55as802b Pink tint

[thuss]

Hi

I was after some advice. My mates panasonic 55AS802b has a pink tint to it especially noticeable on a white background.

We have ran the lcd pattern test and all the other colours are fine apart from the white which is pink.

My question is, can this be altered via the service menu through the whitebalance section r-gain g- gain etc?

Is it the lcd screen or the backlights going faulty?

from the service manual it states The test pattern is created by the circuit in LCD Panel.
In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal.
If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.

(I assume its the lcd from the back of the tv through the vents the backlights do look pinkish)

Any advice would be appreciated (My phone will not allow me to upload any photos at the moment)

[Diah]

Re: 55as802b Pink tint

blue tint yes we saw caused by LED BL. but PINK ..LOL still not. it may the Red Gain little high .. calibration white balance are the answer if it was really PINK

[thuss]

Re: 55as802b Pink tint

blue tint yes we saw caused by LED BL. but PINK ..LOL still not. it may the Red Gain little high .. calibration white balance are the answer if it was really PINK

Hope these photos help - but when i do the routine picture test - picture is fine

[nomoresonys]

Re: 55as802b Pink tint

Not pink, that's purple, usually caused by overdriven backlights, if that's what it is, the cure is new backlights and turning them down as low as can be tolerated.

[Diah]

Re: 55as802b Pink tint

not pink, that's purple, usually caused by overdriven backlights, if that's what it is, the cure is new backlights and turning them down as low as can be tolerated.

+1

[Diah]

Re: 55as802b Pink tint

Hope these photos help - but when i do the routine picture test - picture is fine

could you show us please with photos ?

[dick_barton]

Re: 55as802b Pink tint

As nomoresony says in post #4 the problem is that the led's have turned towards blue emission. If you search the forum for "blue leds" you can see examples.
Replacing the leds and turning down the backlight is the solution

[thuss]

Re: 55as802b Pink tint

As nomoresony says in post #4 the problem is that the led's have turned towards blue emission. If you search the forum for "blue leds" you can see examples.
Replacing the leds and turning down the backlight is the solution

Thanks for the info

[thuss]

Re: 55as802b Pink tint

9

Thanks for the info

Couldn't upload photos in one go the screen test starts with what should be white (pink) see above then rotates through the rest and ends up back with white(pink)

[thuss]

Re: 55as802b Pink tint

Thanks for the help -one thing i noticed is that it doesn't effect it whilst its doing the picture/sound test .

[Diah]

Re: 55as802b Pink tint

Thanks for the help -one thing i noticed is that it doesn't effect it whilst its doing the picture/sound test .

those photos cant approve to you the issue we talked about LED back light
take out the back cover.. then you will be able to see thru many wholes the back light if its colored or pure cool white as it should be

[thuss]

Re: 55as802b Pink tint

Thanks for all the help it was the backlights

[dick_barton]

Re: 55as802b Pink tint

To help stop them from failing again, turn down the "Backlight" as low as possible for viewing.

[thuss]

Re: 55as802b Pink tint

Yes thanks set at 80