Hardware Advices for Technicians Read Before Rework!

[short_toground]

Steps for troubleshooting dead phone? Test points or?

[segun]

Originally Posted by gscardua

A person told me that a toothbrush is very electrostatic and recommended that I stay away. This same guy recommended to use 450°C and medium air flow to solder/dessolder SMD components from iphone motherboard. As I can read from experts on this forum this is not true. I don't know what I think. Sorry my English and thanks.

What ever heat temp you wanna use its up to you, follow the rules , start from a gentle temperature and work your way up, as for me i start from 280-350-450 depends, how ever i i do same with the air flow and very importantly do not spend much time heating , so you dont damage other components, some boards dont like too much heat.

[segun]

Originally Posted by short_toground

Steps for troubleshooting dead phone? Test points or?

Dc power supply, multi meter, a similar board with minor faults and test points.

[excessive]

Originally Posted by Nipsta

How do u go about removing the black glue on the tiny components like resistors and caps. im scared to scrap it off because it might pry off the tiny components. please advise and thanks in advance

I'll try to make a small video to show you, anyway it's all about experience.
And depends on which components you have to clean and what components are around.
I personally go for 220 degrees and air 30/40 on 100 (on ayoue system)

Then gently and slowly scrap the glue with the tip of a cutter.

Better to start, then stop and clean, and then start again.

You need time and especially patience. If you getting nervous better to have a break and continue after some time.

MANDATORY is the buses of a microscope

Sent from my SM-G925F using Tapatalk

[excessive]

[QUOTE=Nipsta;11944758]

Originally Posted by Kradziej

First you must use microscope to do this especially for 01005, for 0402 and above you can use mag. glass i guess
Use heatgun (settings like 250/90 on quick heatguns) and very thin tweezers or easier available insulin syringe and just scrap it off lightly around element, heat will nicely soften the glue and it will come off

can i use a solder iron at 250 degrees f to heat black glue instead? then carefully scrape with a needle?

Nooo. No microsoldier. The risk is to ruin the components.



Sent from my SM-G925F using Tapatalk

[albhosts]

And for iphone 6 what suggest me to remove eeproms and resina black how many degree i need to reflow?

[excessive]

Originally Posted by albhosts

And for iphone 6 what suggest me to remove eeproms and resina black how many degree i need to reflow?

For Black resina I use 210 degrees, airflow medium. For the nand depends... try between 290 and 350

Sent from my SM-G925F using Tapatalk

[olixman]

Hi guys!
First post here.

What stencils do you use for reballing?
I have a some stencils from China and they deform when trying to reball something small (like baseband from iphone 6), and the paste goes under it, shorting everything.
This is happening even if I do press the stencil down on the chip.
Are the 0.2mm balls available for sale, a better solution instead of the solder paste?

[gyurma85]

Originally Posted by olixman

Hi guys!
First post here.

What stencils do you use for reballing?
I have a some stencils from China and they deform when trying to reball something small (like baseband from iphone 6), and the paste goes under it, shorting everything.
This is happening even if I do press the stencil down on the chip.
Are the 0.2mm balls available for sale, a better solution instead of the solder paste?

Put something soft under the ic, paper towe....

[gulzaib07]

i phone 5s restart again and again on apple log0

[olixman]

Originally Posted by gyurma85

Put something soft under the ic, paper towe....

This sorta did the trick. Thanks!
But after some hardening of the paste, I put some flux and then heat again.
Works like a charm.

[hanen]

Thanks rally good info

[mds nadeem]

hello.

hardware experts can u advice me the problem we change both audio ic but still condion same

plz ckeck the link no sound

http://forum.gsmhosting.com/vbb/f631...sound-2228438/

[short_toground]

What’s best air flow setting for avoiding heat on near by components?

Minimum air with high temperature or higher air with lower temperature?

[miki9a9]

try airplane paint stripper! it works like a charm