Power LED does not light up on some boards

[wolframalexa]

Problem
On some boards, the power LED D6 does not light, even though the board completes its power-on sequence and has booted normally.

Release
A00, no modifications

Observed Behavior

• The LED is the correct direction
• The board completes its power on sequence and the software functions as expected
• GPIO04 remains LOW at 0.6V, even though it should be driven HIGH upon power-up
• There is no measured voltage drop across R32
• There is an insufficient voltage drop across D6

Root Cause Theory
The gate threshold voltage varies depending on the individual transistor. It could be that this transistor has a higher V_GS and does not turn on when GPIO04 is at 0.6V. Additionally, the transistor Q7 could be misaligned.

Suggested Next Steps

• Investigate behavior of GPIO04, which should be HIGH upon power-on. Remove R31 to ensure no loading effects from transistor.
• Change all transistors DMN26D0UFB4-7 to the DMN26D0UT-7, which is in a larger SOT-523 package, to avoid misalignments.

[wolframalexa]

Added external 10k pullup R89 to 1v8 between R31 and gate of Q7. Also switching transistor footprint.