lg 55ld520-ua inverter burn out.

[splitcrete]

Hi everyone I need to be pushed in the right direction for this one. This is my daughters tv and she said hey dad fix it.If you look at the pictures. I just don't want to buy new inverters, and have it happen again, the connector for the master inverters fried, and it looks like the whole board got damaged the caps almost desoldered themselves. I checked all the power from the PB and it checks out ok tv running and on stand by. What is EER , PDIM , ADIM i dont know how to check them.If I seen that burn when I was working on 480 v panels I would look for a short or a bad ground first. Any push in the right direction would be appreciated . Thanks

[tom66]

Re: lg 55ld520-ua inverter burn out.

That's a common fault on this model/panel. The connector was not seated properly at the factory, causing excessive resistance leading to excessive heat. You can trace the 24V, GND and other wires and bridge them with some cabling capable of at least 5A.

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

The tv is still working Is there any thing I can use to insulate the jumper wires?

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

So I can just find a good spot to ground. The connector is it the inverter connector or the power board connector , or both?

[tom66]

Re: lg 55ld520-ua inverter burn out.

Just bridge the connections individually, or use thicker wire to combine 24V and GND into one or two connections. Nothing else needed.

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

OK thanks will do.

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

The bridging worked , boards are cool and tv is working good.
Thanks for the help.

[mrbacardi]

Re: lg 55ld520-ua inverter burn out.

can you show me a picture of how you 'bridged' these connections to make it work again? your inverters look totally fried around that area.

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

I sold the tv, but I desoldered the connector off each board,and cleaned it up.
Then I soldered 2 wires to connect each board . One for ground and one for power. I put a line of solder for the power also for the ground. I used # 12 strand wire for the fix.

[mrbacardi]

Re: lg 55ld520-ua inverter burn out.

hi splitcrete

thanks for the quick reply. I actually have minimal experience soldering but looked to take this task on my own by individually soldering the 14 wires to bridge the master 1 and master 2 boards. The pins are very close together and i couldn't even manage to solder a single wire (the connector is still attached to the board)

How come you only soldered two wires? Where did you put this line of solder? I tried using a volt meter to check voltage at each pin. Most came back as 0 volts, but two pins read ~50 volts (looked to be pin 2 and pin 10 on the master 1 board).

Looks like your board was actually slightly different. It is a Rev.4, mine is a Rev.6.

[splitcrete]

Re: lg 55ld520-ua inverter burn out.

Unsolder the two connectors. Clean up the mess Solder wick works good for that. Once you have solder cleaned up, follow with alcohol to remove the old flux. I think half were power and half were ground. I put a line of solder across the pads for all four points .
Don't solder your power to your ground.... Then I just soldered a 3-4 '' wire from ground to ground, and power to power. I drew a little picture of what I did .. Don't laugh I am not an artist. Good luck.

[Robo94]

Re: lg 55ld520-ua inverter burn out.

Hello! I believe I may have a similar problem.My connecting sockets are blackened and the jumper cables were burnt badly. I was considering getting new boards but from what I understand you are saying new cables may solve the problem? I know my main board is working on my toshiba 55g310u because I can play music on it and my Tcon board looks fine and it comes off of the main board anyways. Do you think new jumpers would fix my problem?

Also before I purchase new boards or jumpers, is there any way to know if the panel is good? or should the panel be ok?

[dick_barton]

Re: lg 55ld520-ua inverter burn out.

Remove the connectors, clean up thoroughly then bridge the connections as discussed above. This should solve your problem. If it doesn't then that the time to consider replacement boards.