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My sister in law tv Thomson 28wh403s is sparking when the power comes on with no picture. The sparks are coming from the HT any ideas or how much will it cost to repair

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Yes it seems like you have a faulty LOPTX Transformer.. But first make sure where the sparks come from PLease note this is dangerous high voltage, a lott of times the HT wire is burnt trough and can be sealed by thick insulation tape ...thank you

Posted on Dec 07, 2008

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Probably about 300.00

Posted on Dec 07, 2008


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1 Answer

I got power to coil nothing comes out of coil

if you have power to the coil the only things that can be wrong are: -
1. the coil is duff.
2. The HT lead is broken.
3. the plug cap is duff, broken.

Remove plug cap and see if there is a spark from the wire core when the lead is placed near the engine/frame.

If it sparks OK replace the plug cap,. no spark means either the coil or the lead are duff. If you can replace the lead try testing again without the cap. Hope this helps.

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check your spark plug to see if you have a spark if not check your spark plug cap to see if that id the reason and if its not that check your ht lead dowt it will be that but its possible then check your coil to see if theres any power coming from that .
2nd... you might be starving it from petrol remove your carb and clean it all out remove your jets and blow them to get a dirt out that is in them , then remove your petrol pipes and clean them out to prevent any blockege

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1 Answer

I get interferance mainly red and green lines appearing on top of the picture plus crackling noises

Please put off your tv and open the back side of the TV. Look for dirt on the back side of the CRT that is causing the arcing of the high voltage. So when the high voltage is sparking against the ground section the lines are coming to the screen. So use a good dry cloth to clean and wipe clean.Use a good solvent like methy spirit to clean. Check to trial and repeat if the fault is repeating. Make sure the HT lines are not touching but keep them apart to redduce the sparks. Hope this will get the TV right. Good day

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