Question about Sony FD Trinitron WEGA KV-36FV310 36" TV

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Sony WEGA 36" will not

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Sony sometimes use a balance power supply, similar design to the Philips design from1978 but updated. A realy efficient and nice design but when it dies it takes out quite a lot.
There is a mains fuse that feeds the bridge rectifier which in turn feeds the power supply. If that is the fuse you are refering to, seek professional help. The circuit is finely ballanced and must be correct otherwise it will go bang again. If this is not the fuse then look for a short circuit on/off switch or filter capacitor network on the A/C side, before it gets to the main power supply.

Hope this helps.

Posted on Dec 31, 2010

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Will not turn on


Check all fuses, if you replace fuse and it blows immediately then the two main culprits are power supply semiconductors and line output stage. even if fuses are not blown those are the two areas I would look at
Check for dry joints around the line output transformer also. That is a common fault.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.

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The Power/High Voltage board is the main cause of this. Most of these boards must be sent to Sony to be refurbished because Sony no longer manufactures the board.
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1 Answer

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There are of course internal fuses, but I suggest you better call a technician if you are not an expert, because you can blow the tv trying to rectify power supply problems. If the fuse is blown, there must be a faulty component behind that.

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1 Answer

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The rear panel nameplate will state the unit power requirements. Look for number of amps draw. Let's say you read "2 A". Now, depending on where in the circuit this fuse is, your fuse size will be no more than two amperes (sometimes slightly greater if slow-blow fuse spec'ed). So, if your fuse is located immediately near the line-cord entrance to circuit board, start with a 1.0A fuse. If that immediately blows, then increase to a 1.5A fuse. Repeat until 2 A fuse is reached. If still blowing, then there is a problem with the set, either power supply or tube.

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