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but dont even have pm_slp_s5_l after change of U8080

already done done that, with U8080 removed no short on FET_RAMP. with new U8080 all s4 rails are gone

U8080 measurements PP5V_S4 5v P5VS0_EN 3.3v P5VS0_FET_RAMP was shorted so replaced U8080 and short is gone Now to the interesting. All s4 lines are gone and dont have pm_slp_s5_l Tested to change U8080 back to the original one and all lines are back but PP5V_S0 0.219v. Tested another new...

Working on a 820-3476 bord, no fan spin Measurements PPBUS_G3H 12.62v PPBUS_S5_HS_COMPUTING 12.63 PPBUS_S5_HS_OTHER5V 12.63v PPVRTC_G3H 3.34 PP5V_S4 5.15v PP5V_S0 0.219v 0.401v in diode mode PP3V3_S0 3.3v CPU getting hot

One more to the donor board pile. 3v3_s5 short and CPU heats up

solved it so far. Pad under R5100 was gone replaced and now I have green and orange light and ppbus are 12.6 volts. Still no fan spin but one step closer

Hello Im working on a 820-3476 board and cant understand whats wrong with it. Have replaced SMC with no change. Some measurements PP3V42_G3H 3.43V ppbus_g3h . 12.3v SMC_BC_ACOK 3.4v SMC_BC_ACOK_VCC 3.4v ADAPTER_SENSE 2.84v SYS_ONEWIRE 2.85v As always Im using genuine charger and tried...

Yes thats what I thinking of. Resistance to ground and 1.7V on PPBUS makes me thinking of that short. If I measure VCore and it also shows 1.7V should confirm it am I right?

yes I know but half of the board heats up just besides the cpu but cant find one component as I usually do. But how come ppbus is 1.7 and not 0v if shorted?

Pin 2 PPBUS_G3H thats 10 ohm. Already tried inserted voltage, nothing getting hot with 1 volts Strange thing is that my psu dont send out constant current before getting over 2 V. At 1.7v it draws 0.323 Ah. But over 2 V it sends out constant current but cant really find the short. A big part of...

Working on a 820-3435 board Have green light PPBUS are only 1.7v. removed F7040 and PPBUS only have resistent of 10ohm. So not fully shorted.

changed the battery and everything works just fine. seems the fults in this case was: Bad smc Bad U7000 Bad keyboard Bad battery thanks for your help

R5040 measures right already removed q5040 many times, did it again with no change =) shouldnt the battery charge even in smc bypass mode? Are PP5V S4 REG coming on after SMC_BATLOW_L?

isn't there anything else that makes the SMC_BATLOW_L 0.024V? cant figure this out shouldn't the battery charge in smc bypass mode?

it starts up in smc bypass but cant find ssd so no boot and no battery charging. SMC_ADAPTER_EN is high DC-in board changed

Ok, thank you for good explanation =) Strange it doesnt get high tied 3 smc all with exact the same measurements. I use both my PSU and original charger when working with the boards but never got any difference between my PSU and charger.

already tested with that. Can it need the battery to be connected? or something else can be wrong?

Now I have replaced the SMC again but still the same. No SMC_BATLOW_L :( Seems I cant figure this out. Fan pulsing and no start. Not charging. Starts in SMC bypass mode but not booting cant see SSD. Is there anything else that can cause SMC_BATLOW_L not getting high?

will SMC_BATLOW_L be high even without battery connected?

no SMC_BATLOW_L 0V already changed U7940 2 times and no change