Hi guys, have a 2011 15 inch here with not yet failed radeon. All ooks clean, no visible damage. It only boots with battery attached. First I had no green light and measured weird voltages at u6900 / u6901. When I returned a day later bc acok and 1 wire seemed fine and had green light but still no fan spin. If I attach the batteryafter magsafe it immediatel boots. Yes, real 85w original charger 
Should I go through the initial power rails on magsafe only ? I was thinking of just replacing the ISL but then I thought: no guessing, understand the problem right first. The current sensing in and out resistors are good as r6990 and f6905 are. My brain is so out of routine. I did not really work for almost 2 years of sicknes. I thought I ask for a hint here before I go on getting my slow brain back into logical thinking haha. best regards
Should I go through the initial power rails on magsafe only ? I was thinking of just replacing the ISL but then I thought: no guessing, understand the problem right first. The current sensing in and out resistors are good as r6990 and f6905 are. My brain is so out of routine. I did not really work for almost 2 years of sicknes. I thought I ask for a hint here before I go on getting my slow brain back into logical thinking haha. best regards
