Re: LG 42LH30 with no picture, audio and backlight/screen work

Got the SMT fuse in the mail today and soldered it to the board, replacing the old one. Ended up with the same washed out area as before. Thinking now that it is the panel itself. Kinda iffy about buying a new t-con board if it is the panel.

Vince, I did make sure that the blade fuse was not touching anything else. It was completely free except at the solder points. Selldoor, didn't notice anything in that area of high real estate that had a problem, though I don't know what and how to test.

Re: LG 42LH30 with no picture, audio and backlight/screen work

Tried to power on awhile, no change after about 30 min. Also, the AS15-HF chip did not seem hot to the finger. I took a couple of pics of my solder job, the following are the best I got. Couldn't see any solder bridges. If you think it is still just the board, I'm might just go ahead and replace it. But if the panel is shot, TV tweaking may be finished....

Re: LG 42LH30 with no picture, audio and backlight/screen work

No improvement when I press on the panel. The ribbons from the T-Con board both seem to be right where they should. I must have done something while moving the TV after I did the temp solder job, though I was really careful when I did move it. TV wasn't doing that before. Kind of a bummer that I fixed the problem, but induced a worse one.

Re: LG 42LH30 with no picture, audio and backlight/screen work

I tried putting the TV back together temporarily to see if I got a picture, and I ended up with white bleed through on the right side. I don't know if this is just my solder job, or if I did something else. My solder joint on the right side of the fuse (crowded real estate) wasn't the best and it popped once after testing the TV for the first time (after taking the pic above). After soldering it again, the right side was washed out, this time noticeable with "snow" and when I had the TV inputs on. Don't really...

Re: LG 42LH30 with no picture, audio and backlight/screen work

Great idea tom. Went out and got a 5A blade fuse and soldered it and... snow! Where before all I had was blackness, now I have something! I'll keep it like this until the SMT fuse comes in.

Thanks again for all your help. Not only did I fix my TV, I learned some electronics as well....

Re: LG 42LH30 with no picture, audio and backlight/screen work

Thanks again tom. Ended up in the K ohms range again, about 39.6 K ohms. So looks like the board is okay.

retiredcaps, thanks for that video. Following that, should be able to make an attempt to change out the fuse. Now I'm just trying to find one (probably not something you can find at a radioshack). Would this be an example of what I should get:

[url]http://uk.farnell.com/littelfuse/0461002-er/fuse-smd-nano2-2a/dp/9943374[/url]

Also, tom, you mentioned that 42 inch TVs usually...

Re: LG 42LH30 with no picture, audio and backlight/screen work

Thanks tom for the reply. Tried testing the fuse (pretty small, so hopefully I did it right) and it looks like I am in the K ohms range (my multimeter does not have the ability to chose the range, it is just auto). I did test it on a few larger fuses on the power supply board, they were all close to 0.

Quick question, when measuring resisters, I thought you had to take them off the board. Do you not have to do that with a fuse? Just trying to learn, so thanks again for the help.

Anyway,...

I have a LG 42LH30 LCD TV that suddenly lost the picture. The audio still works and I can switch channels and inputs (though I can't see the menu). Thought it would be an easy fix with just some new capacitors. I opened up the TV, but didn't see any obviously bad capacitors on the power supply board. Testing the board showed that my voltage at the two 5v, the 12v and the 20v were fine. I don't see any obvious problems with the inverter board, but don't know how to test it. There is one suspicious component on the main board (labeled as 3R6), but don't really know if it is just a red herring. If...