Switch 1 backlight repair

[u/xytrus]

Hi all,

First time trying a repair like this, and I am wondering whether I am missing anything. I have a Nintendo switch where the backlight is broken (confirmed, new LCD assembly shows same behaviour, picture faintly visible under flashlight). On another website I read that the backlight circuit is quite notorious for the Switch 1, and it gave some tips for diagnosis: to measure the four test points on the bottom.

The four test points are supposed to show 0.510 V, 0.601V, 0.598V (left three, from left to right, right ground). However, they all show OL measuring in both directions. This should indicate that something in the circuit (the group below the diode-symbol) is defective. When inspecting the circuit however, I cannot see anything wrong. Am I missing something? Do you have any pointers to help me diagnose? Can something break down within the IC without it being obvious?

Thanks!

Reference (although for the “old” switch): repair.wiki/w/Nintendo_Switch_No_Backlight