On Tue, Apr 1, 2025 at 04:05 PM, Azgael wrote:
The Voltage at the Drain Q101 (Gate Q102) is 9.7v, the voltage at Gate Q101 is 2.6v,
Hello Azgael, 9.7 V is wrong for this gate voltage. It looks like Q101 is broken.
the voltage at Source Q102 is nearly 12v and at Drain Q102 is 0V (With 2.3v difference Source to Gate I was excepting to have approximately 12V).
Yes, it's also wrong. It looks like Q102 is also not ok.
If you remove Q101 use the chance to measure voltage at LIN_REG_EN. The voltage should be near "+12V" for your Rev. 2 QMX+. (For some Rev. of QMX the voltage is only 50% of "+12V". For some Rev. a voltage devider is used and for some not. Check schematics for your Rev. to find the right value.)
?
73 Ludwig
