In Dec 2008 I lost two LED monitors in one week. There was light rain in both cases but nothing got wet. I mentioned this to other people said this happened elsewhere. Two insisted it happened to them, and others were hearsay. The same week!!??
The rain shorted out the insulators on the power lines. The circuit breaker tried to find an alternate route for your power and produced a glitch or spike. A surge protector might have helped, but if the energy in the spike was more than the MOV could bypass, your power supply probably took the hit.
What's an LED monitor? Is that an LCD monitor with LED backlighting or did you mean an LCD monitor?
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Yes, that is what the civilians call them. In fact that's what it says on t he box usually.
That could be alot closer to the truth than most people realize. When you b uy the components in very large quantities and they are all exactly the sam e it makes it almost possible to get it down to a couple of months, semi-re liably. In fact that brings up a topic I am going to start in SED about jus t that. I'm glad this took that direction which remonded me of it. Collegue s in the repair field don't see it but I have pretty good evidence that the re is a planned failure of software due to ESR in a certain filter.......
However I do not believe that is the case here. I believe it was luck of th e draw actually, even if the actual fault turns out to be the same in each unit. the OP did not specify if they were the exact same model.
Even if the humidity got to ridiculous levels I am still going with luck of the draw because in an LED backlit set there is only a couple hundred volt s across each string. In a CCFL backlit set, of a certain model I could go with environmental factors. IIRC there were some Emerson (et alii) models t hat had problems with part(s) of the backlight array shorting out, which ma de the inverters look bad. The design was such that you could not disconnec t each lamp separately so it wasn't hard to get a bit tripped up. Gawd i am sick of brownwares but after my recent experience with that Tektronix....L OL
One was on a Compaq Aero 4/24 I got used. THe aero was the best laptop I ever used. Ev'tho only DOS, but it was perfect for most things.
THe other a year old siemens monitor. I'm thinking geomagnetic storm because they both used transformed DC power. Remember it was only drizzling and it was four days apart.
Now the two 2002 modem incidents made more semce. There was lightning. In fact in the second case we had a microburst tornado that took off a few roofs and a fence on my block. I put a surge protector on th eentire phone line after that.
If one says once burned, twice shy, what do you say for twice burned? I avoid using any plugged-in computer of my own when it rains as a result.
Consider what happens when the ESR of C9015 drops. It looks like it is desi gned purposely to cause the voltage supply to come out of regulation somewh at at random. You know what happens to certain types of digital circuits wh en that happens.
I could understand some form of failsafe because as the ESR or C9015 rises the SMPS will tend to put out more voltage to compensate and keep the volta ge at C9016 constant because that is where it's sensed. If you repaired Pan asonic VCRs in the past you know what can happen, all the other voltages ri se, and I fully understand that this is undesirable.
If the real goal was to keep the PS from running too high there are many si mpler and more effective ways.
This is obviously not for stability, that's what C9084 and R9014 are for. N ote that C9087 is a fairly high value. Playing with the cicuit mentally, li ke putting a resistor in series with C9015, it looks a bit like an oscillat or. Without any DC coupling via the path made by C9087 it would do nothing to actually lower the output of the SMPS, simply make it fluctuate.
The unit that circuit is in is plagued by software problems requiring softw are "updates" from the manufacturer. The symptoms would vary quite widely f or the obvious reason. When I did the software "updates" I changed C9015.
What else would corrupt the data, so CONSISTENTLY, in one certain series of units ? It may have been better software, possibly with better error corre ction, but that does not explain C9087 and R9088.
Knowing capacitors, what happens ? There is a power outage or the unit gets moved and then it does not work. People might think they broke it in movin g and buy another one.
Web Design Hyderabad has a great demand and much more competition, But many of companies are not able to provide good service for customers, The probl em might be because of design quality, not providing dynamic works like con tact form or may be client expecting more work with very low cost.
To work with Web Design in Hyderabad, A designer should more honest with t he client, you have to be explain the work of cost exactly, If not a design er will be struggled one day with client, Every one knows a designer can do any work but it takes time right, We have to cost as per our time
web design companies in hyderabad
Web design history
The Hypertext concept was invented by Ted Nelson in 60s, however it was use d only for some decades after. During 1992 to 1994 other developers started adding up their own bits of HTML codes. HTML 1 tags and the HTML 2 born. A s internet faster now the Web designers are putting more HTML capabilities. In 1995 more HTML tags have appeared and HTMl 3 was born. Now designers ha ve an lot of option to use HTML B tables and style sheets and many more. Th ey also have animated images, and Flash also introduced. It changed the who le landscape of web design from static to dynamic.
The first web site published in the World Wide Web history at sometime in A ugust of 1981. It was some 30 years ago, however the Internet born in the s ixties. It wasn?t fast as today. However it was capable in transferring i nformation from one computer to another. Tim Berners was the first person w ho invented the World Wide Web. Tim Berners is British computer scientist. The First website launched in year 1990. on December 25 1990 with the help of Robert Cailliau and young student at CERN, Tim Berners implemented first successful communication between a Hypertext Transfer Protocol (HTTP) patr on and server via Internet.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.