Electronics > Beginners
help with capacitors
thedoc298:
Every board I have worked on that ended up having bad caps, was showing problems before it finally died. Like takeing several trys to boot, shutting down for no reason and other wierd problems. So unless you see bloated caps I sure would not waste my time.
sviesusisalus:
xe xe, viewed the same videos you just posted :)
Asus C60M1I
will run down the same tests you just mentioned as soon as i get the moment.
all caps are polymer. so as wraper mentioned there will be nothing visual.
sviesusisalus:
Sadly my multimeter does not have continuity mode.
Found two PA102FDG mosfets which do not have resistance between drain and source.
Also found several P0903BDL and five of them have resistance 157 Ohm, 16 Ohm, 180 Ohm, 120 Ohm.
Others had resistance about 3k-4k Ohm.
So i assume those five that had lowest resistance should be replaced?
mariush:
The 16 ohm one is suspect. The others is debatable.
You'd know for sure if you remove them from the board and measure them separately.
Keep in mind that if a mosfet died, it may have killed the vrm controller that controls it as well ex sending 12v through the gate pin back towards the controller which controls those 4 mosfets.
Continuity mode is just resistance measurement with sound if the resistance is less than some value, let's say around 10 ohms, it varies from meter to meter.
sviesusisalus:
desoldered that low resistance mosfet (PQ10 in screenshot). seems to be fine out of board.
Yes, my soldering skills and tools are laughable. Yes i ripped the pad off. Wire will work just fine there.
PQ10 and PQ9 are the same model.
A hint maybe what should i be looking for next ?
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