HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 5/5
naperlou
User Rank
Blogger
Re: cutting one corner too many.
naperlou   5/22/2012 9:06:22 AM
NO RATINGS
This sounds like a common problem with electronics and I think it must be the components. 

I was at the CompUSA warehouse (my son and I go there often).  We are lucky to have this nearby.  The store front is like a factory outlet.  We were looking at building a server, so I was looking at motherboards.  All of them seemed to have a claim that they used Japanese capicators of a certain type.  I wondered at this, since most were made in Taiwan.  After asking around I found that there had been a rash of failures of motherboards a while back, and the cause was cheap capicators.  Sounds like Acer did not get the memo. 

Isn't it interesting that something so basic as a capicator (and its placement) can cause so many problems?

nauzad
User Rank
Silver
Re: cutting one corner too many.
nauzad   5/22/2012 9:01:31 AM
NO RATINGS
I dont remember the brand of capacitors on the board, but I replaced them with Nichikon.

rjnerd
User Rank
Gold
cutting one corner too many.
rjnerd   5/22/2012 7:14:45 AM
NO RATINGS
By any chance were the capacitors branded "LTEC".  If you have a TiVO HR10-250 (the HD DVR that DirecTV distributed)  eventually the thing will start reporting an intermittent overheat condition.  No, its not actually over temp, intstead one or both of the power supply capacitors that are filtering the 5v supply will have the self-same domed top.

Its happened to me on two of them, and if you peruse the Ebay listings of ones offered for parts, you will be sure to find one or two on offer that are also suffering the same problem.  A little time with a soldering iron, and some replacements with a higher temperature rating, and they are fine.

I did notice that the replacement units I bought were noticeably larger than the originals, it was a bit of a squeeze getting them in.  They are located inside an inverted U formed by two of the heat sinks.  They even have one of them in contact with the to-220 case of a switch transistor, and covered with a big blob of glue, that I am sure helps keep them from cooling (hence my grabbing the highest temp spec I could find).

Because the designer packed them in right next to the hottest components on the board, how much was the fault of the capacitor and how much was just due to years of a bake cycle (they don't have an off switch).

<<  <  Page 5/5


Partner Zone
Latest Analysis
Former DARPA official and Google executive Dr. Kaigham Gabriel believes sensor companies think too much like suppliers and need to bring their products closer to the consumer.
One way to keep a Formula One racing team moving at breakneck speed in the pit and at the test facility is to bring CAD drawings of the racing vehicleís parts down to the test facility and even out to the track.
Most of us would just as soon step on a cockroach rather than study it, but thatís just what researchers at UC Berkeley did in the pursuit of building small, nimble robots suitable for disaster-recovery and search-and-rescue missions.
Engineers at Festo were inspired by how a caterpillar builds its cocoon when designing its new 3D Cocooner printer.
Design engineers need to prepare for a future in which their electronic products will use not just one or two, but possibly many user interfaces that involve touch, vision, gestures, and even eye movements.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Course June 28-30:
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service