I accidentally knocked motherboard resistor

[ARIF]

Hello, i am new to this forum i need help so i came here today i was installing a new cpu fan so i want to remove the old fan so i was removing the socket of cpu fan but that was too hard to remove so i used a screwdriver to shift the cpu fan pwm socket but unfortunately i just knocked a small resistor which was near to pwm fan header i was in shocked i thought i killed the motherboard but fortunately everything was working without that resistor but i am in worry that it would be a problem in future. So please answer

 

[pcgeek11]

Hard to say conclusively if it will effect it or not. Chances are if it boots and runs and you haven't noticed any problems it will be fine.

It could result in a shortened life of the motherboard due to a voltage regulation problem or filtering etc...

 

[ARIF]

There is no problem right now
pc is running fine i have played games seems to be ok. The resistor was i think of pwm or fan voltage which may control overvoltage or overcurrent.
I have that resistor right now but it's too small to be soldered. Should i sold that?

 

[pitz]

You'd need the schematic of the board to be sure, but resistors are often used in digital systems to pull up certain inputs, to ensure a certain state upon power cycling (ie: as a RC circuit) or to limit current. They are also used to terminate transmission lines/buses to minimize/eliminate 'reflections' due to impedance mismatch.

The missing resistor may very well be associated with functionality that you're not using. ie: if you don't have 100% of your PCI-E slots filled with all of the PCI-E lanes used, its perfectly conceivable that a missing terminating resistor is of no consequence to an unused lane.

 

[ARIF]

My motherboard model is gigabyte ga78lmts2
It has only one pcie slot in which i have installed gtx 750ti gpu

 

[Harvey]

Are you sure the part is a resistor? Most surface mounted resistors and capacitors of a given physical size look very much alike. If you still have the part, and you can read any numbers on it, a good technician may be able to determine what it is and its value.

If the part you broke is a small capacitor used for power supply "decoupling" (bypassing power line noise to ground), the board could work without it... until you ran into the adverse condition the part was intended to control.

If the part is a resistor, it's more likely that the section of the circuit that was served by the part would fail immediately, although it may not take down the entire board.

Your best bet is to find a qualified tech who can help you identify the part and replace it. The part, itself, probably costs pennies. Whether it's worth replacing depends on whether the tech will charge more than the cost of replacing the motherboard.

I suggest contacting your motherboard manufacturer's tech support. They may be able to identify the part if you send them a photo of the section of the board surrounding the missing part. If you want to have a tech replace it, that info will save the tech's time and your money.

Good luck.

 

[ARIF]

http://www.gigabyte.com/fileupload/product/2/4643/8233_src.jpg

That's the link for motherboard image u will see some small resistor or cap or whatever below the cpu fan pwm header one of them are officially not there but mine has removed from below left one

 

[Harvey]

http://www.gigabyte.com/fileupload/product/2/4643/8233_src.jpg

That's the link for motherboard image u will see some small resistor or cap or whatever below the cpu fan pwm header one of them are officially not there but mine has removed from below left one

Here's the pinout for 4 pin PWM CPU fan connectors:

The component is located between pin 1 (Ground) and pin 2 (+12 Volts) so most likely (not certainly), it's a decoupling capacitor. As I said, above, the board should continue to work without this cap until you encounter the specific interference it is intended to stop.

Without the right tools, replacing a small surface mounted component like that can be difficult by hand. However, if you know how to solder, you can replace it with a small conventional 0.1 uF monolithic ceramic capacitor rated at 16 volts or higher. This one from Digi-Key is 0.1 uF, 50 volts and measures about 0.1" in any direction. The temperature coefficient is not relevant for this application.

1. Clip the leads to around 1/2", leaving enough to grab the leads with a needle nosed pliers while you're soldering.

2. Tin (melt) a small bead of solder onto each contact point on the motherboard. Use an iron with a fine point, and avoid execssive heating by doing this quickly so you don't damage the contact pads and connected traces.

3. Tin the ends of both wires with enough solder that you can heat each capacitor lead to "sweat" it onto each of the tinned contact points. This is not a polararized capacitor so you don't have to worry about which lead goes to which contact.

When it cools, the hardened solder should be strong enough to hold the cap in place. You may have to bend it slightly out of the way of the mating connector from the fan.

Note that, if the part is a resistor, as pitz suggests, installing the capacitor will not damage anything, but you'll still want to replace it with the correct part so do contact the manufacturer's support people to confirm what it is. If it is a resistor, you can use the same method I outlined, above, to mount the proper value.

 

[ARIF]

It's a capacitor i think and i have that knocked capacitor it's way tiny but i will try to solder that
Or I'll contact any local pc expert to do that

 

[ARIF]

That's thing has no number

 

[AE-Ruffy]

Measure it with an Ohm meter (cheap and safe to do) if it has resistance then great.

if not you can use a cheap capacitor tester.
http://www.amazon.com/Honeytek-A6013L-Capacitor-Tester/dp/B0036FQ3FW

 

[ARIF]

Any final thoughts guys

 

[pcgeek11]

Just one. Don't pry on motherboard plugs or components with a screwdriver.

 

[ARIF]

Ok then thanks guys i have contacted a motherboard repairing guy he will do that