acer aspire 7750g dead

[nucleus]

board is completely dead. no voltage on any coil. there is no voltage after second fet (1v), but fet is OK. could someone help me. no voltage to battery connector or charging and 5v/3.3v chip

any help is appreciated

[fddizon]

Re: acer aspire 7750g dead

check resistors, capacitors and transistors connected from gate pin of the second FET.

[koresi]

Re: acer aspire 7750g dead

check resistance between ground and and main voltage(after second fet).could be a short,if it is then check mosfets on cpu powr suply.

[nucleus]

Re: acer aspire 7750g dead

check resistance between ground and and main voltage(after second fet).could be a short,if it is then check mosfets on cpu powr suply.

no it is not shorted, I checked. It seams everything is normal

[koresi]

Re: acer aspire 7750g dead

what is the voltage on secondary fet gate?

[dondrusco]

Re: acer aspire 7750g dead

I had the same issue. Does the board 'tickling' - all MOSFET-s?
I found one pair of MOSFETs shorted. I cannot find a new pair of BSC057N03MS.
I try to replace with 7876 - just for test.

[fddizon]

Re: acer aspire 7750g dead

Nucleus,

check gate pin of 2nd FET...