acer aspire 6930z power problem

[ala_borbe]

hi all

a have aspire 6930z mb: DA0ZK2MB6G0 rev:g

and it will not turn on neither battery nor DC... when connected blue charging light come on, all voltages seems present but when power button is pressed nothing happens except blue charging light come off... no fans spinning, no nothing... i have to disconnect and wait 10-15 sec and reconnect dc and blue charging light came back on...

no visible damage, and mosfets seem to be ok, diodes and usual stuff checked...

i have stripped down everything including cpu and ram and symptoms remain the same...

any help o guidance will be much appreciated

[spidey]

Re: acer aspire 6930z power problem

flash the bios first.

[Francisco.s]

Re: acer aspire 6930z power problem

As spidey says try the bios first, also check peak current consumption from 19v. rail. (could be a secondary power supply drains too much power)

[fddizon]

Re: acer aspire 6930z power problem

have you tried removing cmos battery and replace with new one?

[jtamad44]

Re: acer aspire 6930z power problem

if its amd try to replace the rtc battery.. if its still no go, flash or change the bios chip.

you can check also the clock generator..

[ala_borbe]

Re: acer aspire 6930z power problem

thank you for your replays

its an intel cpu...

yesterday i was struggling with my old willem eprom programmer pcb 3.b wich gives me hard time programming spi eproms larger than 1mb (fin future i will mod it to pcb ver 4.5) but i have managed to do so... only one bios at Acer support site, flashed, soldered eprom and now symptoms changed... would not turn at all, no reaction on power button... found some older version an acer ftp site, so i will program it again today...

i will report my progress...

[ala_borbe]

Re: acer aspire 6930z power problem

i have flashed this bios

ftp://ftp.support.acer-euro.com/note...30/vista/Bios/

and now charging light is on, power button has no reaction at all...

i also tried
http://global-download.acer.com/GDFi...CER&SC=EMEA_27

and same thing...

flash done correctly (unsloder, erase, check blank > ok, write, verify > ok, resolder to motherboard)

any ideas...

[spidey]

Re: acer aspire 6930z power problem

check EC and south crystalls, if they are good, check for lid and acin signals coming to EC. Also check power button 3.3v and while pressing goes down to 0v. if all ok, then change EC.