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About Rick Montgomery
Expertise
Most questions about 1970's-1980's audio equipment. Most 1980's -1990's VCR's and VCR combo's. Most 1980's-1990's car audio, except original equipment. I know name brand after-market such as Kenwood, Pioneer, JVC, and some Sony. I am not so good with TV's, DVD's or camcorders. I do not work on Projection TV sets at all. I also have no access to documebntation for sets outside of the United States.

Experience
Professional Electronics Technician since 1975, specializing in most audio, home, portable and car. Also all VCR's. Limited TV knowledge. No projection TV experience

Organizations
Through work, NESDA.

Publications
n/a

Education/Credentials
High School. Graduated with 2 yrs Vocational Electronics in High School.

Awards and Honors
Certificates of completion of factory training seminars for various brands

Past/Present Clients
Thousands of customers to the Service Centers I have worked for.

You are here: Experts > Home/Garden > Home Appliances > TV/VCR/Stereo Troubleshooting > Rolling line on tv screen

TV/VCR/Stereo Troubleshooting - Rolling line on tv screen

Expert: Rick Montgomery - 11/4/2009

Question
QUESTION: Hi Rick; I have a Panasonic model CT-27D11DE which I bought new in December 2001. Lately a line rolls up across the screen. It resembles the line that used to roll across old tvs but they had a vertical hold button which this one does not. Can this condition be fixed, and, if so, how? Thank you; Mike

ANSWER: Mike,
I will need a little more specific information from you before I can begin to advise you. For starters, I need a clarification of your symptom. The "old vertical hold control" was used to adjust in case of the ENTIRE PICTURE rolling up or down by complete frames. This is totally different, and most likely even a different circuit than if your picture is not rolling, but a line is moving up or down the screen, and different yet if a line is moving ACROSS the picture. Either way, it will involve some component-level troubleshooting and testing, so if you have any technical experience, let me know. Also, do you have any tools and test equipment? Soldering equipment and skills?
regards,
Rick

---------- FOLLOW-UP ----------

QUESTION: Rick,
Thank you for your prompt response.
I will attempt to clarify. The picture does not move and the screen can be viewed without discomfort. A line starts about half way up the picture, moves to the top of the screen and repeats. The line is clear in colour so is more prevalent with darker screen colours.
I have no technical experience nor test equipment and haven't soldered for many years.
Regards,
Mike

Answer
Mike,
It's too bad that you don't have the equipment or technical knowledge. This sounds like just a filter problem and quite possibly just one or two electrolytic capacitors. But if you have no way to test or replace parts, then it is something best left to qualified technicians. However, just to make sure we have covered all bases, I have one concern. Usually these lines, or "humbars" will be seen moving over the entire screen. So before you toss in the towel, what are your signal sources? Are you on cable, satellite, or outside antenna through a digital converter box? If you have a way to change the signal source, or try it on DVD and/or VCR? A filter problem will be there in all modes. If for instance you have a satellite receiver, and the lines are there, but not when you watch DVD's, it would suggest that the problem is in the satellite receiver. I hope this helps you some.
regards,
Rick

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