I am trying to fix the charging circuit on this laptop. Windows says it is charging but the charging icon stays at 0%. There is plenty on google about this and one user replaced PQ1 and fixed it. I am looking at doing the same but I can't tell if PQ1 or PQ2 is bad. They are N channel mosfets Fairchild FDS6675BZ. They look very hard to remove without damaging the plastic fittings nearby. Here are the readings I got with my DMM set to continuity/diode mode (I've highlighted the difference from PQ2 and PQ1 in red):
PQ1 Results:
All the source pins to the drains are open circuit.
Source to gate is open circuit
All the drains to source pins give around 0.513.
Gate to source pins show 1.827.
There is continuity between all source pins and the same with all drain pins.
Drains to gate show open circuit
Gate pin to drains is open circuit
PQ2 Results:
All the source pins to the drains give around 1.665
Source to gate is open circuit
All the drains to source pins give around 0.511.
Gate to source pins show 1.827.
There is continuity between all source pins and the same with all drain pins.
Drains to gate show open circuit
Gate pin to drains is open circuit
I would appreciate it if someone with more knowledge would have a look at this information and let me know what they think. Does PQ1 look bad or not?
PQ1 Results:
All the source pins to the drains are open circuit.
Source to gate is open circuit
All the drains to source pins give around 0.513.
Gate to source pins show 1.827.
There is continuity between all source pins and the same with all drain pins.
Drains to gate show open circuit
Gate pin to drains is open circuit
PQ2 Results:
All the source pins to the drains give around 1.665
Source to gate is open circuit
All the drains to source pins give around 0.511.
Gate to source pins show 1.827.
There is continuity between all source pins and the same with all drain pins.
Drains to gate show open circuit
Gate pin to drains is open circuit
I would appreciate it if someone with more knowledge would have a look at this information and let me know what they think. Does PQ1 look bad or not?
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