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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Xiaomi > Xiaomi Hardware Repair

Xiaomi Hardware Repair General Xiaomi phones discussion, firmwares, solution, help

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Old 11-25-2017, 13:32   #1 (permalink)
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Talking MI Note 4 Display Back Light Solution


MI Note 4 Display Back Light Solution
MI Note 4 Light sollution.jpg
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Old 11-28-2017, 07:18   #2 (permalink)
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Originally Posted by deep_6111 View Post
MI Note 4 Display Back Light Solution
Attachment 362207
change lite ic 100% done
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Old 11-30-2017, 05:40   #3 (permalink)
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But there is no light ic in it.
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Old 12-11-2017, 09:16   #4 (permalink)
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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 donīt have schematic.

Thank you
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Old 12-30-2017, 11:18   #5 (permalink)
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i have change light driver and diod but no respond
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Old 01-12-2018, 10:40   #6 (permalink)
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i have change light driver and diod but no respond
try change the coil,works for me
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Old 01-27-2018, 06:46   #7 (permalink)
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I change light ic (power ic near it coil & diod)but no boost voltage found plz if sol help me
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Old 02-05-2018, 11:32   #8 (permalink)
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Where lite ic potition
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Old 02-08-2018, 18:48   #9 (permalink)
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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



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Old 02-11-2018, 05:54   #10 (permalink)
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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
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Old 02-11-2018, 16:11   #11 (permalink)
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Originally Posted by odemontealto View Post
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 donīt 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
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Old 02-28-2018, 07:09   #12 (permalink)
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Mi note 4 water damage restart's any solution
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Old 03-02-2018, 03:03   #13 (permalink)
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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
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Old 03-03-2018, 04:50   #14 (permalink)
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Good job javaid can you plz share the solution.
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Old 04-10-2018, 17:03   #15 (permalink)
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dear javeed

Quote:
Originally Posted by javaid ganie View Post
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
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