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PREMIUM Samsung A12 (A125) No Display Light to No Power.. Fixed!!!

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activa2r

activa2r

Administrator
Staff member
Joined
Oct 30, 2022
Messages
714
una no display Light lng pinallitan ng cotech natin ng coil
nag no power na
kaya rescue mode..

visual check at voltage check..
una cathode side ng diode OL so no connection
second anode side dapat may 3.6v galing sa coil 0v din..

3.JPG

kaya palit coil at lcd light driver (LM36274) code.

ito yun

Capture.JPG



IMG_0565.JPG

nag vibrate na ma display wala pa rin light
voltage check uli anode side may 3.6v na pero cathode side 0.5v ouput lang
salang sa thermal
naisip ko inject 2.v sa fpc LED A conection (yellow arrow sa baba)
(2v enough na wag lang lumagpas sa 3.6 na vph pwr)
may namumula sa taas (red na arrow )

Capture2.JPG

open ko shield at nakita ko capasitor leak... :D :D :D :D
remove capasitor and done..

IMG_0566.JPG

IMG_0560.JPG

for reference uli mga idol ko...
 
activa2r said:
una no display Light lng pinallitan ng cotech natin ng coil
nag no power na
kaya rescue mode..

visual check at voltage check..
una cathode side ng diode OL so no connection
second anode side dapat may 3.6v galing sa coil 0v din..

View attachment 31087

kaya palit coil at lcd light driver (LM36274) code.

ito yun

View attachment 31089



View attachment 31088

nag vibrate na ma display wala pa rin light
voltage check uli anode side may 3.6v na pero cathode side 0.5v ouput lang
salang sa thermal
naisip ko inject 2.v sa fpc LED A conection (yellow arrow sa baba)
(2v enough na wag lang lumagpas sa 3.6 na vph pwr)
may namumula sa taas (red na arrow )

View attachment 31090

open ko shield at nakita ko capasitor leak... :D :D :D :D
remove capasitor and done..

View attachment 31091

View attachment 31092

for reference uli mga idol ko...
Click to expand...
apakalupet idol husay mag base sa reading ,,
 
activa2r said:
una no display Light lng pinallitan ng cotech natin ng coil
nag no power na
kaya rescue mode..

visual check at voltage check..
una cathode side ng diode OL so no connection
second anode side dapat may 3.6v galing sa coil 0v din..

View attachment 31087

kaya palit coil at lcd light driver (LM36274) code.

ito yun

View attachment 31089



View attachment 31088

nag vibrate na ma display wala pa rin light
voltage check uli anode side may 3.6v na pero cathode side 0.5v ouput lang
salang sa thermal
naisip ko inject 2.v sa fpc LED A conection (yellow arrow sa baba)
(2v enough na wag lang lumagpas sa 3.6 na vph pwr)
may namumula sa taas (red na arrow )

View attachment 31090

open ko shield at nakita ko capasitor leak... :D :D :D :D
remove capasitor and done..

View attachment 31091

View attachment 31092

for reference uli mga idol ko...
Click to expand...
galing boss
 
activa2r said:
una no display Light lng pinallitan ng cotech natin ng coil
nag no power na
kaya rescue mode..

visual check at voltage check..
una cathode side ng diode OL so no connection
second anode side dapat may 3.6v galing sa coil 0v din..

View attachment 31087

kaya palit coil at lcd light driver (LM36274) code.

ito yun

View attachment 31089



View attachment 31088

nag vibrate na ma display wala pa rin light
voltage check uli anode side may 3.6v na pero cathode side 0.5v ouput lang
salang sa thermal
naisip ko inject 2.v sa fpc LED A conection (yellow arrow sa baba)
(2v enough na wag lang lumagpas sa 3.6 na vph pwr)
may namumula sa taas (red na arrow )

View attachment 31090

open ko shield at nakita ko capasitor leak... :D :D :D :D
remove capasitor and done..

View attachment 31091

View attachment 31092

for reference uli mga idol ko...
Click to expand...
ang lupet talaga master.
 
kaya minsan dapat sundin ang step by step ang pag rerepair hindi bara bara at init ng init kasi inaanalize pa natin yan ang galing at ang linis..

kaya pag mga hardware na ayaw paiwan ng tomer at naitataon na madami gawa ayaw paiwan pass ako akala kasi nila madali alng minsan mag repair.
 
my tanggap ako ganito at ito ang sinubukan ko sundan at napag ilaw ko nga sya boss
same na issue,,nega sa new lcd kaya tinanggal ko ung dalawa na capasitor gumana at ung coil galing sa oppo A3S ok nman po
tnks po sa pagshare
 
activa2r said:
una no display Light lng pinallitan ng cotech natin ng coil
nag no power na
kaya rescue mode..

visual check at voltage check..
una cathode side ng diode OL so no connection
second anode side dapat may 3.6v galing sa coil 0v din..

View attachment 31087

kaya palit coil at lcd light driver (LM36274) code.

ito yun

View attachment 31089



View attachment 31088

nag vibrate na ma display wala pa rin light
voltage check uli anode side may 3.6v na pero cathode side 0.5v ouput lang
salang sa thermal
naisip ko inject 2.v sa fpc LED A conection (yellow arrow sa baba)
(2v enough na wag lang lumagpas sa 3.6 na vph pwr)
may namumula sa taas (red na arrow )

View attachment 31090

open ko shield at nakita ko capasitor leak... :D :D :D :D
remove capasitor and done..

View attachment 31091

View attachment 31092

for reference uli mga idol ko...
Click to expand...
Boss, itong sa akin completo lahat ng voltage sa line ng light, pati BL_EN signal meron din.
Bago na din light IC, coil at diode.
Wala pa rin display, nag vibrate lang.

Sa lines naman ng LCD meron dalawa ang walang boltahi. Itong VSN_-5P9 at VSP_5P9
Yang dalawang naka circle dyan ang walang boltahi.
Screenshot 2025-02-27 142155.png
 
fhulgzz said:
Boss, itong sa akin completo lahat ng voltage sa line ng light, pati BL_EN signal meron din.
Bago na din light IC, coil at diode.
Wala pa rin display, nag vibrate lang.

Sa lines naman ng LCD meron dalawa ang walang boltahi. Itong VSN_-5P9 at VSP_5P9
Yang dalawang naka circle dyan ang walang boltahi.
Click to expand...
kung sa baklight out meron 3.7v
sa display ka mag focus..
power on after vibrate wait ng ilang seconds connect sa pc kung detected as MTP.
pag detected display issue yan..
pag walang detect vibrate lang ang phone no power..

ilagay natin diode value ng fpc VSP and vsn booth normal..
then detected sa pc..
check signal from cpu to diplay/light driver
this 3 pads..

Capture.PNG
 
fhulgzz said:
Boss, itong sa akin completo lahat ng voltage sa line ng light, pati BL_EN signal meron din.
Bago na din light IC, coil at diode.
Wala pa rin display, nag vibrate lang.

Sa lines naman ng LCD meron dalawa ang walang boltahi. Itong VSN_-5P9 at VSP_5P9
Yang dalawang naka circle dyan ang walang boltahi.
View attachment 38251
Click to expand...

a125f a12 no display check this.jpg
paki tsek mo rin linya boss papunta power ic minsan napuputol minsan nag iiba resistance nya..display related sya nagawa ko dati napuputol supply sa vdd_lcd_1p8
 
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