mentions thus : " Please note that this part may have to be calibrated to work with your unit. To do this you will have to send your tablet to an Asus service center for calibration"
However, Asus has been very cooperative so far and I was wondering whether you would be able to provide a solution to this issue.
Thank you !

Going to replace the USB board and worried by this.
My Nexus 7 2013 has recently stopped to charge...
Tried to tighten the USB socket but that didn't help. I suppose the USB socket is dead; as I don't know how to solder, I think I'm going to have to replace the whole sub-board... but I came upon the same warning that the board needs to be calibrated and saw this thread, so I was wondering if someone knew if there's any issue with replacing it?

After looking at it closer, I found out one of the pins is broken and gone... The 4 other pins are all okay at the moment.
Off-topic, but does someone have an idea to bridge the gap between the USB socket and the board?

Soldering?
Would applying some solder to all the pins help?

leoetlino said:
Would applying some solder to all the pins help?
Click to expand...
Click to collapse
You didn't mention where the socket pin broke off. If it's between the back pin and the board itself, then it's just a matter of dropping some solder to bridge what's left on the pin itself and the pad, or copper trace, on the board. There's no secret: you need to reestablish continuity between those two points. But since it's so tiny, you need to check for continuity with a volt meter.
How the pin broke though, is hard to understand. That's the area nothing in the operation of the tab ever touches. There are no moving parts. How did it happen?

It seems to be between the back of the connector and the board:
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A few months ago, I started having charging issues. It would charge intermittently, and after some weeks the whole port stopped working...
That's why I opened it, and to no surprise, I could see the USB connector had something wrong: as you can see, the whole GND pin has got off the board. I presume it wasn't soldered properly.
If I use a needle to manually connect the connector and the "pad", then it works fine: charging, USB data, HDMI SlimPort...
In this case, would applying some solder help?

leoetlino said:
A few months ago, I started having charging issues. It would charge intermittently, and after some weeks the whole port stopped working...
That's why I opened it, and to no surprise, I could see the USB connector had something wrong: as you can see, the whole GND pin has got off the board. I presume it wasn't soldered properly.
If I use a needle to manually connect the connector and the "pad", then it works fine: charging, USB data, HDMI SlimPort...
In this case, would applying some solder help?
Click to expand...
Click to collapse
If you can drop some solder to link pin 1 of the usb socket to trace "1" on the pad, it should work. But make sure it doesn't short with pin 2. If it's too difficult, try a fine copper strand. That pin is not GND, it's 5v.

Thanks for your reply. I stand corrected.
Just a question, would there be issues if the solder also touches the other pins? Would that create a short circuit?
Hopefully I won't need to solder anything but simply apply some solder...

leoetlino said:
Thanks for your reply. I stand corrected.
Just a question, would there be issues if the solder also touches the other pins? Would that create a short circuit?
Hopefully I won't need to solder anything but simply apply some solder...
Click to expand...
Click to collapse
You don't want anything shorted, as it might fry the components. That happens, and it's the end of it. Use some gel flux, and a soldering that's no bigger than 0.8mm. At most a 1.0 mm tip. Don't try your luck with a regular 25W iron, you will fail, and end up destroying the socket. I learned it the hard way so you don't have to..

Why is this not compatible ? they do not say anything about this issue when this item is purchased.
why is this not a 'plug and play' type of replacement part ?
I have been repairing computers for 16 years and all parts that I have purchased and replaced do not need to be returned to the manufacturer for 'Calibration'. updated drivers are readily available for new parts from other vendors, So....
What does this say about Asus ?
Why do they sell replacement parts that they know will not work without their 'special attention/calibration/tool ?
I have purchased this part with the expectation that it will/should work without all this palaver.
I have asked them (ASUS) to take this matter further with their manufacturing unit and for them to 'fix' this issue and supply the already growing market for these parts with the required 'fix' ASAP.....but I'm not holding my breath.
I think this is a disgusting situation for users/pc repairers to be put into knowing that it is easier to buy a new unit than to repair the old one.
Disgruntled pc repairer
K.P.

Lenovo Vibe Shot Z90-7 Charging Problem

Hello,
I would like some insight on a problem that I am having with a Lenovo Vibe Shot Z90.
I just bought the phone two months ago during a trip I took to Singapore. It worked fine for about a month before the problem started. The phone never fell down, into water, overheated or anything like that. The problem started suddenly, without an apparent reason. Alas, the local Lenovo branch refused to honor the warranty, claiming that they only take in "EU models".
The problem is that the phone will not charge while it is turned on. It does not even "see" the USB cable getting plugged in. If I turn it off however, it charges just fine, all the way up to 100%. I also noticed that the battery drains faster, for no apparent reason, without any apps running. It most definitely is not a software problem, I did a hard reset at first, it did not work and then, just to be sure, I even flashed the latest official ROM using QFIL.
Do you reckon there is any possibility that the problem is caused by the battery, or is it definitely mainboard-related? If there is any chance that replacing the battery will solve the problem, I could order one online and I am competent enough to replace it myself, but I do not want to get into an ordeal if there is not even a remote chance that it would fix the problem.
Any suggestions welcome.
Thank you in advance.

et.e.f.gr said:
Hello,
Do you reckon there is any possibility that the problem is caused by the battery, or is it definitely mainboard-related? If there is any chance that replacing the battery will solve the problem, I could order one online and I am competent enough to replace it myself, but I do not want to get into an ordeal if there is not even a remote chance that it would fix the problem.
Any suggestions welcome.
Thank you in advance.
Click to expand...
Click to collapse
Have you tried using a more powerful charger?

Hovatek said:
Have you tried using a more powerful charger?
Click to expand...
Click to collapse
Yes. A bad charger was the first thing that I considered, so I tried another 2 A charger and then even tried it with a 50 A desktop PSU. It made no difference. There is no current flowing from the charger (PSU) to the phone at all once it is on. When I turn it off, it draws about 1.25 A, which is pretty normal.

et.e.f.gr said:
Yes. A bad charger was the first thing that I considered, so I tried another 2 A charger and then even tried it with a 50 A desktop PSU. It made no difference. There is no current flowing from the charger (PSU) to the phone at all once it is on. When I turn it off, it draws about 1.25 A, which is pretty normal.
Click to expand...
Click to collapse
You have to read about "USB PowerDelivery".
Alone PSU current efficiency has no effect on USB devices charging current.
Amount of current that the end device is able to absorb, is defined on the resistors (voltage dividers) which feeds the D+ and D- lines.
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Also read the Battery Charging Specification - Revision 1.2

sunblade said:
You have to read about "USB PowerDelivery".
Alone PSU current efficiency has no effect on USB devices charging current.
Amount of current that the end device is able to absorb, is defined on the resistors (voltage dividers) which feeds the D+ and D- lines.
Also read the Battery Charging Specification - Revision 1.2
Click to expand...
Click to collapse
I am aware that the device would not ever (normally) draw more current than it is supposed to, regardless of the PSU used.
I did check some of the resistors at the time before my original post and they did seem to fall within spec. Besides, the phone would charge normally once powered down, so I doubt that it was such a simple problem as a resistor. Alas, this is an old thread and long ago I decided that the phone was not worth my time anymore, so I threw it away and thus I cannot recheck the circuit again. This will hopefully be helpful to people with similar problems in the future.

I think this is a software issue. Please tell me what version of ROM and baseband you have?
I was playing a lot with different roms, and in some cases I had the same issue. Eg when phone was chargeed from PC it was very slow.

Hi,
i've just received my lenovo vibe shot.
After a full charge, it worked perfectly.
After a second charge, still working. And the it stopped. No led when i plug it. No charge, no power.
I tried a different usb cable. Then another charger. Still nothing.
Any idea ?
Thank you.

deschampst said:
Hi,
i've just received my lenovo vibe shot.
After a full charge, it worked perfectly.
After a second charge, still working. And the it stopped. No led when i plug it. No charge, no power.
I tried a different usb cable. Then another charger. Still nothing.
Any idea ?
Thank you.
Click to expand...
Click to collapse
As far I know, MAX77819 is charging the battery.
Using multimeter measure selected (PINK) test point and read if voltage vs GND is about 1.8V

sunblade said:
As far I know, MAX77819 is charging the battery.
Using multimeter measure selected (PINK) test point and read if voltage vs GND is about 1.8V
Click to expand...
Click to collapse
Thank you for your answer.
I'm not sure I will open the phone now as it is under warranty.
I'm also not sure that i would be able to open the phone as I don't see how to open it !
It 's kind of weird that nobody else seems to have this kind of charging problem. Bad luck I guess.

Same problem
I have exactly the same problem. Phone was purchased from tinydeal. Replaced ROM with international version because not been able to run Facebook and other applications. Working perfect for 1 month. Then suddenly stoped charging. When plugged indicator shows charging but percentage charged droped.
I was not able to use warranty because I cannot send products with lithium batteries internationally using regular mail.
The phone was at two service shops. They problem is this chip which should be responsible for charging is very difficult to replace. They could not repair it. Now I have ordered a motherboard from aliexpress for 70$. When the phone broke there were no options for purchasing motherboard.

Thank you for your post.
I have now sent the phone back (i did send it with regular mail !). Still wainting for replacement.
I hope i won't have the same problem again !
Let us know if you succeded to fix the problem.

Hi.
I had the same problem after my first boot. I bought in Aliexpress. My solution was (more or less) easy.
I don't know why, powerful charger didn't work, but my old 5v-500mA worked 30 mins after connected. Once I had 10% battery I used stock charger and thats all.... very strange... Probably something wrong in battery..... who knows.... I hope this helps next time.

Samsung Note 10.1 2014 Edition (P-601) wont accept new batterys

Hey there,
greetings from germany. Pretty sure this belongs to "Questions and Answers", if not - please hit me and move it.
I am confronted with a, in my opinion, strange problem regarding my P-601 Samsung Note 10.10 2014 Edition.
I will try to provide every action I took and what I figured out so far that noone that wants to help will need his crystal ball. But the first actions are about a year ago, so forgive me if I cant remember exactly.
Device: Samsung Tablet Note 10.1 2014 Edition (P-601)
Problem: Charging slow AF but lives, can be turned on, can be loaded via USB. (But more power is drained while using than can be delivered by charging = dies sooner or later while beeing used)
OS: LineAge OS
First I thought, EASY - get a new battery, done. Wrong.
I ordered a new battery, a (2) "vhbw" battery for "T8220E" - same mentioned on the original Samsung battery.
This is a year ago, In my belief I did get the tablet to run, and charge- but had the same problems regarding the charging speed. Slow AF - but I am not sure! Life happend, things came inbetween so I did put everything aside. Now I want to use it in my home gym, so thats why I came up here.
My next suggestion was that the charge electronic maybe the problem, so I ordered a new one, built it in. Didnt change anything. The (1) Original battery, is still charging slow af.
The new battery, doesnt do anything! If the (2) "vhbw" battery is built in, I am not able to turn the tablet on OR charge it. Its just a brick with this battery.
So what did I do? I ordered a new battery, from a well known german company trading parts like this, a (3) "original samsung battery". Guess what, the tablet does nothing.
So i thought, maybe your new charging electronic is the problem. So I put the (1) Original Tablet battery in again, and well - it runs, can be turned on and can be charged (slow af).
So the charging electronic is fine. Display is also fine.
I did confirm this several times by changing the batterys in and out, the new batterys (2) and (3) are "dead", the (1) original battery runs.
Right now I am stuck. It seems that my Tablet is blocking any battery besides his original one.
Note: I cant access Recovery Mode with battery (2) and (3). Its really dead. They where also charged atleast an half an hour, just in case they were delivered "really dead at 0%", which would be new to me because most devices or batterys come with atleast 25% battery status.
Note2: Yes I did use a ****load of power adapter and cables all in combination, same result.
Any help is really appreciated! Thanks in advance.
clyde
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Hello, I came here looking for recommendations for a new battery for my SM-P600. Could you tell me where you ordered your OEM one from?
As far as your problem, do you have a multi-meter? There are very cheap basic ones if you don't. Anyway, you can test the seemingly dead batteries with it to determine if they are in fact dead, or something else is going on.
Secondly, do you happen to have a hobby charger? With these, you can charge pretty much any battery L-ion or other. You can also do a drain test with most of these to determine the capacity of a battery. That is all I can really think of thus far. Determine if the batteries are dead. Oh one more thing you could do with the multi-meter is test the current being applied to the battery. I believe there are some free apps in the Google Play Store that can also tell you the electrical current going into the battery. Perhaps by doing this you can determine if the problem is something in the tablet itself. If I think of anything else, I will let you know.
Thanks

Hey,
thanks for the feedback.
You mean battery (3)? I ordered battery (3) from ng-mobile.de
Funny that you say that with the "dead battery", because I just had the same thought 10 Minutes ago. Those batterys were manufactured years ago I guess and were just sitting cozy in their boxes, I guess they are deep discharged. (hope this vocab is correct).
I have pretty much everything that is measured "useless" in a normal household, but sadly no multi-meter (no more). If those batterys are deeply discharged, it should be possible to be reanimated with very low charging power. The lowest I should have is a USB 2.0 Port on my pc (which were it is connected right now) or a oldschool dumb power bank without any intelligence).
I will keep this updated.

solved
It worked. About an hour connected to a USB 2.0 port of my computer, and it just popped back into live. Thanks for sharing your thoughts with me!

There have been reports of the plugs of replacement batteries for these tablets not fitting properly.
Also bad solder joints at the battery connector.
And a certain behaviour i oberved myself, requiring certain custom roms or chargers in case of my P605:
In soft-off state tablet will charge at 0,5A instead of 2A max
and
When powered on it will charge at full power until the screen switches off and it enters standby. Then no charge at all.