K750i backlight/screen light does not light up - GSM-Forum

shahzad9 · 12-29-2005, 22:23

K750i backlight/screen light does not light up

Can use the phone but screen light does not light up!! Anyone got a solution to this problem????

THANX IN ADVANCE

Dave.W · 12-30-2005, 14:27

change LCD 100000000000%

DP-77 · 12-30-2005, 20:46

I had same problem and mine was just a poor connection to the main board

tubbe · 12-30-2005, 21:55

display connector or dc dc converter.

750iguy · 05-12-2006, 09:13

hello.. i just had the same thing happen with the backlight on my k750i today. bought the phone on ebay about 3 weeks ago. the thing was perfect.. not a scratch.

after not using the phone in ANY adverse conditions, today, i picked up the phone and the backlight would not come on. i turned off the phone and turned it back on.. the light came on, but only until it went to sleep. then it would not come back. after that, even turning it off and back on again, the backlight would not come on. I've taken the phone apart and can not find anything fishy looking around the LCD connector.. nothing obvious anyways.

any expert opinions??

ANADOLUTEKNIK · 05-13-2006, 14:53

k750i lcd light şhema pleas......

malcomxyz · 05-14-2006, 01:05

Why did you schemtics...change only LED driver ..........you can use a a 6230/K700 LED driver...works fine

quick quesyion about k750/2800 lcd

750iguy · 05-15-2006, 22:49

"display connector or dcdc converter"

1. what is a dcdc converter?
2. are you saying that these are the probable causes of the problem?
3. is it not possible that the LCD itself is broken?

malcomxyz · 05-15-2006, 23:00

DcDc = LED driver

You can also try this.....

750iguy · 05-16-2006, 00:08

thanks for the reply.. thought i don't really like the prospect of taking a soldering iron to my phone. you don't think replacing the LCD will fix the problem?

malcomxyz · 05-18-2006, 22:46

Quote:

Originally Posted by 750iguy

thanks for the reply.. thought i don't really like the prospect of taking a soldering iron to my phone. you don't think replacing the LCD will fix the problem?

No........................

750iguy · 05-27-2006, 20:49

you were right, changing the lcd didn't work.

so which option would you reccomend i try first, changing the LED driver, or soldering a new connection by the LCD connector? (i assume that picture above is of the LCD connector)

opo · 06-23-2006, 18:17

Quote:

Originally Posted by malcomxyz

DcDc = LED driver

You can also try this.....

*** bless you're post sir as i just tested on water damage phone and i can say that on this first ocasion the solution is 100% ...
Thanks and pls do me another favor and tell me how that u manage to comprehend this problem?? br

750iguy · 06-24-2006, 17:28

opo, good to hear someone has done this with success! if you would, could you please say:

1. how you obtained a replacement LED driver?
2. how did you install it?

I would VERY much appreciate knowing this. thanks.

pedmon · 07-01-2006, 12:44

I have the same issue my backlight for LCD is no longer working after replacing my camera and putting back together. copper clips are both in place. I did manage to get it lighting up at one point but even when it was it was super bright and you could not adujst the brightness in the menu. Now I can no longer get the backlight on at all.
Not sure if I am having the same LED driver issue or not. If so the soldering looks a little to fiddly for me.

Any other ideas?

12-29-2005, 22:23	#1 (permalink)
shahzad9 Freak Poster Join Date: Oct 2005 Posts: 387 Member: 191662 Status: Offline Thanks: 1 Thanked 2 Times in 2 Posts	K750i backlight/screen light does not light up K750i backlight/screen light does not light up Can use the phone but screen light does not light up!! Anyone got a solution to this problem???? THANX IN ADVANCE

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12-30-2005, 14:27	#2 (permalink)
Dave.W No Life Poster Join Date: Nov 2001 Location: England Age: 30 Posts: 2,849 Member: 7653 Status: Offline Thanks: 337 Thanked 841 Times in 304 Posts	change LCD 100000000000%

12-30-2005, 20:46	#3 (permalink)
DP-77 Junior Member Join Date: Dec 2005 Posts: 3 Member: 214960 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	I had same problem and mine was just a poor connection to the main board

12-30-2005, 21:55	#4 (permalink)
tubbe Crazy Poster Join Date: Dec 2004 Location: Sweden Age: 32 Posts: 54 Member: 100345 Status: Offline Thanks: 0 Thanked 1 Time in 1 Post	display connector or dc dc converter.

05-12-2006, 09:13	#5 (permalink)
750iguy Junior Member Join Date: May 2006 Posts: 7 Member: 275109 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	hello.. i just had the same thing happen with the backlight on my k750i today. bought the phone on ebay about 3 weeks ago. the thing was perfect.. not a scratch. after not using the phone in ANY adverse conditions, today, i picked up the phone and the backlight would not come on. i turned off the phone and turned it back on.. the light came on, but only until it went to sleep. then it would not come back. after that, even turning it off and back on again, the backlight would not come on. I've taken the phone apart and can not find anything fishy looking around the LCD connector.. nothing obvious anyways. any expert opinions??

05-13-2006, 14:53	#6 (permalink)
ANADOLUTEKNIK Junior Member Join Date: Mar 2006 Location: 100900 Posts: 5 Member: 238648 Status: Offline Thanks: 8 Thanked 0 Times in 0 Posts	k750i lcd light şhema pleas......

05-14-2006, 01:05	#7 (permalink)
malcomxyz Freak Poster Join Date: Jun 2004 Posts: 140 Member: 68105 Status: Offline Thanks: 1 Thanked 7 Times in 6 Posts	Why did you schemtics...change only LED driver ..........you can use a a 6230/K700 LED driver...works fine quick quesyion about k750/2800 lcd

05-15-2006, 22:49	#8 (permalink)
750iguy Junior Member Join Date: May 2006 Posts: 7 Member: 275109 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	"display connector or dcdc converter" 1. what is a dcdc converter? 2. are you saying that these are the probable causes of the problem? 3. is it not possible that the LCD itself is broken?

05-16-2006, 00:08	#10 (permalink)
750iguy Junior Member Join Date: May 2006 Posts: 7 Member: 275109 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	thanks for the reply.. thought i don't really like the prospect of taking a soldering iron to my phone. you don't think replacing the LCD will fix the problem?

05-27-2006, 20:49	#12 (permalink)
750iguy Junior Member Join Date: May 2006 Posts: 7 Member: 275109 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	you were right, changing the lcd didn't work. so which option would you reccomend i try first, changing the LED driver, or soldering a new connection by the LCD connector? (i assume that picture above is of the LCD connector)

06-24-2006, 17:28	#14 (permalink)
750iguy Junior Member Join Date: May 2006 Posts: 7 Member: 275109 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	opo, good to hear someone has done this with success! if you would, could you please say: 1. how you obtained a replacement LED driver? 2. how did you install it? I would VERY much appreciate knowing this. thanks.

07-01-2006, 12:44	#15 (permalink)
pedmon Junior Member Join Date: Jun 2006 Posts: 1 Member: 298984 Status: Offline Thanks: 0 Thanked 0 Times in 0 Posts	I have the same issue my backlight for LCD is no longer working after replacing my camera and putting back together. copper clips are both in place. I did manage to get it lighting up at one point but even when it was it was super bright and you could not adujst the brightness in the menu. Now I can no longer get the backlight on at all. Not sure if I am having the same LED driver issue or not. If so the soldering looks a little to fiddly for me. Any other ideas?