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Customer Review

95 of 103 people found the following review helpful
1.0 out of 5 stars Ruined by fluctuating brightness issue, 6 Aug. 2011
This review is from: Panasonic Smart VIERA TX-P46GT30B 46-inch Full HD 1080p 3D 600Hz Internet-Ready Plasma TV with Freeview HD and Freesat HD (Installation Recommended) (Electronics)
The GT30 SHOULD BE a top plasma, and there's a great deal to like about it, but like its VT30 brother it suffers from a serious problem which is likely to all but ruin your viewing experience. Namely its inability to transition smoothly from dark to bright scenes and vice versa (another reviewer referred to it as 'contrast shifts'). Instead of a clean transition the set has to think about it a moment, during which time you'll get on-screen shifts in brightness as the TV tries to adjust, and its EXTREMELY distracting and annoying. It's almost as though with every shift from light to dark someone is trying to compensate by adjusting the brightness levels using a remote.

It's actually a function of the way the screen is designed to be driven, so that less power is delivered when a darker picture is being delivered, but in practice it works very badly, with a significant delay being obvious while the set decides whether to dim the brightness or not. If the shift was instantaneous it wouldn't be an issue.

This problem has been reported on AV forums all over the Internet, and in the USA Panasonic are now sending out field engineers to solve the issue by flashing the onboard EPROM (there's no firmware download to correct it). Unfortunately, in the UK Panasonic are doing NOTHING to correct it, leaving the poor customer saddled with a TV that displays an annoying and frustrating flaw while claiming that the TV is performing to spec. Which is absolute nonsense, because nobody would design a TV that caused such annoying brightness shifts in content! And the problems are EXACTLY the same as those being suffered by North American customers, and which are now being fixed.

I STRONGLY caution people not to buy a GT or VT Panasonic plasma until this problem is addressed by Panasonic, because you will be frustrated beyond belief by this fault, and there is currently no way to fix it on the UK models.

You can read more on this issue by Googling 'Panasonic Fluctuating Brightness' or read reviews on of the TC-P50GT30, many of which explain just how bad this problem is.
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Showing 1-10 of 11 posts in this discussion
Initial post: 9 Oct 2011 00:56:31 BDT
R. Taite says:
Yes and you can google any other tv on the market and find problems with all of them. Remember most people that have a problem with any tv will post about it. But the vast majority of people who have no problem with there tv will not post about it. I have this tv and have none of the problems this reviewer talks about. If your thinking of buying any tv go to the shop and see it working and if your happy with it then buy it. Thats what i did and i am very happy with my panasonic TX-46GT30B

In reply to an earlier post on 1 Nov 2011 13:10:45 GMT
Last edited by the author on 1 Nov 2011 13:12:26 GMT
G Hooper says:
I have sent he fluctuating brightness problem on this TV and it is quite obvious on certain scene transitions. However, the latest firmware release is supposed to have resolved the fluctuating brightness issue. You can download it here:
or get it by starting up VieraCast if you have a wireless dongle.

Posted on 1 Jan 2012 07:45:11 GMT
Matt says:
So there is now a fix for UK versions of this TV supported by the manufacture?

In reply to an earlier post on 2 Jan 2012 19:15:15 GMT
Last edited by the author on 2 Jan 2012 19:17:21 GMT
Robert Brown says:
I am very happy with TX-50GT30B. Brightness fluctation was fixed by firmware update for UK/Euro model. It is the best TV I have seen and has been faultless since I installed it.

Posted on 12 Jan 2012 09:14:37 GMT
Last edited by the author on 12 Jan 2012 09:15:33 GMT
Rajworks says:
This is utter nonsense. Ive had this TV for a month now and ive never had any problems with the transitions from Dark to light. The picture is amazing and once you hook up a soundbar and the panasonic Blue Ray player to this tv you have the complete package.

Posted on 29 Jan 2012 13:37:01 GMT

In reply to an earlier post on 6 Mar 2012 09:25:54 GMT
W. Noble says:
Do you not read the other comments before posting? He experienced a problem fixed in a later firmware, so he wasn't talking rubbish, he was relaying his experiences. You and Rajworks could easily have posted your own experience without resorting to pointless trashing of the original reviewer.

Posted on 20 Jan 2013 12:50:33 GMT
Last edited by the author on 20 Jan 2013 12:57:32 GMT
K. Grunwald says:
Expert reviews for this tv available at TestFreaks

4 November 2011
Summary: The P46GT30 is the mid-sized option from Panasonic's acclaimed GT30 range, and as such could actually be the most widely desirable of the lot.
Pros: Crosstalk-free 3D, Peerless contrast, Good value for what's on offer
Cons: Not the brightest pictures, especially with 3D, Judder with some sources.
This expert gives it 9/10


30 May 2011
Summary: The GT30 has more contrast than the older GT20, has a great quality picture once you set it up in THX mode.
Pros: Great picture in 2D and 3D, Excellent contrast ratio: 5310:1 in THX mode, Almost no crosstalk, Very wide viewing angles, No Blackfloating in THX mode
Cons: Very average audio quality with muffled sound, Glossy screen picks up reflections, Power adaptor makes annoying noise, High energy consumption: 198 W in THX mode.
This expert awards it 8/10


7 April 2011
Summary: The 46-inch Panasonic Viera TX-P46GT30B is an outstanding TV. Deep black levels and rich colours make standard- and high-definition content look wonderful, while its 3D...
Pros: Extremely deep black levels, Stunning colours, Top-class 3D performance, Good range of features
Cons: Design could be slicker still, More Internet services would be welcome.
This expert award it 10/10

Other expert reviews are there but they are not in English though translation is available there.
Should you visit TestFreaks you will be able to read the full review by each expert and the user reviews are also there. I would not dream of buying a tv without going to TestFreaks first!

I like to buy a new tv every couple of years and have tried quite a few manufacturers but to my mind Panny plasma easily beats them all.
With all the issues regarding tv speakers i bought a pair of T10 speakers for around £25.00. They just plug right in are first class!! Speaker proplems solved for just a little money.

Posted on 12 May 2013 15:14:11 BDT
skidom says:
thank you for such a detailed feedback. People deserve to know,

Posted on 14 Jun 2013 19:11:43 BDT
total rubbish had mine 2years now perfect in every way!!!! very impressed with product
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