I've stripped the MB from the laptop and removed all accessories, so that just the main board is powered with the AC adapter only. I'm not getting the 20V to pass through the PQ304 MOSFET. Would like some help in what I should be looking for to help diagnose the issue.
What I have measured so far.
PQ301: verified Ok via diode mode test
pins 5-8 are 20.18V
pins 1-3 are 19.63V
Pin 4 is 19.63V
PQ304: verified ok via diode mode test
pins 1-3 are 19.63
pins 5-8 are 0V
pin 4 is 19.63V
PQ307:
pin 2 is 12.6V oscillating +- .1V
pin 1 is 14mV oscillating +- 40mV
PQ313:
pin 1 is 20mV oscillating
Pin 2 is 0V
PU301:
pin 5 is 5.4V
pin 6 is 2.6V
I've replaced PQ310, PQ305 and PQ307 and no change.
attached is schematic (sheet 39 of 51 is the AC in)
Any help would be appreciated
What I have measured so far.
PQ301: verified Ok via diode mode test
pins 5-8 are 20.18V
pins 1-3 are 19.63V
Pin 4 is 19.63V
PQ304: verified ok via diode mode test
pins 1-3 are 19.63
pins 5-8 are 0V
pin 4 is 19.63V
PQ307:
pin 2 is 12.6V oscillating +- .1V
pin 1 is 14mV oscillating +- 40mV
PQ313:
pin 1 is 20mV oscillating
Pin 2 is 0V
PU301:
pin 5 is 5.4V
pin 6 is 2.6V
I've replaced PQ310, PQ305 and PQ307 and no change.
attached is schematic (sheet 39 of 51 is the AC in)
Any help would be appreciated
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