OSSC 1.6 and I did the thing. External HDD power supply and ossc power mixup so it got hit with 12V 1A while unit was switched off.
I have read about five other threads and I just wanted to confirm steps I gathered from them before starting repair (sanity check).
All below tests were done without power supply connected.
Power switch off or on, I see continuity between middle pin of power barrel connector and one side of F1 but not other, nor D5 or C107. So replace fuse.
Power switch off, I have continuity between ground to 1 side of D5 and C107. Replace the diode and then test C107 again to see if that goes away?
Power switch off and All pins of U5, U6, U7, U12-16 show short to ground, replace U5 and then test U6, U7, U12-16 again. Replace as necessary.
I am using a regular iron rather then hot air, I was thinking of just taking off the LCD display while I take care of U5 to prevent accidents, good idea/bad idea?
Once all fried U# parts and fuse/diode/cap are testing good, put LCD back on and power up. Look for damage to U3 if LCD reports init error -4 and no good HDMI output.
Is that a pretty good summary of things to check/steps to take and order of repair/testing?