How to deal with HP DV2000 laptop GPU overheating

1)One long beep and two short beeps indicates that the GPU chip is not working.2）I opened it up myself and found that the thermal pads on the CPU and mainly on the GPU had seemed to be making poor contact. The GPU contact in particular is rediculously bad – it has a paste type stuff that is about 2mm think and then the heatsink on top of that. I replaced everything with artic silver. Mine now works 100% everytime and doesnt get as hot as it used to do.3）I have found that the GPU gum between the GPU and the heatsink is meant to fill about a 2mm gap, but the gum dries out and cracks. When this happens the chip overheats, and the BGA pins on the gpu loose there connection. If you leave the power on after the beeping and block the vents a bit, the GPU/CPU heat sink warms up enough to expand the solder on the BGA pins and make a connection and the laptop will run. But eventually the solder will fully fracture, and a ball may come off and then you are totally stuffed.Fixing the heat sink does not fix the problem – its the cause of the problem though, so if you do get yours fixed, I would recommend opening it, scrapping off the blue gum, and inserting a 2mm peice of copper plate on-top of the GPU and using siler thermal paste to connect the GPU to the copper plate and then again on the other side to connect to the heatsink. But this won’t fix it if its already dead. (I tried it and I get the same long beep, two short beep).To fix the problem you have to re-flow the solder on the BGA. This should be done as a last resort (after your laptop doesnt turn on any more even when you heat it up). You have to strip down laptop to the motherboard. Bake the motherboard in a fan forced over at 80 degrees celcius for at least 24 hours (to get rid of any moisture that might be in the chip or solder). Immediatly after you take it out of the over, you need a hot air gun capable of reaching about 300 degrees. Heat the entire GPU chip and its board (don’t worry – all components can take 300 degress celcius for solder-reflow and did when the board was made). Keep bumping the GPU chip very slightly with a small screw driver, it will eventually become loose. Don’t lift it up however. Just keep the heat on for a few seconds to let the solder reflow and make a connection with the balls underneath.
After that let it cool down and plug everything back in and it *Might* work. If not can you heat it up and try again.HP should never have used a BGA chip for the GPU. Its rediculous considering how hot the chip gets. I think nvidia are partially at fault as well – the 7200 uses to much power to be a bga chip.
Goto the HP website and download the repair manual. It will tell you how to strip down to your motherboard. Take out the CPU and the heat sink fan assembly. Take everything connected to the motherboard off. Take out the RAM. Bake the motherboard in an oven at 80 degrees celcius. The older your board the longer you should bake it. I baked mine which is 16 months old for 16 hours. The actual recommended time is 24-48 hours if you want to be really safe. The point of baking is to remove moisture that might be in or around that chip that can explode if you heat past 100 degrees.
Next use alcohol to squirt under the nvidia GPU chip. Let it dry and squirt under there with solder flux. Place a light weight peice of metal on the GPU chip to weigh it down (I used a 10c coin),\. Next use a thermoeter and a hot air gun to heat the GPU chip to 190 degrees celcius. This is the reflow temperature of solder. At this temperature the little connections under neath the chip (the ball grid array) will go molten and reconnect. The idea is to heat it slowly till about 195, then thats it. Take the heat away and let it cool down and it will run.
MOST IMPORTANT TO ANYONE WHO FIXES THEIRS, EVEN IF HP FIX IT:The problem is caused by dust clogging in the heat sink assembly. Unfortuently you can only get to the dust by removing the fan, to remove the fan you must remove the heatsink. To remove the heat sink you have to re-apply thermal paste to the GPU and CPU, not to mention stripping your entire laptop down to access the motherboard. So if you don’t want yours to fail again, make sure to strip it down and take the fan off the heat sink and clean the dust out at least every 6 months. The laptop should NEVER get to hot to touch. If it is you almost certain have dust clogging the air flow. Inside the heat sink up against the copper cooling blades you will find they are clogged with dust. If you keep it free it of dust it never over heats.The GPU itself is not overheating and failing, this is probably why the PC happily runs and does not thermally shut down.
Whats happening is, because there is a gap filled with thermal paste, as the GPU gets hot, the solder is allowed to expand, as the heat sink is not locking it down. Instead the GPU moves upwards as the solder expands bh it and pushes the thermal gum away. Then when you turn it off, the gum sort of holds the GPU up against the heat sink, so the solder cools and has to pull the GPU chip back down. Eventually this causes the solder to fracture, as they are continually being pushed and pulled on. It doesnt happen on the CPU because the CPU is screwed directly onto the heat sink. Where as the GPU has that 2mm gap filled with blue heat gum.This is an obvious design error. The way they have a 2mm gap filled with gum is rediculous. Even if they fix it, it will happen again and again and again. Other message boards have had people who have taken there back 2 times or more now.
Fixing the dust will probably just prolong the time until it fails. I stronly recommend to remove the gum and use a 2mm plate of copper. Use thermal silver on each side. btw im electronics engineer and it still took me ages to figure out exactally what was wrong. You might have to grind down the copper to the right size. If it is too big, the heatsink my not clamp down on the CPU/GPU, if its to small it may slide out.
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Tags: chip, fix, GPU, overheat