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Asus G50VT Power On Issues with GPU

post #1 of 16
Thread Starter 
UPDATE: New power brick did come in. It still doesn't work. It must be the GPU.

UPDATE 2: I tried two bakes on the GPU (375 and 400 degrees). No dice. To summarize what I know now:

Laptop will not not power on with the GPU in the pcie slot (fails at POST). It WILL power on without it, but I don't get any (obviously) display output.

Okay, this one has been bugging me for a long time, and I've searched all over this forum and Google for answers, but to no avail.

A long time ago I inherited a broken laptop from a friend, the ASUS G50Vt (Best Buy). To get to where I am today, you'll need to follow something of a narrative. I'm sorry it's of length, but it describes my issue at full length. If you wish for a summary, skip to my +'s and -'s:

I plug in the laptop (with a reinserted battery, or no battery). The PowerGate LED lights up, indicating that some form of power is reaching the laptop. When I push the power button, it makes a half second (more like 2-tenths a second) to power on (the LEDs all light up), so I think that means it's failing at POST. What's interesting about this is that the LED on the power brick goes out at the same time, and so that must be a safety feature or the problem itself.

A disassembly later, I notice that once I remove the GPU (MXM 9800m GS), the laptop actually powers on and stays on! Obviously it's rendered useless, because there's no onboard graphics processing, but the point is the issue has been seemingly isolated to the GPU, right?

WELL! That was a long time ago. The laptop remained untouched for the whole of nine months until a couple nights ago when I pulled it out to test again. Lo' and behold, to my greatest surprise the damn thing turned on and booted into Windows! I toyed around with it for a few hours while in the desktop environment. I could've run benchmarking software, but I instead decided to give it the Starcraft 2 treatment, and I got through the first single player mission successfully (albeit with graphics issues from super outdated nvidia drivers). A bit later, I decided to play the second mission, and this is where things went awry again.

Mid mission 2, the laptop just shut off on me. I thought it had overheated, but it turned on again no problem. I then noticed that once I hit windows I was on battery, and once again the power brick's light was out. I unplugged/replugged the brick and it gave me power again, but it must've gone out again soon, or I left it unplugged from the laptop itself (I cannot remember this detail). The point is I was briefly powered on from the battery alone (which I didn't expect to mean much, because it had been unused for nearly a year).

Suddenly, I was back to square 1, with the original symptom. So to summarize why it could be and couldn't be the two highly suspect players in my tragedy:

+ = reason for being issue
- = reason against being issue

Power Brick:
+The LED indicator light keeps going out when I try to power on the laptop
-It /did/ turn on the laptop for a few hours.
-My laptop does turn on when the GPU is removed with this power brick.
-My plug bit fit into my friend's Acer laptop with the same power ratings, and the brick seemingly gave no fuss about it. His bit was too small for my ASUS to test.
-My friend said he took it back to Best Buy way back in the day, and the store rep let him plug it into one one of the model's laptops. Laptop still didn't power on (but I am unsure if they did their testing properly. I don't trust his technical prowess, nor Best Buy reps. They might've not tried removing the battery, which seems to be some sort of safety thing with Asus)

GPU:
+Laptop turns on when the GPU is removed
-Laptop randomly turned on for a few hours and demonstrably WORKED with the GPU plugged in. Ran SC2 (with the only issues being really old Nvidia driver render issues)

I think that's basically everything I know about my problem. I was so certain for so long that it was the GPU, up until a few days ago when it actually worked. But the power brick worked, too!? The whole thing worked, for that matter!

Anyhow, now you can see why I'm so damn torn about this. I ordered a replacement power brick from eBay, and it should be here soon, but I'm just not sure. So if anybody has any ideas or suggestions, please send them my way!
Edited by FloatingDinosaur - 2/24/11 at 4:43pm
post #2 of 16
Thread Starter 
UPDATE: new power brick is in. It didn't work. So it HAS to be the GPU, but whatdoido now? frown.gif
post #3 of 16
I know it's probably of no help but I have the same exact symptoms. You saved me from buying a new power brick for testing.
post #4 of 16
Thread Starter 
I'm gonna bake the mobo later tonight to reflow the solder joints (in a couple of hours), so stay tuned and I'll let you know if that works.
post #5 of 16
Nice. I was thinking about baking the GPU as well.
post #6 of 16
Thread Starter 
Welp, baking the motherboard did nothing for me, either. Now I'm genuinely at a dead end.
post #7 of 16
this is unfortunate, I just got my Asus G50vt too, sorry to hear that.
Dell Optiplex 745
(10 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 (incoming) Dell proprietary Intel Q965 Express Chipset XFX HD 5770 (incoming) 4GB Patriot DDR2 800 
Hard DriveOptical DriveCoolingOS
Hitachi Deskstar 160GB 7200RPM DVDRW Stock Windows XP 32 (for the time being) 
MonitorPower
Dell 22" 1680x1050 Corsair CX430 
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Dell Optiplex 745
(10 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 (incoming) Dell proprietary Intel Q965 Express Chipset XFX HD 5770 (incoming) 4GB Patriot DDR2 800 
Hard DriveOptical DriveCoolingOS
Hitachi Deskstar 160GB 7200RPM DVDRW Stock Windows XP 32 (for the time being) 
MonitorPower
Dell 22" 1680x1050 Corsair CX430 
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post #8 of 16
Thread Starter 
Quote:
Originally Posted by INdescript;12514778 
Nice. I was thinking about baking the GPU as well.

Although I don't wish to discourage you, I am not hopeful for the bake route. By this point, I basically conclude that the mobo is just dead, and the only solution is a replacement mobo. That's only a guess, I'm obviously not 100% sure.
post #9 of 16
You'll be able to see if the solder is broken somewhere anyway, and then all you need is a soldering iron and some luck to get it to make contact again. I have the same laptop, banged it around quite a few times and it's still going strong. Love it.
Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 Gigabyte GA-EP45-UD3P Sapphire 5870 Cypress XT EF6 2GB 4GB (2x2GB) G.SKILL 1066 
Hard DriveOptical DriveOSMonitor
32GB Corsair SSD + 2x 320 + 1x 250 Lightscribe drive Windows 7 Ultimate Hanns-G HG-216DPO 
KeyboardPowerCaseMouse
Logitech G15 Gaming Keyboard OCZ GameXStream 850W HAF 932 Logitech G5 Laser Gaming Mouse 
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Allsop 
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Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 G0 Gigabyte GA-EP45-UD3P Sapphire 5870 Cypress XT EF6 2GB 4GB (2x2GB) G.SKILL 1066 
Hard DriveOptical DriveOSMonitor
32GB Corsair SSD + 2x 320 + 1x 250 Lightscribe drive Windows 7 Ultimate Hanns-G HG-216DPO 
KeyboardPowerCaseMouse
Logitech G15 Gaming Keyboard OCZ GameXStream 850W HAF 932 Logitech G5 Laser Gaming Mouse 
Mouse Pad
Allsop 
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post #10 of 16
I have the exact same laptop. It was too big of an investment so i just cant throw it away. Which part did you solder exactly?
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