[K@mui]

Received mine yesterday! hooray! Battery arrived after 3-4 weeks, If I'm right.
I installed it (need some ornamental changes though, and little more scratching on the back cover)The process is simple but care 3 things!

1) Remove the 2-sided tape below the old battery carefully and do not use excessive force. Use a knife and try to unglue the tape. Do not try to cut the glue (between battery and 2-side tape).

2) Be carefull with the speaker. Dettach it really careful and then use a mambrane to to keep it safe until you place it again. I wasn't carefull and red wire has been cut. Of course its easy to fix it, but why brake it from the 1st place.

3) Be careful, as always, with soldering. It's easy to solder the new battery cables (and wifi cable onmy case) but near them there are many tiny transistrors,chips etc., have a steady hand and don't damage them.

Thanks jured for the photos. Your cable placemment helped a lot.

[techno.plug]

I've years of experience in fixing electronic devices, but one can still make a stupid mistake if not careful.

I've received my battery 4 days ago, and while in the final stage of installing battery I accidentally made a cut on a corner of the battery (grey outer protection layer) with the knife. I immediately felt a smell which I can best describe as the smell of very ripe kiwi fruit. Of course, I Googled immediately, and found dozens of posts where people described as getting "sweet" smell from LiPo batteries which means vacuum protection has been compromised, and the battery is no longer safe to use, and should be disposed ASAP.

I've noticed after 2-3 hours that battery became somehow "soft" (I can bend it a little bit) which means air definitely got inside the cell. Even after 4 days I can still measure the voltage is exactly 3.92V; same as the first time I measured it after taking it out of the box. However, I'm not putting this battery inside my tablet as I'm not sure what will happen if I try to charge it. It's still standing on my table after 4 days, and I guess I can at least salvage the PCB from the battery.

Anyway, lesson learned: one can't be absolutely careful when dealing with electronics repair/upgrade. I've ordered a new battery, and again I'm impatiently waiting for it to arrive.

[razvan_seed]

could someone please help me with some hardware problem with icoo d70pro elecreonic piece burned? i need a transistor or something named hxn-xia e3229 , the piece is in the picture with a circle around.i've used my tablet for just one day ,than it just burned itself.Could someone please help me with everything about that electronic piece , can i replace with something else ?

Attached File(s)

•  ICOO_14_mod 1000.JPG (178.34K)
  Number of downloads: 25
•  ICOO_12 2000.JPG (331.3K)
  Number of downloads: 24

[Sartre]

techno.plug, on 14 March 2013 - 04:01 AM, said:

I've years of experience in fixing electronic devices, but one can still make a stupid mistake if not careful.

I've received my battery 4 days ago, and while in the final stage of installing battery I accidentally made a cut on a corner of the battery (grey outer protection layer) with the knife. I immediately felt a smell which I can best describe as the smell of very ripe kiwi fruit. Of course, I Googled immediately, and found dozens of posts where people described as getting "sweet" smell from LiPo batteries which means vacuum protection has been compromised, and the battery is no longer safe to use, and should be disposed ASAP.

I've noticed after 2-3 hours that battery became somehow "soft" (I can bend it a little bit) which means air definitely got inside the cell. Even after 4 days I can still measure the voltage is exactly 3.92V; same as the first time I measured it after taking it out of the box. However, I'm not putting this battery inside my tablet as I'm not sure what will happen if I try to charge it. It's still standing on my table after 4 days, and I guess I can at least salvage the PCB from the battery.

Anyway, lesson learned: one can't be absolutely careful when dealing with electronics repair/upgrade. I've ordered a new battery, and again I'm impatiently waiting for it to arrive.

I cut the seal on my old battery too. I couldn't find much good info on whether it was safe to use or not, except for a paper titled "Safety & Usage Procedure for Lithium Polymer Batteries, Fall 2009, Texas A&M University" saying that it would be ok to tape it up if the container structure hasn't been compromised.

Quote

Repairs may only be made to battery packs demonstrating minor damage that meets the criterion
outlined in section 2.1.2, and all repairs must be logged in accordance with section 4.1.

Damage that is limited to the pack heat-shrink wrapper and does not penetrate to any cell inside
the pack may be covered with electrical tape after inspection of the underlying cell.

[Sartre]

How do you know it burned out?

[Jack_Trekzak]

Sartre, on 05 February 2013 - 03:08 PM, said:

No, I mean the ALC563 down near the HDMI port. The WiFi chip is self-contained.

The ALC chip is probably the ALC5631 from Realtek. This is an audio chip, that's why it is very near the headphones connector.

See: http://www.realtek.c...nn=3&ProdID=159


Jack

[Sartre]

Yep, looks like that's what it is.

[many408]

jured, on 04 February 2013 - 11:22 PM, said:

http://www.slatedroi...attach_id=10530

I have also just finished replacing my battery with a 5000mAh version.

Where did you get the battery?

[jured]

Aliexpress.com, after a link from a.different forum, but I don't have the link any more. I think in this forum there is a link in one of the threads. Unfortunately posting wasn't very disciplined so these links are in the ROM dump thread, I think.

[techno.plug]

Ok, I've received the new battery 3 days ago, and I've installed it the same day. However, it seems the battery is damaged or something similar. I've charged it as soon as modification was completed and it displayed 99% battery left after few hours of charging. The first thing I noticed was the voltage @ 99% which as ~3800mV. I left it charge overnight only to find in the morning voltage hasn't changed a bit. Still showing 3800mV. I've rebooted the tablet and to my surprise battery was down to ~40% and voltage was down to 3600mV as soon as BMW started. Ok, I've unplugged and plugged the charger and let it charge.

After few hours I've noticed battery is again at 99% and ~3700mV. I've decided to reboot the tablet once again, and this time battery was ~55% and ~3750mV. I let it charge again up to 99%, and then I've decided to give it a test on non-HD video playback from YouTube (duration of the video is ~90 minutes) with full brightness (although tablet used to lower this when no touch was detected). I was able to get two playbacks (each 90 minutes), and approximately 30-45 more minutes on the third run. In total, it gave me ~220 minutes or 3,6 hours of video playback from Youtube with wireless turned on (the first run included streaming the video from the YT).

What I've also noticed is the battery percentage drop which was weird at best. It went from 99% to ~50% pretty fast, than from 50% to 20% a little bit slower, then from 20% to 5% even slower, and it took at least 45-60 minutes from 5% to complete shut down. I've turned it on again without charging and as soon as desktop was shown, it shut down again which means battery was exhausted.

I see two problems here:
1. battery never reaching 4100-4200 mV
2. when it reaches 99%, and is rebooted, it has massive drop of at least 50% on the next boot (while still connected to the charger)

While I do understand original battery took at least 7-10 day to ever reach 4100 mV, I'm not happy the tablet staying turned on for an hour @ 2% as it can shut down at any time without me be able to predict it. I know battery prediction is dodgy on Android devices, but such battery discharge curve is not good.

I'd like to hear a second opinion (the more the better ) before I contact the seller (bought on AliExpress famous [L001] battery). One more think I've noticed is the first battery, which I've mistakenly damaged beyond repair, had printed numbers (ID, capacity, model) on the grey protection cover. This battery had white label which contained all the numbers. It seems the seller has changed the supplier between these two purchases, and the second battery was cheaper by $1.00.

[Sartre]

What kind of a charger do you have? Try and use a 2A charger. 3700mV seems way too low for 99%.

My battery had the following markings:

VDL 3.7V
6099130031 120403B

[techno.plug]

I have tried to charge it with: desktop USB port, 700ma charger (I've used this one since the day I received tablet, it did good job with the original battery), and 2100ma iPad style charger from DX (got it few days ago). I've noticed if I charge the tablet with 2100ma charger it hits the upper limit @ 3.7V (measured with voltage meter while charging was in progress), if I charge it with 700ma charger it hits the upper limit @ 3.88V even though in both cases I let it charge completely turned off for about 18 hours straight. It just doesn't want to go any further.

Right before I've turned on the tablet this morning I've measured the battery voltage and it was 3.88V. As soon as it booted into the desktop it shows 69% of the battery left (after 18 hours of charging!?) and within 2-3 minutes the voltage dropped to ~3.70V, and now showing there is ~57% battery left. I have no activity on the tablet now and BMW currently shows the voltage is steady (~3.70V, it's not dropping) but the % is dropping, it's 51% now.

I've just rebooted the tablet and it's showing there is 63% of the battery left without any charge (voltage is still ~3.70V). While I do understand percentage meter is not reliable, this is insane Going up and down with no specific reason sucks. My BMW graphs (mV, %/hour etc.) during no usage, with usage, or after reboots look like EKG which is stupid, at least.

I'm sure it's either bad battery cell or the protection board that came with the battery which doesn't allow it to reach 4.1-4.2V (original battery performed extraordinary comparing to this one in a matter of battery level gauge). I've salvaged the protection board from my other damaged battery, and the only thing I can do before I contact the seller is to try that board on this cell, and see if there is any difference. I'm reluctant to contact the seller because I know I'll have to deal with shipping the battery back which also costs, but if I have to do it to settle this issue then it's the way to go.

Markings on my battery are:
- BT 3.7V/5000mah
(BARCODE)
+ 468297 2013030753864

[techno.plug]

Back to my problem It seems the problem is not with new battery but with charging circuit inside tablet. I've already contacted the seller, and they're offering me full refund. However, I've put original battery back to the tablet for two days now and it seems it's having problem charging the battery over 4V (same thing happened for 1-2 weeks after I got the tablet).

I've measured the charging voltage and it peaks at 3.8-3.9V and doesn't want to go any further (same what happened with the new battery for which I was thinking it was faulty). I've also measured the voltage from 3 different chargers (desktop USB port, 700mA and 2100mA chargers) directly on USB port's on-board +/- pins while it was charging and it peaked from 4.75-4.85V (depending on the charging source).

Last night I've also noticed very quiet high-pitched varying noise coming from the opened tablet somewhere between USB port and battery's +/- pads on the board while tablet was charging. Just as a side note I had the same noise on my original ASUS netbook charger for 1-2 years which began approx. 6-9 months after I bought the netbook. It could either be failing capacitor or some coil from the step-up/step-down circuit making this noise. I'm not quite sure how much it adds to the charging voltage problem.

Any further input would be much appreciated