Lenovo A766 No Power Done By Hardware

scarface

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Lenovo A766 No Power Done By Hardware






History:
Natapunan daw ng Juice pero gumana pa, after 2 weeks bigla na lang daw nag no Power

Action Taken:
1. Test using tester, No Shorted in circuits
2. Test the Battery May laman
3. Check sa Power Supply , Result is 0.06 Ampher lang ang reading
4. try kung nag connect sa PC but USB not Recognized
5. Disassemble the Phone and Analyze ng konti, napansin ko parang may madumi sa PMIC pero parang di dun kasi malinis linis pa naman
6. Isip isip........ check ko muna sa connection ng VBAT, pag sa power supply may nakakabit yung PCB board, may Voltage output sa Vbat, pero pag sa USB nakasaksak ang PCB board, supposedtedly dapat may Voltage ouput din....
7. so walang VBAT at ibang voltage reference pag sa USB nakasaksak, at USB not recognized, then check the USB socket may 5V naman means buo ang USB socket
8. Focus ako sa Power Management IC
9. Cleanout muna ang surface na Pinaghihinalaan
10.Then Reflow ko po ang PMIC
11. check ko po ang PCB sa Power Supply, aba sumipa ang reading from 0.07 amphere to 0.34 amphere, then check ko sa USB Socket, may Voltage output na makikita yung reference output voltage sa screenshot sa baba
12. Na Excite ako kaya kinabit ko agad sa LCD at BOOM ngumiti na so Phone
13. Observe ok na si phone, Charging, USB connection, Power, Camera, Sounds and mic
14 DONE

Screenshot of PCB boarrd for reference:



Eto po ang Result:



Salamat po sa pag view nito sana maka tulong ito :D

GOD bless.....
 
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