Friday, May 18, 2018

iPhone 6 Touch ID Repaired

A customer came with an iPhone 6 which having Touch ID not working. But home key still works.
He already made appointment with me so that i could check and repair on same day.

Below are the steps how i teach my staff to repair.
As usual, must need to opened it and put under microscope to check.


  1. Check the home button flex. 
  2. Check the FPC connector for home button / Touch ID. (iPhone 6 is J2118)
    Measure the voltage by using multimeter.
    Other pins just measure resistance.

Flex is good, no broken..
BUT THERE IS A BURNT MARK under the home button.






Found the shorted capacitor. Need to replace it.
But better find out why... So continue to measure FPC connector which supply power to the Touch ID.


Found out 1.8 is over power.
Check the iPhone 6 schematic to find which ic is supplying the 1.8.
In diagram look for keywords PP1V8_MESA_CONN. Search where it leads.


Found it. It's U2100.
From the diagram you can see U2100 job is taking 3V and cutting down it's current to 1.8V and supply into FPC.
Mean this IC is not doing his job. Need to replace it too. (Some technician will just borrow a 1.8v from another spot and jumper to here. But i prefer teach my staff to repair it as original designed)




Replaced burnt capacitor on Home button flex and U2100 on PCB. Then Touch ID is resurrected.
By just using basic resource and schematic can do the job without problem.

DONE!! 




Sunday, May 13, 2018

Old iPhone 4S Repair Board

Don't think we don't have provide repair for old iPhones.

Even you send us the oldest iPhone 2G (1st Gen)
We still can do it...

This time a customer sent in a iPhone 4S which failure attempted repair from other shop.

After a brief checked on it. Found out the previous repairer replaced the Power IC.
And the iPhone still unable to power on.

By looking carefully at the board, the other side of Power IC is CPU. This is very heat sensitive area. If an amateur technician try to replace the Power IC with incorrect temperature or method, it will cause CPU problem. CPU problem will cause iPhone unable to boot up.


A5 SD RAM cracked
There is a cracked line on top CPU. Usually it happened because of other side too hot and this side CPU bloated
This A5 is iPhone 4S CPU. Actually CPU was below this A5. The Apple logo with A5 part is SD RAM which sitting on CPU.
Means there is two layer for this IC. 


So the problem is this top of CPU cracked and bloated. 
All i need to do is replace the SD RAM.

Honestly to tell you that iPhone 4S doesn't worth to repair since Apple stop giving new iOS on it. Unless you have some important data need to recover.


Yes.. This customer do have important data must need to backup. We quote him RM 250 to repair. Market value of iPhone 4S is about RM350 - RM450. 
It's consider fair price to him and me (worth of my time)

So we remove the SDram from our working iPhone 4S then reball it. Left is the one reballed.

Ready to mount on top of CPU. 


Done. Lucky all the data still remain. 
Forgot take picture. But we care customer privacy so usually we don't take photo of inside.
Happy customer collected this iPhone on same day. :)


Thursday, May 10, 2018

Congratulation to new Malaysia

Yesterday vote result was huge success changing the very dark future into very bright. Tears in eyes.. i thought it's not possible..

They announced holidays for today and tomorrow. It's best stay home and avoid chaos too. Wait for smooth PM transition

We re-open as usual on Saturday! Cheers~~

Tuesday, May 8, 2018

9 May 2018 - GE-14

Tomorrow is election vote day! A lot of shops should be closed..

But we still OPEN!!  Because my home town is same place as our shop.
We might late to open our shop. Estimate 11am. We still need to vote!