Huawei P10 review
RELOW YES OR NO ?
THE PROBLEM WITH COMPAQ AN HP AND IBM ECT LAPTOPS..
any one tryed the at home reflow did it work ? ie :- bake the motherboard for 24hrs, use a heat gun to reflow the solder ?
You won't catch me sticking my Sony Laptop in an Oven on Regulo (Gas Mark) 7 for 24 hours.
18 Kilo of Rhino Rump yes, Computers, NO.
Maybe Sony just make better Laptops thnm yours ;-)
Not something I would try with my HP lappy, have you got a link to where you heard this info.
Sounds awfully dodgy.
One long beep and two short beeps indicates that the GPU chip is not working.
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.
I have many of these defective units in our repair shop. To investigate the iddue, we removed one of the chips and found that they indeed have come loose from the board. The problem, as stated by others, is that the Nvidia GPU becomes hot, the lake of a proper heatsink will not wick away the heat fast enough and if we are teamed up with an AMD processor, the heat is multiplied. (AMD processors are much hotter than the Intel, which is why the AMD units fail more quikley than the Intel) We have sucessfully replowed all of the boards that we have and they all function normally now. Keep in mind, the solder under these chips are just small balls of solder and the chip never really touches the board, the ball grid of solder is inbetween. If the chip heats to the point to melt the solder, the grid pulls away thus no video. We use a common toaster oven to serve as the reflow oven. We set to 300F degrees for 20 minutes. If you use a heat gun, you can press down on the chip some but it's a very bad idea to press don;t on the chip when you use a reflow oven, you risk "squashing" the solder out of the grid and you're work will then go into the trash. Just cook it and let it cool after the 20 minutes so that the chip can settle back in. Then add a nice hunk of copper under the heat pipe / heat sink when you put it all back together. A copper penny would do if you have no other means. But epoxy it on so that it doesn't move.
Used the blanket trick on a DV2000 and it worked, has been months since, still works.
Used the heat gun trick on a DV6000, it worked on the third try, well fourth if you include the failed hair dryer attempt.
After both times the laptop tends to run hot all the time, maybe because I didn't put the black plastic back on?
I have done the reflow twice now. I restored video , kind of. I can see a picture but its very dark. Did the video chip go out? Do I need to replace the board now? Any advice on the next step would be appreciated.
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