Unknown component - Page 1
Forum section: electronics / repair

author: davidclancybell
author_rank: Newbie
timestamp: July 26, 2021, 11:54:03 pm
content: I am attempting to repair a Asus Z97 MB. I had a puff of blue smoke from a component. Does anyone know the component I need to replace, pic attached

author: james_s
author_rank: Super Contributor
timestamp: July 26, 2021, 11:58:33 pm
content: That's a resistor network, going by the number on it I'd say it's a 0 ohm network, ie a set of jumpers. What caused it to burn up? Jumpers don't just fail, something resulted in an excessively high current at which point that device acted as a fuse.

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 12:35:40 am
content: thanks for that. Not sure why it smoked, the pc has been in storage for a while and there seemed to be some corrosion on one of the pins. I am ok at re-soldering so what am I ordering on Ali-express to replace it. Do you think this would prevent the machine posting? Thanks

author: Cerebus
author_rank: Super Contributor
timestamp: July 27, 2021, 03:09:53 am
content: Are you sure the puff of smoke didn't come from the package to its right? That's most likely a transient voltage suppressor (TVS diode array) and that's a device I'd expect to smoke itself if the wrong thing went into the USB port that it's connected to. A zero ohm resistor array is probably going to be a relatively tough customer.

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 04:00:17 am
content: Think I found it but no idea what it is or why it blew

author: fzabkar
author_rank: Super Contributor
timestamp: July 27, 2021, 04:14:45 am
content: That looks like a DC-DC converter, assuming it drives the nearby inductor.

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 04:18:33 am
content: OK thanks for that. Would you have any idea on the package number, going off what's left showing

author: fzabkar
author_rank: Super Contributor
timestamp: July 27, 2021, 04:31:19 am
content: It's best to view the part in the context of its surroundings, but if I were to hazard a guess, I'd say that its manufacturer was ON Semiconductor, or maybe Richtek.Can you show us a more complete picture of the board?BTW, there is a possibility that Vin has punched through to Vout, in which case their may be additional damage downstream. Can you measure the resistance between the inductor and ground?

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 04:46:19 am
content: Sure can. Thanks

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 04:52:51 am
content: chip ringed

author: Rasz
author_rank: Super Contributor
timestamp: July 27, 2021, 06:34:52 am
content: why not check on a boardviewhttps://drive.google.com/file/d/1Lt-KG7f6BGhJb25VW0Ds5fCsUovouYS0/view

author: perieanuo
author_rank: Frequent Contributor
timestamp: July 27, 2021, 07:19:18 am
content: maybehttps://www.richtek.com/assets/product_file/RT8065/DS8065-08.pdfi'll have to dig more, i don't have exactly your mobo schematicsfinally i opened one board view ASUS Z97-A REV 1.03B - Boardview (.FZ), it's (almost for sure) RT8065ZQW

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 09:12:03 pm
content: thanks guys. Trying to open the .fz file with Fritzing but get a parsing error at line 1

author: james_s
author_rank: Super Contributor
timestamp: July 27, 2021, 09:14:51 pm
content: Why are you trying to open it with Fritzing? It says it's for Boardview which is a different program.Fritzing is garbage IMO, I have no idea how it got as popular as it did, the sooner it dies the better.

author: davidclancybell
author_rank: Newbie
timestamp: July 27, 2021, 09:30:06 pm
content: OK got it using BoardViewer