Iphone 6 very hot 120amps

[abukuru]

Hello .....iphone 6 cannot power on..so i connect with power supply without power button press. It reads 120amps very hot.i taught i was wifi chips so i check c5202rf .. no short..i check all caps connected to vcc main all good , and i remove A8 shield and it was hot there all caps close to display ic good but the L1503 was so hot that it burn my hand so guys how can this L1503 been hot and all caps good should i remove it and replace or is there any other place that i still need to check to aboid further damages pls


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[zarbourne]

L1503 marries VCC_MAIN and PP_WLED_LX which goes to D1501 and U1501

- Check how much voltage is on VCC_MAIN
- Check for short on C1505 OR C1531 OR C1530 (PP_LCD_BL_ANODE) to ground

I think you have short on backlight circuit

[abukuru]

Originally Posted by zarbourne

L1503 marries VCC_MAIN and PP_WLED_LX which goes to D1501 and U1501

- Check how much voltage is on VCC_MAIN
- Check for short on C1505 OR C1531 OR C1530 (PP_LCD_BL_ANODE) to ground

I think you have short on backlight circuit

This three caps have no shot?????


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[vinse]

Originally Posted by abukuru

Hello .....iphone 6 cannot power on..so i connect with power supply without power button press. It reads 120amps very hot.i taught i was wifi chips so i check c5202rf .. no short..i check all caps connected to vcc main all good , and i remove A8 shield and it was hot there all caps close to display ic good but the L1503 was so hot that it burn my hand so guys how can this L1503 been hot and all caps good should i remove it and replace or is there any other place that i still need to check to aboid further damages pls


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L1503 can't be shorted cause not directly connected to ground
so this short is through some arround
questions :
are you sure that's is L1503 wiche is hot or U1502 (this is related to GND)
have checked the other side of this board maybe something else is hot
check C1263 and C1200

[abukuru]

Originally Posted by vinse

L1503 can't be shorted cause not directly connected to ground
so this short is through some arround
questions :
are you sure that's is L1503 wiche is hot or U1502 (this is related to GND)
have checked the other side of this board maybe something else is hot
check C1263 and C1200

So u mean L1503 cannot be shot because its Gnd U1502 is hot also but not as L1504


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[vinse]

Originally Posted by abukuru

So u mean L1503 cannot be shot because its Gnd U1502 is hot also but not as L1504


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the only way to L1503 to be shorted is through something or some one welded her to much and on pads goes to gnd
so the caps can be short, the ic can be short ,but the coil can't directly shorted
see your schematic you will figure it out
so if L1503 is hot and the amperage is so hight that's meen VCC_main short
check both side of the board

question what is the diode mode value on TP2520 ?? it had to be around 500 mv
check this

[abukuru]

Ok sir will check this


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