The 5v switch for the Sim 5v pin 1 is feed from the Q8 center pin, the drain side.
Check if the print track from the Q8 to the sim card holder is still intact.

Next step is to measure the Q8, or to replace.
That is, if the Q9 is working well, otherwise the Q8 will not be switched.

I think check the values according my measurements at Ohm and diode measurements.

See the image,
Howto check the simcard circuit (Ohm measurement).
Howto check the Q8 (Diode measurement).
Here, Dm800hd simcard issues.
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Doing nothing leads to nothing.

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Will be given here, or on the jb8a8f8 forum and I prefer it in English.
Johnny B.

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