Question about Televison & Video
POWER SUPPLY RUNNING LOW BEYOND 120V LINE-OUTPUT. WHAT CAN THE PROBLEM BE.
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Posted on Jan 02, 2017
ok " check the net for plug and power converters that plug in to
Had a set for Europe worked great
Posted on Jan 22, 2008
SOURCE: no output from power supply
I am assuming that you are very familiar with electronic circuitry and components, use of a DVM and a soldering iron. In the absence of a schematic diagram, and since you have perform initial voltage checks, perhaps you can wing it. Your "brick" will have to follow the basic design of an SMPS (switch mode power supply). Simply stated,an SMPS is an AC to DC to high freq AC then to lo V DC converter. Per your post, you have checked that there is DC (B+) from the AC mains, then what is needed is to check if there is oscillation to produce the high freq AC. Often design calls for an optical coupler, a small rectangular looking component with four pins, two at each end. This is nothing more than a LED and a Light Dependent transistor. Its function is to switch/trigger on the oscillation (and therefore start the SMPS producing the lo B+s).
Again, since there is no readily available schematic diagram, might I suggest that you post back the part numbers of the ICs and transistors. What we can do is pull out their spec/data sheets and/or application diagrams. Such would give us a general idea of the working voltages at what pins and what each component is supposed to do. Example, let us say your power supply uses a 817A/0635 opti coupler and/or an SG5841DZ controller IC, then we can search for them as initially described.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Posted on Sep 30, 2008
Hello! My name is Ivica,and I am from Croatia.I have same LCD which have problem with motherboard.Try to disconect power supply from inverters and then measure all volt line.Maybe failure is on inverters board!Write me if you solve the problem,and maybe you know where can I find new motherboard for my LCD.Thanks.
Posted on Jan 24, 2009
If anyone would like a Power adapter for their Ultra LCD30-500 and LCD40-500 - please email me Acosta.email@example.com... And I’ll be able to order one…
I too own a Ultra Lcd40-500 HDTV. Bought it from HSN.com back in 2006.
My power adapter burned out 2 weeks ago, and to my dismay PWW, or should I say POS has gone bankrupt.
I looked everywhere online and here in San Jose,CA thinking I would find a replacement or at least someone that could repair the blown capacitor( 630v vpmm), thermitors(IRFD460A) and varistor( SCK206).
After calling every power supply company, distributor, and retailer, had no luck finding a match to this crazy looking 9din pin adapter. Disappointed I gave up on a replacement and took it to various repair shops for repair and was told without schematic would be nearly impossible to replicate the power Output. Finally this one shop was able to replace the burned out components and it seem to work at the store. When I got home with it..no luck..red light would come on…but no light on screen. L
Not wanting to give up or trash my LCD. It was time to dig further…I did some research through my employer; a SemiConductor company here in Santa Clara, CA.
Needless to say this power adapter has driven me crazy….It has been exhausting... But finally just yesterday I got the break needed…I found a manufacturer in Taiwan that has these power supplies for both the Ultra lcd 30" and 40". I was told they only sell to Component or Electronic Suppliers. I’ve asked my employer to see if I would be able to order one on their behalf using their account.
Happy ending! My power supply is on it’s way. I was told it could take up to 4weeks for delivery. But I’m just glad to have a replacement.
Posted on Aug 15, 2009
SOURCE: 2Wire Power Supply
My 2Wire just died - I did not know because of the adapter or the router.
I went to Radio Shack to buy what Glen Smith suggested. They do not have them -
I bought Enercell 3/5/6/6.5/7/7.5VDC 2A (Serie 2730333) - plus using old Adaptaplug (I took from other Universal AC Adaptor). AND IT WORK !!!
Posted on Dec 08, 2009
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