5 820-3662 PPDCIN_G3H and PPBUS_G3H short to ground
Hi, I have a macbook pro 2013 with a short to ground on PPDCIN_G3H and other rails it share (PPDCIN_G3H_INRUSH, CHGR_PHASE etc.)
I tried to replace ISL6259, but no change. Then I tried to inject voltage to PPDCIN_G3H_CHRG. It draws 3 A at 0.2 V and Q7130 is slightly warm, but when I inject voltage on the other side - CHGR_PHASE, nothing gets really hot. So I guess the problem is on that side of FET. Fuses F7140 and F7141 are good, so PPBUS_G3H is also shorted
Any ideas what i should do? Thanks
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3 件のコメント
Have you got this issue solved? I'm experiencing something similar with an 820-2914-B. When I remove the FETs I get some voltage rails. I've replaced U7000 several times and the problem persists. I'd appreciate your reply.
Gerson Bernardo さんによる
Yes, as I mentioned in the other comment. Problem was Q7130 and Q7135. They were completely shorted - 0 ohm so they did not get hot at all. P=R*I*I. So when there is no resistance -> no heat
Adam Grufík さんによる
Dear friend, thanks for your reply. In my case, I replaced the FeTs as many times. They didn't blow in the process and when I test with the multimeter they're still working properly. In fact when I remove Q7030 and keep Q7035 I have greenlight and some voltage In the rails. However, when both FETs are soldered on the board, the MagSafe gives me an instant green light. If I keep the MagSafe connected I can observe pulsed green light. I checked the resistors around the U7000 several times, replaced caps, checked the path between U7000 and the FET, checked the path between the feet and C7025 as well as between C7025 and U7000. I'm really !#^&@@ about this situation. Can you give some (green light ) on this thread?
I'd appreciate any help.
Gerson Bernardo さんによる