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LG 42LS5700 42 Inch 1080p 120Hz Smart TV LED LCD HDTV - Page 9 Questions & Answers
Bottom of TV lights up but dims and get brighter and dims
If you buying from ebay it's very possible for this model TV to have two power boards that are defective as it has a history of LED issues that damage the power board, a lot of sellers on ebay get broken screen TVs and remove the boards and sell them without testing or having any idea how a TV works, send both back you bought on ebay at the sellers expense if they were guaranteed working. Shopjimmy.com has a kit with both the supply and new LED's that will be tested and work, this set uses a couple different LED strips that aren't interchangeable, make sure you match correctly
How do I get my lg smart tv from repeating start up logo cycle after factory reboot ?
HI Mark...I think I know what's going on with your TV but to rule out a power board issue test the 13 volt rail, it runs all the time so it can be tested with the set off, this model set uses the eay64009501 power board, it's incredibly simple and gives very few issues so I don't think it's the power supply making the set not work. I believe you have corrupt data in the EEPROM causing the somewhat erratic issues your having, if that's the case replacing the main board will correct the issues, make sure to get the exact model main as it uses a couple different ones that aren't interchangeable...Good luck!
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