Re: Panasonic Viera / 17IPS20 / Backlight or Driver?

Thanks.

So it all seems to be ok from a backlight perspective!

But unfortunately the panel seems to have an issue with a small band of slightly dimmer horizontal lines, I'm pretty sure these were there before I fixed the backlight ... it was an eBay punt!

Anyway, I assume this is a panel issue so not fixable?

Picture attached.

Even if it's a write off, it was a great learning experience doing the backlight.

Cheers,

Lee....

Re: Panasonic Viera / 17IPS20 / Backlight or Driver?

Sorry to be so slow responding to this ... a combination of waiting for parts and being away.

Anyway, like a fool I didn't listen to everyone's advice and I changed the driver ... at first I thought it had worked, but sadly no.

So I dismantled the whole thing and discovered 2 faulty leds ... one was off all the time, the other was off when I was using my constant current source, but often came on (although sometimes with a delay) when using the TV supply.

I've just replaced both of...

Hi,

I've just got hold of a Panasonic Viera 49” screen that seems to have a backlight issue.

The screen turns on fine and runs for a few minutes and then appears to turn off, however it looks like it's just the backlight that goes off, everything else seems ok (sound is still there if I have enough time to get iPlayer started.)

I've done a bit of initial investigation and I suspect the LED driver (MP3349S) on the 17IPS20 power board, as it appears to get really quite hot … pushing 60degrees when measured from the other side of the board, so it's...

Re: New Members - please post your introductions here

Hi,

I'm just starting to have great fun repairing stuff ... have been working on quite a few bits of test gear (mostly bench multimeters), but have just got a TV with a backlight issue to have some fun with (although I need a bigger bench!)

Sadly all the caps look fine!

Lee.