820-00923 water damage 5v no ppbus

[2informaticos]

"PP5V_S4_T_USBC diode mode 250(low?)"
Compare diode mode readings at L3500/B700.

 

[yair37]

Compare diode mode readings at L3500/B700.

same, diode mode on both 250

 

[2informaticos]

Then should be correct value.

Actually PPBUS_G3H is present only with battery connected (F7000 soldered)?

 

[yair37]

its crazy any few min its act different, the new act now. is..
no battery: if I'm waiting 5min and plug the charger I get 19v 0.5A fans full spin but no screen or keyboard activity.

 

[yair37]

but if i disconnect the charger and connect again it back to 19v 0.04a

 

[yair37]

suddenly bbpus diode mode 100 and PPVBAT_G3H_CHGR_REG diode mode 650

 

[2informaticos]

Allow 15s after disconnect the charger/battery and check again diode mode on PPBUS_G3H.

 

[yair37]

I think I by mistake short the F7000 but it’s not from him I was take him out and still the same.

 

[2informaticos]

Still 0.100 diode mode at PPBUS_G3H?
What side of F7000 (fuse removed)?

 

[yair37]

The ppbus side 100, F7000 removed, ppvbat side is 650

 

[2informaticos]

Check if any big coil gets the same reading to ground.

 

[yair37]

o.k back to this s*** board.

charging 5v 0.3a
PPBUS_G3H -0.6V DIDE MODE 450
PP3V3_G3H- 3.3V
PPVBAT_G3H_CHRG_REG 0.6V DIDE MODE 450
dont know how to continue from here...

 

[2informaticos]

You don't get 0.100 in diode mode at pin 2 of F7000 anymore?
That's good, but what did you find as bad component there?
Also check diode mode reading in reverse way (black probe at ground); should get OL.

 

[yair37]

You don't get 0.100 in diode mode at pin 2 of F7000 anymore?

now its 0.450

That's good, but what did you find as bad component there?

i dont do nothing!! this board drive me crazy! sometimes is 20v ppbus is 13v and suddenly its 5v ppbus 0.5v ...now its look stable so i want to restart the work...

Also check diode mode reading in reverse way (black probe at ground); should get OL.

yes F7000 is OL.

 

[2informaticos]

Do you get correct PPBUS_G3H voltage now?
Is F7000 soldered back?
Is the battery charging?

 

[yair37]

No no…
Charging 5v 0.3a
PPBUS 0.5v
F7000 is connected

 

[2informaticos]

What voltages do you get, with good battery connected?
Don't forget battery data cable...

 

[yair37]

What voltages do you get, with good battery connected?
Don't forget battery data cable...

same 0.6v

 

[2informaticos]

I suppose that voltage with battery alone.
I was expecting to get the voltage with both charger and battery connected too.

BTW, really need to quote the previous post entire???

 

[yair37]

Just charger , battery alone and with charger with battery connected the same voltage..
F7000 0.6v