820-01700 water damage PPBUS_G3H 0.25 dido mode.

[yair37]

water damage mostly on PPBUS_HS_CPU.
clean all but PPBUS_G3H 0.25 on dido mode. can see any bad big cup.

 

[2informaticos]

Post diode mode reading with black probe at ground too.
Check if you get similar readings on any big coil.

 

[yair37]

all the coils same reading:
red on ground after bath cleaning 0.45
black on ground 0.22

 

[2informaticos]

Which coils???
I doubt all the coils from MLB give the same readings to ground!
A coil with similar reading like PPBUS_G3H, can denote shorted high-side MOSFET.

 

[yair37]

i was checking just ppbus coils..

 

[2informaticos]

Do you mean coils directly connected to PPBUS_G3H, why?
Did you expect to get different readings in different points of the same power rail???

With black at ground, you should get OL in diode mode at PPBUS_G3H.
Again, compare with diode mode to ground (both directions) on all big coils from secondary power supplies.
Just for example, L8102, L7700/01, L7600/60, and many more...

 

[yair37]

L330-
cpuvr_swsa
ppvccsa_cpu_r
there was water damage at this area..but i was clean ant all the area look good.

 

[yair37]

it was u7370 that short..replace it.
now..20v on charger ,one fan spin, no screen and no keyboard activity.

 

[2informaticos]

Should I undestand that you get the same readings on L7330?
To be sure, check resistance between L7330 and PPBUS_G3H.

 

[yair37]

it was u7370 that short..replace it.
now..20v on charger ,one fan spin, no screen and no keyboard activity.

yes now its o.k...but there is a new problem

 

[yair37]

To be sure, check resistance between L7330 and PPBUS_G3H.

O.L

 

[yair37]

running from 1000 to O.L
now ppus_g3h:
12.6v
diode mode: 390

 

[2informaticos]

If already got correct PPBUS_G3H, no reason to check diode mode to L7330.
My previous post was writen before, but appeared after yours.

Check voltage on the big coils now.

 

[yair37]

first the board no turn on(fan spin) just with the charger only with charger and battery cable with and without battery.
all the big coils has the right voltage except PPVIN_S0SW_LCDBKLT- 0.6V with and without screen connected.

 

[yair37]

first the board no turn on(fan spin) just with the charger

not turn on just with charger....there is 20v on all ports.

 

[2informaticos]

"the board no turn on(fan spin)"
If fan spins, board is turned on.
Don't get confused between turning on and booting!

"first the board no turn on(fan spin) just with the charger only with charger and battery cable with and without battery."
Can you rewrite using corresponding dots and commas?
Help us to understand what you want to say.
Please, post accurate and intelligible information...

 

[yair37]

the fans not spin when i plug the charger(without battery or battery cable connected.
they start to spin just if the battery or just with the battery ribbon cable are connected to.

 

[2informaticos]

No idea what kind of translator are you using, but doesn't help at all...
I really don't understand what you mean to say about battery and its data cable.

When the board turns on, what is L7211/21/31 voltage?
No need to check on the 3 coils; one is enough.

 

[yair37]

i don't use translate
usually if you connect just the charger the board it turn on, but in my case the board turn on just if the charger and the battery connect!

When the board turns on, what is L7211/21/31 voltage?

0v and they short diode mode 0.03

 

[2informaticos]

Probably no short; low values normal for this board.

Try now to put the board in DFU mode.