Motherboard LA-7871 Avell Laptop

[Leonardo Cipriani]

When I got this board and at first moment it was in short circuit.
I removed the short one and the some LEDs now flashing
I have already switched PWM, CI Charger and it still does not turn on.
It stays in a loop and not turn on.
I recorded a demo video. ( in portuguese, but we can see the problem in action )
Can anyone help me find the way to the solution?

 

[KilgoreCemetery]

Just to cover our bases, are you using a known good processor and RAM stick?

It looks like the board is stuck in protection mode. Do you have a schematic for it?

I removed the short one and the some LEDs now flashing

Does this mean you already fixed something on it? What did you fix?

 

[Leonardo Cipriani]

Hello @KilgoreCemetery thx for your reply.

Yes, I switched some mosfets in primary and secondary (3 and 5v). I found too two shorted capacitors and switched to good ones.

After this first post I found too one more shorted mosfet in 5v.

Now the mobo is dead. Nothing happens. Even the leds anymore lights up.

Later I will attach the schematic here.

 

[KilgoreCemetery]

Any idea what happened to the mobo in the first place?

Have you been replacing mosfets with identical parts?