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Old 07-12-2021, 05:15 AM   #1
Djgh
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Default Samsung UN70NU6070 TV Issue - HELP!

Evening,

I started experiencing color/brightness issues with my 70Ē Samsung tv after a year or so from date of purchase. It doesnít seem as bright and the colors are a little off. Is this a backlight issue or something else? Iím pretty hands on, so I donít mind tackling the issue if I can pinpoint what it is.

Any help would be appreciated.

Model #: UN70NU6070

Video comparison:
https://youtu.be/6dNhwNy_lus
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Last edited by SMDFlea; 07-12-2021 at 06:36 AM.. Reason: Added UN70NU6070 to thread title
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Old 07-12-2021, 09:03 AM   #2
alfatv
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Yes, it could be backlight. Did you you run it at 100%?
In the meantime you can change color temperature setting in user menu and tune white balance in service menu. Reduce backlight to minimum possible setting.
For best results run the test with fully white screen.
If white is good, you can play with tint setting for colors, but better set it in the middle.
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Old 07-12-2021, 09:43 AM   #3
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by alfatv View Post
Yes, it could be backlight. Did you you run it at 100%?
In the meantime you can change color temperature setting in user menu and tune white balance in service menu. Reduce backlight to minimum possible setting.
For best results run the test with fully white screen.
If white is good, you can play with tint setting for colors, but better set it in the middle.
Appreciate it the advice. Iíve played with all the settings, performed a picture and power reset, and even spoke with a Samsung representative. None of those were helpful. I may end up replacing the backlight due to it being inexpensive but was still hoping someone could pinpoint the exact issue.
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Old 07-12-2021, 09:07 PM   #4
R_J
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

It is unlikely to be the backlight, I would first check the source, possible bad hdmi cable? The next thing I would check (reseat) is the LVDS cable between the main board and t-con.
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Old 07-13-2021, 12:38 AM   #5
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Change the picture settings to vivid or standard. See if that makes any difference.
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Old 07-13-2021, 05:39 AM   #6
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by R_J View Post
It is unlikely to be the backlight, I would first check the source, possible bad hdmi cable? The next thing I would check (reseat) is the LVDS cable between the main board and t-con.
Ordered a new tcon board so letís see what happens.

Quote:
Originally Posted by ducky29 View Post
Change the picture settings to vivid or standard. See if that makes any difference.
Lol thanks for your Input.
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Old 07-13-2021, 07:25 AM   #7
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Probably a gamma issue on the tcon. Think you're on the right track.
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Old 07-13-2021, 12:14 PM   #8
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by mmartell View Post
Probably a gamma issue on the tcon. Think you're on the right track.
+1
It does look as though the black level is washed out.
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Old 07-14-2021, 11:02 PM   #9
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Can you go this site and post pictures of gradients white red green blue?
https://www.eizo.be/monitor-test/
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Old 07-16-2021, 06:05 PM   #10
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Replaced the tcon board. Itís definitely better but not perfect, then again Iím comparing it to the picture on my iPhone. Itís still a little saturated (maybe thatís the word)
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Old 07-16-2021, 07:56 PM   #11
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

People’s faces look like they have a bad tan
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Old 07-17-2021, 10:14 AM   #12
R_J
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Do you have pictures of both t-con boards? it is possible they could be for different models. You can't always go by the BNxx-xxxxxx number you need to use the number on the white sticker. I suspect there is an eeprom on the board and it bight be programmed for a different panel or main board

Last edited by R_J; 07-17-2021 at 10:17 AM..
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Old 07-19-2021, 06:36 AM   #13
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by R_J View Post
Do you have pictures of both t-con boards? it is possible they could be for different models. You can't always go by the BNxx-xxxxxx number you need to use the number on the white sticker. I suspect there is an eeprom on the board and it bight be programmed for a different panel or main board
Not anymore. Old board is long gone but I purchased the new board based off the sticker on the back.
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Old 07-24-2021, 12:18 PM   #14
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Another thing I noticed is that when I first turn the tv on, the colors appear to be perfect but slowly goes back to its original color issue
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Old 07-24-2021, 08:19 PM   #15
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).
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Old 07-26-2021, 08:10 AM   #16
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by frannyjunk View Post
Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).
The led strips could cause the color discrepancy? Am I wrong to assume the leds only assisted in fixing dark spots on the screen.
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Old 07-27-2021, 03:46 PM   #17
ducky29
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Yes they do but I have never found a samsung with that fault. Mostly vestels and LG. The picture will get blueish but I don't think this is the case.
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Old 07-27-2021, 04:01 PM   #18
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

turn the red up and see what happens
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Old 07-28-2021, 05:47 AM   #19
Davi.p
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Much probably bad backlight, must check power supply output tensions for the leds, must be in the range, if not it can ruin the led phosphors by too much tension. If those are ok so are bad leds.
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Old 07-28-2021, 06:40 AM   #20
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Default Re: Samsung UN70NU6070 TV Issue - HELP!

Quote:
Originally Posted by frannyjunk View Post
Could be the backlights. The phosporous on some of the LEDs may be failing causing a shift towards blue/purple (or pink before it gets to blue/purple).
+1
I totally agree with that.
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