Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
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!!?? I would appreciate a rational explanation - = - Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist http://www.panix.com/~vjp2/vasos.htm ---{Nothing herein constitutes advice. Everything fully disclaimed.}--- [Homeland Security means private firearms not lazy obstructive guards] [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos] |
#2
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
On Sun, 4 Aug 2013 01:13:08 +0000 (UTC),
wrote: 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!!?? I would appreciate a rational explanation 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 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#3
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
wrote:
In Dec 2008 I lost two LED monitors in one week. There was light rain in both cases but nothing got wet. If you bought them at the same time and they saw similar use it could be they reached the end of their service life. |
#4
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
Jeroni Paul har bragt dette til verden:
wrote: In Dec 2008 I lost two LED monitors in one week. There was light rain in both cases but nothing got wet. If you bought them at the same time and they saw similar use it could be they reached the end of their service life. You mean the warranty timer? Set to go off 13 months from purchase :-) Leif -- Husk kørelys bagpå, hvis din bilfabrikant har taget den idiotiske beslutning at undlade det. |
#5
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
"What's an LED monitor? Is that an LCD monitor with LED backlighting
or did you mean an LCD monitor?" Yes, that is what the civilians call them. In fact that's what it says on the box usually. "You mean the warranty timer? Set to go off 13 months from purchase :-) " That could be alot closer to the truth than most people realize. When you buy the components in very large quantities and they are all exactly the same it makes it almost possible to get it down to a couple of months, semi-reliably. In fact that brings up a topic I am going to start in SED about just that. I'm glad this took that direction which remonded me of it. Collegues in the repair field don't see it but I have pretty good evidence that there 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 the 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 volts 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 that had problems with part(s) of the backlight array shorting out, which made the inverters look bad. The design was such that you could not disconnect 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....LOL |
#6
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
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. - = - Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist http://www.panix.com/~vjp2/vasos.htm ---{Nothing herein constitutes advice. Everything fully disclaimed.}--- [Homeland Security means private firearms not lazy obstructive guards] [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos] |
#8
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
"I would be interested in your findings of evidence that there is a
planned failure of software due to ESR " https://dl.dropboxusercontent.com/u/...6/mitsdpps.jpg Consider what happens when the ESR of C9015 drops. It looks like it is designed purposely to cause the voltage supply to come out of regulation somewhat at random. You know what happens to certain types of digital circuits when 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 voltage at C9016 constant because that is where it's sensed. If you repaired Panasonic VCRs in the past you know what can happen, all the other voltages rise, and I fully understand that this is undesirable. If the real goal was to keep the PS from running too high there are many simpler and more effective ways. This is obviously not for stability, that's what C9084 and R9014 are for. Note that C9087 is a fairly high value. Playing with the cicuit mentally, like putting a resistor in series with C9015, it looks a bit like an oscillator. 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 software "updates" from the manufacturer. The symptoms would vary quite widely for 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 correction, 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 moving and buy another one. |
#9
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
What's an LED monitor? Is that an LCD monitor with LED backlighting or did you mean an LCD monitor? -- Jeff Liebermann Yes, what indeed ? When the first 'LED TV' came out a few years back, I had a heated thread going on on here about it, in which I claimed that they were misleading the public because the display technology was not LED as was being implied, but instead was plain old LCD, being backlit by LEDs. I can't remember who the manufacturer was - Sharp maybe ? - but anyway, after a few months of selling and advertising it in this way, the wording was subtly changed to reflect the fact that it was just an LCD panel. Perhaps one of their engineers reads S.E.R. :-) Arfa |
#10
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
"Arfa Daily" wrote in message
... What's an LED monitor? Is that an LCD monitor with LED backlighting or did you mean an LCD monitor? -- Jeff Liebermann Yes, what indeed ? When the first 'LED TV' came out a few years back, I had a heated thread going on on here about it, in which I claimed that they were misleading the public because the display technology was not LED as was being implied, but instead was plain old LCD, being backlit by LEDs. I can't remember who the manufacturer was - Sharp maybe ? - but anyway, after a few months of selling and advertising it in this way, the wording was subtly changed to reflect the fact that it was just an LCD panel. Perhaps one of their engineers reads S.E.R. :-) Arfa Ah, but edge-lit LED displays are some crazy-ass technology! The way light propagates through those things is amazing! Mark Z. |
#11
Posted to sci.electronics.repair
|
|||
|
|||
2008 lost LED mons while rained
://www.web-design-hyderabad.in/seo-course-in-neredmet/
Contact for advisor : +91 9177522892 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 problem might be because of design quality, not providing dynamic works like contact 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 the client, you have to be explain the work of cost exactly, If not a designer 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 used 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. As 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 have an lot of option to use HTML B tables and style sheets and many more. They also have animated images, and Flash also introduced. It changed the whole landscape of web design from static to dynamic. The first web site published in the World Wide Web history at sometime in August of 1981. It was some 30 years ago, however the Internet born in the sixties. It wasn’t fast as today. However it was capable in transferring information from one computer to another. Tim Berners was the first person who 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) patron and server via Internet. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
2008 new year,2008 new business, 2008 new life, much cheap and beautiful product will help you which r u like ? | Home Repair | |||
2008 new year,2008 new business, 2008 new life, much cheap andbeautiful product will help you | Home Repair | |||
2008 new year,2008 new business, 2008 new life, much cheap and beautiful product will help you which r u like ? | Woodworking | |||
2008 new year,2008 new business, 2008 new life, much cheap andbeautiful product will help you which r u like ? | UK diy | |||
2008 new year,2008 new business, 2008 new life, much cheap andbeautiful product will help you which r u like ? | Electronics Repair |