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dead tv.

emeraan

Jun 14, 2015
5
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Jun 14, 2015
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My sansui 74cm sv2918n just went dead fuse is ok.powercord is ok.no led power indicator light.only funny sound from transformer
 

davenn

Moderator
Sep 5, 2009
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14,254
hi there
welcome to EP :)

have you been able to get any service info for it ?
googling for service manual or at minimum a schematic ?

have you opened it up yet ? if so take a photo of the PSU board for a start
sharp and well lit

Dave
 

emeraan

Jun 14, 2015
5
Joined
Jun 14, 2015
Messages
5
I've open it and check the fuse and incoming power until thu main capacitor the reading at the main capacitor is 320v dc
 

shrtrnd

Jan 15, 2010
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If you've got a dead TV with no bad fuse, something inside burned open-circuit.
Not always, but often when something 'open's, you can see physical damage.
Did you look around the insides and see if you can see any burn-damage to any of the components.
This isn't a sure-fire fix because damage to a component can be invisible to the naked eye,
but it's the first thing I do when I open an electronic device that's 'dead'.
It may help you cut-down on the troubleshooting you'll need to do.
Good luck.
 

emeraan

Jun 14, 2015
5
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Jun 14, 2015
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5
There's no Sign of burned or pop components there's only brown burn marks on the board itself and all the dry point on the board I re solder it all ready
 
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emeraan

Jun 14, 2015
5
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Jun 14, 2015
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So me what part I must replace end what needs some attention
 

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shrtrnd

Jan 15, 2010
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Brown burn marks on the board would indicate a problem area that should be checked.
This would be a whole lot easier if you can Google your TV make and model number, and
see if you can find a free schematic of your TV.
You read 320VDC, so I assume you have a VOM (Volt Ohm Meter) (Also sometimes called a DMM, Digital Multi-Meter)
My initial thought concerning your problem is a big electrolytic cap (or capacitors), or an open-circuit power semiconductor.
It could be anything with the information you've supplied so far. Hope you have the patience to troubleshoot this (which may take a while).
So you'll be disappointed if you expect this to be a quick repair.
We can listen to your symptoms, and offer advice on which component or circuit area to check next, until we isolate the problem.
We'll try to help if you've got the patience to work with us.
 
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