Chosen Solution
Hi, Iphone 6 connected to power supplay 4V will boot until 0.07a - 0.09a and LOOP. LCD Blank , Not in Recovery or DFU Mode . Tested Tristar before and after replace 1V8 - 3V0 - 5V0 Lines Ok. Tested Tigris 3V0 and 5V0 Lines Ok No Short on VCC Line PCB Not Heat No water damaged. Due Low power amp Loop i suspect to 1V8 SDRAM. Start to Test all 1V8 lines and i fund 0V at line PP1V8_OSCAR. IC - U2203 c2247 and c2248-1 instead of PP1V8_OSCAR has 0V. IC - U2205 c2270-2 instead of PP1V8_OSCAR has 0V. IC - U2205 c2272 instead of PP3V0_IMU has 0V. From where PP1V8_OSCAR is taking power ? While Tristar and Tigris 1.8 are OK Any Help will be highly appreciated thanks In Advance
PP1V8_OSCAR is generated directly by the PMIC. If it is shorted (check it in diode mode as well), then you either remove the PMIC or remove U2201/U2203/U2204 to see where the short is coming from.
U2205 and U1901 seem to be the 2 things in common on those 2 missing power lines…. Accelerometer and Compass IC… Not sure if they effect boot… but could always remove U2205 and check voltages under it first and then move to 1901 to test for voltages under it.
Hi. Could you solve the damage? I have one the same is in 0.70ma does not have voltages in oscar
