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770Z fried w/universal ac adapter set to 22Volts by mistake
Posted: Mon Feb 19, 2007 9:50 pm
by elportugues
Components damaged:???
DC-DC Card?
CPU Card?
Modem Card?
Video Card?
Standby Battery?
LCD Unit?
Please advise.
Thanks,
Posted: Mon Feb 19, 2007 10:14 pm
by rkawakami
If it's any help, my experience has been that the fuses are probably good and that one (or more) of the integrated circuits have blown first (protecting the fuse
).
If you can open it up, check the fuses with a multimeter, visually inspect all parts for any obvious signs of damage, and if seeing none, try to use an adapter set at the proper voltage and see if the laptop returns to life. There are many possibilities of damage. I would say that most of the removable components (CPU, memory, any other daugther cards) are probably okay. With major overvoltages, the problem is usually a part on the motherboard.
770Z Fried
Posted: Tue Feb 20, 2007 6:54 am
by elportugues
I change the motherboard-No Luck!
Change DC-DC Card-The fan works, nothing else!
Re: 770Z Fried
Posted: Tue Feb 20, 2007 7:48 am
by cmarti
elportugues wrote:I change the motherboard-No Luck!
Change DC-DC Card-The fan works, nothing else!
Are you able to enter into the BIOS?
770Z Fried
Posted: Tue Feb 20, 2007 8:37 am
by elportugues
Not able to enter into Bios!
Re: 770Z Fried
Posted: Tue Feb 20, 2007 7:38 pm
by cmarti
elportugues wrote:Not able to enter into Bios!
Try this:
Remove both batteries and press the power buttom for ten seconds then star the machine without the cmos battery, see what happens. Maybe this reset the BIOS, same thing happen when i upgrade the mobo form my previous T40.
770Z Fried
Posted: Wed Feb 21, 2007 5:17 am
by elportugues
Nothing happens.
I have another 770Z working. I am going to test board by board on the one that is working. Any suggestion accepted!
Re: 770Z Fried
Posted: Wed Feb 21, 2007 8:48 am
by lenmullen
elportugues wrote:Nothing happens.
I have another 770Z working. I am going to test board by board on the one that is working. Any suggestion accepted!
This is the right idea. Change swap each part into the working unit to see what parts are bad. It's possible that two parts are bad. You will figure our which faster swapping one at a time into a working system.
Re: 770Z Fried
Posted: Wed Feb 21, 2007 8:58 am
by cmarti
elportugues wrote:Nothing happens.
I have another 770Z working. I am going to test board by board on the one that is working. Any suggestion accepted!
Now i remember one thing, when i first replace the 366mhz cpu from my 770Z with a 500mhz when i started the lappy it was just running the fan nothing else, the problem was that the cpu wasn't seated correctly i remove it pressed it a little harder and problem solved! It may not be your case but..who knows?
