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Russell H.
Russell H., Service Tech
Category: TV
Satisfied Customers: 10463
Experience:  8+ years of professional experience
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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 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: 1 year ago.
Category: TV
Expert:  Russell H. replied 1 year ago.
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.
Customer: replied 1 year ago.
I was hoping for more than buy the service manual and use it to troubleshoot. Is that all you can do for me?
Expert:  Russell H. replied 1 year 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.