samsung sm-t355 back light issue - GSM-Forum

GSM MOBILES · 01-30-2018, 23:08

hello team
i have problem here
this Samsung sm-t355 back light not working please can anyone help me
to solve my problem
thanks

d-Artigo · 01-31-2018, 02:39

Quote:

Originally Posted by GSM MOBILES

hello team
i have problem here
this Samsung sm-t355 back light not working please can anyone help me
to solve my problem
thanks

samsung sm-T355 display light
first check the D6000 and L6001
if either ..rehot or replace ic light U6004

GSM MOBILES · 01-31-2018, 02:47

Quote:

Originally Posted by d-Artigo

samsung sm-T355 display light
first check the D6000 and L6001
if either ..rehot or replace ic light U6004

Yes I have checked the d6000 and l6001
That’s good
But Dk you know the jumper for backlight issue for this model

Sent from my iPhone using Tapatalk

d-Artigo · 01-31-2018, 04:25

Quote:

Originally Posted by GSM MOBILES

Yes I have checked the d6000 and l6001
That’s good
But Dk you know the jumper for backlight issue for this model

Sent from my iPhone using Tapatalk

for jumper I have not done it ... more clearly see the light ic data SKY82896 below

GSM MOBILES · 01-31-2018, 08:31

Quote:

Originally Posted by d-Artigo

for jumper I have not done it ... more clearly see the light ic data SKY82896 below

To be honest with you
I can’t figure this out
Reading voltage and you explain in more in photo and mark with point
This will be a great help
Thanks

Sent from my iPhone using Tapatalk

Mekabiz1 · 02-05-2018, 08:10

Thank you so much bro!!

sergsol · 06-20-2019, 14:09

Hello dear friends!

I also have same tablet T355 with same trouble (no image, no power up, heating up below led driver cover.
As I check: burn out inductor L6001 and diode D6000 - looks like similar.

But I can't find any information about diode and inductor model&size anywhere!!!

In SKY82896 datasheet (IC driver for led backlight) I found a reference schematic for typical application, and again - no info about used parts

I even found a service manual (I can provide it if needed) with full schematic of tablet, but again (bad luck!) no parts.

Please help me!

jm_rg94 · 06-20-2019, 14:55

Quote:

Originally Posted by sergsol

Hello dear friends!

I also have same tablet T355 with same trouble (no image, no power up, heating up below led driver cover.
As I check: burn out inductor L6001 and diode D6000 - looks like similar.

But I can't find any information about diode and inductor model&size anywhere!!!

In SKY82896 datasheet (IC driver for led backlight) I found a reference schematic for typical application, and again - no info about used parts

I even found a service manual (I can provide it if needed) with full schematic of tablet, but again (bad luck!) no parts.

Please help me!

From samsung t355 parts list:

* 2703-003897 L6001 INDUCTOR-SMD
check this page for same parts in other phones/tablets
Samsung Spare Parts | Mobile Phone | Feature Phone | GT-B3800FKTXSA | Version 0004 | SAMSUNG INDUCTOR-SMD

* 0404-001669 D6000 DIODE-SCHOTTKY
check this page for same parts in other phones/tablets
Samsung Spare Parts | Camera | NX Camera | EV-NX3000BOHAU | Version 0000 | SAMSUNG DIODE-SCHOTTKY

* 1203-008519 U6004 IC-BACKLIGHT DRIVER
check this page for same parts in other phones/tablets
It seems that there are some more models that have this IC but it's
not clear.
Samsung Spare Parts | Mobile Phone | Tablet | SM-P350NZAAXSA | Version 0001 | SAMSUNG IC-BACKLIGHT DRIVER

Hope it helps a little

sergsol · 06-21-2019, 12:19

Quote:

Originally Posted by jm_rg94

From samsung t355 parts list:

Hope it helps a little

Many thanks! Part numbers that you provide give me more ways to find parts!

sergsol · 06-22-2019, 21:19

Hello dear friends!
Many thanks again to jm_rg94, information that he provide to me was very useful

Knowing L6001 INDUCTOR-SMD real value, I made a temporary checking (using bigger parts soldering with wires) of display light: inductor was burn out (clearly seen by eyes!), diode was good (my mistake).

And after inductor temporary replace (4.7 µH needed) I found a bad capacitor C6031 (inside a metal shield).

For test I replace this capacitor with external 2200nf 50V capacitor - display light going up, and a tablet was return to life and begin to charge!

Can you provide me a part number of C6031 capacitor?
May be a good idea to find real size and value of this part.

jm_rg94 · 06-22-2019, 21:32

Quote:

Originally Posted by sergsol

Hello dear friends!
Many thanks again to jm_rg94, information that he provide to me was very useful

Knowing L6001 INDUCTOR-SMD real value, I made a temporary checking (using bigger parts soldering with wires) of display light: inductor was burn out (clearly seen by eyes!), diode was good (my mistake).

And after inductor temporary replace (4.7 µH needed) I found a bad capacitor C6031 (inside a metal shield).

For test I replace this capacitor with external 2200nf 50V capacitor - display light going up, and a tablet was return to life and begin to charge!

Can you provide me a part number of C6031 capacitor?
May be a good idea to find real size and value of this part.

efrcom · 06-26-2019, 10:51

C6031=umk316abj475kd
L6001=1239as-h-4r7n

sergsol · 07-22-2019, 12:26

Hello guys!
Many thanks to efrcom for non-original part numbers - they much cheaper and more available in stores.

As a result of the repair - broken parts was changed in this way.
smd-inductor L6001 (p/n samsung 2703-003897) was changed to Murata p/n 1239AS-H-4R7M=P2 (4.7 µH, 30%, size 1008 [metric size 2520!], 1MHz)
smd-capacitor C6031 (p/n samsung 2203-007790) was changed to Murata p/n GRM31CR71H475KA12L (4700NF,10%,50V,X5R,TP,size 3216 [metric size 1206!]

Please note - Murata parts are a little higher than original parts (0.5mm).
But they can short to a metal shielding cap then closing it - put a thin strip of Scotch clear tape (packing tape) to inside of cap.

Tablet will light up and working good!

01-30-2018, 23:08	#1 (permalink)
GSM MOBILES No Life Poster Join Date: Jul 2011 Location: new zealand Posts: 565 Member: 1624770 Status: Offline Sonork: 1640429 Thanks Meter: 98	samsung sm-t355 back light issue hello team i have problem here this Samsung sm-t355 back light not working please can anyone help me to solve my problem thanks

02-05-2018, 08:10	#6 (permalink)
Mekabiz1 Junior Member Join Date: Feb 2018 Posts: 9 Member: 2806613 Status: Offline Thanks Meter: 0	Thank you so much bro!!

06-20-2019, 14:09	#7 (permalink)
sergsol Junior Member Join Date: Jun 2019 Location: California Posts: 4 Member: 2914524 Status: Offline Thanks Meter: 1	Hello dear friends! I also have same tablet T355 with same trouble (no image, no power up, heating up below led driver cover. As I check: burn out inductor L6001 and diode D6000 - looks like similar. But I can't find any information about diode and inductor model&size anywhere!!! In SKY82896 datasheet (IC driver for led backlight) I found a reference schematic for typical application, and again - no info about used parts I even found a service manual (I can provide it if needed) with full schematic of tablet, but again (bad luck!) no parts. Please help me!

06-22-2019, 21:19	#10 (permalink)
sergsol Junior Member Join Date: Jun 2019 Location: California Posts: 4 Member: 2914524 Status: Offline Thanks Meter: 1	Hello dear friends! Many thanks again to jm_rg94, information that he provide to me was very useful Knowing L6001 INDUCTOR-SMD real value, I made a temporary checking (using bigger parts soldering with wires) of display light: inductor was burn out (clearly seen by eyes!), diode was good (my mistake). And after inductor temporary replace (4.7 µH needed) I found a bad capacitor C6031 (inside a metal shield). For test I replace this capacitor with external 2200nf 50V capacitor - display light going up, and a tablet was return to life and begin to charge! Can you provide me a part number of C6031 capacitor? May be a good idea to find real size and value of this part.

06-26-2019, 10:51	#12 (permalink)
efrcom No Life Poster Join Date: Mar 2005 Location: Turkey Bursa Age: 63 Posts: 1,069 Member: 128481 Status: Offline Thanks Meter: 376	C6031=umk316abj475kd L6001=1239as-h-4r7n

07-22-2019, 12:26	#13 (permalink)
sergsol Junior Member Join Date: Jun 2019 Location: California Posts: 4 Member: 2914524 Status: Offline Thanks Meter: 1	Hello guys! Many thanks to efrcom for non-original part numbers - they much cheaper and more available in stores. As a result of the repair - broken parts was changed in this way. smd-inductor L6001 (p/n samsung 2703-003897) was changed to Murata p/n 1239AS-H-4R7M=P2 (4.7 µH, 30%, size 1008 [metric size 2520!], 1MHz) smd-capacitor C6031 (p/n samsung 2203-007790) was changed to Murata p/n GRM31CR71H475KA12L (4700NF,10%,50V,X5R,TP,size 3216 [metric size 1206!] Please note - Murata parts are a little higher than original parts (0.5mm). But they can short to a metal shielding cap then closing it - put a thin strip of Scotch clear tape (packing tape) to inside of cap. Tablet will light up and working good!