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Showing posts with label power. Show all posts
Showing posts with label power. Show all posts

Tuesday, November 8, 2011

Wiring Phono Jacks/Plugs and Power Supplies?

Basically MONO Jack/Plug it is always wired the same. There are only 2 wires, one + Plus, Positive. and one, - Negative, ETH, GND. The Minus, GND, ETH, - Negative, always, logically, goes to the or Negative or "Case" ETH, Gnd, those terms all mean the same. Now the + Positive is always Plus,. If the connection is for a Coaxial Cable then, the inner core is Plus +, and the Shield is always - Negative, Gnd, Earth. All Jacks and Plugs wire the same. With a Phono MONO Phono Jack, the "Bulb End" is always Positive, the Case or Outer is - Negative. NOW, IF the Jack/Plug is a STEREO one, then with that type of Plug/Jack there is simply, Two + Plus Wires, and, Two, - Negative, Eth, Wires, these Two, Negatives, Earths all Contact together, and go to the Negative or Outer Connection. The Two + Plus Wires, go, One to each of the tip connection, of the Two Positive Connections, that go to the end, Bulb Tip A & Tip B, of the Stereo Jack./Plug. 
For Power Connections the same is generally true, the Centre Conductor is usually Positive, while the other one is - Negative, case, earth ground.
This details will give you basic details of wiring jack/plugs.


Thanks.

How to reset?

Reset can be performed on many device and units.
Ok, many things will work again only after they are "Reset" now to reset your device, if it has a battery, it MUST be removed totally, if on Power, it must be removed, if on BOTH, both must be removed, wait 5 mins or so, then look around the edge back, side, of your unit for a small hole & or button, while the battery is out,power off, depress this button for say 10 seconds, then reattach battery and power up. The unit, with any luck, it should be working again. If it doesn't work first time, simply try again, BUT this time wait like 20 mins, before you try to press the "Reset" button. Hopefully NOW you will be all good. If not then you have some "Other" sort of problem and that needs more inspection.



Sunday, November 6, 2011

TV repairing?

Repairing tv needs various components and diagrams.
Ok so you want to service your own TV, well i will briefly describe what you may need. First and foremost you need a Service Manual, why you may say? well if not for the troubleshooting algorithms, and component placement. The MOST IMPORTANT thing is that these manuals give us the PART NUMBER that identifies EVERY component and part in the TV. Without this number you simply cannot order parts, as there is no way to describe what you need, without it. 
You need a Good Multi Meter. 
You need an Isolating transformer if you do not want to kill yourself. 
You may like to make a pair of switchable out, 100 Watt light bulbs wired in series in the mains circuit, to "Buffer" the Voltage and so you can work on hic-upping switchmode power supplies. 
Ideally an Oscilloscope. at least 100MHz. Dual Input. & 1:1 & 1:10 Probes; 
Tools, include, Torx drivers, Philips screwdriver, Slot, Small Side Cutters. Long nose Pliers, Tweezers, Soldering Iron, 40 Watt fine Conical Tip. Solder, De-soldering Pump.. Various "Solder Picks". Small Dentists Mirror and Magnifying glass. 
Also a Dual Output Power Supply, proves invaluable. 
With the help of the above mentioned tool and service manual, you can repair your tv.
But basically you need to have voltage testing and soldering iron using knowledge.With you this knowledge it will be difficult for you to start troubleshooting.



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