Re: Another: Laptop Dead Except for Lights and Fans Case. Is it BIOS?



There are CPU and RAM voltages in my case....

Re: Another: Laptop Dead Except for Lights and Fans Case. Is it BIOS?

Follow up.
Unfortunately the BIOS ROM chip 39VF080 seems to be damaged. (It refuses to get programmed)
I am having hard time finding it, so I am considering to order it online.
However, I am not even sure that it is the only culprit and replacing it would cure the problem. If there are bigger problems then buying it might turn out to be a waste.

Re: Another: Laptop Dead Except for Lights and Fans Case. Is it BIOS?

I swapped the cpu: no progress.
Since I bricked a GPU in my previous attempt at reflowing, this time I am not in mood to do reflowing unless its the last option. So, how likely is it that GPU is fine and problem is with erased bios rom? How do I check if the bios is working properly?Is it possible that if I use a scope to sneak some signal lines I could tell if the problem is with BIOS or GPU?

I Have another dead laptop case: Its acer aspire 5580. When I press the power button, lights glow fan spins but nothing on display (both internal or external display). No symptom of life.
I thought It has problem with Display processor and needs reflowing but someone suggested it could be BIOS as well?
Well, How can I check whether its BIOS problem or not?

Re: Laptop Dead except for the lights and fans.


Well, I did remove all removable parts, including CPU. I did use aluminum foil to protect other parts. I practiced reflowing in a scrap desktop mother board before trying on this one.
There were like three small globs (of size comparable to solder ball)of black things on each corner of the chip. I believe they are some kind of adhesives to keep the chip on place. I tried to scratch them out before reflowing but they were hard, so I couldn't. I thought they will just melt away when I do reflowing so moved on. But even...

Re: Laptop Dead except for the lights and fans.

Rflow and Kaboom!
It won't even light the LEDs now. Completely Dead.
Someone please help.

Re: Laptop Dead except for the lights and fans.

Thank you all.
Yes, reflowing (or reballing?)the nvidia GPU seems like the only solution. I checked the Vcc_core voltage and it was 1.5Volts.
What I am wondering is, in the schematics, I can see that the Power led can *only* glow when the GPU wants it. (i.e. it is connected to one of the GPU pin, or atleast controlled by it.) So, if GPU was disconnected from the pads, then the LED shouldn't have glown either.
But, maybe only some of the GPU pins are disconnected, and those that are required to glow the Led are...

I had this compaq presario v3500 model laptop running fine. But yesterday, It suddenly won't start. When I press the power button, the fan runs, the power leds (on the motherboard and on the power button) lights continuously and nothing happens. It remains like that for eternity. .
Doing 'HARD RESET' don't solve the problem, neither does playing with RAM. In fact, even when I remove RAM and Harddisk, the poor thing can't even complain (no blinks or beeps).
No its not display problem, even when leaving it for hours, the CPU is dead cold.
(if it were only the display then, cpu...