Why is there no voltage on the motherboard?

Question

motherboards

Good afternoon!
Decided to turn on my old Toshiba Satellite A300 laptop. But, as it turned out, he refused to join.
Since I am a beginner in laptop repair (before that I could only change thermal paste), I am nobody at all in the circuits.
Here is the board itself.

First of all, I checked the voltage at the input - about 19.55V comes to the board, and then the voltage is lost. As I understand it, it is necessary to check the standby voltage (I was guided by the PWM controller, chokes and capacitors). There were two such places ...

... but there is no voltage on any throttle.
I found the voltage at the power input to the board, it is on three capacitors (if these are not capacitors, then correct me :), but not on the one that I highlighted in red

Answer 1

I correct that what you circled is not capacitors, but keys (mosfet transistors), they are responsible for supplying power and charging. They are controlled by the bq24721c power controller (it is nearby). By voltage, it seems that the controller determined the connection of the PSU. There should be no voltage on the L69 coil, it is in the battery charge circuit. Does the laptop show with LEDs that it sees power, sees the battery?
You correctly found the source of the duty room, U65 (next to the red electrical tape), look at the test pads next to it (PAD18-PAD20), it should be 19v came, 5v and 3.3v went away, where is it - you need to look for a circuit.
If you dig, look for a diagram on inventec potomac pt10s-6050a2169401-mb-a02.

Answer 2

Something got burned. Call fuse, elements from R010 and healthy coil from the last photo. There is a problem with odds somewhere.