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What are these components on the board?

post #1 of 5
Thread Starter 
I have a motherboard and I know a bit about motherboards because I have installed 3 of them for the neighborhood kids who paid me to build them a gaming computer. They were all satisfied by the way. Anyways, I was wondering what these components were for.



See, there is a green LED right above something called CLRTC. What is the light for and what is the CLRTC for? Also there is a header for something called COM1. I am a semi noob at building this stuff so please don't tell me "You build PCs and you don't know what those are for?"
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Zen
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post #2 of 5
Thread Starter 
Oh I forgot to add it's for an ASUS M5A97 LE R2.0
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post #3 of 5

CLRTC means to "clear real-time clock" and it usually means there's a CLRTC jumper on the motherboard which in many cases can be used to clear the CMOS too. COM1 is an old serial port.


Edited by Sainesk - 1/25/13 at 10:10am
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post #4 of 5
Maybe it lights up when you have the jumpers moved to clear the CMOS...? I really wouldn't worry about it unless one day you had an issue and it was the very last troubleshooting you needed to do.
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post #5 of 5
The light is just an indicator so you know the device is powered, generally if the light is on you don't want to add or remove hardware.

the blue jumper closest to the writing is being referenced by the CLRTC.. if you swap the jumper over it will clear any bad bios settins, disconnect the power and ensure that light is off before you try to clear the settings, once cleared you'd put the lumper back to it's standard position and then reconnect the power and reconfigure your bios again.

Com1 is a header for a 9 pin D sub connector.. aka serial port. not used very much these days as most things are USB but there are still the odd accessories that make use of them.
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