repairing Asus TUSL2-C, what type of resistor do I need to purchase? \ VOGONS

repairing Asus TUSL2-C, what type of resistor do I need to purchase?

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First post, by kalm_traveler

Posted on 2021-04-24, 21:15

kalm_traveler Offline

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Hi guys, I finally have time to get back to finishing this project and will be settling on the TUSL2-C. I thought that my first one was defective because the rear USB ports were not working but after fiddling with the power jumper they actually are just fine.

I ended up buying a second TUSL2-C which helped prod me down the troubleshooting path further to figure that USB situation out, and this second one doesn't have the audio bits (first one has the built in audio components) as well as has a working PLED.

With the first one I bought, there is visibly a small SMD resistor that had been ripped off above the front panel connector which seems to be causing the PLED to not work. The resistor next to it is also nearly torn off but comparing this board to the other one both resistors say 221 which I believe means they are 221 mOhms?

I'm looking at Digikey but I'm not sure how to narrow down my search beyond surface mount resistors and 221 mOhms to make sure I'm buying the correct part to fix that first board before I sell it.

Can someone please teach me how to figure this out?

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Retro: Win2k/98SE - P3 1.13ghz, 512mb PC133 SDRAM, Quadro4 980XGL, Aureal Vortex 2
modern:i9 10980XE, 64gb DDR4, 2x Titan RTX | i9 9900KS, 32gb DDR4, RTX 2080 Ti | '19 Razer Blade Pro

Reply 1 of 5, by snufkin

Posted on 2021-04-24, 21:32

snufkin Offline

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221 is 220 ohms. First two digits are the most significant digits, the last digit is how many zeros.

[Oh, and I'd guess they are 0805 package size, about 2mm long?]

Reply 2 of 5, by flupke11

Posted on 2021-04-24, 21:42

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I've taken a picture of my board:

TUSL2C - revision 1.04

Reply 3 of 5, by kalm_traveler

Posted on 2021-04-24, 22:06

kalm_traveler Offline

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snufkin wrote on 2021-04-24, 21:32:

221 is 220 ohms. First two digits are the most significant digits, the last digit is how many zeros.

[Oh, and I'd guess they are 0805 package size, about 2mm long?]

ahh ok thank you, I didn't know how to identify these super tiny SMD resistors 😀

yes about 2mm long, thank you so much. On Digikey, if I pick 220 Ohms and that 0805 package it doesn't have any so I guess I'll have to find a new parts vendor.

Retro: Win2k/98SE - P3 1.13ghz, 512mb PC133 SDRAM, Quadro4 980XGL, Aureal Vortex 2
modern:i9 10980XE, 64gb DDR4, 2x Titan RTX | i9 9900KS, 32gb DDR4, RTX 2080 Ti | '19 Razer Blade Pro

Reply 4 of 5, by snufkin

Posted on 2021-04-24, 22:34

snufkin Offline

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They should have loads. Are you looking under 'Chip Resistor - Surface Mount'?

Just had a quick look, I can see about 300 options on Digikey. Biggest problem will probably be minimum order quantities.

[Ah, found one: https://www.digikey.com/en/products/detail/pa … 6GEYJ221V/89706 ]

[I should also have said, don't worry about not knowing the markings, definitely worth asking about as it's not always clear. E.g., something marked 220 is actually 22 ohms, because it's 22 and then zero zeroes. Here's a page I just found on Google: https://www.hobby-hour.com/electronics/smdcalc.php ]

Reply 5 of 5, by kalm_traveler

Posted on 2021-04-25, 15:36

kalm_traveler Offline

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snufkin wrote on 2021-04-24, 22:34:
They should have loads. Are you looking under 'Chip Resistor - Surface Mount'? […]
Show full quote

They should have loads. Are you looking under 'Chip Resistor - Surface Mount'?

Just had a quick look, I can see about 300 options on Digikey. Biggest problem will probably be minimum order quantities.

[Ah, found one: https://www.digikey.com/en/products/detail/pa … 6GEYJ221V/89706 ]

[I should also have said, don't worry about not knowing the markings, definitely worth asking about as it's not always clear. E.g., something marked 220 is actually 22 ohms, because it's 22 and then zero zeroes. Here's a page I just found on Google: https://www.hobby-hour.com/electronics/smdcalc.php ]

oh crazy and thanks again! I'm not sure what I was doing on the search page but I couldn't find anything. Huge thanks again for the info link!

Retro: Win2k/98SE - P3 1.13ghz, 512mb PC133 SDRAM, Quadro4 980XGL, Aureal Vortex 2
modern:i9 10980XE, 64gb DDR4, 2x Titan RTX | i9 9900KS, 32gb DDR4, RTX 2080 Ti | '19 Razer Blade Pro

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