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GA-H77M-D3H i7-3770S "electronics" smell after 10 days -- any ideas?

post #1 of 3
Thread Starter 
My build:

GA-H77M-D3H(rev. 1.1), i7-3770S, not overclocked, BIOS: F9
no video card, 120GB SSD (no hard disk), no add-on cards
Crucial 8GB (2x4GB), 1600 (8-8-8-24)
Seasonic SS-400FL fanless power supply
Cooler Master Hyper 212 Evo cooler (using one push fan)
Silverstone PS07 case (using just one of the two front case fans, at low speed), Win 7 64-bit SP1

After running more than 10 days (24 hours a day at full load), the motherboard is still emitting an irritating "electronics" smell.

Idle core temps (via Realtemp) are about 27C; full load core temps max at 64C (well under 103C, which I believe is TJ Max for the i7-3770S).

The memory cards are cool. The blue (Northbridge?) heatsink is warm to somewhat hot to the touch.

No smoke, but the smell eventually fills the room, and is slightly caustic.

The main source of the smell is coming out the lower back of the case, from the exhaust of the heatsink fan, which pushes air through the heatsink, and then comes out of lower back vents of the case.

A very small odor is coming from the (fanless) power supply, which vents out the top of the case. I don't think the power supply is the problem.

Total input power (measured by Kill-a-Watt) is 27W at idle, and 96W at full (Prime95) load.

The smell is more obvious at full load -- and dissipates only after the computer is turned off.

To eliminate the heatsink fan as a source, I removed it and ran the system at 30% load (resulting in max temps of 65C). Same smell.

Two theories:

1. The smell is coming from the motherboard. If so, for how long, and can anything be done?

2. The (heated) thermal paste is giving off a smell. (I applied a "pea size" amount.)

Cooler Master says that neither the paste nor the heatsink is producing an odor -- and that the problem is probably a bad capacitor.

I can see all the capacitors, and they show no signs of leakage or cracking. Also, the board has performed properly so far (no crashes or blue screens).

Gigabyte has not yet responded to my support submission.

As the temps at full load seem good, I'm reluctant to reapply thermal paste -- but will do so if necessary.

Suggestions?

P.S. On the bright side, the system is both cool and quiet.
post #2 of 3
You got another PSU you could try out? see if smell goes away?
Le Box of Black
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Le Box of Black
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 930 Gigabyte X58A-UD7 r2.0 GTX 770 16GB Corsair Vengeance in Triple channel mode ;) 
Hard DriveHard DriveHard DriveHard Drive
Ocz Vertex 2  Samsung F1  Samsung F3 Samsung F1 
Optical DriveOSMonitorKeyboard
Sammie Dvd rw Windows 7 64Bit HZ281HPB 1200p / HP IPS 1080p / Samsung Syncmas... Qpad MK80 (Blue switch), SteelSeries 7G (Cherry... 
PowerCaseMouseMouse Pad
HX1000 CM-Stacker 832 Flipped Naos 3200,G5,G400,G400s, G300, Kone+ Razor Destructor and Steelseries Qck 
AudioAudioAudio
X-Fi Fatal1ty  ATH-T500 / AH-D510 Samson CO1U PAK Condenser Mic  
  hide details  
Reply
post #3 of 3
Thread Starter 
Quote:
Originally Posted by superj1977 View Post

You got another PSU you could try out? see if smell goes away?

The reason I think the (Seasonic fanless X-400) PSU is not the source is that both its vented sides (top and back) face the outside of the case (top and back), relatively far from the CPU fan which is near the bottom-rear of the case. There is hardly any smell coming out of the two PSU vents. But there is a strong smell in the air coming out of the lower back of the case, propelled by the heatsink fan.

When I first powered up the system (about 10 days ago), there was a smell coming from the PSU, which reduced day by day, and now it's barely noticeable (with my nose right at the vents). But the air coming out of the lower back of the case has a strong smell.
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