On Mon, Mar 31, 2025 at 05:10 AM, Azgael wrote:
there seams to be a broken via or track connecting source of q102 to ic101 to input.
Azgael,
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Your fix is not quite what you think.
You did indeed connect the Source of Q102 o the input of IC101.?
But the schematic connects the Drain of Q102 to IC101 input.
What you did is bypass the Q102 switch, enabling your QMX to power up.?
This bypassed the fault - which is either a fault in Q102 or Q101 or the signal at LIN_REG_EN, as previously discussed.
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So there likely is no broken trace on your board, just a misunderstanding of source/drain connection on the schematic.? And you have nothing to worry about additional board defects (these boards are tested, so as Ludwig noted, we would be very surprised if any trace was bad).
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Your QMX+ will work fine this way, but will have the linear regulator on all the time, which consumes an extra few 10s of milliamps, so if you are operating on batteries they will not last quite as long.? The diode D103 allows both supplies to be on with no damage.
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Stan KC7XE
