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New TCL TV - problem with auto brightness! Cant turn off!

engelien

Member
Hi!
I have a problem with my new TCL ep685 - Whenever a scene goes dark, the screen dims darker. Its like some sort of auto brightness is always turned on.
I can even see it when Im in the main menu and opens a grey/ dark menu - the screen will dim darker.

Every "auto" settings is off, and I have tried every preset available. (movie, sport, HDR, Dynamic etc)
Is there a way to turn this OFF?

I would really appreciate your help!
 

arcanux

Member
Same problem here TCL55EP660

Have a friend that have the same model as mine (TCL42EP660) and the "problem" is exactly the same.

In HDR content the "problem" is less visible but in "normal" content, sometimes the TV acts like a Christmas tree with the constant flicker of the backlight/contrast! In movies or show credits the panel goes completely berserk...

In HDR, if the panel goes too long with darker image, the panel remains in it´s dim preset and never recovers... only a TV reboot normalize the dimness...

In the Smart HDR image preset, it´s less visible like it was constantly in HDR mode but then, the problem i described above kicks in on prolonged darker image situations...


As Engelien already said, all possible options were tested and it seems impossible to switch off that behavior. I think it may be related to the Micro Dimming engine.



Already sent a couple of emails to TCL Europe support... all of them were completely ignored! Never got a response...



If someone can shed some light on the matter, would be much appreciated as TCL Europe themselves can´t be bothered...
 

[email protected]

Well-known Member
Don't have your set but remember a little while ago someone posting a thread about something similar.

Quick search in this forum comes up with this

 

engelien

Member
Same problem here TCL55EP660

Have a friend that have the same model as mine (TCL42EP660) and the "problem" is exactly the same.

In HDR content the "problem" is less visible but in "normal" content, sometimes the TV acts like a Christmas tree with the constant flicker of the backlight/contrast! In movies or show credits the panel goes completely berserk...

In HDR, if the panel goes too long with darker image, the panel remains in it´s dim preset and never recovers... only a TV reboot normalize the dimness...

In the Smart HDR image preset, it´s less visible like it was constantly in HDR mode but then, the problem i described above kicks in on prolonged darker image situations...


As Engelien already said, all possible options were tested and it seems impossible to switch off that behavior. I think it may be related to the Micro Dimming engine.



Already sent a couple of emails to TCL Europe support... all of them were completely ignored! Never got a response...



If someone can shed some light on the matter, would be much appreciated as TCL Europe themselves can´t be bothered...
Same here, I have sent several mails to TCL EU and US, and gotten no answer.
If someone here finds a solution in the future, please send me a message!
 

arcanux

Member
Same here, I have sent several mails to TCL EU and US, and gotten no answer.
If someone here finds a solution in the future, please send me a message!
I´ve updated the Software to the newer one (RT51_Android P_V252.zip) and i can see some improvements...
Still on the matter of the update, forget the option to check updates from the network(directly from the TV)... it always says you have the most recent one :)

On the site i´ve downloaded the most recent one and been testing it...

TCL55EP660 - http://www.mediacenter.tcl.eu/uploads/common/RT51_Android P_V252.zip


Noticed 2 things right away:

1 - The TV boots a bit faster.
2 - If you switch off the TV while on Android TV Menu or App, when you turn it on again, it defaults to the Android TV Menu. Nice addition on my book... On previous Software (V179) always defaulted to the last Input.

On the subject of the Micro Dimming problem(assuming that is the issue), the "problem" persists but it´s less jarring as the transitions are less abrupt... On HDR content, the problem is not present anymore or i didnt notice it yet...

I think it´s apparent by now that it´s probably not a bug but simply the way the software manages the dimming... I wish TCL Europe could find a way to add the choice to disable it completely even if that resulted on loss of brightness/contrast control.

Hope that helps...
 

engelien

Member
I tried the new software update - no difference on the auto dimming problem. TCL TV still dims brightness darker when a dark scene appears. Or a dark window in the app menu appears. I have tried the new update with every preset ( smart hdr, sport, movie standard..)
 

arcanux

Member
I tried the new software update - no difference on the auto dimming problem. TCL TV still dims brightness darker when a dark scene appears. Or a dark window in the app menu appears. I have tried the new update with every preset ( smart hdr, sport, movie standard..)
Yeap, it´s almost certain that it´s not a Bug but simply the way the Micro Dimming engine handles things... TCL Europe sucks big time compared to the US division. Such a shame...
 

Nhtmd2

Member
Seems like its a TCL issue.
I have a 55P8M and it presents exactly the same issue as yours.
Crazy/Random Micro Dimming in dark scenes through HDMI and USB.
Latest update applied.
Send some mails to TCL, but no answer
 

carpif

Member
I bought the 55P8M model here (Arg.) and had exactly the same issue, actually I had to replace the first device that I bought since the flickering was terrific and very noticeable. In the second unit that the retailer gave to me the issue is much less evident but anyway visible and in some way make me worry if could be worst in the future.
As all of you mentioned, I've tried with many different combination of parameters and always the same result, in very dark scenes with some white content the brightness goes crazy.
The retailer gave the chance to try it this new unit and in case I'm not satisfied I could change for other brand (more expensive obviously), I always have Samsung TVs and this is my first TCL, I'm really happy with the Android TV integration ... soooo ... I don't know what to do.
 

Slovakian

Novice Member
I have same problem with dimming on 55ec780. I can not switch off this dimming. I try software update but not help. TCL support please make new update.
 

Jeanremix

Member
Hi to all,

Exactly the same problem here on a new TCL 50ep680.
Brightness drops with dark scenes, and increase a lot for biegtg
Every dynamic option is removed, and I can see it in all modes.

Hope to find a solution soon!
 
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