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Power requirement to identify the right transformer among many

I disconnected my power supply and it got mixed up with zillions of others. What is the voltage requirement for the freeagent Extreme so that i can identify the right supply?

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Output voltage is 12 volts at 2 amps. 24 watts.
See if it looks like this,

http://cgi.ebay.com/12V-AC-Power-Adapter-For-Seagate-FreeAgent-Pro-drives_W0QQitemZ260396021307QQcmdZViewItemQQimsxZ20090419?IMSfp=TL090419153008r30934

Posted on May 10, 2009

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Why wont tv turn on today worked fine yesterday? powers up but shuts right back off.


This is a general answer to your question:
Your TV is shutting down because it is consuming too much current from the internal power supply. The power supply has a protection cct
to protect your TV from further damage. If yo have any technical background, then you can follow these simple steps to troubleshoot your TV fault with the aid of a schematic diagram. Let us revise what you need for your job:
1- You need a schematic diagram for your TV model
2- You must be very careful when dealing with powered equippments
3- You need to prepare all the required tools to start your test and repair
4- You must be very confident that you are able to do the job using scientific steps. We all have done many mistakes but at the end we became experts in our fields. Please remember the fault is hidden somewhere and you are going to dig it out.

Let me start now:
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Now if you have identified the power supply board(SMPS) which is very easy to find, disconnect the output jack and test each of the male and female jack pins with the ground. Use an AVO meter (put the selector to ohms) to check for any short cct with the ground. Remembr that there are some pins connect to the ground in both jacks. If you find any thing abnormal then compare your findings with the diagram. Alternatively, you can power your TV and measure the voltages at the output pins of the power supply and compare your readings with the service manual, but please be very careful. Again remember that switch mode power supplies (SMPS)
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If the power supply was perfect then we are sure now that the problem is somewhere else, but in certain and limited cases some SMPS cannot provide the required power to the load due to internal changes and shifts in the values of the components in the loads and the power supply. In this case you need more experience to identify the source of the problem.

We have now finished from the power supply, however in the old TVs there is another power supply source which is the line transformer. This one is very simple and I am going to discuss that later.














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