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LG 55" TV model # 55LK520UA chassis # AUSYLJR. Screen comes on several seconds (shows OSD info) then the set shuts down and then the red power LED is blinking. I'm an EET, but not primarily a TV guy.

Posted by William Miller on

  • William Miller
    William Miller May 25, 2017

    It turned out to be the master inverter board # 6632L-0613A (on the left side of the set when looking from the rear with the back off) but it could have just as easily been the slave inverter board # 6632L-0614A on the right side.

    Just to be safe, I bought both used on eBay for about $5 each with free shipping. I swamped the master board, then tried it, and it was fixed. I kept the other board for next time.

    This was advertised as a Vizio brand on the eBay listing, so apparently these boards fit many different brands or more than one at least.

  • William Miller
    William Miller May 25, 2017

    * swapped, not swamped lol

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Sattech

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  • 22 Answers

Ahoy there...Your case would appear to be the classic dying cold cathode tube(s) . After a long service the tubes will grow a carbon track down the tube and it won't take much length to cause an increase in current from high voltage unit . This current is detected and unit shuts down . They can be sourced and replaced , I have seen them from American sources for approx. $30 for 10 40 inch .
HOWEVER I have also watched an LED conversion on youtube which may be a smarter choice as the rest of the tubes will meet that fate sometime . It is a picky , tedious dangerous(to your screen not you so much) process .
If you are mechanically adept and don't use force on the flat wires(there should be ZIF sockets or a stiffened handle , be careful)
you stand as good chance . You need a good sized work space though .
Good luck
Hugh

Posted on Aug 11, 2016

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Ecollier2012

Edward

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SOURCE: Hitachi 50ux58b


If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from www.TvRepairKits.com. They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address. 
Here are the symptoms...

Primary Symptom: No Audio or Video. Power light will come on briefly then shut off.
Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.

Hope this helps,

Posted on Nov 07, 2008

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