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REFERENCE Iphone xs no power (DONE)

apol debays

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Jul 7, 2019
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Location
Bahrain
DEVICE: iphone xs
HISTORY: nasagasaan ng sasakyan durog ang lcd at backglass
TROUBLE: no power
DEFECTIVE PARTS: U3300 (charging ic)
SOLUTION: replace


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troubleshooting procedure:
1. connect sa RPS at power on then observe ang current, in my case ay walang response ang current, it means di natratrabaho ang power section.
2. separate core (upper board) and RF board(lower board)
3. sukatin ang boltahe sa C3352 positive side, ito ay ang vbatt voltage mula sa baterya, normal voltage ay 3.7 to 4v depende sa charge ng batt. kung mormal ang sukat nya ay dumako na sa no. 4.
4. Sukatin ang boltahe sa C3391 positive side, ito ay ang vdd voltage na supply para sa mga destination ic nya, normal is 4v to 5v, in my case ay walang vdd voltage kaya check ko kung shorted ang vdd line subalit wala naman shorted sa line kaya decide na ako na palitan ang u3300.

likes lang po kung nagustuhan nyo ang share, maraming salamat...
 
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