Panasonic TX40JX850B is rated 4.7 out of 5 by 62.
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Panasonic TX40JX850B

40 inch 4K Ultra HD HDR Smart LED TV Freeview Play

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Disabled assistance

All products that are available to purchase on the Richer Sounds website can be delivered free to blind, partially sighted or those with a disability. Find out more

Please contact web after sales for more info.
For delivery of in-store only deals, please contact your local store for more details.
Ts&Cs apply - see our delivery page.
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”The Panasonic TX-40JX850 is easily one of the better small 4K HDR TVs currently available.” ’Trusted Reviews’ - Recommended

New HCX AI Processor

At the heart of this Panasonic 40 inch TV is an intelligent new processor. Delivering accurate colour, contrast and pin-sharp clarity, the processor works with the panel to produce the best picture – whatever the genre. The AI (Artificial Intelligence) processor detects the content and adjusts the setting to suit. Watch sports, for example and the TV recognises this and selects the best settings for fast-moving action.

HDR Bright Panel Plus for super-sharp images
Once the signal has been analysed by the powerful HCX AI processor, it’s sent to a screen that does it justice – HDR Bright Panel Plus. Using extra-bright LED backlights, this screen goes brighter and therefore enhances contrast, giving superb levels of contrast – even in conditions of high ambient light.

Local Dimming Pro – enhanced contrast
Working in conjunction with the HDR Bright Panel Plus, Local Dimming Pro gives more control over the picture contrast. By being able to dim particular areas of the image, contrast is enhanced, making images look even more natural and lifelike. The processing is so fast and seamless, you’ll notice nothing except an incredible sense of image realism.

Dolby Atmos and Cinema Surround for immersive sound
Compatible with Dolby Atmos sound, this Panasonic TV creates a more immersive, enveloping sound. Fitted with a 20 watt amp, the 40JX850B produces room-filling sound. For even more immersion, select the Cinema Surround setting, or use the HDMI eARC or optical digital output to add a soundbar or base.

HDR10+ Adaptive – ultimate detail in all lighting conditions
HDR10+ Adaptive takes HDR10 and to the next level, making it the ultimate HDR-type picture processor. HDR10+ Adaptive uses light sensors inside the TV to adjust the picture quality for the best contrast. This improves the picture’s brightness, without ‘washing out’ the depth. You get a consistent picture quality, however light or dark your room is.

Multi-format HDR support for a stunning picture from all sources
As well as HDR10+ Adaptive, the TX-40JX850B also offers multi-format HDR, including HDR10+, HDR10, HLG and HLG Photo. HDR10+ offers scene-by-scene HDR mastering for the truest, most accurate HDR picture technology. Each scene is optimised, meaning the maximum amount of detail is shown – even in the brightest or darkest moments.

See the picture exactly as originally intended, with Filmmaker Mode
Featuring exclusive technology from Panasonic, Filmmaker Mode makes the best of any movie. Designed in collaboration with filmmakers and Hollywood studios, Filmmaker Mode lets you experience the cinematic vision, exactly as the director intended. Overriding the TV’s own motion and picture processing, Filmmaker Mode presents the correct aspect ratio, colour and frame rate – just as the filmmakers intended. Panasonic exclusively add Intelligent Sensing to Filmmaker mode, so that the picture reacts intelligently to changes in light, automatically giving you the most cinematic picture possible, whether the room is bright or dark.

Smart TV made easy with HomeScreen 6.0
The latest version of Panasonic’s HomeScreen makes all the smart functions even easier to access. When selecting content from your favourite streaming apps, the system offers thumbnail images, making it easier to find your favourite programme. Support for Google Assistant and Alexa means you can also find content via voice command. The new My Scenery feature offers a selection of background images and videos.

Search, stream and play
When it comes to Smart TV flexibility, the TX40JX850B has all the features you need. As well as the popular streaming apps, the TV also offers a full web browser. DLNA certified streaming makes it easy to transfer music and video files from your home computer, laptop or NAS drive to the TV. Also standard is Swipe and Share functionality. Swipe and share lets you use the Panasonic Remote TV app for smartphone media sharing. By using the app on your smartphone or tablet, you can easily stream pictures, 4K videos and music straight to the TV - no cables required.

Listen with two pairs of headphones, with Dual Bluetooth Connection
New for 2021, Dual Bluetooth Connection lets two of you listen, simultaneously, with wireless Bluetooth headphones. Perfect for immersive listening when the kids have gone to bed, Dual Bluetooth Connection helps keep the action intense, without disturbing others.

For a compact TV with full-size tech, check out the Panasonic TX-40JX850B.

Please note, this Smart TV features third party Apps. These Apps may be modified or withdrawn at any time. There may also be a delay in launching some of the featured Apps. Catch-up TV Apps may vary by region. The function and availability of apps is not covered by the manufacturer’s or Richer Sounds’ guarantee.
Screen Size
Screen Technology
Picture Quality
LED Backlight
LED - Edge
Local Dimming
Motion Processing
BMR 1600
Pixel Resolution
3840 x 2160
HDR Formats
Dolby Vision, HDR10, HDR10+, HLG
Panel Bit Depth
10 bit (8 + 2 FRC)
Panel Bit Depth
10 (8+2)
Panel Frequency
Panel Frequency
Screen Resolution
4K Ultra HD
Smart Features
BBC iPlayer
Full Web Browser
Netflix 4K Streaming
Works with
Amazon Alexa, Google
Smartphone control
TV Catch Up
Freeview Play
Voice Activated TV
ARC - Audio Return Channel
Yes - eARC
Digital Audio Output
Yes - Optical
3 (HDCP 2.2 - 2)
HDMI 2.0
Headphone Socket
Analogue Tuner
TV Tuner
USB Recording
USB Video Playback
Energy Consumption
Energy Efficiency Rating
Power Consumption - Standby
Energy - kWh/1000h
Energy - HDR rating
Energy - HDR kWh/1000h
Energy - Label Rating
Dimensions excluding stand WxHxD
901 x 517 x 63
Dimensions including stand WxHxD
901 x 574 x 236
Maximum Stand Width (mm)
Outer Box Dimensions WxHxD
1010 x 661 x 149
VESA Fittings
200 x 200
Wall Mount Required
VESA - 200 x 200
Weight (KG)
11/13 (Without/With Stand)
Remote Control
Yes - Fixed
Rated 4 out of 5 by from Picture quality Picture not sharp, just woolly. Am still messing around with the set up a werk after purchase. Better than it started but nowhere near what I would have expected or hopef for on a 4K tv. I also have a Sony 4K tv which is just in a different league without having to change a thing.
Date published: 2022-03-01
Rated 5 out of 5 by from Excellent Picture and sound I bought this product 2 weeks ago. The service was excellent together with the extended warranty offer
Date published: 2022-02-28
Rated 5 out of 5 by from Panasonic 4K TV - Superb! - Say No More ! A Superb Panasonic 4K TV - Very Pleased - Highly recommended !!! & Richer Sounds price beat cheapest competitor's price :-)
Date published: 2022-02-28
Rated 5 out of 5 by from superb tv all bells and whistles in a 40inch TV bought this tv because it has all the tech that is only in larger tvs with other companies and it is proving to be an excellent choice
Date published: 2022-02-26
Rated 5 out of 5 by from Staff very helpful. I bought this only circa two weeks ago so am finding what this tv can do. I am enjoying it up to now. No
Date published: 2022-02-25
Rated 4 out of 5 by from Excellent quality- tricky stand Bought few weeks ago for our new home and set-up last week. The stand was the trickiest part and needed a fair bit of focusing (and some tools) to assemble. The actual set-up was easy enough. TV currently standing on the group but it’s too low so it’s be bought a low TV stand to set it up on. I recommend this TV for those who want to enjoy some screen time but not be sucked into a totally vegetative state with a monster size option!
Date published: 2022-02-20
Rated 4 out of 5 by from Mr John Excellent TV. Good picture (Easy configured if you want extra saturation etc}. Reasonable sound, so in a small room no need for a soundbar
Date published: 2022-02-19
Rated 5 out of 5 by from Fantastic TV Superb TV. Sound, picture & features are excellent. Very pleased!
Date published: 2022-02-19
Rated 5 out of 5 by from Just perfect customer service I recently purchased a Sony TV, which subsequently had to returned, I have nothing but praise for the team here, at Richer Sounds Lichfield, in accepting and recognizing, I had a problem and resolving it to my satisfaction, without hesitation, even allowing me to change from my original choice, back to a brand I've owned all my life Panasonic.
Date published: 2022-02-17
Rated 5 out of 5 by from picture superb ordered in January a long time coming but worth the wait
Date published: 2022-02-04
Rated 5 out of 5 by from So happy I've had the TV for a week or so. It was easy to set up, re. internet, apps and picture. The TV is thin and looks great. I appreciate that there is better technology for some larger screens but I don't want a room dominated by a TV - 40" is a good size and picture clarity is good. Richer Sounds offered a great guarantee and staff knowledge is excellent - my go to place. No regrets with this TV.
Date published: 2022-02-04
Rated 5 out of 5 by from lovely tv Bought this tv 3 weeks ago for my mother. She loves it. Its picture is so much better than her previous tv. Does exactly what she needs, (and a whole lot more).
Date published: 2022-02-04
Rated 5 out of 5 by from Brilliant, clear picture and good speakers This Panasonic TV is highly recommendable. It was easy to set up and has a brilliant, clear picture and good speakers
Date published: 2022-02-03
Rated 5 out of 5 by from WONDEFUL SERVICE We needed to update our TVs for the latest technology. A friend recommended Richer and we bought 4 new sets, which were very competitively priced. We live much closer to John Lewis .... but there never seems any partner to give advice - just brand reps who want to sell you their equipment !
Date published: 2022-01-29
Rated 5 out of 5 by from Just what was needed, good price & great service I have been trying to persuade my wife we should get a new TV but she didn't like the idea of anything larger than our old 37" samsung. Eventually I was able to show that this 40" was smaller physically. The alternative 43" TVs are cheaper & plentiful but larger. She is very pleased with the choice, good picture & sound & doesn't overwhelm the room. Excellent service from Richer Sounds as usual.
Date published: 2022-01-18
Rated 5 out of 5 by from Perfect Absolutely brilliant pictures in the future will definitely buy again from the same company
Date published: 2022-01-09
Rated 5 out of 5 by from Great Experience We have bought 2 TV's in the last 2 months and have been very satisfied with the TV's and especially the Service and help we got. So thank you
Date published: 2022-01-09
Rated 5 out of 5 by from Great TV I’m very pleased with the picture & sound quality.
Date published: 2022-01-04
Rated 5 out of 5 by from Fantastic distinct picture quality Bought just before Christmas, can’t believe the upgrade in quality compared to our last main tv.
Date published: 2021-12-31
Rated 5 out of 5 by from A star performer packed with features Purchased to use in a room with no arial nor satellite access. I’ve not been disappointed with the performance nor the features available, especially when I only have WiFi access in the location. The menu system is smooth and easy to navigate. The picture quality is spot on too, so what’s not to like. Would recommend.
Date published: 2021-12-30
Rated 5 out of 5 by from Great all around TV Bought it for 17 year old Son who mainly uses the TV for gaming. He was very happy with the quality of picture and how it enhanced his game playing enjoyment.. Had to 40" TV because of where he had to put it in his room, so perhaps could have spent less as 40" is not a popular size, but regardless, very happy with the overall quality. As always, staff at Richer Sounds very insightful and full of knowledge - a great help.
Date published: 2021-12-27
Rated 5 out of 5 by from Great sound and picture. Excellent product. It didn't come with an aerial lead which I wasn't made aware of (apparently no TV these days come with one). Apart from that the staff were excellent and very helpful.
Date published: 2021-12-23
Rated 5 out of 5 by from Great Customer service as always My Panasonic PANA-TX-40JX850B developed a pixel fault after only a short period (a vertical line of missing pixels down LHS of screen. Richer sounds swapped it no problem and the replacement one seems even better.
Date published: 2021-12-19
Rated 5 out of 5 by from Richer Sounds exceed all expectations Bought this in the Black Friday deal from a well known retailer, two weeks later still not arrived. Rang Richer sounds Watford, had it in stock, matched the price and I had it at home within an hour. TV as expected, decent sound excellent picture, easy to set up , useful features, cant fault it at present only been installed a week. This is where it is excellent. I then saw TV ADVERTISED at costco for £75 pounds less, rang Watford and z speculative call forca price match was honoured almost instantly by Lloyd. Saved myself so much money and got great service support and guidance. Thank Lloyd and thfcteam at Watford branch. Througholy recommend the people there. The TV is excellent quality, expensive for a 40" TV
Date published: 2021-12-15
Rated 5 out of 5 by from Great picture and sound I brought this with humax box, tv sivel bracket & tv wooden stand.
Date published: 2021-12-08
Rated 5 out of 5 by from Great picture sound quality nice size screen I brought it last month great TV without been to dominate in the room great features very happy
Date published: 2021-12-07
Rated 4 out of 5 by from Great service from Richer Sounds The customer service staff were fantastic, along with the delivery guys. I tried to change the delivery address but I couldn’t because I’d chosen to pay interest free instalments which was a shame. Luckily the TV was only going 2 doors down so not a problem.
Date published: 2021-12-07
Rated 5 out of 5 by from All the features we wanted as the old TV only had We needed a larger TV we wanted a 37inch but not available now so got this 40 inch and well pleased we did as it fits nicely and the picture is really good and the Netflix is what we wanted as well. thanks to the staff in RS who advised and we walked out the shop with it same day
Date published: 2021-12-05
Rated 5 out of 5 by from A high quality product. The product is very satisfying to use with impressive features that are easy to access. I am pleased that I bought the item and especially that I used Richer Sounds who provided good advice.
Date published: 2021-12-03
Rated 4 out of 5 by from Just the job. Very good picture and integral sound - no need for a sound bar. Product is smart and generally as described. Only slight minus point is that assembling & attaching the stand is physically tricky for one person on their own and diagrams make sense once you've done it but are not the easiest. I ended up using intuition first and just confirmed that I had done it right afterwards using the paperwork. The Richer Sounds staff were extremely helpful and efficient.
Date published: 2021-12-03
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