820-4924 no PPBUS_G3H

[Sr. Robot]

PPBUS_G3H is 0.5v, diode mode to ground is 0.113.

removed F7140, PPBUS_G3H is 0v. Removed L7130 still no PPBUS_G3H

PP3V42_G3H diode mode is 0.256


U7100 basic voltages (F1740 and L7130 removed)

1 = 0v

2 = 16.5v

3 = 4v

9 = 0v

12= 0v

13 = 0v

14 = 0v

15 = 0v

17 = 0v

19 = 5.5v

20 = 5.5v

27 = 16.2v

 

[Sr. Robot]

Replaced Q7180 just in case, no change.

R7121/2 10 ohms each. Resistance between pins 27 and 28 is 20.8ohms

 

[Sr. Robot]

Q7010 had a bit of corrosion on pin 4. Replaced it now i get fluctuating PP18V5_DCIN_FUSE from 16.v to 12v

 

[2informaticos]

"L7130 removed"
Do you really expect something relevant in such case???
Put back the coil.

"removed F7140, PPBUS_G3H is 0v"
Shouldn't be better to check voltage BEFORE the fuse, not after (once removed)???

3V42G3H MUST appear before PPBUS_G3H.
Post U7090 voltages.

 

[Sr. Robot]

P3V42G3H_FB 0v
PP3V42_G3H 0v
P3V42G3H_BOOST 0v
P3V42G3H_SW 0v
PPVIN_G3H_P3V42G3H 0.6v
P3V42G3H_SHDN_L 0.6v

 

[2informaticos]

Now post Q7010 voltages.

 

[Sr. Robot]

PPDCIN_G3H = 16.3v (pulses down to 13v)
DCIN_ISOL_GATE_R = 6.73v

PPDCIN_G3H_ISOL = 16.3v (pulses down to 12v)

 

[2informaticos]

Check R7020 and D7005.

 

[Sr. Robot]

R7020 measures good. D7005 was odd looking and replaced it just in case. Now i get the same voltages but PPDCIN_G3H is more stable (only pulsing for about 0.1v).

Q7010 and U7090voltages remain the same

 

[2informaticos]

Post voltages on R7020 and D7005.
Also check diode mode to ground at C7090.

 

[Sr. Robot]

it was a bad D7005. Thanks again.

 

[Sr. Robot]

But now the battery is not charging.

Tried good battery, no change.

If battery is connected it tas a while for green light to come on, some times i have to reconnect it several times for light to come up.

After boot, if i disconnect the charger, the laptop goes to sleep. Battery not detected by OS (no battery icon or system info)

PPBUS_G3H is 12.2v (without battery), 12.2v (with both charger and battery), and 11.78 with only battery.

SCL and SDA diode mode to ground is 0.453

CHGR_A/BMON are 0v with and without battery connected.

battery bus voltages:
w/battery:
SCL: 0.9v
SDA: pulsing to 3.4v

w/o battery: same behaviour

Pins 17/18 of U7100 is 3.9 ohms. 27/28 is 20.1 ohms

 

[2informaticos]

Reflow SMC; replace if still same issue.

 

[Sr. Robot]

Reflowed SMC no change. Replaced ISL just in case before replacing SMC. It was the ISL.

Thank you