Maker Pro
Maker Pro

Motherboard LA-7871 Avell Laptop

Leonardo Cipriani

Mar 10, 2018
2
Joined
Mar 10, 2018
Messages
2
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

Apr 12, 2017
258
Joined
Apr 12, 2017
Messages
258
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

Mar 10, 2018
2
Joined
Mar 10, 2018
Messages
2
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

Apr 12, 2017
258
Joined
Apr 12, 2017
Messages
258
Any idea what happened to the mobo in the first place?

Have you been replacing mosfets with identical parts?
 
Top