Replacing A5sHB transistor (netbook)

[dorke]

Fully charged battery measures 4,12v on its terminals.

Pink-line doesn't measure anything.

Green-line measures 4,12v on all its traces.

O.k
I'm re-posting from #7:

Please post two separate and clear(so that the device markings are readable) photos of the two squared areas in green and pink.

 

[Paligap]

 

[Paligap]

That's the best that I can get with my phone.

 

[dorke]

That's the best that I can get with my phone.

The photos are not clear enough to read most parts.

 

[Paligap]

 

[dorke]

This is hard to follow.
are you getting a 5v on the usb port?
what do you measure on Q4 pins?
What voltage do you get between pins 8 and 4 of the 25x40 -windbond IC,
(near the VIA IC)?

In the top photo you have a bunch of dc-dc converters that should create the different dc voltages for the netbook.

I think you should operate the netbook with the battery alone and measure voltages from it's positive terminal to the devices it is getting to then measure the voltages you get on that device and continue tracing it to the next one.
Maybe this way we can find something.

 

[Paligap]

 

[Paligap]

I only get the 4,12 on the USB when I measure from the + pin of the battery, I get those 0,22v on the USB when I measure on GND and the + pin of the USB.

Don't measure anything on the IC, same case as the USB.

 

[dorke]

Please,measure the voltages on the 4 green arrows on the photo.
Only with battery connected(no adapter)
All measurements should be related to GND.

 

[Paligap]

Diode: 4,12v on its left pin (near the S) and 0,40v on its right pin.

The pins you marked on the Q show nothing but 0,2v.

 

[dorke]

Please mark the direction(cathode line) of D14 on the photo.

 

[Paligap]

Left is cathode where the S starts.

 

[dorke]

Please measure the yellow arrows and mark the other ss24 diodes.

 

[Paligap]

 

[dorke]

1. The 0.2v on the cathode of D1 is suspicious.
looks like it goes to the other side of the board through those 6 vias ,can you trace that connection.
2. Try to trace the 4.12V from the 000 ohm resistor.


3. Taking another look on the other side of the board ,
I see what may be test points for voltages,
many of them I just marked a few.
can you confirm and if so measure voltages on them.

 

[Paligap]

The Diode goes to those two resistor and the capacitor, on the other side of the board.

4,12v on that v. point, the rest don't measure anything.

I'll post the trace of the 000 resistor in few min.

 

[Paligap]

 

[dorke]

The Diode goes to those two resistor and the capacitor, on the other side of the board.

4,12v on that v. point, the rest don't measure anything.

I'll post the trace of the 000 resistor in few min.

View attachment 25546

Please,a clear photo of the area with the white trace .

 

[dorke]

View attachment 25547

1) The connection of D1 and D4 makes no sense ,
please re-check.
2) Please check the resistance from D1 cathode to GND.
3) Please check D1 in diode test mode (both directions).
4) Is there anything else written on the "A181" device".

 

[Paligap]

I apologize, my bad, it'd be like this:




The only Diode that measures at both sides is the D4, but it may be that it has that other little D beneath him.

Picture of the other side of the board related to the Diode: