Do LG plasma's have a limiter on them or...? - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 
Thread Tools
post #1 of 11 Old 03-14-2019, 05:10 PM - Thread Starter
Member
 
seikon's Avatar
 
Join Date: Feb 2014
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Liked: 14
Do LG plasma's have a limiter on them or...?

I'm not officially at home right now to check but I'm pretty confident the TV I have is an LG 60PB5600. I bought it about 5 years ago.

Anyway, for a low end TV, the plasma picture is still pretty sharp BUT...

Why is it that when I first turn the TV on the picture looks nice, crisp and dark (like vivid good dark), then after probably a minute or so it's like it hits some sort of threshold and the TV brightens at least 20%. The picture is still nice, but not like it was when I first turned it on.

This doesn't seem to be a flaw in the TV, as it has done that from day 1. I think I remember reading something about the LG plasma's having some sort of limiter and that's why it does that.

Can anyone shed light on this?
seikon is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 03-15-2019, 02:29 PM
AVS Forum Special Member
 
RWetmore's Avatar
 
Join Date: Jan 2006
Location: Brick, New Jersey
Posts: 4,254
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 654 Post(s)
Liked: 393
If I understand you, what you mean is rising black level -- not getting brighter (higher contrast). Is this correct?
RWetmore is offline  
post #3 of 11 Old 03-15-2019, 02:52 PM - Thread Starter
Member
 
seikon's Avatar
 
Join Date: Feb 2014
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Liked: 14
No actually. I would say the whole screen just brightens 20-30%.
seikon is offline  
Sponsored Links
Advertisement
 
post #4 of 11 Old 03-15-2019, 04:13 PM
AVS Forum Special Member
 
RWetmore's Avatar
 
Join Date: Jan 2006
Location: Brick, New Jersey
Posts: 4,254
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 654 Post(s)
Liked: 393
Quote:
Originally Posted by seikon View Post
No actually. I would say the whole screen just brightens 20-30%.

So why is this a negative or problem?
RWetmore is offline  
post #5 of 11 Old 03-15-2019, 04:17 PM - Thread Starter
Member
 
seikon's Avatar
 
Join Date: Feb 2014
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Liked: 14
I've lived with it, so I mean it's not a huge issue. It's almost a curiosity at this point.

When first turned on the picture is outstanding. When it brightens, it's only very good.
seikon is offline  
post #6 of 11 Old 03-15-2019, 05:38 PM
AVS Forum Special Member
 
Bruce2019's Avatar
 
Join Date: May 2013
Location: Vienna
Posts: 1,043
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 549 Post(s)
Liked: 312
Quote:
Originally Posted by seikon View Post
I've lived with it, so I mean it's not a huge issue. It's almost a curiosity at this point.

When first turned on the picture is outstanding. When it brightens, it's only very good.

This is a very unusual thing...


Does this also happen without a video source?.. Plug your video source off, and see if it still happens.. Does it show up on every channel/input? What source are you using? What picture setting? Can you make a picture from your screen that shows the problem?


Can you make the picture darker with lowering the brightness setting? Maybe the tv is fed with a RGB full video signal vs. a RGB limited signal.. (I explain later) But in that case you could just reduce the brightness and black level should be perfect again..

2013 Panasonic TX-P42STW60 PDP
2009 Panasonic TX-P42S10E PDP
Bruce2019 is online now  
post #7 of 11 Old 03-16-2019, 07:45 AM
AVS Forum Special Member
 
RWetmore's Avatar
 
Join Date: Jan 2006
Location: Brick, New Jersey
Posts: 4,254
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 654 Post(s)
Liked: 393
I think the issue here is rising black level, not rising contrast.
RWetmore is offline  
post #8 of 11 Old 04-04-2019, 01:02 PM - Thread Starter
Member
 
seikon's Avatar
 
Join Date: Feb 2014
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 27 Post(s)
Liked: 14
Quote:
Originally Posted by RWetmore View Post
I think the issue here is rising black level, not rising contrast.
Maybe it is just rising black levels.

Is there any good explanation on why it always happens after first having the TV on for a minute or so? It's always been like that.
seikon is offline  
post #9 of 11 Old 04-04-2019, 01:49 PM
AVS Forum Special Member
 
RWetmore's Avatar
 
Join Date: Jan 2006
Location: Brick, New Jersey
Posts: 4,254
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 654 Post(s)
Liked: 393
Quote:
Originally Posted by seikon View Post
Maybe it is just rising black levels.

Is there any good explanation on why it always happens after first having the TV on for a minute or so? It's always been like that.

Not that I know of, no. And there's probably nothing that can be done about it, unfortunately.
RWetmore is offline  
post #10 of 11 Old 05-29-2019, 09:09 AM
Member
 
Join Date: Dec 2014
Location: Niagara Falls Canada
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked: 0
I have the same LG 5600 as you and it does the same thing. It has done it from day 1 when I bought it new. It must be something built in from LG. I don't think you can turn it off or defeat it in any way.
monty4 is offline  
post #11 of 11 Old 05-29-2019, 09:15 AM
Advanced Member
 
Jawaburger's Avatar
 
Join Date: May 2014
Location: Champaign, IL
Posts: 532
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 206 Post(s)
Liked: 201
I fail to see why you can't just calibrate the image to look like it does when it first turns on. Of course you will need to wait a minute before you start the calibration.

Sharp LC-80LE844U | Marantz BD8002 | Marantz AV8003 | Marsh Sound Design A400s (FL/FR) | Marantz MM7055 (C/SL/SR) | Phase Tech PC 9.1 (FL/FR) | Phase Tech PC 3.1 (C/SL/SR) | Dual PSA S1811 Subs
Jawaburger is online now  
Sponsored Links
Advertisement
 
Reply Plasma Flat Panel Displays

Tags
blacklevel , lgplasma , plasma

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off