820-3437 no power

[iClub]

820-3437 no power

This mac went through another assistance, where u7501 was missing and the tracks 17,18,19,20,21,22,23 and 24 of this component were missing, I remade the tracks and put the component u7501, I checked the connectivity.

Voltage:
PPbus_g3h 8.60V; pp3v42_g3h 3.32V; pp5v_s0 0v; ALL_SYS_PWRGD 0.3 , no pulse; PM_SLP_S4_L 0v, no pulse; SMC_RESET_L 3.37v; PPVRTC_G3H 3.41V;

Coils:
L7130 8.60/8.73V
L7520 0v, no pulse
L7560 0v, no pulse
L7430 0V, pulseless
L7630 0V, no pulse
L7310 0V
L7320 0V

 

[2informaticos]

Post diode mode at L7520/60.
If charger has been connected without U7501, one of Q7520/60 could be fried now...

 

[iClub]

L7520 0. 448V
L7560 0.375V.
Replaces q7520/60 and made another jumper on the PP5V_S5 mesh that had no connection.solved on the L7560 3.33V coil, the L7520 coil is missing

 

[iClub]

These are the output voltages of u7501, are they correct ?
P3V3_S5_DRVH 3.33V; PPBUS_S5_HS_OTHER_ISNS 8.61V; P5VP3V3_VREG3 3.31V; P3V3S5_EN_R 3.31V; P5VP3V3_SKIPSEL 2V; P3V3_S5_CSP2 3.33V; S5_PWRGD 3.38V; 3.33V.

 

[2informaticos]

As you get now 3V3_S5, check 3V3_SUS presence, PCH_DSWVRMEN and PM_DSW_PWRGD.

 

[iClub]

PP3V3_SUS 0v; PP3V3_S5 3.33v; PCH_DSWVRMEN 3.05V; PM_DSW_PWRGD 0V;

COILS: L7560 3.33V; L7430 0V and L7630 0V, without pulse ; L7310/20 0V;

U7600 all pins are with 0V.

 

[2informaticos]

"PM_DSW_PWRGD 0V"
Check SMC_S5_PWRGD_VIN.
If OK, there can be a problem with SMC.
Try to reflow it, and reball if no result.

 

[iClub]

"Verifique SMC_S5_PWRGD_VIN "
I see that tomorrow.
I performed the SMC reball, without success.

 

[iClub]

SMC_S5_PWRGD_VIN 3.35V.
L7630 0v, pulso 130mA;
L7430 0v, pulso 110mA;
All_SYS 0v;PP3V3_S4 0v; PM_SLP_S4_L 0.13V; PM_SLP_SUS_L 3.34V; PM_SLP_S0_L 0.14V
I already did the SMC reball.

 

[2informaticos]

No idea how can you catch mA puls on a coil .

If S5_PWRGD is OK and PM_DSW_PWRGD is low, then bad SMC; PCH can also pull down the signal, because of some internal problem.

 

[iClub]

started to cool the cooler, but after I reballed the u6100, u1900, Q8150 and u1950 the cooler stopped spinning and the voltages in the coils were missing.

 

[2informaticos]

Re-check your job.
Let Q8150 out of board; is not really needed.

 

[iClub]

q7630 is heating up, replacing but without results.
Can you tell me the input and output voltages of u74/7600 ?

 

[2informaticos]

Which voltages do you get now on the board?
Any short on big coils?