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My lg led tv cycles on and off every 5 seconds. I have just…

Customer Question
my lg led tv cycles...
my lg led tv cycles on and off every 5 seconds. I have just replaced my power and main boards because it wouldn't come on, and now it just cycles
Submitted: 3 years ago.Category: TV
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Answered in 4 hours by:
5/31/2015
TV Technician: Russell H., Service Tech replied 3 years ago
Russell H.
Russell H., Service Tech
Category: TV
Satisfied Customers: 12,946
Experience: 8+ years of professional experience
Verified
Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Cases of cyclic restart like that, are definitely a symptom of one of two things:
A. a severe failure of initialization, causing a restart as the only appropriate way of dealing with it, or
B. a shorted component that forces a restart as a protective measure (more or less)
... or perhaps, both. At least that's what it seems like to me.
I suggest that you seek a voltage that is being held down by a shorted board (or, component on one board). This may be difficult to measure with the constant restarts, but is one way toward a diagnosis.
Also, a service manual, with troubleshooting procedures and details as to voltages to measure here or there within the TV, would help you considerably.
A reliable source for a service manual for your model would be
http://www.servicemanuals.net/ServiceManual/LG/55LM6700/703275/detail.aspx
or
http://www.servicemanuals.net/ServiceManual/LG/55LM6700/734823/detail.aspx
depending upon whether you want a download or a paper hard-copy version of the service manual.
Another (crude) troubleshooting technique, if you should not bother with getting a manual, would be to unplug one board from the TV, then plug the TV in and power it On, seeing whether that board's removal relieves the problem... but a service manual's information would be much better for the chances of settling this case with reasonable efficiency.
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Customer reply replied 3 years ago
I was hoping for more than buy the service manual and use it to troubleshoot. Is that all you can do for me?
TV Technician: Russell H., Service Tech replied 3 years ago
Well... I have indicated how you could determine the problem's nature or source. I hope it helps.
Since you have expressed discontent with my approach, I feel it would be best if another Expert helped you further, so I have Opted Out, opening the case to other Experts in this category. Thanks.
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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