Samsung alpha g850f no backlight. Phone clean no water damage. - GSM-Forum

gsmnas · 03-30-2015, 19:00

Hello guys,

i have a samsung galaxy alpha no backlight. Phone is still working good because phone power on and i can use touchscreen (i hear the song) but i see nothing on the screen. motherboard is clean , no water, no parts broken or something. I think backlight ic or something not work. I need schematics or any help. (and of course i test new screen but not working...)

Thanks

d-Artigo · 03-31-2015, 06:16

Quote:

Originally Posted by gsmnas

Hello guys,

i have a samsung galaxy alpha no backlight. Phone is still working good because phone power on and i can use touchscreen (i hear the song) but i see nothing on the screen. motherboard is clean , no water, no parts broken or something. I think backlight ic or something not work. I need schematics or any help. (and of course i test new screen but not working...)

Thanks

samsung sm-g850f light ways
ic rehot first backlight U900
the second check one by one its light path
see the picture below

only press thank

gsmnas · 04-02-2015, 14:16

Just tested reflow U900 but No result... We will try to check rest of solution and will inform you. And thanks

gsmnas · 04-14-2015, 17:33

hello d-artigo, i test all solutions, and always bip, so normally all good. maybe the problem is other? Because i see really nothing on the screen

d-Artigo · 04-15-2015, 11:35

Quote:

Originally Posted by gsmnas

hello d-artigo, i test all solutions, and always bip, so normally all good. maybe the problem is other? Because i see really nothing on the screen

samsung sm-g850f display ways
it means the problem is not of light ... but from his lcd .. try to check one by one its lcd connector pin
the second check its working voltage lcd
if still as before .. rehot or change his fifth emi filter or jumper lcd .... see picture below:

only press thank

gsmnas · 04-25-2015, 12:18

hello artigo,

i test all filter. bip sound continu for all, just one bip is not continu, bip every 2 or 3 second; you think jump only or change filter? because i don't have this filther in stock

sasikumararshad · 05-18-2015, 17:06

hello d-artigo . i need help i think i have broken my power chip on the g850f , please can you schematics for my g850f .. thanks

03-30-2015, 19:00	#1 (permalink)
gsmnas Freak Poster Join Date: Oct 2008 Location: france Posts: 106 Member: 879907 Status: Offline Thanks Meter: 9	Samsung alpha g850f no backlight. Phone clean no water damage. Hello guys, i have a samsung galaxy alpha no backlight. Phone is still working good because phone power on and i can use touchscreen (i hear the song) but i see nothing on the screen. motherboard is clean , no water, no parts broken or something. I think backlight ic or something not work. I need schematics or any help. (and of course i test new screen but not working...) Thanks

04-02-2015, 14:16	#3 (permalink)
gsmnas Freak Poster Join Date: Oct 2008 Location: france Posts: 106 Member: 879907 Status: Offline Thanks Meter: 9	Just tested reflow U900 but No result... We will try to check rest of solution and will inform you. And thanks

04-14-2015, 17:33	#4 (permalink)
gsmnas Freak Poster Join Date: Oct 2008 Location: france Posts: 106 Member: 879907 Status: Offline Thanks Meter: 9	hello d-artigo, i test all solutions, and always bip, so normally all good. maybe the problem is other? Because i see really nothing on the screen

04-25-2015, 12:18	#6 (permalink)
gsmnas Freak Poster Join Date: Oct 2008 Location: france Posts: 106 Member: 879907 Status: Offline Thanks Meter: 9	hello artigo, i test all filter. bip sound continu for all, just one bip is not continu, bip every 2 or 3 second; you think jump only or change filter? because i don't have this filther in stock

05-18-2015, 17:06	#7 (permalink)
sasikumararshad Insane Poster Join Date: Oct 2009 Posts: 90 Member: 1146335 Status: Offline Thanks Meter: 12	hello d-artigo . i need help i think i have broken my power chip on the g850f , please can you schematics for my g850f .. thanks