Acer E5-575G-70FG No video

[digitalblade]

Hi,
as per title, I've an Acer with no image on screen.

This is my first try to fix a laptop.

• the laptop show red led immediately after attaching power source (bettery charging circuit)
• Power button seem ok, when pressed a blue light shown on left of the red one after 2 seconds (more or less)
• Nothing visibly damaged (no evident blown components )
• I checked some caps and around the power section, everything seem
  fine... nothing seem short, power rails seem ok (19V Or 3.3v found on all tested components)
• Fan start after around 20 seconds after starting the laptop
• Cpu became a little bit hot so seem that correctly receive power

how can I diagnose this problem more deeply?

Thank you for any suggestion and support.

[mcplslg123]

Re: Acer E5-575G-70FG No video

To begin with, measure voltage on all big grey coils.

[digitalblade]

Re: Acer E5-575G-70FG No video

@mcplslg123 thank you very much!

Following you suggestion I found something... take a look at attached image, the coil numbered 1 don't have any power... everything around seem ok... no shorts and all voltages seem ok.

I suspect that the problem can be the Mosfet that I've marked as 2.
Seem that don't send power to the coil... the id over the component is
Z5049QI (there is a second line below the first one and is TA612D I don't know if this is relevant) can be this the culprit?

I just discovere another things! sorry but I miss that all the capacitors marked as 3 in the picture are short to ground!! what I can check next?

thank you again!