# How to get successful for micro usb replacement.

#### UnnamedUser159

Joined May 3, 2016
501
Hi from me.
I think i have some experience in the electronics - software, hardware and "hand"ware(soldering, desoldering, measurement and others). The one i didnt do successfully yet is micro usb replacement. Every time the electric tracks(paths) are going off. I want to desolder normal way the microusb,clean the wholes and mount the new port. I think i have all the needed tools and consumables. I am scare not to spoil everything and to have to buy a new tablet. I use the heat gun but nothing is happened and when apply some more force the usb port is going partly out and everything goes to hell. I have heat resistance tape here and almost new flux pen. What is the normal temperature (celsius) with i wont spoil anything but got the job done - I talk for the heat gun - it is YaXun 881D.

Mods edit:
This thread was split from -- Need help how to de-solder micro-b usb connector.

#### NoelSof

Joined Sep 22, 2015
12
Hi from me.
I think i have some experience in the electronics - software, hardware and "hand"ware(soldering, desoldering, measurement and others). The one i didnt do successfully yet is micro usb replacement. Every time the electric tracks(paths) are going off. I want to desolder normal way the microusb,clean the wholes and mount the new port. I think i have all the needed tools and consumables. I am scare not to spoil everything and to have to buy a new tablet. I use the heat gun but nothing is happened and when apply some more force the usb port is going partly out and everything goes to hell. I have heat resistance tape here and almost new flux pen. What is the normal temperature (celsius) with i wont spoil anything but got the job done - I talk for the heat gun - it is YaXun 881D.

Mods edit:
This thread was split from -- Need help how to de-solder micro-b usb connector.
Micro usb port is a surface-mount device that has 4 additional legs to secure it in place. Remove them first with a soldering iron and a solder sucker.
It sounds to me that you have already ruined the tracks in your first try.

#### UnnamedUser159

Joined May 3, 2016
501
Hi there.
First of all i want to apologyze if i have choosed wrong category in the forum. I will understand where exactly to post my things soon

I have one tablet by myside. It was in this condition when i see it. Ive cleaned the board where the microusb should be soldered with F-02 Anti-Flux Spray but i dont think that this tablet gonna works. I have here lacker(i hope thats the correct word because my translation in Google) with Silver for building paths but maybe is very micro for me if at all it could be done succesfully.

Greetings

*Chance

[Moderator's note: This post moved from another thread about the same tablet.]

Last edited by a moderator:

#### UnnamedUser159

Joined May 3, 2016
501
So first of all Have to add new tino on these four(in this case) points and remove all the tino with solder sucker from these four holes?
Then just use the heat gun and the whole usb port should falls off? What is a good temperature in celsius for that and for example in what minutes it will be heated good to goes off? Of course i want only a approximately time ;

#### jpanhalt

Joined Jan 18, 2008
11,088
A picture of what you have done will be worth a 1000 words or more. That way, it will be possible to see what damage may have been done to the board.

There is a type of silver coating that can be soldered to; however, from your description of using a "lacquer" in your other thread, I do not think what have can be soldered.

The subjects in your three threads subjects seem enough alike that a single thread may be the best way to get help that will not be confusing.

John

#### UnnamedUser159

Joined May 3, 2016
501
So..

one question is for procedure of micro usb replacement. I did it one-two times maybe but not successfull.

"
So first of all Have to add new tino on these four(in this case) points and remove all the tino with solder sucker from these four holes?
Then just use the heat gun and the whole usb port should falls off? What is a good temperature in celsius for that and for example in what minutes it will be heated good to goes off? Of course i want only a approximately time ;
"

question #2
I attach 2 images of tablet board and the question is it it posible at all to be inserted full functional microusb on that board

#### jpanhalt

Joined Jan 18, 2008
11,088
It appears that the pads in the area labeled USB have been damaged and perhaps destroyed:

There do appear to be plated through vias that may be connected to where the pads were. If that is the case, the solder mask on those vias can be removed. I have used a "spot sanding pen" to do that. Here is an example:

The pen allows fine control of the area to be scraped and does not remove the thin copper ring around the via. However, one can also use a sharp, pointed blade like a #11 to do the same.

Once you remove the solder mask from the via, you will have something to solder to. It is detailed work, but can be done. Silver bearing conductive ink might also work, but as mentioned, you probably cannot solder to it.

John

#### UnnamedUser159

Joined May 3, 2016
501

I put the tape to protect the smd elements.

I see in video in WWW that they heat on side which from we can see the 5 pins. They are heating the two+two not electric pins and the 5 pins. After maybe minute and everything is ok in the clip - the microusb port is not anymore at the board. In the clip they say 275 Farenheit. I calculate it to 135 C. Nothing is happening. I am scare to do things on my own. I dont scare to send the board to hell, just want to ask before doing stupid things.

I am ataching photos...

#### jpanhalt

Joined Jan 18, 2008
11,088
None of the common solders melt at 135°C! Are you sure they meant 275°F?

What video are you trying to follow?

John

#### bertus

Joined Apr 5, 2008
21,667

#### KeepItSimpleStupid

Joined Mar 4, 2014
5,090

So, you can try putting them back on using copper tape: https://www.sparkfun.com/products/10561
You will have to remove the resist from the VIAs and connect to the vias.

Wire-wrap wire is often used for repair. It will be DIFFICULT.

#### NoelSof

Joined Sep 22, 2015
12
Is that the same board? I thought the port is already popped off in your previous picture?
I'm confused.
And now you want to detach it again.
Anyway, If the 4 legs have been desoldered, you can carefully put a gentle tension upward on the port, with like a needle, and then blow the hot air to it.
When the solder wants to melt it will melt, so please stop calculating that temperature nonsense.

#### MrAl

Joined Jun 17, 2014
8,549
Hi,

Notwithstanding the apparent failure of this current project, this is a very good thread. I say this because i think a lot of people are going to want to do this in the future. I base that on complaints i have read around the web about devices that have micro USB connectors on the product board. They dont like them because they are too fragile. That combined with the fact that they are installed on some VERY expensive equipment means people are going to want to change them at some point or maybe pay someone to change them for them. I am hoping that in most cases this is possible if done right. I myself have not done a replacement job yet though, so i have no idea how hard this would be to do even starting fresh with a good board with no ruined traces.

I have had one experience already though with a mini USB connector on a board. I can only imagine the same problem with a micro USB connector in some situations. What happened was when i went to pull the USB plug out of the socket on the board i lifted it up slightly as i was pulling, and it ripped the whole connector right off the board surface. Unfortunately that also lifted some traces going to the connector. The product the board goes in still works, but there's no USB connectivity anymore. For an expensive device this can be very troubling.

A work around for smart phones (and other devices) is to get a Universal Li-ion battery charger, and take the battery out to charge it in the battery charger. It is more of a pain but at least you can still use the phone. The Universal type chargers have a moving connector system where you slide the connectors to fit the battery, so they fit a wide range of battery makes and models. For example my charger works on any cell phone battery and also my camera battery, and these batteries are very different sizes (but all are the flat ones).

I probably cant fix that mini USB connector but if they are removed carefully they might be replaceable. SMD parts are not really made to be unsoldered and resoldered though, and those traces are very small and narrow so they will lift off the board easy. We'd have to use the least heat possible for the shortest time.
What might help possibly is to experiment with some devices you dont want any more, such as old stuff laying around taking up space and collecting dust. Try taking the connector off carefully and replacing it, then testing for operational function. If it works, you must really know what you are doing and can probably go on to fix the devices you really need to fix

Good luck to all.

#### jpanhalt

Joined Jan 18, 2008
11,088
Hello,

The only "solder" at about 135 °C would be Bi58Sn42, wich is very uncommon.
https://en.wikipedia.org/wiki/Solder
Actually, I was was curious about the video to which the TS referred, as one possibility is that a bismuth or indium solder (e.g., ChipQuik, http://www.chipquik.com/store/product_info.php?products_id=210002 ) had been added to lower the resulting alloy's melting point. Of course, adding that other "solder" is an important detail that the TS didn't mention and probably didn't do.

John

#### takao21203

Joined Apr 28, 2012
3,702
strange techniques.

sometimes I need to solder these.
All I use is a broad tip.

If youve ruined the tracks you need a breakout PCB for the new socket, then use wires.
With a point tip you cant solder USB socket. You need to solder them completely with plenty of solder, or they wont stick properly to the PCB.

micro USB is a total disaster, I bought almost 20 yokes, none works properly. Mini USB never a problem.
Whats this good for, to save 2mm thickness or 3mm?

#### R!f@@

Joined Apr 2, 2009
9,751
I use liquid solder and flux to solder these microUSB's. Easy peasy !

If the tracks are gone then it is hell. Cannot use solder paste and heat gun. Manually solder thin wires to the USB pin and then solder the port using a fine tip.
Dunno if you could do that without a microscope but tht's how I do it.

#### UnnamedUser159

Joined May 3, 2016
501
So...
i work in small service and am still learning and dont really like to cannot do something. Have enough strenght and madness to learn the most things no matter what will be break and on.... have to do the most things which dont requiere very expensive "tools".

I also thought about that temperature. But maybe the first video in Google shows that. Maybe its fu*king mistake. Are gonna 275 C fail something?

Some king of joke - maybe people uploaded this video want the people to fail they board and the next time to pay them 30$for this service. Greetings #### Sensacell Joined Jun 19, 2012 2,917 It's important to acknowledge that these modern electronic devices are NOT intended to be repaired. What you are attempting borders on impossible- unless you want to invest an inordinate amount of time and energy perfecting some technique that still might fail 40% of the time. If you do the math on what your time and sanity are worth- it's not a good rate of return. #### R!f@@ Joined Apr 2, 2009 9,751 It's important to acknowledge that these modern electronic devices are NOT intended to be repaired. What you are attempting borders on impossible- unless you want to invest an inordinate amount of time and energy perfecting some technique that still might fail 40% of the time. If you do the math on what your time and sanity are worth- it's not a good rate of return. I beg to differ. So far I had 100% success on these kinda of problems #### jpanhalt Joined Jan 18, 2008 11,088 So... i work in small service and am still learning and dont really like to cannot do something. Have enough strenght and madness to learn the most things no matter what will be break and on.... have to do the most things which dont requiere very expensive "tools". I also thought about that temperature. But maybe the first video in Google shows that. Maybe its fu*king mistake. Are gonna 275 C fail something? Some king of joke - maybe people uploaded this video want the people to fail they board and the next time to pay them 30$ for this service.

Greetings
You have mentioned a couple of videos of the process and particularly the one you followed. It's likely I missed the links. Can you repost them or give the reply number that has them?

John