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
Take a peek into the world of a test engineer – and then tell us about yourself! We want to know what part each of our readers plays in the wonderful umbrella known as design engineering.
On Sunday, when more than a hundred million Americans turn on their televisions to watch the Super Bowl, they might consider first giving thanks to a polymer known as polybutadiene. .
Design News is pleased to present the finalists in the Design Tools - Hardware & Software category of our 2016 Golden Mousetrap Awards.
The series now can interface with a wider array of EtherNet/IP-compliant hardware across many industrial sectors, including factory automation systems, plastic injection molding apparatus, and materials-handling equipment.
Gadget freaks at the Pacific Design & Manufacturing Show in Anaheim next week are in for a special treat: a chance to participate in a slot car competition on the show floor.
More:Blogs|News
Design News Webinar Series
1/28/2016 11:00 a.m. California / 2:00 p.m. New York
12/8/2015 11:00 a.m. California / 2:00 p.m. New York
2/18/2016 11:00 AM PT | 2:00 PM ET
2/24/2016 11:00 AM PT | 2:00 PM ET
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jan 11 - 15, Designing ARM Devices Using Segger Tools
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.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

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