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REFERENCE Samsung a127f aka galaxy A12 no Power

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FredzyNoy

Premium Account
Joined
Apr 9, 2018
Messages
1,763
unit : a127f aka galaxy a12
problem : no power
diagnose first kung shorted
normal naman sa batt fpc. walang short.
try ko remove metal shield sa backlight section.. nag iba na kulay ng capacitor at pag tester ko short to ground.. remove ko at nawala short. pero ayaw parin magpower ayaw din magcharge. wala response sa schematic charger.. try ko sa power supply pero mababa current nya.
IMG_20250103_184408.jpg
try ko naman reball power ic
1000006218.jpg
pero ala nagbago.. mababa parin current.
final na.. angat ko na cpu at ireball.
quick2008 hotair gamit ko
settings ng heat at air
degumming or pagremove ng sealed sa palibot ng cpu
heat 260
air 35
next lifting cpu eto set ko
400 heat
65 air
pakiramdaman cpu at sundot sundot
pag may kumukulo na at may tingga nalabas malambot na pede na iangat.
1000006220.jpg
ok lang may matanggal pads kadalasan ground at no connection. meron din tatlo koneksyon na pads na open pattern oks lang din dahil may borneo naman makita parin tinakbuhan na linya kaya gawa nalang ng linya. niready ko lang o nilagyan ko abang para after lapag cpu eh pede ko na madugtong mga linya
after malinis cpu lapag na ulet.
heat 370
air 20..pag kumapit na cpu sa board adjust ko na air ng 40 at alog alog konti sa gilid ng cpu habang hinahot air.. at presto na for testing.. success!
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