| Author：Juan Pablo |
Title：Macbook pro no charge issue |
|
Time：2014/12/3 20:54:01 |
Hi my name is Juan Pablo I'm from Argentina, I'm into surface level repair work on my own.
If you can provide me some help to solve my problem I would be more than grateful, if you
need me to pay some fee for your to explain me in detail I would make the payment if it's reasonable. I came up to find a well detailed explanation of the power on sequence on your
main website which seemed to me INCREDIBLE ! nowhere found.
So I'll explain my situation. I got an unibody macbook pro 2008 Motherboard 820-2330-A. I do take al precautions knowing how thermal cycles affect the solder joints. So my computer was in such a position that the lid had perfect airflow for the fans. In fact I had all the fans both at 5900rpm. I was running Windows 7 natively.
So I used my macbook plugged in on AC with the removable battery. And honestly i never swtiched it off . But at times when the electricity went off it was the only time the battery drained entirely and turned off.
Now what started happening was that once that happened the lap would not turn on. I searched all over the net and someone at Ifixit said you had to press power button for 10 seconds.. plug magsafe keep pressing it for 10 seconds more.. depress and press again . To my astonishment that made it work.
Now , I never really cared much about that..didn't pay much attention .. thought it would be something that might happen a couple of times.
But now I dissasembled it to clean the heatpipe radiator fins I disconnected the fans vacuumed them and then IT DIDNT" START! I folllowed the exact sam eprocedure as before.
SO what should I do , I managed to get the schematic for my motherboard. I thought about doing a manual SMC reset from the logicboard pads which I did.
-I DID FIND ! A SMALL RECHARGABLE BATTERY ON THE LOGIC BOARD which was in bad condition like as mall button cell which was soldered and said F8430 on top on schematics it's labeled PP3V3_G3_SUPERCAP could this affect the power on sequence?. i'm thinking this might be the reason some times the other procecure worked but I don't know what voltage this button cell is
Picture for the button cell is on this link
http://oi39.tinypic.com/2u6cshi.jpg
http://postimg.org/image/uhhr2vyl7/full/
So going on with the story, I started to touch some of the QFN IC's to see if any of them started getting HOT to the touch. So I did find an IC from intersil ISL6269 (U7750) which is running extremely hot to the touch, even without pressing the power button. I just had the logicboard out of the case just with the magsafe board plugged psu and it was burning hot to the touch. I did also reflowed the solder on the EFI chip just in case as I've found one guy on youtube saying solders were dry , but nothing.
Something to do have into consideration is , I do repair notebooks as well and I'm used to GPU BGA's to be desoldered cause of cracked solder joints and thermal cycle stress. So my macbook in question , always had fans at a full speed 5900rpm.. the lid was in such an angle that airflow was precise. I can't believe any of the bga's might have desoldered from the board.
So I ordered a sample from intersil ISL 6269 desoldered the old package soldered the new one, and the machine started. it was that damn intersil part which supposedly managed the PWM pulse width modulation driving the fans.. I'm suspecting it might have come faulty. Cause I mostly used my mac with bootcamp win7 natively overriding SMC controller running fans at full speed.
This happened a long time ago, but it started to happen again, machine doesn't turn on with the power on button.
Now please pay attention to the following.
I managed to heat up the area surrounding where the EFI IC it's soldered with my rework station slowly for a couple of seconds. MAGSAFE not connected. I plug MAGSAFE and machine turns on. So seems there's something that with heat make's the logic board power on work .
Question is , Can you guide me as to check what could be going on here. The original battery of my macbook started to get bloated but charges fine. I ordered a replacement battery from OWC plugged it in but it doesn't charge. With the old swollen battery it charges , this really complicates me.
This is the area I heat up
http://oi57.tinypic.com/102tixg.jpg
I don't know if the problem could be the Intersil part I soldered back ago (it's not hot to the touch anymore) , if It could be the EFI bios chip, SMC BGA .
If you have skype can we talk over there. Thank You.
|
|
| Admin Reply: Dear customer, the area you heated up are bios chip and ddr memory power chip ,the chip you replaced is northbridge power chip ,they are all no relation with battery charge function ,we think you made some damage to another components ,your repair method is very ridiculous ,you just guess and do it ,it's very dangerous ,you need analyze it and repair it ,it's not so easy ,we are all from Apple factory ,we do this job almost 20 years ,from you plug the power charger until the laptop running ,there are almost 32 steps, every step has almost 10 siginals ,you need know all the signals ,and then you can repair it . Good luck ! |
| Author：D. Kovacs |
Title：ipad mini fell out |
|
Time：2014/6/14 14:38:17 |
Hi, my friend recommended you as you did repair his ipad as well. Our ipad
>>>fell out of my daughter's hand from cca. 80cm height, but the front panel
>>>broke completely (see attachment). I am not sure about the software, it's
>>>powered off, but I think it's ok. I need it fixed by the end of a week.
>>>How much does it cost, if only the panel will be changed.
>>>
>>>Thank you!
>>>
>>>Best regards,
>>>
>>>D. Kovacs |
|
| Admin Reply: Thank you ,it's only several hundreds rmb . |
| Author：a |
Title：macbook repair |
|
Time：2014/2/10 14:54:04 |
Dear Mac SUNNY,
I would like to have my Mac repaired at your place. What is your address and what guarantees can you give?
Best,
Andriy Naavhust |
|
| Admin Reply: ;its very near subway line 10,Shui cheng rd station ,you can leave by exit 3, and then walk forward the South,when you see yan'an elevated road, just walk across it. and then you see Carrefour Gubei store ,our repair office just opposite the store ,across the street ,it's Room 302,Building 16,NO. 51, Shuicheng south rd.水城南路51号，古北家乐福对面。
|
| Author：Dave |
Title：acer laptop issue |
|
Time：2013/11/9 21:02:24 |
i have a an acer laptop which is now 5 years old and until recently it was still working well but a few weeks ago i started to have problems starting the computer up...i never got that bleep and the computer never booted up. turning the compouter on and off a couple of times seemed to do the trick but i then went away for three weeks and now i can not start the computer at all....
i dont want to spend a lot of money if it is not likely to last very long once fixed although finding computers in shanghai with english operating systems might be difficult.
can you advise please
second question....i have been "given" a computer from my work place but it still has all the admin controls in place and i dont know how to bypass them. I am more than happy to wipe the computer clean but where do i get a new windows operating system from and how much would it cost in shanghai. do you supply?
I am based near hongqiao lu metro so not far from yourselves...
if you can let me know what you suggest and how much it might cost i would be grateful,
Dave |
|
| Admin Reply: Dear customer, it's the motherboard or display card or memory problem,we can help you. |
|
|
