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
Iron
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
Self-driving vehicle technology could grow rapidly over the next two decades, with nearly 95 million “autonomous-capable” cars being sold annually around the world by 2035, a new study predicts.
MIT’s Senseable City Lab recently announced the program’s next big project: “Local Warming.” The concept involves saving on energy by heating the occupants within a room, not the room itself.
The fun factor continues to draw developers to Linux. This open-source system continues to succeed in the market and in the hearts and minds of developers. Design News will delve into this territory with next week's Continuing Education Class titled, “Introduction to Linux Device Drivers.”
Dean Kamen tells an audience at MD&M East 2014 how his team created the DEKA Arm to meet DARPA's challenge to design a better prosthetic arm for wounded veterans.
The new draw-it-on-a-napkin is the CAD program. As CAD programs become more ubiquitous and easier to use, they have replaced 2D sketching for early concepting.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 4 - 8, Introduction to Linux Device Drivers
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


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 Class: August 12 - 14
Sponsored by igus
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service