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[SOLVED]820-3476 PPBUS low no power

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aurel476

aurel476

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no liquide damage, just customer used magsafe 45W, no power from charger and battery PP3V42_G3h present 3.41V and ppbus_g3h 0.6V tried magsafe 60w same pb already checked U7100 pin 17/18 and 27/28, smc_bc_acok 3.3v
 
aurel476

aurel476

New member
PPBUS_G3H 0.6V resistance to gnd on PPBUS_G3H and PPVBAT_G3H_CHGR_REG short to gnd 0 ohm short to gnd CHGR_CSO_R_N, CHGR_CSO_P_N
 
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larossmann

larossmann

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I don't understand what you are saying about CHGR_CSO_R_N, CHGR_CSO_P_N, but if there is a 0 ohm short to ground on F7140, time to remove F7140 and see which side the short circuit is on. If it is on pin 2, something is wrong with the system side, if it is on pin 1, something is wrong with the ISL6259 side. If the issue is on the system side I would begin by checking resistance between pin 2 of F7140 and the CPU coils, PP3V3_S5 coils, PP5V_S4 coil, and so on, and if no short is present there then inject 1v to see what gets hot and find the short.
 
aurel476

aurel476

New member
short on pin 2 of F7140

51 ohm cpu coils to pin 2 of F7140

3.75 kohms PP3V3_S5 coils to pin 2 F7140

PP5V_S5 30k ohms coil to pin 2 of F7140

inject 1v to pin 2 of F7140 nothing hot
 
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D

dukefawks

Administrator
Inject voltage and monitor current. At 2 amps something must get hot. This bus is normally 12V so you can go a lot higher.
 
aurel476

aurel476

New member
yes find bad capacitor C7582 now another problem PP3V42_G3H 2.5V and no green/orange light, Q7010 very hot, replaced and always hot

no short to gnd pin of Q7010
 
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aurel476

aurel476

New member
inject 3V, current 0.24a find smc hot replaced now i've green light / orange light and no fan spin not power on

PP3V42_G3H 3.42V and PPBUS_G3H 12.61v

SMC_BC_ACOK 3.39V

SMC_RESET_L 3.39V

PP3V3_SUS 3.34V

Already checked resistance SPI Bus Series Termination, next step diodmode without U6100 ?
 
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D

dukefawks

Administrator
I don't get your logic. You say this was not water damaged so why check U6100?

If this really "just" happened it would have been because of a garbage Chinese charger and 3V42 spiking or something. An issue with PPVRTC/clock chip is more likely then.
 
D

dukefawks

Administrator
This board had a voltage spike, so many things could be dead. It could really be anything :(

You could check for power cycling on the S0 rails
 
aurel476

aurel476

New member
PP1V05_S0 2.7mV

PP1V5_S0 0V

PP3V3_S0 0.183V

PP5V_S0 0v

PP5V_S0_FET 0.6mV

PP3V3_S0 0.182V

no pulse no cycle :/

I do not know if it's normal to L7630, continuity 1 beep / second and stop one beep and stop loop, (without chargeur plugged of course)
 
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