Panasonic TX-L42B6B No Picture

[Norman1]

Hi guys, got a Panasonic that comes on with a dark picture which you can see for a few seconds with a torch shining on the screen while it flashes slightly, then it go's off with the red standby light flashing. Anyone had the same?

[unxtres]

Re: Panasonic TX-L42B6B No Picture

Bad capacitors, dry solder joints, broken led controller, burned led in backlight stripes.
I`ve listed few possible issues that can cause problems you`ve got .

[Norman1]

Re: Panasonic TX-L42B6B No Picture

Anyway of narrowing it down a bit the red s/by light flashes once every 4seconds

[unxtres]

Re: Panasonic TX-L42B6B No Picture

Wow. you think this is simple repair and you do this with screwdriver? The answer is no.
This is PSU or backlight leds are gone, if you don`t know what are you doing than take tv to nearest tv service

[dskall]

Re: Panasonic TX-L42B6B No Picture

Is image staying on?

[Norman1]

Re: Panasonic TX-L42B6B No Picture

Unxtres, this is a forum to help people, and incidentally I have been in the tv business since the days of crt, so if you have nothing constructive to say,,,Go Away and take your toddlers mentality with you. Hello Dskall, when you first power the tv up I can see the menu with a torch, the screen is still flashing every two seconds, then shuts down and red led blinks steadily every 4 seconds. I have read it might be the led's,,be nice to check if it's a board though

[unxtres]

Re: Panasonic TX-L42B6B No Picture

Norman1 sorry if you take my answer as an attack, but if you are in business, than you need to know that multimeter is your friend, you have provided nothing about your tv... only serial number. So you expect that i`ll find psu, main model etc in google?

You need to provide few more info some photos, etc. check voltages

[Norman1]

Re: Panasonic TX-L42B6B No Picture

Good evening unxtres I will admit I have been out of the loop for a few years while I concentrated on the aerial install side of things, but I'm getting back into it again now. But I'm not sure what voltages should be on what pins, il get a few pics up.

[R_J]

Re: Panasonic TX-L42B6B No Picture

Here is a similar thread https://www.badcaps.net/forum/showth...ight=TX-L42B6B found by searching the model number. It's a good chance there is one or more bad led's in the panel.
That thread has a link to the manual, check the voltages on the LD board (LD1) plug, then check the voltages on (LD3)

[Norman1]

Re: Panasonic TX-L42B6B No Picture

Thanks R.J, il check a few voltages tomorow. This is the second potential led problem in a week. It's very annoying.

[dick_barton]

Re: Panasonic TX-L42B6B No Picture

Have you got a led tester. They are cheap enough and is a useful tool to have available.
As an example:-

https://www.ebay.co.uk/i/27226263323...6856138&crdt=0

[Hamie]

Re: Panasonic TX-L42B6B No Picture

This TV uses a LN series LG panel.

The LN series are famed for bad LEDs

[Norman1]

Re: Panasonic TX-L42B6B No Picture

I have the same model tv sat next to it in a 50" screen, not very good are they,