Keyboard section is not charging
I have a Microsoft Surface Book I (1703). The main battery in the keyboard section (1704) is not charging. Both batteries won’t charge if the two sections are together. Display section will charge on its own. Keyboard section will not charge on its own. Keyboard and trackpad work fine. Charging connector light will not come on when plugged into the keyboard section. No pins are bent/broken on charging port. Tried cleaning pins. Took off the bottom cover and reseated cables. Found that when main battery is disconnected (internally in keyboard section), the power adapter light will flash, when connected. Does this mean main battery is at fault? Not sure if video board in keyboard section has some smarts or just provides pass-thru for power, keyboard and trackpad. Any resets I could try?