Ipad 1: Backlight problem - GSM-Forum

davduv · 06-29-2012, 10:21

Hi,
I have a Backlight problem in my ipad1, when I click the power button the backlight blink for a second and then gone.

I replaced the 4R7 coil and the problem was still not solved.
I tried:
1. restore all settings and then upgrading OS.
2. Playing with brightness slider UP and DOWN for a few times.
3. Holding Home+Power buttons at the same time, resetting IPAd.
4. disconnecting and connecting the battery.
5. cleaned the motherboard very gently with 99.6% alcohol .
6. Replacing 4R7 coil.

NONE OF SUCCESSES !

I am 100% sure the LCD screen (and the data cable) works because I connected it to another ipad and it works just fine.

So it seems the problem is not in the LCD screen but in my motherboard.
What could be the problem?
Should I replace the IC chip too?
Or should I make a jumper like shown in this picture:
http://img228.imageshack.us/img228/8...3539db07bc.jpg

Thank you.

davduv · 07-01-2012, 19:20

Anyone?
Mr. Lewis? Mr. Randall? Mr. Wites? Hello?

davduv · 07-05-2012, 16:55

I replaced the 4r7 coil and even make a jumper between the lcd board and the ipad motherboard - NO Success !
Is this mean the IC is damaged?
How can I know if the IC is damaged or not?

(I have electronic equipment multimeter soldering station and so..)

davduv · 07-05-2012, 17:31

2 things I forgot to mention about the backlight problem:

1. I don't remember that the backlight has blinked before replacing the 4r7 coil.
2. I replaced the 4r7 coil with this coil that I ordered from here:
VLF3010AT-4R7MR70 - TDK - INDUCTOR, POWER LINE, 4UH, 0.7A | Farnell United Kingdom

When I got the ordered coil I've noticed that It looks exactly 1:1 the same as the original 4r7 from the ipad (with 4r7 printing on top).

could it be that I've made a mistake and ordered the wrong coil?

could it be that the replaceable coil doesn't have enough power to drive the backlight and the result is a backlight blinking for a second?

**Wites OM Tesla** · 07-05-2012, 19:11

Quote:

Originally Posted by davduv

2 things I forgot to mention about the backlight problem:

1. I don't remember that the backlight has blinked before replacing the 4r7 coil.
2. I replaced the 4r7 coil with this coil that I ordered from here:
VLF3010AT-4R7MR70 - TDK - INDUCTOR, POWER LINE, 4UH, 0.7A | Farnell United Kingdom

When I got the ordered coil I've noticed that It looks exactly 1:1 the same as the original 4r7 from the ipad (with 4r7 printing on top).

could it be that I've made a mistake and ordered the wrong coil?

could it be that the replaceable coil doesn't have enough power to drive the backlight and the result is a backlight blinking for a second?

Can you mark in picture where is located i think is not right coil that you replaced?

davduv · 07-05-2012, 23:56

Yes, this is the picture of the board without EMI shield (Not my board), the 4r7 coil area is marked in red.

this is my replaceable coil in my board:

The package I bought of 4r7 coil:

**Wites OM Tesla** · 07-06-2012, 17:06

From my investigation of ipad board that coil is for touch supply,for backlight is other coil.
I can make full right solution then you and not only you can fix allot of ipad no light but i need some bust for that.

davduv · 07-06-2012, 17:38

Are you sure?
From my investigation (a lot googling) this coil and the IC next to it are responsible for backlight problems if they damaged.
Anyway my touch is working perfectly although I replaced the coil (maybe different coil).

How many bust do you think you'll required for 100% working solution?

**Wites OM Tesla** · 07-06-2012, 19:12

Quote:

Originally Posted by davduv

Are you sure?
From my investigation (a lot googling) this coil and the IC next to it are responsible for backlight problems if they damaged.
Anyway my touch is working perfectly although I replaced the coil (maybe different coil).

How many bust do you think you'll required for 100% working solution?

Ok man do a test unsolder that 4R7 coil see what happen after this we talk more.

davduv · 07-11-2012, 15:50

Sorry for the late response Mr. Wites.

I've just now did what you suggested and apparently you are right.
After removing the coil the touch is no longer responding !
I solder this coil again and the touch come back to work.

But I did not found another 4r7 coil in the board

.
I'm confused...

**Wites OM Tesla** · 07-11-2012, 17:05

Quote:

Originally Posted by davduv

Sorry for the late response Mr. Wites.

I've just now did what you suggested and apparently you are right.
After removing the coil the touch is no longer responding !
I solder this coil again and the touch come back to work.

But I did not found another 4r7 coil in the board

.
I'm confused...

Ok man pay me 15$ and i make for you right light solution or you can pay me more and i send to you in private so only you know how to fix no ipad 1 backlight all people will come to you even some nub masters will send to you for repair,i can even make no touch solution,no charging,USB not detected and even more.

ifonman · 07-11-2012, 17:52

interested in this repairment

davduv · 07-13-2012, 14:39

Quote:

Originally Posted by ifonman

interested in this repairment

Are you interested in sharing the 15$ cost with me?

Sitrucmit · 07-14-2012, 02:00

I have the same issue as davduv. i went 1 step further and replaced the lCD as well.

the last repair was to replace the 4r7 coil and still no luck.

Please Mr Wites- what is the repair method and how and where do i donate ???

**Wites OM Tesla** · 07-15-2012, 14:54

Quote:

Originally Posted by Sitrucmit

I have the same issue as davduv. i went 1 step further and replaced the lCD as well.

the last repair was to replace the 4r7 coil and still no luck.

Please Mr Wites- what is the repair method and how and where do i donate ???

Here friend this solution is thanks to you.
Before Open a Thread Search Here Hardware Solutions!

06-29-2012, 10:21	#1 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	Ipad 1: Backlight problem Hi, I have a Backlight problem in my ipad1, when I click the power button the backlight blink for a second and then gone. I replaced the 4R7 coil and the problem was still not solved. I tried: 1. restore all settings and then upgrading OS. 2. Playing with brightness slider UP and DOWN for a few times. 3. Holding Home+Power buttons at the same time, resetting IPAd. 4. disconnecting and connecting the battery. 5. cleaned the motherboard very gently with 99.6% alcohol . 6. Replacing 4R7 coil. NONE OF SUCCESSES ! I am 100% sure the LCD screen (and the data cable) works because I connected it to another ipad and it works just fine. So it seems the problem is not in the LCD screen but in my motherboard. What could be the problem? Should I replace the IC chip too? Or should I make a jumper like shown in this picture: http://img228.imageshack.us/img228/8...3539db07bc.jpg Thank you.

07-06-2012, 17:06	#7 (permalink)
Wites OM Tesla Moderator Join Date: Apr 2009 Location: Moldova,Chisinau. Age: 27 Posts: 3,432 Member: 1017374 Status: Offline Thanks: 68 Thanked 2,435 Times in 972 Posts	Not right 4R7 coil is for touch +18V Supply like on ipad 2. From my investigation of ipad board that coil is for touch supply,for backlight is other coil. I can make full right solution then you and not only you can fix allot of ipad no light but i need some bust for that.

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07-01-2012, 19:20	#2 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	Anyone? Mr. Lewis? Mr. Randall? Mr. Wites? Hello?

07-05-2012, 16:55	#3 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	I replaced the 4r7 coil and even make a jumper between the lcd board and the ipad motherboard - NO Success ! Is this mean the IC is damaged? How can I know if the IC is damaged or not? (I have electronic equipment multimeter soldering station and so..)

07-05-2012, 17:31	#4 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	2 things I forgot to mention about the backlight problem: 1. I don't remember that the backlight has blinked before replacing the 4r7 coil. 2. I replaced the 4r7 coil with this coil that I ordered from here: VLF3010AT-4R7MR70 - TDK - INDUCTOR, POWER LINE, 4UH, 0.7A \| Farnell United Kingdom When I got the ordered coil I've noticed that It looks exactly 1:1 the same as the original 4r7 from the ipad (with 4r7 printing on top). could it be that I've made a mistake and ordered the wrong coil? could it be that the replaceable coil doesn't have enough power to drive the backlight and the result is a backlight blinking for a second?

07-05-2012, 23:56	#6 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	Yes, this is the picture of the board without EMI shield (Not my board), the 4r7 coil area is marked in red. this is my replaceable coil in my board: The package I bought of 4r7 coil:

07-06-2012, 17:38	#8 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	Are you sure? From my investigation (a lot googling) this coil and the IC next to it are responsible for backlight problems if they damaged. Anyway my touch is working perfectly although I replaced the coil (maybe different coil). How many bust do you think you'll required for 100% working solution?

07-11-2012, 15:50	#10 (permalink)
davduv Insane Poster Join Date: May 2012 Posts: 62 Member: 1760636 Status: Offline Thanks: 35 Thanked 7 Times in 4 Posts	Sorry for the late response Mr. Wites. I've just now did what you suggested and apparently you are right. After removing the coil the touch is no longer responding ! I solder this coil again and the touch come back to work. But I did not found another 4r7 coil in the board . I'm confused...

07-11-2012, 17:52	#12 (permalink)
ifonman Freak Poster Join Date: Jun 2010 Location: Canary islands Age: 42 Posts: 168 Member: 1332831 Status: Offline Thanks: 75 Thanked 6 Times in 6 Posts	interested in this repairment

07-14-2012, 02:00	#14 (permalink)
Sitrucmit Junior Member Join Date: May 2012 Posts: 2 Member: 1758894 Status: Offline Thanks: 1 Thanked 0 Times in 0 Posts	I have the same issue as davduv. i went 1 step further and replaced the lCD as well. the last repair was to replace the 4r7 coil and still no luck. Please Mr Wites- what is the repair method and how and where do i donate ???