Blown capacitor? on acer 7739

[rippergr]

Hello all,
I have an acer 7739 laptop which stroke by lightning. When I put the ac adaptor it doesnt work and short the adaptor. I check the + and - on jack and it is short to ground.
I found a blown capacitor(I think it's capacitor) but I don't know what exactly is to change it and I cannot find it on schematics.
I attached pictures and schematics but I dont know if the schematics are correct.

[newtothis]

Re: Blown capacitor? on acer 7739

Firstly while I download the schems for it... Give it a clean up and see what is written on the top.... I can see some writing suggesting its a resistor.

Also remove the component and see if you lose the short

[dellxps15]

Re: Blown capacitor? on acer 7739

for me
C575
1500p/3KV_1808
as it's the only one big category 1808. all other are 0402 or 0603 or 0805.

[rippergr]

Re: Blown capacitor? on acer 7739

Firstly while I download the schems for it... Give it a clean up and see what is written on the top.... I can see some writing suggesting its a resistor.

Also remove the component and see if you lose the short

I try clean it but it totally messed up (maybe its a resistor). I also removed it but the short still remains

[dj_ricoh]

Re: Blown capacitor? on acer 7739

Same schematic? Toshiba c855 with acer?

[rippergr]

Re: Blown capacitor? on acer 7739

Its a hannstar e89382 so I think it's the same.

[rippergr]

Re: Blown capacitor? on acer 7739

Can someone tell me how can I trace the short to ground? How to start?

[rippergr]

Re: Blown capacitor? on acer 7739

I removed a mosfet near the power jack wich seemed suspicious. When I measure it on circuit it shoes circuit in both sides. When I remove it the short circuit to ground dissapeared so I am thinking the problem is that mosfet. It's a FDS4435BZ. I am waiting for another to change it but I still can't find what is the component that blow off.

[rippergr]

Re: Blown capacitor? on acer 7739

I think that this schematics are not for this laptop. It maybe the same model but I can't find anything matching. Can someone give me correct schematics for this laptop? It's the worst laptop motherboard I have ever seen. There is not one component name typed on motherboard you must guess all components.

[meritosari]

Re: Blown capacitor? on acer 7739

schematic:

[rippergr]

Re: Blown capacitor? on acer 7739

Thanks meritosari for the schematics, although some pages are blank like 63 which is the dc power and others. Has anyone repair such motherboard , there is no text near the components so I can trace or identify them. Is there any way to find the blown component?

[meritosari]

Re: Blown capacitor? on acer 7739

i've found image from russian forum:

its really difficult work on asus or asrock/pegatron cause board have no pcb marking, except you have the boardview. sadly can't find anything on web about that

[reizal]

Re: Blown capacitor? on acer 7739

Acer Aspire 7739 Pergatron AIC70 Schematics

[rippergr]

Re: Blown capacitor? on acer 7739

Thanks reizal , this is the same schematics meritosari gave me.
This is the most crap motherboard I have ever seen. It's ottaly blank except some jp and conn markings.

[rippergr]

Re: Blown capacitor? on acer 7739

Merisotary that's great picture you gave me. its exactly the spot I have the problem. so the missing component is a zero ohm link.
Thanks again.

[rippergr]

Re: Blown capacitor? on acer 7739

I changed mosfet and the zero ohm link but the laptop is still dead.
Any ideas what to check next?
PS. The short to ground that I had now dissapeared.

[meritosari]

Re: Blown capacitor? on acer 7739

19v, 5v and 3.3v already steady?

[rippergr]

Re: Blown capacitor? on acer 7739

in which chip should I measure those voltages?

[rippergr]

Re: Blown capacitor? on acer 7739

Anyone has any ideas?

[meritosari]

Re: Blown capacitor? on acer 7739

what voltage you got ?(i attached image)



and power button had 3.3v? or bios pin8 had 3.3v?