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Bush ws7680 tv pcb

Pcb has blown resistor (R617) can it be replaced and what causes it to blow

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Re: bush ws7680 tv pcb

Yes it can be replaced if you know the value in ohms and watts and you can use a soldering iron.
Resistors normally blow because of excessive current flow sometimes caused by downstream or upstream components that have shorted out or are being overloaded beyond what they are rated at.
Sometimes (but rarely) they just blow for no reason.

Posted on Oct 16, 2007

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The EHT circuits are very susceptible to breakdown if any moisture is present.

You must dry it out as soon as possible - half a day left wet is too much.
Use dry compressed air to thoroughly blown any moisture from the pcb and all other components.
pay particular attention to where moisture might be retained - such as under components mounted on the PCB.
All moisture must be removed, otherwise a combination of corrosion and electrolysis will cause electrical leakage between components and/or eat the pcb tracks and any other exposed copper.
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I can not even begin to help without the model number as each model is slightly different. Can you post that please?


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