How to repair HP DV9500 No video..... -
07-05-2012, 06:08 AM
Hi my elakiri friends.... I hope this is my first useful thread...I wanted to show this cause there two elakiri friends who suffer with this problem...
So do this at your own risk.....
We got a HP dv9500 disordered Graphics cause after 2006 all electronic components soldered by lead free solders... these are not much heat friendly and they will crack with time... so what we doing here is called REFLOW...
Ok Now remove the battery and memory and hard drive bays... In this laptop we got 2 hard drive bays as this is 17" system...I bought this without the hard drive so there are no hard drives inside....
Remove the screw which is indicated for the DVD writer and pull it out from the system as in below picture
Remove all the screws visible plus remove the RAMs WI-FI card as also the screws on the hard disk bays as shown
Now remove the plastic where the media touch buttons are... and carefully remove it's ribbon..
Now remove the keyboard screws and take it out from the system as shown
Now carefully remove all the ribbons and wires from its connectors
Now let's remove the laptop screen by unscrewing these screws..
Now it will look like this
Now remove this plastic strip very carefully by removing this screw and pull the plastic strip very carefully
Now finally take this power button from the heatsink...its not necessary but let's do it anyways
Now this is the view we are getting
Remove all the screws I have highlighted and take the pcmcia card slot and also the DVD connector..And also remove these wire and the ribbon shown from their connectors
Remove the Heatsink screws shown below
Before pulling the motherboard check any screws.. unscrew them and pull the motherboard slowly while doing it remove these cables shown
Now turn the motheboard other side and remove the heatsink
I'm using thermal compound remover here I hope you can get it in Pettah... What we do here is clean the old thermal compound.. apply little on processor and heatsink and leave for like 2 minutes
And now clean it with a soft cloth and it has to look like this
The equipment below shown is a heat gun.. It's a pain stripper... this is not the professional way I do is but this is the only way we can use at home....
The air temperature is 400c in this air gun so I'm heating the video chip NOT MORE THAN 20 SECS
If you don't have an air gun you can use the oven... wrap the motherboard fully and make an open where the nVidia chip is..Select the temp for 200c and Preheat the oven for 20 mins.. Switch off the oven and leave the motherboard there for 10 minutes....
Whatever method you do you MUST leave the motherboard to cool down for 50 minutes
Now apply the thermal compound on Processor, Video Chip and on northbridge
Now use two copper shims on top of the video chip and northbridge chip..
we use this cause these copper shims will conduct properly with the heatsink and transfer the heat more than before, also it applies a little pressure on chips so there are less chance that the chip becomes lose..
Now fix the laptop carefully and don't ever mix the screw sizes.. it will damage the base and the plastic...
Now I'm installing Windows 7
sorry for not posting this thread in sinhala cause it's really hard to type my friends.... Hope you will get something from this and I will post more posts about laptop repairing...
This method can be used on faulty nVdia and ATI graphics cards but this is not the proper way to do it. This might last long or sometimes it won't
So I will show you the proper way to reball the chips but we need a rework station for that... I know we don't have that at home so this is the only option.....