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REFERENCE Redmi Note 9 Bootloop problem Fix.

Lordzins_12

Premium 2024
Joined
Dec 21, 2022
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Location
Midsayap,. North Cotabato
Scene: Dinala ni kustumer nag bobootloop. Observe nyo mabuti to lalabas ang logo at agad agad mamatay then paulit ulit.

Action taken: hang ang mainboard, check ang switch, jump Resistor Fuse sa battery, palit new Battery. No Luck po. Try ko e reset no luck pa rin.. kaya nag deside ako baka cpu/emmc na. Pero bago yun nag DIODE MODE ako at chinek ang lahat ng caps sa gilid ng cpu at emmc sa tulong ng borneo. Normal naman po lahat. Sinubukan ko din sa mga gilid ng Pmic. At may napansin ako na kaaiba .

17090190954252110601367164980824.jpg

yung kulay green lang na linya ang sundan.
High value po kasi sya sa diode mode nasa (0.021) samantala sa normal nya ay papalo (0.426) gamit kung Multi-tester ay Bside S11 .
Ibig sabihin papunta na sya shorted.
Ang ginawa ko ginamitan ko ng thermal cam at inject voltage 4.2v at 2amp. 17090200329142706903079884918019.jpg
3g P.A section yan. May malaking caps dyan.yan yung unang uminit . . Tinanggal ko pang at yun bumalik sa normal.
17090202442108263483390980344549.jpg
BUhay ang unit
 
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