iphone 4s display light not working easy solution - Page 3 - GSM-Forum

anthraxaxis · 10-31-2012, 01:44

Hello can anybody help me with this, I think what I write might fix my no backlight but don't know what these components are for.

shad_killer · 02-02-2013, 16:05

i am facing same problem my iphone 4 no display light... celfone hit on floor... no break any ic and lcd strip but no light.. help me urgently......

Levani_Pmic · 02-02-2013, 16:13

Quote:

Originally Posted by shad_killer

i am facing same problem my iphone 4 no display light... celfone hit on floor... no break any ic and lcd strip but no light.. help me urgently......

look the screen, is it dark image or not?

golow · 03-04-2013, 14:22

[IMG]http://1.bp.********.com/-Ubo_C8exxQw/UHO6Laaqr1I/AAAAAAAABGk/7INRE_3C2KQ/s320/iphone+4+s+display+solutions.jpg[/IMG]where can jump this two point?

megus · 04-08-2013, 11:05

Hi Guys
I found this thread related to my problem.
Seems terminal 2 on the display connector has ****n circuit..
The problem now- I don't know how to solder such a small pice if circuit.
The distance (see picture) between terminal and c21 capacitor about 1.3mm
P4040410.jpg
I have small soldering iron but it seems not thin enough.
What kind of equipment r u guys using?
I see some ppl have missing components, so for me to re-solder something missing would be mission impossible..

There is a full iPhone 4s schematic if someone needed. I found it on some russian site. it has "GSM FORUM" logo on front page, so must be known here. still, if interested I can upload it somewhere.

Wites OM Tesla · 04-08-2013, 21:23

Quote:

Originally Posted by megus

Hi Guys
I found this thread related to my problem.
Seems terminal 2 on the display connector has ****n circuit..
The problem now- I don't know how to solder such a small pice if circuit.
The distance (see picture) between terminal and c21 capacitor about 1.3mm
Attachment 304142
I have small soldering iron but it seems not thin enough.
What kind of equipment r u guys using?
I see some ppl have missing components, so for me to re-solder something missing would be mission impossible..

There is a full iPhone 4s schematic if someone needed. I found it on some russian site. it has "GSM FORUM" logo on front page, so must be known here. still, if interested I can upload it somewhere.

No worry friend that schematic i made it is available here on forum.

stefanmail · 04-22-2013, 10:17

A noob question. Not so experienced with hot soldering guns.

If I solder the replacement light coil on top of the defective one (doubledecker) would that work?

Taking the defective out seems like a lot of work, but soldering it on top of the existing seems much easier.

megus · 05-04-2013, 23:24

I fix it myself (had to buy soldering station) and now it become my hobby

This iPhone still have few issues but good to learn on it..
Thanks for this thread and forum. Lots of useful information and solutions!

enisj · 05-08-2013, 20:20

Add Jump

nariz85 · 05-10-2013, 06:33

Quote:

Originally Posted by Hobson

Hello Wites my old friend.
Can you confirm the coil is the one in the image? If so it is open i think and needs replacing. Where can i take one from you know?

hello I need your help...
When I was fixing my coil, I broke the D1, then I was fixing D1 and it has broken when I was Finishing to solder it... Now I need a D1, I have an iphone 3g wich is break, could I get a D1 from there?.... if I couldn't i will have to wait anhoter mounth to get a d1 again because I'm bought it in ebay... I'm looking foward!!
Thanks!!!

TOUCHUP · 05-11-2013, 05:13

hello my friends please help me with those fl15, c82, c147 and c246 missing on iphone 4s board. Can you help how i will fix those or can i jumpers those
sorry for my bad english

hoangtuapple · 05-11-2013, 06:43

Phone work ok but no screen and blacklight
CHECK iN LCD CONNECTOR J4
L13,L14,L15,L17 IS OK
# 2 LCD_BL_CA_CONN = 4V
# 8 PP1V8_LCM_CONN =1V8
#12 LCD_RESET_CONN_L =1V6
#14 LCD_HIFA = 0.7
#16 =1V8
ALREADY CHANGE LCD CONNECTOR ,L18
But the no screen & no light .
Please help me how to solve it .

iyass · 06-17-2013, 13:13

Quote:

Originally Posted by hoangtuapple

Phone work ok but no screen and blacklight
CHECK iN LCD CONNECTOR J4
L13,L14,L15,L17 IS OK
# 2 LCD_BL_CA_CONN = 4V
# 8 PP1V8_LCM_CONN =1V8
#12 LCD_RESET_CONN_L =1V6
#14 LCD_HIFA = 0.7
#16 =1V8
ALREADY CHANGE LCD CONNECTOR ,L18
But the no screen & no light .
Please help me how to solve it .

I have the same problem
iphone 4s no screen no light
Masters??

Coryn618 · 06-18-2013, 09:19

Maybe you need professional engineers and repair parts, this will help you to solve this problem.

iyass · 06-18-2013, 11:05

i have iphone 4s, work fine, but no screen and no light!
i have changed the D1- L18 from working iPhone 4s, the connection between J4 #2 and C134 is ok.
still no light on lcd.
Any one have solved this ?

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10-31-2012, 01:44	#31 (permalink)
anthraxaxis Junior Member Join Date: Oct 2012 Location: Kanada Age: 33 Posts: 1 Member: 1830131 Status: Offline Thanks Meter: 0	Hello can anybody help me with this, I think what I write might fix my no backlight but don't know what these components are for.

02-02-2013, 16:05	#32 (permalink)
shad_killer Freak Poster Join Date: Jun 2009 Posts: 186 Member: 1043511 Status: Offline Thanks Meter: 28	i am facing same problem my iphone 4 no display light... celfone hit on floor... no break any ic and lcd strip but no light.. help me urgently......

03-04-2013, 14:22	#34 (permalink)
golow Junior Member Join Date: Apr 2008 Posts: 7 Member: 749688 Status: Offline Thanks Meter: 0	[IMG]http://1.bp.********.com/-Ubo_C8exxQw/UHO6Laaqr1I/AAAAAAAABGk/7INRE_3C2KQ/s320/iphone+4+s+display+solutions.jpg[/IMG]where can jump this two point?

04-08-2013, 11:05	#35 (permalink)
megus Junior Member Join Date: Aug 2012 Location: Brisbane, Australia Posts: 4 Member: 1793221 Status: Offline Thanks Meter: 0	Hi Guys I found this thread related to my problem. Seems terminal 2 on the display connector has ****n circuit.. The problem now- I don't know how to solder such a small pice if circuit. The distance (see picture) between terminal and c21 capacitor about 1.3mm P4040410.jpg I have small soldering iron but it seems not thin enough. What kind of equipment r u guys using? I see some ppl have missing components, so for me to re-solder something missing would be mission impossible.. There is a full iPhone 4s schematic if someone needed. I found it on some russian site. it has "GSM FORUM" logo on front page, so must be known here. still, if interested I can upload it somewhere.

04-22-2013, 10:17	#37 (permalink)
stefanmail Junior Member Join Date: Oct 2006 Posts: 11 Member: 375415 Status: Offline Thanks Meter: 1	A noob question. Not so experienced with hot soldering guns. If I solder the replacement light coil on top of the defective one (doubledecker) would that work? Taking the defective out seems like a lot of work, but soldering it on top of the existing seems much easier.

05-04-2013, 23:24	#38 (permalink)
megus Junior Member Join Date: Aug 2012 Location: Brisbane, Australia Posts: 4 Member: 1793221 Status: Offline Thanks Meter: 0	I fix it myself (had to buy soldering station) and now it become my hobby This iPhone still have few issues but good to learn on it.. Thanks for this thread and forum. Lots of useful information and solutions!

05-08-2013, 20:20	#39 (permalink)
enisj Junior Member Join Date: Feb 2012 Posts: 32 Member: 1718577 Status: Offline Thanks Meter: 2	Add Jump

05-11-2013, 05:13	#41 (permalink)
TOUCHUP Junior Member Join Date: Apr 2013 Posts: 2 Member: 1925373 Status: Offline Thanks Meter: 0	hello my friends please help me with those fl15, c82, c147 and c246 missing on iphone 4s board. Can you help how i will fix those or can i jumpers those sorry for my bad english

05-11-2013, 06:43	#42 (permalink)
hoangtuapple Junior Member Join Date: Feb 2013 Posts: 9 Member: 1879139 Status: Offline Thanks Meter: 0	Phone work ok but no screen and blacklight CHECK iN LCD CONNECTOR J4 L13,L14,L15,L17 IS OK # 2 LCD_BL_CA_CONN = 4V # 8 PP1V8_LCM_CONN =1V8 #12 LCD_RESET_CONN_L =1V6 #14 LCD_HIFA = 0.7 #16 =1V8 ALREADY CHANGE LCD CONNECTOR ,L18 But the no screen & no light . Please help me how to solve it .

06-18-2013, 09:19	#44 (permalink)
Coryn618 Junior Member Join Date: Jun 2013 Posts: 1 Member: 1962063 Status: Offline Thanks Meter: 0	Maybe you need professional engineers and repair parts, this will help you to solve this problem.

06-18-2013, 11:05	#45 (permalink)
iyass No Life Poster Join Date: Mar 2003 Location: USA Posts: 629 Member: 23534 Status: Offline Thanks Meter: 17	i have iphone 4s, work fine, but no screen and no light! i have changed the D1- L18 from working iPhone 4s, the connection between J4 #2 and C134 is ok. still no light on lcd. Any one have solved this ?