820-00164 dead no green light

[Soji]

Ppbus_g3h is 1v
Pp3v42 is 2.6v
All_sys_pwrgd=0v
I have removed u8150 no changes...
No corrosion on the motherboard
R7012 is fine and f7000 is okay...
What to do?

 

[2informaticos]

Remove F7140 and check C7140 voltage.
Also check diode mode to ground on both sides of the fuse.

Post U7100 basic voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.

Did you try fake charger, or lab PSU?

 

[Soji]

After removing F7140 pin1 is =0.435 pin 2 is 0.175
0V at c7140

 

[Soji]

Should i post u7100 voltages without F7140

 

[Soji]

No changes with fake charger

 

[Soji]

Pin 1=0v
2=16.28v
3=0v
9=0v
12=1.9v
13=0v
14=0v
15=0.340
17=0v
19=5v
20=5v
27=0v

 

[2informaticos]

"3=0v"
Check diode mode to ground.
C7111 and R7110 are the suspects there.

Post now U7090 voltages.
Check diode mode to ground at L7095.

 

[Soji]

C7111=0.003
R7110=0.003

diode mode to ground at L7095=2.005
U7090 voltages
Pin1=1.3v
Pin2=1.942v
Pin3=4.3v
Pin4=1.9v
Pin5=gnd
Pin6=16v
Pin7=unconnected
Pin8=16v
Pin9=gnd

 

[2informaticos]

Remove C7111 and check diode mode again.
If still short, replace U7100.

"diode mode to ground at L7095=2.005"
Please check correctly...

Check R7095/96 values and traces.
If good, replace U7090.

 

[Soji]

R7095 is broken can i replace with a 200kohm resistor?
have replaced u7000 short gone

 

[Soji]

I have replaced R7095
Ppbus_g3h still 3v
Pp3v42_g3h=3.42

 

[2informaticos]

"Ppbus_g3h still 3v"
Post again U71000 voltages...

 

[Soji]

Pin 1=0v
2=16v
3=4.3v
9=0v
12=3.42v
13=3.39v
14=3.394v
15=0v
17=0.6v
19=5v
20=5v
27=16v

 

[Soji]

Bad u7100...it was from a donor board now replaced with new one thanks

 

[Soji]

the board stopped working now ppbus_g3h is now 5V after coupling

 

[2informaticos]

Maybe bad solders.
Be sure C7125 is good.

Post again U7100 voltages.