Toshiba Amazon Fire 4K HDR LCD TV Review (43LF621U19, 50LF621U19, 55LF621U19)
Stephan Jukic – January 20, 2019
Amazon’s Fire 4K TVs are not made by Amazon itself. Instead, three different brands (so far) have opted to use Amazon branding and Amazon’s excellent smart TV platform (along with its Alexa remote control) in their own 4K UHD TVs and label these models as “Amazon Fire” 4K TVs. It’s a workable relationship and what you get when you buy any one of the models currently in existence is a very basic 4K UHD TV in terms of display performance but with a superbly good smart TV platform and remote control features that are premium-good. The Toshiba Amazon Fire 4K UHD TV of 2018 (and into early 2019) is the best of the three existing Amazon Fire 4K UHF TVs, with others from Insignia and Element being priced almost the same but with slightly weaker display performance specs.
This 4K HDR TV is basic and it won’t wow anyone with its picture vibrancy, but its 4K resolution is as good as it gets in any other 4K TV and the Amazon accessories built into the Toshiba Fire TV are genuinely an excellent deal for this model’s nearly rock bottom budget price. For this reason, we thought it was worth reviewing and worth praising in certain ways.
• Strong, uniform black levels for HDR and SDR content
• Very good contrast ratio overall
• Reasonably bright display
• Amazon Fire smart TV platform is great
• Amazon Alexa remote is excellent
• Wonderfully cheap price
• The HDR specs are barely worth mentioning
• Color performance is only modestly decent
• Motion handling is weak
• Few connectivity ports
• Overall picture quality never impresses on anything except basic resolution (native 4k)
There’s no whitewashing that the Toshiba Amazon Fire 4K HDR TV is far from an ultra-premium 4K HDR TV in how well it performs. But that’s not what anyone sane would expect from this 4K TV and it’s also not what it offers for its extremely low price by 4K TV standards. Instead, the Toshiba Fire basically offers a great, fleshed out starter 4K TV package that delivers the essentials of decent picture quality, some HDR display capacity (though not much) and couples these with an exceptionally good smart TV platform & remote control combo. In these regards, the Fire TV is wonderful because while it doesn’t offer any Wow Factor or hardcore premium display, it also doesn’t promise these things or cost the much larger amounts that they usually sell for in 4K TVs. As a second bedroom TV, or as a 4K TV for people who want some modern quality and great smart TV on a very tight budget, we really recommend the Toshiba Fire 4K TV. You almost can’t get cheaper than this.
What We Liked
Despite a lack of extraordinary display specs and features, the Toshiba Fire 4K TV comes with lots of very decent qualities and in at least a few specific things, it simply excels in surprising ways. The following are the things we thought were absolutely best about this model.
Amazon Fire Smart Platform & Accessories
The single biggest selling feature of the Amazon Fire TV lineup, including the Toshiba edition being reviewed here along with all the other editions from other brands, is the Amazon Fire TV smart platform and its accessories. This is obvious since these are all called Amazon Fire TVs regardless of their specific manufacturer brand names and it’s the case for a good reason: Amazon Fire is excellent. The smart interface gives you a very intuitive user interface that’s easy to get used to. Furthermore, it integrates wonderfully with Amazon’s Alexa voice control features, which are extremely responsive, usually very good at understanding human speech, and which come include with this television’s smart remote control.
We should also note that the selection of available apps inside the Amazon smart platform is great, with thousands of media source options containing tens of thousands of hours of content. One downside to the Amazon smart platform is that it also comes with ads and Amazon will frequently push its own app or video selections at you and strangely, when you consider that this is an Amazon-branded HDR TV, Amazon Prime isn’t available with HDR content, but these are minor tradeoffs.
Overall Picture Performance
The overall picture quality of the Toshiba Fire 4K TV is not stellar, but neither is it terrible. For example, this 4K TV performs almost identically to Samsung’s NU7100 while costing a decent amount less. Furthermore, the Toshiba Fire is a much better performer at key display specs than any of LG’s low-priced 2018 LCD 4K TVs and it’s cheaper than most of them too. Thus, you-re getting plenty of decent quality in this model even if few of the specific display specs are excellent. The 4K resolution looks as fantastic as it ever does for any native ultra HD content you watch on the Toshiba Fire, and this TV’s upscaling engine is great at making 1080p and 720p content look much better than it normally would. Furthermore, while the Toshiba Fire lacks really robust HDR chops, it does deliver some very decent color reproduction partly due to its 10-bit color capability and spices this up even further by being genuinely strong at black level uniformity and at contrast.
Black Levels and Contrast
The single strongest performance characteristics of the Toshiba Amazon Fire 4K TV is how well it delivers its black levels and uniformity and how well it renders contrast All of these are crucial aspects of ultra HD TV performance and they definitely play a major part in how well high dynamic range of any kind can be shown off. In this television, they-re simply great. Black uniformity is surprisingly strong and black levels are very deep on the Toshiba’s VA panel TV screen. Additionally, the contrast ratio that this highly affordable 4K UHD TV delivers is nothing less than excellent, being roughly comparable to those we’ve seen in much pricier 4K HDR TVs like Samsung’s QLEDs and other premium 4K TVs. Yes, it may apply only to the contrast but it really is that good.
As a result of these particular specs being so great, the Toshiba Fire TV makes some of its weaker display specs work better than they might normally pull off. The color vibrancy it outputs is augmented by the strong black levels and with 10-bit color thrown in for HDR content, the result is just enough quality to be pleasing even if it’s not breathtaking.
Motion Blur Control
This particular 4K TV doesn’t handle motion exceptionally well in a universal sense but one thing it does manage to do very well is deliver very strong motion blur control due to its remarkably strong response time for shifts in pixel color. In other words, even as content shifts rapidly across the screen or luminosity changes frequently, the Toshiba Fire 4K HDR TV makes its pixels keep up smoothly with what’s going on for a smooth, mostly blur-free level of picture performance.
What We Didn’t Like
Now, while the Toshiba Fire 4K HDR TV delivers some surprisingly good results in certain key aspects of picture performance, it still is an extremely budget-geared 4K UHD TV and there’s plenty to dislike about its overall performance too. Yes, since we’re talking about a truly rock bottom budget ultra HD TV here, you can’t expect too much from it but several things are worth mentioning nonetheless.
On display brightness, Toshiba’s Fire 4K HDR TV is mediocre. It doesn’t underperform many other budget 4K HDR TVs but it also certainly doesn’t exceed any models we can think of from the 2018 releases. The SDR brightness on this TV (display luminosity for playback of ordinary content from non-high dynamic range sources like broadcast TV, streaming HD media or DVDs and so forth) is pretty decent and comparable to what we’ve seen in 4K TVs like the Samsung NU7100 or the TCL S-Series models. In other words it’s not bad. However, when it comes to playing back HDR video sources, the LF621U19 Toshiba Fire TV really underperforms. Display luminosity of both the sustained and peak kind for any area of the screen underperforms this TVs SDR content brightness almost across the board and that’s just a bit peculiar, and disappointing.
Because of these issues, the LF621U19 isn’t a particularly great television choice for use in brightly lit spaces and when it comes to HDR movie playback from sources like Netflix, it pretty much fails at the job when it comes to highlighting HDR content luminosity. Oddly though, the contrast ratio isn’t much affected by the Toshiba Fire TV’s screen brightness woes, simply because its excellent black levels do a lot to save the situation here.
Not much to say here except that in terms of connectivity options, the Toshiba Fire 4K HDR TV covers the basics but only basically. It’s main connectivity problems are that it has quite a few less inputs than is the average even among budget 4K UHD TVs, with only 3 HDMI ports and one solitary USB port (of the 2.0 kind). None of these are major problems but they might get problematic if you want to connect more than a few external media devices to your Toshiba Fire TV, especially if we’re talking about USB-connected hardware.
Related to the connectivity input scarcity we see in the Toshiba Fire 4K HDR TV is the fact that this television lacks any sort of high quality gaming responsiveness by 2018/2019 standards. Its input lag for console gaming in 4K, HDR, 1080p resolution and variations of these with different color formats and frame rates is for the most part not bad, hovering between 30 and 40 milliseconds in most cases, but it’s not even close to great either. Casual gamers probably won’t notice any problems with any of the input lag metrics of the Toshiba Fire Amazon TV but when we consider that even the cheapest 4K HDR TVs by rivals like TCL and Samsung all deliver fantastic responsiveness at 20 milliseconds or less in multiple resolution, frame rate and color modes, the Toshiba Fire TV starts to look a bit bad. Being a cheap budget TV doesn’t excuse mediocre gaming responsiveness. We should also note that the Toshiba Fire 4K TV delivers flat out terrible input lag if motion interpolation is activated and bad input lag if game mode is switched off. It also doesn’t support the following formats:
4k @ 120 Hz
4k with Variable Refresh Rate
1080p with Variable Refresh Rate
The motion blur control of the LF621U19 Toshiba Fire TV is great, surprisingly so, as we mentioned above but in most other properties of motion handling, this particular 4K TV doesn’t-t perform especially well. Most users of the TV won’t even really notice these sorts of deficiencies because the motion blur handling for most ordinary content from TV or streaming sources is good but motion interpolation for slower frame rate content in the LF621U19 is barely decent and this television has no support for judder-free playback of 24p content from streaming media, discs or any other source at all. Judder doesn’t bother many TV viewers but some people are sensitive to it.
High Dynamic Range Weakness
To summarize the main weaknesses of the LF621U19 4K HDR Toshiba Fire TV we can say that its supposed HDR component is damn weak. This isn’t a huge problem, because it can still play back all sources of HDR content and works mostly fine for the non-HDR content that’s still the vast majority of what we see on our TVs today but, if HDR capability is what you want for some of your favorite Netflix movies or 4K HDR Blu-ray discs, the LF621U19 will disappoint you. Its supposed HDR specs are helped only by this model’s capacity for 10-bit color rendering. In almost everything else, the LF621U19 just doesn’t deliver notable dynamic range results.
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Value for Price & Bottom Line
All things considered, we really do like the LF621U19 Toshiba Amazon Fire 4K HDR TV. Its HDR might suck and many of its specs are only decent (with some simply being mediocre by 4K HDR TV standards) but on the whole, this Toshiba Fire TV model delivers great value for the money it will cost you. It’s genuinely a decent TV with some great 4K resolution, good general color performance and great black levels and contrast. These more than compensate for its defects as a starter ultra HD TV, especially at the wonderfully low prices it sells for in its three sizes.
Key Samsung The Frame Specs
• Screen sizes: 43 Inch 43LF621U19, 50 inch 50LF621U19, 55 inch 43LF621U19 (TV being reviewed is 50 inches)
• Smart TV: Amazon Fire TV smart platform 2018
• HEVC (H.265) Included: Yes
• VP9 Included. Yes
• HD to UHD upscaling: Yes
• HDCP 2.2 Compliance: Yes
• HDR Support: Yes, HDR10,
• Refresh Rate: 60Hz native refresh rate
• Screen Lighting: LCD Display with edge-lit LED backlighting
• Resolution: 3,840 x 2,160 pixels UHD
• Wireless Connectivity: Yes, includes both built-in WiFi and Ethernet port
• Remotes: Amazon Alexa smart remote, voice control, remote app for iOS and Android
• Connectivity: 3 HDMI (all of them 2.0a and HDCP 2.2) ports, 1 USB ports, 1 Ethernet port, 1 Digital Audio Out,
• Contrast Ratio: 5050+:1 (native, real contrast)
• Maximum Peak Brightness: 351 nits (cd/m2)
• 3D Technology: N/A
Display Performance Metrics
Now we’re going to cover the most important and performance-relevant in the Toshiba Fire LF621U19 4K HDR LCD TV. They all revolve around color reproduction, brightness, black levels, contrast, local dimming and motion handling. These specs may vary slightly from unit to unit so they should not be taken as absolutes in their specific numbers as recorded here. However, they should maintain a generally high level of similarity in all units, making them good enough to be reliable indicators of quality.
The specs and metrics we’re going to cover here are basically what really decides if a 4K TV is worth buying or not. They’re its most important indicators of real performance and they disregard all the marketing and labeling fluff that manufacturers like to slather their TVs in for the sake of making them seem more exceptional than they really might be. Here we ignore fake color brilliance labels and disingenuous terminology like a TVs “Motion Rate” (which mainly just describes a completely invented motion refresh rate that has nothing to do with what the TV panel can actually do) and other such jargon.
One thing that’s worth noting for buyers of this or any other 4K UHD LCD TV is that different sizes in TV displays can change some of these metrics slightly (for example, larger edge-lit LCD 4K TVs tend to have weaker local dimming and peak brightness). As an edge-lit LCD TV, the Toshiba Fire can have some slight variations to how its backlight affects local dimming, contrast and black uniformity depending on the size of screen being considered. These sorts of variations don’t apply so much to OLED UHD TVs or to full-array LCD TV models.
Black Level, Contrast and Local Dimming:
These crucial display specs in any 4K TV are all closely related to each other as far as display performance goes. Thus they deserve to be covered together.
The Toshiba Fire TV delivers some of its strongest qualities in this broad category of crucial display specs. They are what make many of the TV’s other much weaker specs look much better as a result. Specifically, the black levels and black uniformity of the LF621U19 are excellent or at least very good. We’ve seen better in other almost equally affordable ultra HD TVs but for its incredibly low price, the Toshiba Fire is really great at creating deep, strong black levels that are remarkably uniform throughout. In other words, the amount of light bleed leading to display clouding during very dark scenes is quite low and the actual black level sits very high with a luminosity during deep blacks that’s only slightly above 0.023 nits. Additionally, the TV comes with excellent contrast that sits comfortably above or around 5030:1. We’ve seen better from a number of other low-cost 4K HDR TVs such as the TCL 6-Series and Samsung’s NU7100 but again, over 5000:1 is great by any measure and particularly so in such an affordable 4K UHD TV as the Toshiba Fire LF621U19. What’s notable here is that (as we’ll cover just a bit further down) the LF621U19 isn’t a particularly bright 4K HDR TV but still manages to get saved by its great contrast.
Where the Toshiba Fire does fall completely flat is on local dimming, simply because it doesn’t have any, but then again this is to be expected because this particular feature is completely absent in most budget televisions (with TCL’s superb 6-Series models being one of the very few notable exceptions). That said, despite the lack of local dimming, this Fire TV still manages a robustly good black uniformity and only modest levels of halo effect around brightly lit objects against dark backgrounds in onscreen content. So we can’t complain too much about its lack of local dimming. It’s simply worth mentioning that there isn’t any.
Peak brightness is the maximum possible spot HDR or SDR luminosity of a complete 4K TV display or differently sized sections of its screen as measured in units of brightness called nits (or cd/m2, which is the same thing). Sustained brightness is the highest possible sustained HDR or SDR brightness that the TV screen can manage across its entire screen or parts of it for a prolonged period of time (a few minutes or more). In other words, Peak brightness consists of how luminous sudden bright spots can become and sustained brightness measures prolonged luminosity in content on the display.
The Toshiba Fire is one unsurprisingly weak performer when it comes to peak brightness and to sustained display luminosity under almost all conditions. This particular 4K TV delivers decently strong brightness during playback of SDR video sources (all content that doesn’t have HDR integrated into it) but when it comes to HDR video playback if the Toshiba Fire is set to HDR mode, it’s mediocre at best. This is a bit odd since we’d expect the Fire LF621U19 to if anything do even better at screen brightness when it comes to HDR video playback but no, it’s the SDR that’s decent and the HDR that’s actually worse to the point of being useless. That said, even its sustained and peak brightness specs during playback of SDR aren’t anywhere close to exceptionally good, though they’re at least okay. The Toshiba Fire performs decently enough if you watch it in a dimly lit room or without the screen being exposed to direct external light. Overall, this Amazon Fire 4K TV model performs about as well as the similar Samsung NU7100 though the Fire TV is the cheaper model of the two.
On the other hand, what this Fire TV from Toshiba does do remarkably well is offer extremely uniform brightness levels for all screen testing metrics. That’s quite a rare thing in any 4K TV. What we mean by this will be demonstrated just a bit further down.
We’d also like to mention that color volume quality in the Toshiba Fire LF621U19 4K TV is pretty weak during playback of dimly lit scenes or overly bright scenes in content. So despite even its low peak brightness, this television doesn’t do a great job of preserving content color vibrancy at the extremes it can reach of luminosity and shadow.
The display brightness numbers below as measured in nits for different areas of display space, under both HDR and SDR settings and under both peak and sustained conditions demonstrate the Toshiba Fire’s overall capacity for screen luminosity. As you’ll note by looking at the figures below, the Toshiba Fire LF621U19 is surprisingly and remarkably good at staying very, very uniform in the levels of brightness it keeps across all testing parameters. It’s maximum display brightness in either HDR or SDR may not be incredible but it’s at least uncommonly even at all times:
Toshiba Fire LF621U19 SDR Brightness
- Overall SDR peak brightness for normal content: 355 nits
- Peak 2% display area display SDR brightness: 356 nits
- Peak 10% display area SDR brightness: 358 nits
- Peak 100% display area SDR brightness: 355 nits
- Sustained 10% SDR brightness: 352 nits
- Sustained 100% SDR brightness: 348 nits
Samsung FRAME HDR Brightness
- Overall HDR peak brightness for normal content: 362 nits
- Peak 2% display area display HDR brightness: 361 nits
- Peak 10% display area HDR brightness: 349 nits
- Peak 100% display area HDR brightness: 349 nits
- Sustained 10% HDR brightness: 350 nits
- Sustained 100% HDR brightness: 347 nits
First of all, Toshiba Fire offers at least some modest HDR color delivery: full support for 10-bit color with very little banding of colors during reproduction of content with 1.07 billion RGB color values. This is good and it makes the color grading during playback of HDR content look very nice on the LF621U19’s screen. On the other hand, the Toshiba LF621U19 has no wide color gamut (WCG) color space coverage, which is even more important for true delivery of high dynamic range color in the right kind of content. The Amazon Fire TV only covers a modest 80.02% of the DCI-P3 color space, and WCG color requires at least 91% coverage. The difference is large.
That said, for an absolute budget starter TV, the Toshiba Fire doesn’t perform badly at all. It will give you some minimal HDR vibrancy in HDR video sources and for ordinary content, HDR specs for WCG and 10-bit color are irrelevant anyhow, so for the vast majority of movies, TV shows and non-4K streaming content along with most non-HDR video content, the general color capabilities of this Fire TV are fine. Its bigger weakness is its lack of high display brightness, not so much its color performance.
Color volume maintenance is also however very poor in Toshiba Fire (as we mentioned above in our brightness section) and it’s definitely not a strong television when it comes to playing back color with good volume and vibrancy during shadowy scenes in content or during very bright content scenes (despite how low its peak brightness is anyhow).
White balance delta E and color delta E in Toshiba Fire sit at terrible out-of-the-box levels of 10.5 and 5.75 respectively and only this TV’s Gamma is decent right when the TV is turned on for the first time. Gamma out-of-the-box sits ate 2.3. In other words, all three and particularly the first two need immediate calibration. After some moderate picture settings calibration on the other hand, on the other hand, these same levels become much better even if they remain only decent, sitting at 3.6, 4.3 and 2.7 respectively for the model we reviewed. These details can however be improved away a bit more with the right amounts of fiddling with the Toshiba LF621U19’s picture settings. The bottom line however is that this TV simply will not deliver premium color quality no matter how much it’s played with.
Motion Handling & Upscaling:
Toshiba Fire offers mostly mediocre motion handling performance across the board except for its motion blur control is exceptionally good due to the TVs response time being set at 6.2 milliseconds. Toshiba Fire also has some decent enough motion interpolation capacity in its screen but this can produce a slight soap opera effect when used for movies that play at different frame rates. It’s also limited to 60Hz since that’s this television’s native refresh rate. It’s also worth noting that for the Toshiba Fire 4K TV, motion interpolation can be made to work at its most efficient by setting Motion Processing to standard or smooth, which will make the algorithm more conservative, and although motion isn’t as smooth, there are also less artifacts than what you’d get when Motion Processing is set to its max in this model. The 43 and 50 inch editions of the Toshiba Fire LF621U19 however don’t even come with this model’s fairly weak motion handling feature.
The Toshiba Fire TV also lacks support for judder-free 24p content playback from any source. It will of course play such content (usually 4K or HD Blu-rays and many DVDs as well as a large number of streaming media movies) but some judder is created and this might bother some people who are sensitive to this kind of thing.
As for Toshiba Fire’s upscaling, it works well at sharpening almost any reasonably well formatted source of content. It however operates at its best when being applied 1080p HD video and 720p programming of any kind. The native 4K resolution of the Toshiba Fire Amazon TV is great, and fully fleshed out without pixel-filling trickery like white sub-pixels.
Input Performance for Gaming and PC:
Most of the budget 2018 4K HDR TV lineup, from cheapest to priciest models, from most major TV manufacturers pretty much offers excellent responsiveness for console gaming and PC use at different resolution, color and HDR settings as well as at different refresh rates. For this very reason, it’s surprising that the Toshiba Fire 4K TV does not. It’s responsiveness for console gaming is at best decent and in many ways even mediocre, and the TV is less than stellar as a 4K PC monitor as well. Most of all though it’s the input lag it manages for console gaming that’s weak. Even in Game Mode it falls well short of the average for most budget or premium 4K TVs, which among all of the 2018 models hovered around 20 milliseconds. In the Toshiba LF621U19, the average input lag is closer to 40 ms, as the numbers further below bear out.
The following are the specific specs for this Fire TV’s gaming performance in different console setups:
- 4k @ 60Hz: 36.4 ms
- 1080p @ 60Hz: 34.1 ms
- 1080p @ 120Hz: N/A
- 4k @ 60Hz + HDR: 32.1 ms
- 1080p @ 60Hz + HDR: 54.1 ms
- 4k @ 60Hz Outside Game Mode : 72 ms
- 4k @ 60Hz @ 4:4:4: 35.4 ms
- 4K @ 60Hz @ 4:4:4 + 8 bit HDR: 37.4 ms
- 4K with interpolation activated: 137.4 ms
The Toshiba Fire is also moderately decent for use as a PC monitor if you want to do HD or 4K gaming on it, but it’s not extremely versatile. It’s compatible with multiple resolution and color formats and offers smooth frame rate handling between PC GPUs and what the screen delivers natively (60Hz). But other key PC connectivity options are sort of missing with this 4K TV, though the important ones are present. This TV offers up the following specific specs:
• 1080p @ 60Hz @ 4:4:4
• 1440p @ 60Hz
• 4k @ 60Hz
• 4k @ 60Hz @ 4:4:4
What it doesn’t support is the following:
• 1080p @ 120Hz
• 4k @ 30Hz @ 4:4:4
• 4k @ 120Hz
The Toshiba Fire comes with all of its connectivity ports built into the back of the TV to one side. There is no additional special cable management in this model like you can find in certain premium ultra HD TVs. You simply plug your cables right into the ports on the model. These consist of the essentials but with certain key differences from some alternative ultra HD TV models –mainly that the Toshiba Fire only has 3 HDMI ports and just one single USB port. But, this also means that the Toshiba Fire edition does comes equipped with three HDMI, USB connectivity and other crucial connectivity slots that a modern 4K TV needs. Toshiba also gave the Toshiba Fire full HDMI 2.0 HDR and HDCP supported bandwidth in all three HDMI ports. This is a nice touch considering that similarly priced rival TVs from Sony only offer this through two of their HDMI ports.
On a slight negative side, the Toshiba Fire TV only supports HDR10 passthrough. There is no support for Dolby Vision or even for HLG HDR content. It will play back movies mastered in both but without these HDR specs being rendered, though it hardly matters anyhow since this 4K TV only offers limited HDR visuals no matter what it plays.
The following are Toshiba Fire’s ports and their specifications:
- HDMI : 3 (all with HDCP 2.2 and full HDMI 2.0a capacity)
- USB : 1 (USB 2.0)
- Digital Optical Audio Out : 1
- Analog Audio Out 3.5 mm : 1
- Tuner (Cable/Ant) : 1
- Ethernet : 1
- IR In : 1
- HDR10 support: Yes
- Hybrid Log Gamma HDR support: No
- Dolby Vision HDR: No
The Toshiba Fire 4K TV models also offer audio connectivity in the following types.
- 1 Passthrough ARC Dolby Digital
- 1 Passthrough Optical Dolby Digital
Toshiba has released Toshiba Fire in several different sizes, for all sorts of budgets. Thus, a 43 inch model is being sold as well as editions in 55 inches and 65 inch ranges. These several Fire television editions sell for the following prices, found in the links below at the time of this writing. Bear in mind that these are subject to sometimes frequent downward change and it’s a good idea to click the following Amazon links for real-time pricing and all available discounts on this model.