Dell l502x

[Tomas9t1]

Hello there, so today I think I broke a laptop, I have DELL L502X with I7 and it had faulty HDD and USB 3.0 connections, so I replaced connection, insert new HDD and now whenever it gets power the fan start spinning at full speed, but no video, no reaction to power button, what could have I broke Southbridge? Northbridge? It doesn't matter even if i take out cpu and RAM it still starts spinning, tried changin different CPU, RAM, but no luck :/

[Tomas9t1]

Re: Dell l502x

http://www.4shared.com/file/pZqrLi12ba/dell_l502x.html here's my EC dump

[newtothis]

Re: Dell l502x

Don't use 4shared, It full of ads!

Any shorts?

[Tomas9t1]

Re: Dell l502x

http://www.4shared.com/file/07bIixPF...502X_bios.html bios dump , I won't use it in future No shorts found, already changed Southbridge, as the northbridge is in nVidia...

[dellxps15]

Re: Dell l502x

http://www.4shared.com/file/07bIixPF...502X_bios.html bios dump , I won't use it in future No shorts found, already changed Southbridge, as the northbridge is in nVidia...

wrong; nvidia is gpu,while intel is northbridge and southbridge.

did cpu and gpu get hot ?
voltage on cpu and gpu after power on ?

[Tomas9t1]

Re: Dell l502x

nope, nothing get's hot... strange thing is that as I plug in charger the charge baterry indicator lights up after good 6seconds fan automatically starts spining at full speed, ant it doesn't react to power button at all...

[Tomas9t1]

Re: Dell l502x

As I already reballed GPU, changed northbrdige/southbridge, flashed bios and EC, I will try replacing KBC chip

[Tomas9t1]

Re: Dell l502x

KBC replacement helped! As the USB ports where repaired I think there could be the problem... http://s18.postimg.org/v74tpybqx/111...91965195_n.jpg At the component LI 3 and 4 has short and 1 is shorted to 2, 1 to 3 has 996ohm and 2 to 4 1185ohm

[dellxps15]

Re: Dell l502x

read voltage on cpu and gpu coils when pc is powered on.

does any light blink indicating the error ?

[Tomas9t1]

Re: Dell l502x

Finally got it working!!! Thanks all for help !

[dellxps15]

Re: Dell l502x

what was the problem? bad usb part ?