What are the surface mount devices right next to the memory slots? I broke one and I have pictures. (8KHA+)

[Dead3ye]

I broke one during a heatsink removal. I was wondering what it is and if it can be replaced. I have no idea what it is. It's labeled RN48 and has 220 on it. The board still turns on but gives a memory code error and won't post.

Picture of the whole board to show location.

Up close and personal picture of the broken part.

Any thoughts?

 

[yodayoda]

meh, that's why they invented RMA

 

[tranceport]

its a semiconductor from what I can tell. You may notice something simple like. dimm3 may have trouble or not work at all. or Secondary IDE controller won't work.

Most likely the board will still function enough to be of some use in the event you cannot RMA.

I for one, Would RMA immediatly and hope they send you another.

 

[orion7144]

RMA ASAP if still under warranty. If not and it is affecting your board you can always order one and solder it yourself. That chip shouldn't cost more than a buck or two.

 

[Elcs]

I RMA'ed my EPoX 8KHA+ Northbridge Fan (yes pointless but I see the errors of my ways now) and they were fast. Had it gone 1 day, had it back within 3 days. Fast enough for me to give them a thumbs up. Hope you have success with an RMA.

 

[zephyrprime]

I think it's a 220ohm resistor network.

 

[eclectro]

I have worked with smt parts in a manufacturing enviroment. What you damaged is a resistor network. It looks like this one is 22 ohms and is used as a pull-up for one of the data/address lines.

Because the board fails memory test and won't post, it's safe to say you cracked the part all the way through and that part will need replacing.

I wouldn't encourage you to replace the network yourself, because you don't know what kind of resistor network it is (there are a couple - isolated vs. bussed) and you can make a real mess of things unless you are very comfortable (i.e. experienced) with surface mount work.

If you send it back, put a piece of masking tape with an arrow pointing to the part. Depending on who made the board, some manufacturers have flat rate exchange fee for this sort of thing (if you are lucky).

This brings up another issue. People need to be very careful handling boards - both motherboards and the ones they plug in, because if you put too much force on a board and bend it you can crack these parts very easily and never know it. This either will kill the board or introduce glitches that you will be tearing your hair out trying to find the source to.

 

[Dead3ye]

There is no option for RMA. I bought the board here and I have no receipt or any other information. Plus I did the Vcore mode on it, although that could be removed easily enough. Plus, I broke it, it's not the manufacturer's fault.

I have friends who work in an medical ultrasound plant where I used to work that could probably replace this part if I know what it is. I'll check on the resistor network part and see if it matches up.

Thanks for the info.

 

[rogue1979]

Originally posted by: Dead3ye
There is no option for RMA. I bought the board here and I have no receipt or any other information. Plus I did the Vcore mode on it, although that could be removed easily enough. Plus, I broke it, it's not the manufacturer's fault.

You're a good honest person, nice to see this. If you can identify the part, soldering a replacement should work. Or you can keep checking newegg's, refurbished motherboards, and get one for $29-$39 shipped

 

[Killrose]

It's a surface mount chip resistor array, with 4 resistors, with a value of 22 Ohms.

 

[Dead3ye]

You're a good honest person, nice to see this. If you can identify the part, soldering a replacement should work. Or you can keep checking newegg's, refurbished motherboards, and get one for $29-$39 shipped

Thanks for the kind words rogue1979. I already checked Newegg, they don't have any refurbed Epox boards at the moment. Plus I have a used 8K3A+ coming so I'm in no hurry at the moment.

It's a surface mount chip resistor array, with 4 resistors, with a value of 22 Ohms.

Thanks Killrose. Now I have to figure out if it is isolated or bussed. I have an email to Epox about it, but I doubt I'll get a response anytime soon.

 

[Killrose]

Chip ID# 221 would be a network resitor with a value of 22 Ohm. I beleive this is also termed as a bussed resistor.

Chip ID# 220 would be a isolated array type resistor.

Though the numbers denote type, they don't determine size used which you would have to measure, and that would be a decimal in. measurement.

 

[Peter]

RN are Resistor Network. 220 means it's 22 x 10^0 ohms, aka 22 ohms.

Easily replaced if you CAN solder, and normally an obvious case of no free RMA because YOU broke it.

 

[Killrose]

If it is an array resistor, you could possibly tack a 22 Ohm resistor at the end which is chipped off (the opposing solder joints), the damage may only be to the resitor at the very end.

Oh, oh, now wer're speculating with electronics :Q

 

[eclectro]

yeah, that's right, 22 ohms. Once these things are cracked, forget trying to fix it by soldering the part though.

 

[Killrose]

Yeah, I should'nt start any ideas about trying to hack it any more than it already is. Best to try and get the correct part and carefully replace it. But I would like to know if it is an isolated array type or if is in fact a network type. I see the board say's "RN" on it, but all the info I have look at in parts manuals shows a 220 as an isolated array type. But then again I don't claim to know or have all the answers.

 

[Dead3ye]

This is what I found out so far:

I got onto CTS Corp's website (along with others) and looked at their data sheets for their resistor arrays.
The 220 denotes that it is a 22 ohm array. 221 would be 220 ohms, 222 would be 2.2 Kohms, etc. What is interesting that thier all thier bussed arrays only go as low as 33 ohms, where thier isolated arrays go down to 10 ohms. Plus the smallest number of pads on their bussed arrays is 10. The one I broke has 8.

From what I'm looking at (specsheet) I'm willing to bet that I'm looking at a 742X083220J convex chip isolated resistor array. Now if i can find one as I don't think I can order directly form CTS, I'll update this thread as to how I make out. The friend I was talking about checked and the smallest they have is 100 ohm. They do have the facilities to replace it for me.

Thanks for the info and help. :beer:

 

[eclectro]

Try digikey.com for a similar part (I think they have a minimum order though). It's always hard to buy onesy twosey in the electronics world.

Another thought of finding out what type of network it is is to remove it and then put an ohm meter on the pins to determine how it's arrayed.

 

[Killrose]

Originally posted by: eclectro
Try digikey.com for a similar part (I think they have a minimum order though). It's always hard to buy onesy twosey in the electronics world.

Another thought of finding out what type of network it is is to remove it and then put an ohm meter on the pins to determine how it's arrayed.

Digikey has it, and Mouser probably does too. I have accts. with both of them but hardly ever order from them. But they will ship USPS and I don't think Mouser has a minimum. If I had an order going to either of them, i'd get you the part (I think it's 10 peices to a tape roll) but depending on which size you have it could cost you .60- $2.50 for the part.

 

[Dead3ye]

Well, I got the part from Digikey (actually 10 of them), had my buddy replace it for me and it works! The part I got was made by Panasonic and it was indeed a 22 ohm convexed isolated resistor array.

Just thought I'd update this thread as to how I made out. :beer:

 

[orion7144]

Originally posted by: Dead3ye
Well, I got the part from Digikey (actually 10 of them), had my buddy replace it for me and it works! The part I got was made by Panasonic and it was indeed a 22 ohm convexed isolated resistor array.

Just thought I'd update this thread as to how I made out. :beer:

Thats great to hear. And proves again how valuable these forums are.

 

[Dead3ye]

These boards are extremely valuable. The part itself was only $.96 for ten of them, $6.00 s/h. Not too bad. I put it in my second machine which had a Soltek 75DRV2 KT266A in it. The Soltek in itself was not a bad board, just not a feature rich as the Epox board. Oh well, now I have a MD to sell. Off to the F/S forum...