Charger U GATE is 5.5 volts and L gate is 50 millivolts. The SMBUS lines are both 3.3. I'm just making sure because I've replaced a lot of stuff so far, is this another bad ISL chip? Q7180 appears to be opening now as I get 18 volts on the source and 7 in the gate. And the ISL is not scolding hot anymore
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820-3476 1 volt on PPBUS_G3H
- Thread starter JohnB8812
- Start date
I'm confused now. I have replaced all of the components but something weird happens when I put Q7130 on the board. With just a new Q7180, ISL, and Q7155 my resistance to ground on PPBUS is many kilohms. HOWEVER, when I put Q7130 on the board, the resistance to ground drops to around 0.62 kilohms. I have checked continuity from 6 and 7 of Q7130 to the other side of the board and I get continuity.
In diode mode with Q7130 on the board:
Pin 2: 0.557 on or off the board
Pin 7: 0.128 seems really low compared to donor, normal measurement consistent with donor when off of the board
Pin 6: 0.499 on or off board
I checked my soldering, I have tried a few Q7130's from an identical donor and a few Air boards (don't have anymore Retina boards I can try), and each time I put it on the board, the resistance measurements on PPBUS and CHGR_PHASE go down. I have also replaced C7145 as it looked nasty. No short on that line or any of the lines that I can find unless I put Q7130 on the board. Is there anything else that can be causing this to go low? Don't want to put power through until I relieve that short or I want to know if it normally pulls the resistance down when on the board (doesn't seem like it).
In diode mode with Q7130 on the board:
Pin 2: 0.557 on or off the board
Pin 7: 0.128 seems really low compared to donor, normal measurement consistent with donor when off of the board
Pin 6: 0.499 on or off board
I checked my soldering, I have tried a few Q7130's from an identical donor and a few Air boards (don't have anymore Retina boards I can try), and each time I put it on the board, the resistance measurements on PPBUS and CHGR_PHASE go down. I have also replaced C7145 as it looked nasty. No short on that line or any of the lines that I can find unless I put Q7130 on the board. Is there anything else that can be causing this to go low? Don't want to put power through until I relieve that short or I want to know if it normally pulls the resistance down when on the board (doesn't seem like it).
Any ideas? I can't figure out what is up I get a low resistance measurement on the creation side, but if I put any voltage through either side, I get zero on the creation side and 0.010 amps on the system side. Could this be a blown internal trace? Nothing seems to get hot
At 400 Ohm nothing will get hot as this is way to much resistance to let any significant current flow. I have no idea what is going on right now.
For testing, the board should be able to power on from a charged battery with the fuse removed. Need to short the power on pads of course.
For testing, the board should be able to power on from a charged battery with the fuse removed. Need to short the power on pads of course.