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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2010, 10:28 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

Turns out the tiny black thing is 0ohm resistor - i found many of those populated throughout the MB PCB. I resoldered one from the card reader (non-critical for me) and tried to boot with no avail.

As there was still goop around the whole thing, i will desolder and examine the larger cap beside it. Hopefully i will find the failure there

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

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03-03-2010, 12:35 PM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

I think i got it! I followed the traces with my multimeter and found that after going through one more tiny cap on the other side of the board, this cap connects to ground - so there is a high chance that this is a decoupling/coupling cap to ground the IC.

If the ic can't get proper reading about ground condition, it would make sense that it refuses to continue working after initialising.

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

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03-03-2010, 06:30 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

By the way Toasty, thanks for the tons of support.

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-03-2010, 06:29 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

I'm not totally sure if i shutdown properly because I fell asleep that day. Could have been an "abnormal" shutdown.

But in any case, one capacitor has desoldered and delaminated, so i assume it was thermal stress.

With just the power brick connected, i still don't get a charge indicator LED, but doesn't seem to stop me from booting briefly.

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-01-2010, 03:27 PM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

Hi Toast,

I tried on another power brick - no luck.
It powers on for a second, displays boot stuff and then powers down. Same on battery. When i plug in the AC, i don't get the usual LED to light up - obviously something is wrong with the power management IC. I traced the paths to the IC - the big cap lands onto what seems to be pin2 on the package, other end connected to common ground. The smaller cap is connected to a thick trace, running nearby, wich makes a short "bip" when i measure it to ground. This...

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-01-2010, 06:28 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

Thanks Toasty. I tried scraping the edge of the cap, i got it shiny and it still doesn't want to tin - amazing! I'm starting to think that the metal laminate fell off. Any tinning tips or something else?

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

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02-28-2010, 02:46 PM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

I wasn't able to solder the black cap back =/ One side tins perfectly the other doesn't want to catch at all - any tips?

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-28-2010, 02:51 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

Well when i was poking around with the Q-tip and isopropyl, i noticed that the smaller cap is loose (the one with the "horn") and it came off the solder pad with a gentle nudge, thankfully leaving behind the shiny copper solder pad intact. I touched the other, bigger cap with my soldering iron, and added a drop of solder to reinforce the contacts. It did give of a faint nasty smell, but I'll try to resolder the tiny cap and boot.
Toasty, what if the caps are tantalum? Can they fail like this?

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wheezardth replied to ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-27-2010, 03:40 AM
Re: ASUS M50VM\X57Vn IT8512E Filter? Caps

Honestly, i was quite curious to see SMD caps in such a dire state. I cleaned them up with some isopropyl and i really can't fathom what could make such goo mark, exactly around those two caps. It had a glue-like consistence after it got dissolved. I'll try to POST today, after i put everything back together, but the caps still seem damaged.

Thanks fot the feedback Toasty! Any suggestions for further testing?

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wheezardth started a topic ASUS M50VM\X57Vn IT8512E Filter? Caps

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2010, 04:24 PM
ASUS M50VM\X57Vn IT8512E Filter? Caps

Hello everybody at Badcaps.net!

I have quite a specific problem with my Asus X57Vn (M50VM) notebook. After a bog-standart shutdown, my notebook never wanted to completely POST. It starts, and after a couple of seconds it just powers down. AC indicator does not light up no matter if the cable is plugged in or not, and battery does not seem to charge.

After taking the laptop apart, suspecting the barrel jack connector to have desoldered (it had not), i found two leaked SMD caps near the [URL=http://www.ite.com.tw/EN/products_more.aspx?CategoryID=3&ID=6,81][B]ITE...

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Last edited by wheezardth; 02-26-2010, 04:29 PM.