hi, how do i find of value broken smd capasitor, i have no idea,

 

For a start, what makes you think it is broken? Is there a better pic showing a crack?
Anyway, it can be very hard to measure caps like that if they are broken, but if there is any connection left on each end you may get reading with a capacitance meter. Carefully unsolder it from the board first.
Another way is to trace out the circuit and if it is just a supply bypass, as it looks to me it may be, the value is not too critical. There looks to be a small cap in parallel with a larger one. If it is flat, try a 100nF ceramic, but if it is as high as it is wide, it may be a 1uF or even a 10uF ceramic. This is assuming it is the bigger capacitor in the picture.
Have a look at the data of the chip used in the circuit and that may help you determine the value. There are often app notes with example circuits there.

 

I use multimeter and capasitor short cirquit, maybe I just solder up and test which is short, this is acer usb jack 4720Z,and I'll trying to search internet diagram of Acer laptop, and not found,thank you

 

I use multimeter and capasitor short cirquit, maybe I just solder up and test which is short, this is acer usb jack 4720Z,and I'll trying to search internet diagram of Acer laptop, and not found,thank you

The capacitor must be removed from the board to measure capacitance. Other paths to ground (through resistors) will screw up the capacitance meter.

 

The cap may not be the trouble. There are other things that could be shorted too. But yes, to measure the caps, they do need to be removed from the board first.
What is the IC nearby?

 

OK, I will remove it, thank you

 

fds 6900a mosfet

The cap may not be the trouble. There are other things that could be shorted too. But yes, to measure the caps, they do need to be removed from the board first.
What is the IC nearby?

 

If I had to replace it, I would start with a 0.1μF cap. The cap looks too small to be anything larger (it looks like an 0603).

 

Why don't you start by telling us what is wrong with the board? Before you come to the conclusion you have a bad cap, run it by us, what's going on or NOT going on? Why are you looking at the board in the first place? What is it you think is wrong? OK, you've said you think the cap is bad. Well, I've been in the business 30 years and I don't recall ever seeing one of those caps going bad. I'm sure it COULD be bad; but unless you remove it from the circuit you're not going to get a reliable measurement as to what it might be. BUT BEFORE you remove it - lets see if we can help you figure out what's bad with the circuit. Let's not jump to any conclusions. Let's FULLY diagnose the board first.

 

First, before that thing happen,
At the screen laptop show text ' broken hard ware' and maybe 1 minutes, laptop shutdown ,the led at adapter blinking, and at USB jack is hot,I'm opening the laptop checking the elektrolytic capasitor has weak, I change with a new, i test only usb jack and mainboard, see the mosfet fdd 6685 too hot ,change with a new, and test only mainbord and usb jack connect only, the fdd 6685 ,broke again, i check using multimeter, i see the short cirquit, at the some component, that it

 

Honestly, I've never heard of a broken laptop telling you it was broken. My first thought is that there's not a hardware problem but possibly a virus. I'm hoping I'm wrong. Lets see what others have to say about this.

 

If I had to replace it, I would start with a 0.1μF cap. The cap looks too small to be anything larger (it looks like an 0603).

Multilayer ceramic chip capacitors have a pretty impressive size/capacitance figure, I've seen a brochure touting up to 180uF.

The neighbourhood of that component could be an onboard switching regulator. that cap could be as high as 22uF.

 

Yes, I'm impressed by how much capacitance is now crammed into the small ceramics now. Over the years I've been designing and repairing stuff, the capacitance has risen greatly.
I've seen a couple of caps die, but it is very unusual. My vote is for some other thing to be faulty.
Try to trace the circuit in that area out so a bit of an idea about what is going on will help to diagnose the problem.
Have you removed the caps and measured them yet? And can you do that ok without damaging them or the board?

 

Yes, I'm impressed by how much capacitance is now crammed into the small ceramics now. Over the years I've been designing and repairing stuff, the capacitance has risen greatly.
I've seen a couple of caps die, but it is very unusual. My vote is for some other thing to be faulty.
Try to trace the circuit in that area out so a bit of an idea about what is going on will help to diagnose the problem.
Have you removed the caps and measured them yet? And can you do that ok without damaging them or the board?

Now i trying to check what is problem going to short that cirquit,

 

USB jack is free from short cirquit now, change with new mosfet ,I'll test only USB jack, run ok,just now about main board, before it I change electrolytic cap, I'll check again but nothing short current at my cap repair, I'll just remove mos fet at main board because not run, the mainboard just short, don't see cap crack, have any hint?

 

Some sort of TVS diode short circuit perhaps? Seeing as you believe this is USB related, they're usually the first thing to go when someone plugs in something they shouldn't. Look for diodes, measure in diode test mode (voltage drop) in both directions.

 

Some sort of TVS diode short circuit perhaps? Seeing as you believe this is USB related, they're usually the first thing to go when someone plugs in something they shouldn't. Look for diodes, measure in diode test mode (voltage drop) in both directions.

About diod its ok

 

This is, another one short, I want to buy, but, they was stop sell, The data sheet of this mosfet is gone, im search at internet ,I just to buy a new version, anyone know?