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AC Power Cord Problem

By on November 11, 2008

power line

An ERG member of mine email me about his problem with the RCA television where there was sparking at the AC input area. He could not locate the fault and asked for my advice. As usual i get him to check for any loose connection and bad components at that AC input area but he could not find any bad part. After couple of days later i got his email and this is what he had written:

“The problem with the RCA tv was that¬† the line cord was breaking down under load.Just imagine that and the multimeter was showing good continuity.”

Well in electronic repair line anything can happen, normally only electronic components that breakdown when under load but this time it was the AC POWER CORD! I did not suspect that either but I’m glad that he had solved the problem. So please take note , in future if you come across any suspected section have problem and yet you could not locate the faulty component, try to replace one by one component as there might be a high chances that the components in the suspected location could have breakdown when under full operating voltage.



  1. beh

    September 13, 2009 at 12:55 am


    I had same problem with bridge diodes when i trun on the tv .
    tv does not work and when i check the dioed by ohmeter
    ohmeter was showing that all of them are good
    but under the load they fail to work
    is not easy to solve such problems

  2. admin

    September 13, 2009 at 9:14 pm

    Hi Beh,
    Yes semiconductors have the tendency to breakdown when under load.


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  4. admin

    November 25, 2010 at 9:03 am

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