Chosen Solution
Hi all just have a iphone 6s here which had a short between VCC_Main and 1V8SDRAM. So there went VCC_Main Voltage into PP1V8SDRAM Line, VCC_Main had a constant 100mA current, which was caused by this. Guess the CPU is probably Toast but how can i check to make sure ? Phone goes into DFU and flash error 2009. Cheers
Are you saying that the measured voltage on the PP1V8_SDRAM line is ~3.7 - 4.2V? PP1V8_SDRAM is generated by the PMIC and the only way you can measure that kind of voltage is if the VCC_MAIN line is bridged to the SDRAM line or if the PMIC is defective. What happened to the phone or is this issue following a micro-soldering repair? If this came about after someone attempting a board level repair, then double check the work and look for solder bridges or parts that have shifted out of place. If any IC’s were reflowed and reballed, then remove those IC’s and check the pad grid or try a new IC.
