MI Note 4 Display Back Light Solution - GSM-Forum

deep_6111 · 11-25-2017, 14:32

MI Note 4 Display Back Light Solution
MI Note 4 Light sollution.jpg

sharwan verma · 11-28-2017, 08:18

Quote:

Originally Posted by deep_6111

MI Note 4 Display Back Light Solution
Attachment 362207

change lite ic 100% done

deep_6111 · 11-30-2017, 06:40

But there is no light ic in it.

odemontealto · 12-11-2017, 10:16

Quote:

Originally Posted by deep_6111 View Post
MI Note 4 Display Back Light Solution
Attachment 362207

Hi!
I have the same problem in two redmi 4. The coils are open but the diodes are apparently ok.

What is the value of coils and diodes? I don´t have schematic.

Thank you

mukeshre · 12-30-2017, 12:18

i have change light driver and diod but no respond

MC_Cloud · 01-12-2018, 11:40

Quote:

Originally Posted by mukeshre

i have change light driver and diod but no respond

try change the coil,works for me

javaid ganie · 01-27-2018, 07:46

I change light ic (power ic near it coil & diod)but no boost voltage found plz if sol help me

timbul · 02-05-2018, 12:32

Where lite ic potition

D saakib elec · 02-08-2018, 19:48

Note its not only light ic... Its small power ic too. Phone cant bootup without it

PRESS THANKS BUTTON ONLY

cresstt · 02-11-2018, 06:54

is this problem with the LCD backlight not coming up after waking up ?

if so, I have 2 types of xiaomi redmi note 4 ; 1 is using MTK cpu and the other is snapdragon qualcomm,

this problem only affects xiaomi redmi note 4 with qualcomm cpu.

can somebody share the capacitor and coil values ?

tq

cresstt · 02-11-2018, 17:11

Quote:

Originally Posted by odemontealto

Hi!
I have the same problem in two redmi 4. The coils are open but the diodes are apparently ok.

What is the value of coils and diodes? I don´t have schematic.

Thank you

I downloaded schematics from this thread. The note4 schematics is not exactly the same, but from the schematics page, on u201(PMI8952)

diode is WSB5507W-2
and
inductor coil is 10uH

pradeepjaiswal · 02-28-2018, 08:09

Mi note 4 water damage restart's any solution

javaid ganie · 03-02-2018, 04:03

My prob is solve after long period 30 days i lastly found due to supply is brack in power ic to diod not to easy but hard work i find supply through magnify glass

deep_6111 · 03-03-2018, 05:50

Good job javaid can you plz share the solution.

ssajjad · 04-10-2018, 17:03

Quote:

Originally Posted by javaid ganie

My prob is solve after long period 30 days i lastly found due to supply is brack in power ic to diod not to easy but hard work i find supply through magnify glass

how you solve this problem.
i also have a mi note 4 water damaged... problem is no lcd light.....

please reply sajjad 7006211200

11-25-2017, 14:32	#1 (permalink)
deep_6111 Registered User Join Date: Dec 2007 Location: Chandigarh Posts: 343 Member: 655438 Status: Offline Thanks Meter: 146	MI Note 4 Display Back Light Solution MI Note 4 Display Back Light Solution MI Note 4 Light sollution.jpg

02-08-2018, 19:48	#9 (permalink)
D saakib elec Freak Poster Join Date: Jun 2013 Location: Jammu and Kashmir Baramulla Posts: 463 Member: 1963898 Status: Offline Thanks Meter: 52	Here are the location of redmi note4 light ic Note its not only light ic... Its small power ic too. Phone cant bootup without it PRESS THANKS BUTTON ONLY

11-30-2017, 06:40	#3 (permalink)
deep_6111 Registered User Join Date: Dec 2007 Location: Chandigarh Posts: 343 Member: 655438 Status: Offline Thanks Meter: 146	But there is no light ic in it.

12-30-2017, 12:18	#5 (permalink)
mukeshre Insane Poster Join Date: Dec 2006 Posts: 84 Member: 409671 Status: Offline Thanks Meter: 14	i have change light driver and diod but no respond

01-27-2018, 07:46	#7 (permalink)
javaid ganie Junior Member Join Date: Jan 2017 Posts: 12 Member: 2673667 Status: Offline Thanks Meter: 2	I change light ic (power ic near it coil & diod)but no boost voltage found plz if sol help me

02-05-2018, 12:32	#8 (permalink)
timbul Junior Member Join Date: Feb 2010 Posts: 1 Member: 1225278 Status: Offline Thanks Meter: 1	Where lite ic potition

02-11-2018, 06:54	#10 (permalink)
cresstt Junior Member Join Date: Feb 2018 Posts: 2 Member: 2810066 Status: Offline Thanks Meter: 4	is this problem with the LCD backlight not coming up after waking up ? if so, I have 2 types of xiaomi redmi note 4 ; 1 is using MTK cpu and the other is snapdragon qualcomm, this problem only affects xiaomi redmi note 4 with qualcomm cpu. can somebody share the capacitor and coil values ? tq

02-28-2018, 08:09	#12 (permalink)
pradeepjaiswal Junior Member Join Date: Jan 2012 Posts: 8 Member: 1713651 Status: Offline Thanks Meter: 0	Mi note 4 water damage restart's any solution

03-02-2018, 04:03	#13 (permalink)
javaid ganie Junior Member Join Date: Jan 2017 Posts: 12 Member: 2673667 Status: Offline Thanks Meter: 2	My prob is solve after long period 30 days i lastly found due to supply is brack in power ic to diod not to easy but hard work i find supply through magnify glass

03-03-2018, 05:50	#14 (permalink)
deep_6111 Registered User Join Date: Dec 2007 Location: Chandigarh Posts: 343 Member: 655438 Status: Offline Thanks Meter: 146	Good job javaid can you plz share the solution.