Panasonic tc-37lz85 sound, no picture

[wakraus]

Bought in 2008 (xmas) suddenly lost picture, including menus, etc. Sound still works. Found blown fuse on t-con board. Jumpered with 3A auto fuse, now works fine. I have 2 questions:

1. How common is it for a fuse to just "go bad"? Can I expect the problem to recur? Ran it for 6 hours and the new fuse didn't blow (I expected it to blow immediately when I turned on the set.) I used a 3A fuse because it was the closest plug type fuse to 2.3A. I can't read the tiny writing on the old fuse, but I tried to measure it and the only thing I can find which seems to match in size and appearance is a ROHM ICP-S2.3TN.

2. This part is really, really tiny. Is it really necessary to replace the original part or can I just button it up and use it with the jumpered auto fuse? Not too confident about removing tiny SMD device without doing more harm than good.

Rhetorical question: What is the point of this fuse? Panasonic considers the t-con part of the panel and not replaceable or serviceable. Then how does a blown fuse differ from a damaged board? What is this fuse protecting?

[budm]

Re: Panasonic tc-37lz85 sound, no picture

"How common is it for a fuse to just "go bad"?" Quite often. No need to remove the old fuse, you can solder the new fuse on top of the old one or use axial-lead fuse type such as PICO fuse. Picture of the T-CON and the model of the LCD Panel?
Is this the T-CON board you have?
http://www.shopjimmy.com/ips-alpha-t...-con-board.htm

[tom66]

Re: Panasonic tc-37lz85 sound, no picture

I had the TH-32LZ80 with an identical fault. Same model as yours, but 32". Same fuse bad.

[wakraus]

Re: Panasonic tc-37lz85 sound, no picture

Yes, That's the board. Fuse is the first little black SMD just to the right of the LVDS connector.

[tom66]

Re: Panasonic tc-37lz85 sound, no picture

The one I fixed has worked fine for the past year in a friend's room. no problem so far, just needed that fuse replaced.

[budm]

Re: Panasonic tc-37lz85 sound, no picture

According to the picture, the fuse is rated 1.6A, so you can use 2A in its place.

[tom66]

Re: Panasonic tc-37lz85 sound, no picture

I used 1.5A slow blow without issue, 2A should be fine too.

[wakraus]

Re: Panasonic tc-37lz85 sound, no picture

Sorry for not replying. Went to visit our daughter in MN.

Yes, the board is labeled 24V 1.6A. The closest matching part I could find was 2.3A, so I assumed the normal current is 1.6 and the fuse is intended to be slightly larger.

Thanks a lot for the help guys. Without this site it would have taken me much longer to find the problem.