Ethanol used instead of thermal cam with 0.7V on PPBUS_G3H, resistance between PPBUS_G3H and CPU coil is 22Ohm)Ģ68mA current draw, visual inspection reveals cracked tantalum capacitor was causing the short. If PPBUS_G3H to CPU/GPU vcore coils is not under 1 ohm, the short is elsewhere, inject 1v and use thermal camera to help you find the short.Įxample of bad capacitor: (Taking 0.2A. On this board this situation is always a no fix, since 12v fried the CPU. Measure PPBUS_G3H to vCORE coils (coils around CPU/GPU) IF those measure UNDER 1Ohm (0.3-0.8) then you most likely have a direct 12V short to CPU/GPU. Best to repair the corroded area(s) before connecting the machine to a power source. If there is corrosion in the U7200 area it is not a good idea to connect the charger because there is a chance that it will send 12V to the CPU and kill it (or the CPU is dead already). DO NOT use FDMF 6808 chips from a donor board. The failing CPU MOSFETs can be replaced with FDMF 6708 or FDMF 3030 chips. Kernel panics with failing CPU MOSFETs are very uncommon, and suggestive of another problem. With failing CPU MOSFETs, people will report a black screen followed by a restart or shutdown. This has been confirmed with x-ray inspection. On late 2013 through 2015 devices, the issue is likely failing CPU MOSFETs.
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