LG 60PV450 - Image Retention, Turns Off

[tabascojoe]

Our LG 60PV450 is acting strange and I believe its a bad board. Looking for advice on what board it could be.

A few months ago we noticed an electronic burning smell coming from the set. Unplugged it, waited a day and plugged it back in. The smell was gone but the image was not right. On the top and bottom 3rd of the screen the image had color bleeding (noticeable with white images the most) and would retain images. It was something that didnt bother us so we dealt with the issues. (image attached of the color issue)

Last week the set started to turn off after about 15 minutes of viewing. The frequency of the set turning off increased and now it turns off after 20 seconds. This is where I decided to open it up and check the boards for noticeable issues. From my untrained eye I did not see any obvious signs of damage but took pictures of everything.

Given the symptoms could it the zsus or ysus, or something else?

[tvtimmy]

Re: LG 60PV450 - Image Retention, Turns Off

Take a look under the y & z boards for bad or cracked solder joints on the inductor coils. Very common on this model.

[tabascojoe]

Re: LG 60PV450 - Image Retention, Turns Off

Attached are pics of the bottoms, I did not see bad solder joints, but maybe the pics tell a different story.

[sordids999]

Re: LG 60PV450 - Image Retention, Turns Off

try resoldering the connections i have highlighted with red circles

[tvtimmy]

Re: LG 60PV450 - Image Retention, Turns Off

+ 1

[tabascojoe]

Re: LG 60PV450 - Image Retention, Turns Off

try resoldering the connections i have highlighted with red circles

I was just about to reply on how blind I was to miss that...
Is the carbon looking deposit around the joints pause for concern? Could that indicate bigger issues?

[dskall]

Re: LG 60PV450 - Image Retention, Turns Off

Carbon is from arcing. It's possible you might have to remove coils and clean terminals with sandpaper to get a good solder joint.

[tabascojoe]

Re: LG 60PV450 - Image Retention, Turns Off

My soldering skills are awful. I never learned the proper technique.
I solder the best I could and it fixed the issue. I just don't know how long my joints will hold. If it does break again I'm going to put out an ad to hire someone with soldering skills.

Thanks to BadCaps and the members for helping me out.

[tvtimmy]

Re: LG 60PV450 - Image Retention, Turns Off

Good fix! I had the same problem on 3 of this model.