noob here, I followed a few threads for the 1742, 1741 and 1740, and instead of grafting onto existing ones here is the quest :
The unit is clean, it was given by a neighbor after he said that the trace disappeared one day.
Tested the LVPS, board A16 and the only off number is TP6 at 4.78v instead of 120v. After discussing with a more knowledgeable tech, I replaced Q1, then Q2 with no changes. Our consensus is that the power transistor could be off... no way to test it at the moment... and may be somebody could give us some ideas may be a refnum for that power transistor
test schem and pict of transistor, the Ti one on the left side
Thank you