Recent content by Fanfwe

Do you know what's required as input on U7800 for it to make PMIC_EN_P3V3S5 high ? PMIC_EN_P3V3S5 is PGD, so does that mean that it needs VSD to be good ? Or VSA, VSB, VSC, VSD all need to be good ? I assume VSx stands for Voltage Sense, and PGx stands for Power Good, so I'd expect PGD to turn...

No, no pulse. It goes from floating state to 0V when I connect charger and that's it. And I do get the LDOs (PP3V1_RTC, PP3V3_LDO3V, PP1V25_VREF) with the new chip too. So, you suggest that I try again with another U7800 ?

Both resistors are good, SMC_PM_G2_EN is high

Hi, So I finally received my parts. U7800 replaced, but PMIC_EN_P3V3S5 is still low.

Yeah that's what I thought too. I don't have any right now. I'll put this aside for now and report back later once I get some and replaced it. Thanks

U7650 replaced. Still the same issue.

Diode mode at 5V_S5 is 0.410V, so there's no short. Traces, solders and probe points look okay, and I have tested continuity for the few ones I had a small doubt, they are all good. I guess I'll try to replace the chip, just in case as you said, but I can't see how it can be the issue when the...

Diode mode and resistance to ground: L7670: 0.407V 900Ohms L7690: 0.353V 780Ohms PPVCCGT: 0.0023V 4.6Ohms PPVCCCPU: 0.0043V 9Ohms PPVCCSA: 0.0066V 13.37Ohms PPVCCPCH: 0.0652V 130Ohms PPVCCIO: 0.0531V 106Ohms

PPBUS is 13.02V And yeah I should maybe have started there, but no issue with the CD3215 stuff, of course. 20V from charger, which also implies 3v3_g3h is indeed present.

Hi, I have this 820-00840-A board with liquid damage around U7650 and the backlight stuff also. I've narrowed it down to U7650 not creating PP5V_S5 and that's due to PMIC_EN_P3V3S5 missing. So, checking around PMIC, I could see that PP3V1_RTC is good, PP3V3_LDO3V is good, PP1V25_VREF is good...

OK thanks. The liquid marks are not on U7800, just to make it clear. That area looks pristine. But yeah, my action plan right now will be to remove the few caps on the PP3V1_RTC line and check if the short goes away. If not, then I will reheat U7800, and if this still doesn't help, I will remove...

Hi, I have this board that have signs of liquid spill. It won't turn on. CD3215 stuff works fine, I get 20V on the charger, so I have good PP3V3_G3H and PPBUS_G3H is present also. But then I get no other rails, no S5, S4 and probably nothing else either. The enable signal for those rails all...

I already went to trackpad settings, and the haptic option was turned on. But as per your suggestion, I just tried a PRAM reset, and yup, it did the trick. Thanks !

Hi, I'm not quite sure if this is a logic board issue, but since it may, I'm asking anyway. I got a 15-inch touchbar macbook pro with no keyboard and no touchpad. Knowing that keyboard goes into the touchpad, I immediately suspected the touchpad or its ribbon cable. The cable got replaced but...

Yes of course. All the measurements above were done with the board alone. The test with the ROM swap also.