Vertical light banding on edges of Panasonic 50CX802

[jonnyapps]

Hi,

Had some great help on here with a previous TV so I'm back!

Recently picked up a 50 inch Panasonic CX802 and it has bright vertical bars on both edges, which I have pictured

The image is an exaggerated version of the effect (finding the worst shade in Photoshop and over exposing the photo). It is only the far right/left brightest strips that are the problem when watching.

Frustratingly it also has an effect on colour saturation in those areas and is visible when watching films etc.

I have tried many combinations in the picture settings of the TV to no avail. None of the preset modes do away with the issue, nor does following AVForum's recommended settings.

I suspect there's not a lot I can do about it but I'm not afraid to get my hands dirty if there are any options so please let me know if you have any suggestions.

Thanks for your time.

[freakaftr8]

Re: Vertical light banding on edges of Panasonic 50CX802

Need to see a picture with content on its screen to further diagnose. From here it looks rather normal if you superimposed the picture. Could be LED backlight bleed If it is edge lit

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

Need to see a picture with content on its screen to further diagnose. From here it looks rather normal if you superimposed the picture. Could be LED backlight bleed If it is edge lit

Sure, I'll take some photos/footage tonight when home.

I find it odd because most other complaints about the TV are the opposite. This for example.

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

Need to see a picture with content on its screen to further diagnose. From here it looks rather normal if you superimposed the picture. Could be LED backlight bleed If it is edge lit

The following are all 'correctly' exposed and match my viewing experience.

Here is a photo on a menu:

Here is a video with prevalent greys: https://i.imgur.com/HhjykbO.mp4

and here is the issue in action, with paler sides:



I have video footage of the scenes those are grabbed from too but it's stubbornly refusing to upload currently.

[tom66]

Re: Vertical light banding on edges of Panasonic 50CX802

It's probably backlight non-uniformity and unfortunately, there's probably very little you can do.

[freakaftr8]

Re: Vertical light banding on edges of Panasonic 50CX802

Wow that's quite a bit of backlight bleed! Does this change with a gentle twisting motion back and forth? That's crazy for a high end tv!

[budwich]

Re: Vertical light banding on edges of Panasonic 50CX802

what are the chances that someone else was in the set and changed out some of the leds.

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

what are the chances that someone else was in the set and changed out some of the leds.

Plausible in so much as I bought it secondhand. Thankfully I only paid £350 for it. Not afraid to open it up and find out, if it would help anything.

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

Wow that's quite a bit of backlight bleed! Does this change with a gentle twisting motion back and forth? That's crazy for a high end tv!

Nope. No change. I've also tried loosening/tightening the screws in case it was a pressure thing.

[freakaftr8]

Re: Vertical light banding on edges of Panasonic 50CX802

I would say the diffusers are no good. Possibly partially melted from heat from the led's. This is considering that others seem to have darker bars on each sides. Design IMHO

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

I would say the diffusers are no good. Possibly partially melted from heat from the led's. This is considering that others seem to have darker bars on each sides. Design IMHO

Unfixable?

[diif]

Re: Vertical light banding on edges of Panasonic 50CX802

Worth stripping the TV to have a look. I've just repaired edge LEDs on two 50" Panasonics.
The first one went smooth, the second and I mustn't have put it back properly as there is light leakage on the right hand side where my LEDs are. Either the thick plastic that transmits the light is out of place or the LED strips aren't sitting flat.

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

Worth stripping the TV to have a look. I've just repaired edge LEDs on two 50" Panasonics.
The first one went smooth, the second and I mustn't have put it back properly as there is light leakage on the right hand side where my LEDs are. Either the thick plastic that transmits the light is out of place or the LED strips aren't sitting flat.

Can't say I've ever tried such a thing before. I'll have a look around for some tutorials and calculate the odds of catastrophic failure!

[kca]

Re: Vertical light banding on edges of Panasonic 50CX802

Did you ever have any luck with this, jonnyapps?

[jonnyapps]

Re: Vertical light banding on edges of Panasonic 50CX802

Did you ever have any luck with this, jonnyapps?

Sorry for the delayed reply.
I didn't take it any further and have been tolerating it for now.