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Original topic:

Q7F Judders and white flashes

(Topic created on: 16/04/18 10:49)
Phil12
Voyager
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TV

Hi

 

Getting more annoyed with our Q7F TV, we were hoping some firmware updates would improve things but that hasn't happened.

 

1) White flashes, every now again, sometimes a few minutes apart, sometimes hours apart, on a scene transition there is a brilliant white flash, i.e. the screen shows for a fraction of a second or perhaps a single frame, a complete white screen.  This happens from all sources and is random but usually always at an edit, going back and playing the same part again it doesn't happen, its as though the TV can't process quick enough over a cut.

 

2) Judders, typically on pans, at the start of the pan the picture will freeze for a couple of frames then jump and catch up, this is often repeatable but not always.

 

We've tried changing various motion settings and judder reduction settings which have done nothing to stop the problems.

 

Are these problems happening for everyone on these TVs?

 

Regards

 

Phil

 

 

61 REPLIES 61
Leg2ion
Pathfinder
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TV

Hi,

 

Not noticed anything on our QE40Q7F - and we have any motion settings turned off completely. Not sure about the juddering, but have you tried disabling any eco settings for the flashes?

 From 'the book':

If your Samsung Television is flickering or dimming sporadically, you may need to disable some of the energy efficiency features. Disable Energy Saving Mode ( Settings General Eco Solution Energy Saving Mode), Ambient Light Detection ( Settings General Eco Solution Ambient Light Detection), or Motion Lighting ( Settings General Eco Solution Motion Lighting).

Phil12
Voyager
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TV

Hi

 

I've still been suffering white flashes during scene transitions and have done some troubleshooting, a shame Samsung hasn't.

 

The flashes only happen when:

 

Picture mode = Movie

Auto Motion Plus Settings are on with Judder and Blur settings set to 1 or higher.  This is with the very latest firmware 1230, and has been present with all prior versions.

 

So this explains why only some people have seen this problem

 

So after lots of testing I've found if I set the Picture mode to Natural, then make the same picture adjustments that Movie mode applies under Expert picture settings, I get an identical picture to the Movie picture mode, but no flashes.  Switch back to Movie mode, and it starts the white frame flashes again.

 

So Samsung, please get your firmware guys to see what is different with the Movie picture mode, and test in that mode with Auto motion settings enabled, at some point you will find footage that causes the white flashes at scene changes.

 

Regards

 

Phil

 

 

 

Leg2ion
Pathfinder
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TV

Good work Phil.  Admittedly still not seen any white flashes on our set, but still have Auto Motion Plus turned firmly off - as it made the picture under certain circumstances look absurd.

 

I will upgrade to 1230 shortly and see if that makes any differences (good or bad) to what is currently being viewed.

 

What, if any. differences have you noticed sinced upgrading?

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Phil12
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Hi

 

You will not see the white flashes with motion plus turned off even in Movie mode.

 

I've not see any changes with the new firmware, and frustratingly Samsung still refuse to supply a list of changes the firmware is applying or fixing so we will probably never know.  I'll not buy another Samsung TV after this one, very disappointed in their sets.

 

Regards

 

Phil

 

 

valleyboy22
Pathfinder
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I think its a common thing with the judder issue with samsung. I returned my curved tv because it was really bad in my opinion. Paid a little extra and got the 120hz samsung and it had more settings to play around with and seems better give or take.

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Waynimus
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In regards to the white flashes, I have noticed something similar in my KS TV too. Perhaps it's the same issue?

 

A good repeatable example of this, should anyone care to try, is to find a film Blu-ray, Netflix etc. and skip to the end credits.

 

Instead of just the scrolling credits try and find a film that displays the actor's name, and fades to black before displaying the next name. It seems that whenever the TV has a full black image onscreen that this white flash occurs, as such easily spottable during end credit scenes.

Phil12
Voyager
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TV

Hi

 

After many hours watching I can confirm the white flashes at scene edits have gone for us since changing from Movie picture mode to the Natural picture mode.  It's been possible to enjoy several films without periods of feeling like someone is taking photos of us with a flash camera!

 

Therefore this is [another] a software bug that needs fixing but of course will never be fixed.  How on earth this has got through testing and released to the general public is a testiment to how good (well bad) Samsung is at quality control.

 

The only annoying thing is the Natural picture mode can't be made to look exactly like Movie Mode as it has sone non defeatable colour processing.

 

Judder still isn't very good, what is annoying is judder is added where it shouldn't be, even when footage is 50i or 60i and should de-interlace and be judder free, the TV introduces judder by seemingly only de-interlacing to 25 frames a second.  At the start of a camera pan, it will often try and stop the pan happening by showing a few of the same frames before jumping and catching up.  It's truely rubbish.

 

Regards

 

Phil

Leg2ion
Pathfinder
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TV

Just looked at the online support page and I see you can now download firmware 1221, whereas previously it was 1230?

 

Anyone any idea as to why the retro move. I am guessing those that have already flashed the 1230 firmware will not be able to use the 1221?

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Phil12
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Hi

 

Yes it was taken down with no explanation from Samsung surprise surprise, who think their customers deserve to know nothing.  We don't know what 1230 had changed as they don't provide any release notes with their firmware updates, not an industry norm, but it is for Samsung.  So without knowing what the firmware changed, we can't guess on why it might have been taken down.  I did read some reports that it broke some smart TV apps, but then most firmware updates from Samsung have broken something.

 

I updated to 1230 whilst it was available, and not noticed any issues (or fixes either!), and you are correct in that you can't go back to an older version, so if anyone is affected by the problem which meant they took it down, has been stuck with that problem for a while now.

 

Of course Samsung should have rebuilt firmware version 1221 as version 1231 so it would be accepted by our TVs as a new version and we could put it back on, however Samsung hasn't done that.

 

Regards

 

Phil

 

 

 

 

Wayne10
Explorer
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TV
My 55MU7000 has exactly the same white flashes symptoms. Trying Natural Mode now.
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Wayne10
Explorer
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As as observation, i've noticed straight away that Natural Mode adjusts almost instantly from/to a brighter scene/frame change, as a almost similar bright white flash. This is less disconcerting though. Turning on Standard Mode stops this, but then introduces the chance if random white flashes.

 

Adjusting the Picture Expert Settings doesn't help, or mitigate this change.

 

This random, camera like, flash in Standard Mode though, happens after a frame/scene change and interupts and flashes over the next scene. This is very disconcerting.

 

It seems to do it in blocks of solid colour of part of the picture too sometimes.

 

I assume it is a Samsung picture algorithm/processing design.

 

Over the years i have seen different ways of tvs handling contrast variations in picture output. Some constantly adjust the contrast, but the the picture brightness is going up and down all the while.

 

I had a Philips CRT once and if the top/bottom part of the picture was a strip of bright white, it would constantly make the whole screen flash bright white on and off like an SOS flashlight. I managed to turn this off though by turning down the Contrast. I lost a bit of brightness in the picture.

Wayne10
Explorer
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Just tried Dynamic Mode and the instant flash at scene changes using Natural Mode has gone. Trying that now.

 

The brilliance of the cricket players whites is unreal.

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Rymaan
Explorer
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There is a firmware release for the MU7000 version 1240.7, I too was duped by Samsung themselves to update my TV to 1230 to try and fix an issue I have with the screen blacking out for a second or two every now and then (Which I have been trying to get Samsung to sort) but that is another story. To my surprise only to find a few days later they pulled it off the site because it wasnt working with certain features that firmware. Those who are brave enough to update to the firmware which was released today for the MU7000 and possibly other models. What this update does I have no idea as it doesnt list the fixes or improvements, think you can get them from the US site maybe. But by going by Samsungs previous attempts I doubt it will fix or improve anything anyway.

My 55MU7000 has also suffered these flashes from new and now has an additional issue with random black screens which appear on 4k HDR sources for 1 second which Samsung dont seem to know how to fix.

Most certainly wont be buying another Samsung TV after the countless issues ive had with this one & what seems other models.

Wayne10
Explorer
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Just been trying Dynamic Mode with Auto Motion Off and saw White Flash.

 

Trying Natural Mode next.

 

Also, any adjustments made in Dynamic Mode, transfer to HDR Mode too.

Phil12
Voyager
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TV
Hi

We are still using Natural Mode but with contrast settings tamed down in picture settings so it appears as close to the more correctly calibrated Movie Mode, and not had a white flash since. We don't see any contrast changes on our Q7F in Natural mode, and it matches quite closely Movie Mode except the colours are a bit more processed and more punchy than they should be.

I don't expect these flashing problems to ever be fixed, it's likely hardware bugs in their own designed chips which they have no choice but to continue to use as it's too costly to fix. Samsung TVs are bug ridden, you only buy a Samsung TV the once, as most people don't make the same mistake twice.

Regards

Phil

Wayne10
Explorer
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What level number is your Contrast Phil12?

 

Are we talking all Samsung tvs, or just the current 4K ones? I was thinking of getting a Full HD set.

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NewtonUK
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My 49MU6400 does this as well on 4K sources through HDMI.

 

I had the screen replaced not long after I got it due to light bleed but the replacement screen is now worse than the original one. It looks like two spotlights shining on the left and right hand sides.

 

More recently Samsung has replaced the mainboard due to this issue, but it stills persists!  It's only started recently, but the replacement mainboard hasn't fixed it.

 

Very disappointed overall with the TV. I've never seen backlight bleed like this on anything.

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NewtonUK
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I should add that I get the flashes on Game mode as well, both with an Xbox One S and a One X.

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Wayne10
Explorer
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Regarding the flashes, have you tried adjusting the picture modes/settings?

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Phil12
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Hi

 

I've got the lasted 1240 firmware now on my Q7F TV and switched back to movie mode to test for flashes in the thin hope it might be fixed.

 

Anyway couldn't watch it in that mode as the posterisation over peoples faces made it look like they were made of plastic, with highlights completely blown out, and when others in the family mention it straight away I know it's not my imagination or me being fussy.  So we switched back to Natural mode  that doesn't have this issue.  It might be some other settings like contrast need turning down when in Movie mode, but as that mode is suppose to be set up pretty good out the box and hasn't been adjusted, it shouldn't have this obvious issue.  So looks like more bugs introduced than fixed, what a surprise.

 

Samsung, your TVs and quality control is truely shocking, you deserve your TV sales dropping like a stone.  Where is the beta testing, calibration checks, and release notes on your firmware so we can identify what change may have broken something to feed back constructively.   Tumble weed passes.....

 

My first 4K TV is a Samsung, never again.

 

Regards 

 

Phil