Iphone 4S blankscreen after wifi module changed - GSM-Forum

kaytar · 08-12-2014, 10:22

Phone is working, can receive calls, itunesc recognize phone, but blankscreen. Need some help, please! Wifi and bluetooth not working, so i replaced USI 339S0154 ic. After that, ic goes hot, so i removed it and now still blankscreen.

arvaser · 08-12-2014, 11:05

Check using microscope components near lcd connector.. I believe that you accidently removed at least one of them or damaged tracks on board..

shanry · 08-12-2014, 11:07

Quote:

Originally Posted by arvaser

Check using microscope components near lcd connector.. I believe that you accidently removed at least one of them or damaged tracks on board..

maybe your right..............

kaytar · 08-12-2014, 11:18

Checked 5 times. All components there

Exkurs · 08-12-2014, 11:50

I have the same problem.
http://forum.gsmhosting.com/vbb/f631...creen-1846651/
Maybe not all of your wifi pins have contact.
I don't think I overheated the CPU.

kaytar · 08-12-2014, 13:00

Tried again with the old chip. Result: if i press harder on wifi chip, screen goes ON

Exkurs · 08-12-2014, 13:19

So you get apple logo and iOS screen with soldered wifi chip?

kaytar · 08-12-2014, 14:11

Yes, that's right! One more thing: the CPU is combined by two pieces and i have just the bottom one, i mounted back on mainboard and the display is fine.

dog68 · 08-12-2014, 14:41

Resolder the lcd connector anyway, it may look fine, but not connecting enough. are you using heat gun under the wifi?

Exkurs · 08-12-2014, 14:52

What do you mean with the CPU is combined by two pieces?
Did you remove and reball the a5 processor?
I'm waiting for a new wifi chip. Like you said, when wifi is soldered back properly the screen should work again right?
Without wifi chip or incorrect soldered wifi, screen stays black!?

kaytar · 08-12-2014, 14:55

CPU = wifi chip. this chips have two layers... I will post some photos after i charge the camera battery.

kaytar · 08-12-2014, 19:37

Here is the image of wifi module, splited in half :P

danisajee · 08-12-2014, 19:48

Quote:

Originally Posted by Exkurs

I have the same problem.
http://forum.gsmhosting.com/vbb/f631...creen-1846651/
Maybe not all of your wifi pins have contact.
I don't think I overheated the CPU.

I had wifi module over heat when ipower on iphone 4s. And just removed wifi module.. And custemer won't change module bcz of mony cost.. I had never any lcd issue... So their is no any lcd problem if you remove wifi module ...

kaytar · 08-12-2014, 19:58

I can guarantee that this 4S won't display anything, but backlight after removed wifi module.

Exkurs · 08-12-2014, 21:36

Like my 4s...no Screen without wifi Module.

08-12-2014, 10:22	#1 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	Iphone 4S blankscreen after wifi module changed Phone is working, can receive calls, itunesc recognize phone, but blankscreen. Need some help, please! Wifi and bluetooth not working, so i replaced USI 339S0154 ic. After that, ic goes hot, so i removed it and now still blankscreen.

08-12-2014, 11:05	#2 (permalink)
arvaser Freak Poster Join Date: Jun 2013 Posts: 178 Member: 1952487 Status: Offline Thanks Meter: 43	Check using microscope components near lcd connector.. I believe that you accidently removed at least one of them or damaged tracks on board..

08-12-2014, 11:18	#4 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	Checked 5 times. All components there

08-12-2014, 11:50	#5 (permalink)
Exkurs Freak Poster Join Date: Aug 2013 Location: Germany Posts: 121 Member: 1996518 Status: Offline Thanks Meter: 15	I have the same problem. http://forum.gsmhosting.com/vbb/f631...creen-1846651/ Maybe not all of your wifi pins have contact. I don't think I overheated the CPU.

08-12-2014, 13:00	#6 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	Tried again with the old chip. Result: if i press harder on wifi chip, screen goes ON

08-12-2014, 13:19	#7 (permalink)
Exkurs Freak Poster Join Date: Aug 2013 Location: Germany Posts: 121 Member: 1996518 Status: Offline Thanks Meter: 15	So you get apple logo and iOS screen with soldered wifi chip?

08-12-2014, 14:11	#8 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	Yes, that's right! One more thing: the CPU is combined by two pieces and i have just the bottom one, i mounted back on mainboard and the display is fine.

08-12-2014, 14:41	#9 (permalink)
dog68 No Life Poster Join Date: Mar 2012 Location: cambridgeshire, England Age: 55 Posts: 760 Member: 1728699 Status: Offline Thanks Meter: 212	Resolder the lcd connector anyway, it may look fine, but not connecting enough. are you using heat gun under the wifi?

08-12-2014, 14:52	#10 (permalink)
Exkurs Freak Poster Join Date: Aug 2013 Location: Germany Posts: 121 Member: 1996518 Status: Offline Thanks Meter: 15	What do you mean with the CPU is combined by two pieces? Did you remove and reball the a5 processor? I'm waiting for a new wifi chip. Like you said, when wifi is soldered back properly the screen should work again right? Without wifi chip or incorrect soldered wifi, screen stays black!?

08-12-2014, 14:55	#11 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	CPU = wifi chip. this chips have two layers... I will post some photos after i charge the camera battery.

08-12-2014, 19:37	#12 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	Here is the image of wifi module, splited in half :P

08-12-2014, 19:58	#14 (permalink)
kaytar Freak Poster Join Date: Oct 2005 Age: 41 Posts: 338 Member: 188715 Status: Offline Thanks Meter: 31	I can guarantee that this 4S won't display anything, but backlight after removed wifi module.

08-12-2014, 21:36	#15 (permalink)
Exkurs Freak Poster Join Date: Aug 2013 Location: Germany Posts: 121 Member: 1996518 Status: Offline Thanks Meter: 15	Like my 4s...no Screen without wifi Module.