TV has Blue or Green Tint-Easy Solutions
By Robert Jones · 2022-04-21
Is your TV suddenly showing a dodgy blue or green tint? Don't fret, mate; it's a common problem and usually dead easy to sort without chucking out your gogglebox. I've seen it countless times, and I'll show you how to fix it.
Honestly, there's nothing quite like settling down after a long day, cuppa in hand, ready for a bit of telly. Maybe it's the footy, a decent film, or even just some rubbish reality show – we all need that bit of escape. But then, *bam*, the screen's gone all wonky. That familiar sight, or rather, *unfamiliar* sight, of everything bathed in a horrid blue or sickly green tint. It proper ruins the mood, doesn't it? I've been knocking about in this game for over two decades now, testing speakers, faffing with amps, and generally getting my hands dirty with home cinema kit. And believe you me, I've seen my fair share of TVs that have decided to throw a wobbly. A blue or green tint is right up there with the common complaints, and the good news is, it’s often a doddle to sort out without splashing loads of cash or chucking the whole thing out. Most of the time, it’s something straightforward, but occasionally, aye, it can be a bit more serious. We'll cover all bases here, starting with the easy stuff. **Quick Verdict: Don't fret, a blue or green TV screen often has a simple fix.** ### Who It's For: * Anyone whose TV has suddenly decided to change colour. * Folks who like to get stuck in and try a fix themselves before calling someone out. * Those wanting to save a few quid on potential repair bills. * Anyone who fancies understanding their home entertainment setup a bit better. * Readers who appreciate a bit of honest, no-nonsense advice. ### Who Should Skip It: * People who prefer to just replace things at the first sign of trouble. * If your TV's still under warranty, ring the manufacturer first – they're the first port of call. * Anyone uncomfortable fiddling with cables or going into settings menus. * If you're expecting a load of technical jargon and academic waffle – you won't find it here.  *A telly gone all blue in the SpeakersMag workshop. Not ideal for a proper Gogglebox session, is it?* ## The Usual Suspects: Where to Start Your Investigation Right, let's roll up our sleeves and get stuck into this. When your gogglebox decides to go all Smurf-blue or Hulk-green, the absolute first thing to do is take a deep breath. Panic achieves nothing, and usually just leads to more problems. We need to be methodical, like a detective, but instead of chasing villains, we're after a dodgy cable or a confused setting. Over my time, I've developed a bit of a routine for these things, and it usually sorts out the issue pretty quickly. ### 1. The Classic 'Off and On Again' Trick I know, I know, it sounds a bit daft, doesn't it? But honestly, you'd be gobsmacked how often a simple power cycle works wonders. Think about it: modern TVs aren't just dumb screens anymore; they're basically fancy computers. And just like any computer, they can get a bit overwhelmed or confused. A quick reboot can clear out all sorts of temporary glitches in the TV's software or firmware. Don't just press the button on the remote, though. That often just puts it into standby. You need to actually unplug the TV from the wall socket. Leave it for a good minute or two. This lets everything properly discharge and reset. Plug it back in, switch it on, and cross your fingers. Sometimes, that's all it takes. ### 2. Check All Your Connections: The Cable Caper This is a big one, perhaps the most common culprit. A loose or damaged cable can wreak absolute havoc with your picture quality. I've seen it countless times. Here's what you need to do: * **HDMI Cables:** These are your main suspects. They carry both video and audio. A slightly loose HDMI cable, or one that's been bent a bit too sharply, can mess with the colour information. Make sure it's properly seated in both the TV and the source device (Sky box, Blu-ray player, PlayStation, etc.). Unplug it, have a look at the pins – make sure none are bent – and then plug it back in firmly. Try swapping it with another HDMI cable you know is good, if you've got one lying around. Sometimes, it's just a cheap cable giving up the ghost. * **Other Cables:** If you're using older kit, you might have Scart cables or component video cables. The same rules apply. Check them all. Component video, in particular, uses three cables for video (red, green, blue). If one of these is loose or faulty, you'll definitely get a colour tint. Red missing? You get a green/blue picture. Green missing? A purple/red hue. You get the idea. * **The Aerial/Satellite Cable:** Less likely to cause a distinct blue or green tint across the *whole* screen, but a poor signal can sometimes lead to general picture degradation that might *look* like a colour issue. Still worth checking it's snug. My workshop's a jungle of cables, so I know how easy it is for them to get nudged. Give 'em all a good once over. ### 3. Source Device Issues: Is the Problem with the TV or What's Plugged Into It? This is a crucial diagnostic step. We need to figure out if the problem is with the TV itself or with whatever you're watching. * **Switch Inputs:** If you're watching Sky, switch to the built-in Freeview tuner (if your TV has one) or to a different HDMI input that has a DVD player or games console plugged in. If the blue/green tint *disappears* on the other input, then you know the problem isn't with the TV panel itself, but with the original source device or the cable connecting it. * **Try Different Devices:** If you've got a laptop, plug it into an HDMI port on your TV. Does the laptop's picture also have a blue/green tint? If not, then your TV is likely fine, and the issue lies with your set-top box, console, or whatever primary source you were using. * **Internal Apps:** Most smart TVs have built-in apps like Netflix or BBC iPlayer. Try watching something using one of these apps. If the picture is perfectly normal, then you've pretty much confirmed the TV is okay, and the problem is definitely with an external device or its connection. This step helps narrow down your search significantly. No point in fiddling with TV settings if the TV itself isn't the problem. ## Digging Deeper: Settings and Software If the simple checks haven't sorted it, it's time to delve into the TV's inner workings a bit. Don't be scared, the settings menus are usually pretty straightforward. ### 4. Picture Settings & Colour Calibration Modern TVs have a shedload of picture settings. It's easy for something to get knocked out of whack, especially if little Johnny's been playing with the remote. * **Reset Picture Settings:** Most TVs have an option to reset just the picture settings to their factory defaults. This is often in the 'Picture' or 'Display' menu. It's a good first step, as it'll undo any accidental tweaks that might be causing the tint. You'll likely find settings like 'Colour Temperature', 'Tint', or 'Hue'. If these are set incorrectly, particularly 'Tint' or 'Hue', they can introduce a strong colour cast. * **Check Colour Temperature:** This setting dictates how warm or cool the overall image looks. If it's set too far one way (e.g., a very cool setting), it can lean into a blueish tint. Try changing it to 'Warm1', 'Standard', or 'Neutral'. * **Dynamic Colour Modes:** Some TVs have 'Dynamic Colour' or 'Vivid' modes that boost colours. Occasionally, these can overcompensate and introduce a cast. Try switching to a 'Standard' or 'Cinema' mode. ### 5. TV Software Update As I said, TVs are essentially computers. And like computers, they need software updates. These updates often fix bugs, improve performance, and yes, sometimes even sort out display issues. * **Check for Updates:** Go into your TV's settings menu – usually under 'Support', 'About', or 'System'. There should be an option for 'Software Update' or 'Firmware Update'. If your TV is connected to the internet, it can often download and install these automatically. If not, you might need to download the update to a USB stick from the manufacturer's website and install it that way. Always follow the manufacturer's instructions carefully when doing a firmware update; you don't want to brick your TV. ### 6. HDMI Deep Colour / HDMI UHD Colour Settings This is a bit more advanced but worth checking, especially with 4K TVs and newer source devices. Some TVs and devices have settings for 'HDMI Deep Colour' or 'HDMI UHD Colour'. These enable wider colour gamuts and higher bit depths. If there's a mismatch or a fault in how these signals are being processed, it can sometimes lead to strange colour tints. * **Toggle the Setting:** Find this setting (it's often specific to each HDMI input) and try turning it off or on. See if it makes a difference. If you've recently introduced a new 4K device, this is a prime suspect. ## When It's a Bit More Serious: Hardware Problems If you've gone through all the steps above and your TV is still looking like it's been dunked in a vat of blue paint, then unfortunately, we might be looking at a hardware fault. This is where it gets a bit trickier, and depending on your comfort level and the TV's value, you might need to consider professional help. ### 7. Internal Component Failure This is the bad news, really. Various internal components can cause colour issues. * **T-Con Board (Timing Controller Board):** This board is responsible for processing the video signal and sending it to the display panel. A faulty T-Con board is a common cause of colour problems, including tints, washed-out colours, or even a completely blank screen. It's often a relatively inexpensive part, but replacing it does involve opening up the TV. If you're not confident with electronics, this is a job for a qualified repair technician. * **Main Board / Motherboard:** The main board handles all the TV's processing. If it's faulty, it can mess up any aspect of the TV's operation, including colour. Replacing a main board is usually more involved and costly than a T-Con board. * **Display Panel Itself:** The actual screen, the panel. This is the most expensive part of the TV. If the panel itself is failing, perhaps due to physical damage (even minor, unseen stress), or an internal component within the panel is shot, then you're likely looking at a new TV. Repairing or replacing a panel is almost always uneconomical unless it's a very high-end, large TV. ### 8. Backlight Issues (Less Common for Tints, but Possible) While backlight issues usually manifest as dark spots, flickering, or a generally dim picture, a faulty colour filter or an issue with the LED backlight array *could* potentially contribute to a colour cast. It's less likely to be the primary cause of a *strong* blue or green tint, but it's part of the overall display system. If you're seeing other backlight-related symptoms alongside the tint, it might be a factor. ## Practicalities and What Next? If you've diagnosed a hardware fault, you've got a few choices: ### DIY Repair vs. Professional Repair vs. Replacement * **DIY Repair:** If you're handy with a screwdriver, know your way around a multimeter, and are comfortable with YouTube tutorials, you *could* try replacing a T-Con board yourself. Parts are often available online. Just be very careful with static electricity and make sure the TV is unplugged and discharged before you open it up. *Safety first, always.* * **Professional Repair:** Get a few quotes from local TV repair shops. Be honest about the symptoms and what you've already tried. They might give you a rough estimate over the phone. For a T-Con board, it might be worth it, especially if it's a decent 50-inch plus TV. For a main board or panel, it's often not financially sensible. * **Replacement:** Sadly, sometimes it's just not worth the repair cost. If your TV is more than 5-7 years old, or it's a cheaper model, a new one often makes more sense. The picture quality and features on newer models are genuinely much better, and you'll get a fresh warranty. Keep an eye out for sales around Black Friday or the January clearances; you can often bag a proper bargain. ## A Note on Calibration and Professional Setup Once you get your TV back in working order, or if you get a new one, consider getting it properly calibrated. Now, I'm not saying you need a full professional ISF calibration for hundreds of quid for every telly, but even a basic setup using a test disc (like Spears & Munsil or Disney WOW) can make a world of difference. It optimises the brightness, contrast, colour, and sharpness for your specific viewing environment. It'll make sure those blues are *actually* blue and those greens are *actually* green, as they should be, not some weird tint. I've had TVs come through the workshop that look perfectly fine to the average punter, but with a bit of calibration, you can really make them sing. It's about getting the picture to look as the director intended, not some oversaturated, artificial mess. --- ## Comparison: Common TV Colour Issues & Potential Causes | Issue | Most Common Cause(s) | Likely Fix | DIY Friendly? | Cost (Estimate) | | :-------------------- | :----------------------------------------------------- | :------------------------------------------------------------------------ | :------------ | :------------------ | | **Blue/Green Tint** | Loose/Faulty HDMI cable, Incorrect Picture Settings, T-Con Board, Main Board | Check cables, Reset settings, T-Con/Main Board replacement | Yes (basic), No (boards)| £0 - £150+ | | Red/Purple Tint | Loose/Faulty HDMI/Component Cable (e.g., green channel missing), Incorrect Picture Settings | Check cables, Reset settings | Yes | £0 - £20 | | Washed Out Colours | Incorrect Picture Settings (Brightness/Contrast), T-Con Board, Backlight issues | Reset settings, T-Con board replacement | Yes (basic), No (board)| £0 - £100+ | | Specific Colour Patches | Panel Fault, Backlight Diffuser issues | Panel replacement (often uneconomical) | No | £300+ (often new TV) | | Flickering Colours | Faulty cable, T-Con Board, Main Board, Power Supply | Check cables, Board replacement, Power supply repair | Yes (cables), No (boards)| £0 - £200+ | | No Colour (B&W) | Picture Mode set to Monochrome, HDMI Colour Space, Old Analogue Signal | Check Picture Mode, HDMI Settings (RGB/YCbCr), Source device | Yes | £0 | *Note: Costs are rough estimates for parts/labour and can vary wildly depending on TV model and repairer.* ## FAQ Section ### Q: My TV has a blue tint only on one input. What does that mean? A: That's a good sign! It strongly suggests the problem is with the device connected to that specific input (e.g., your Sky box or games console) or the cable connecting it, rather than the TV itself. Focus your troubleshooting efforts there: swap the cable, check the device's output settings, and try a different source device on that same input to confirm the TV port is working. ### Q: Can a power surge cause a TV to have a colour tint? A: Absolutely, yes. A power surge can damage internal components, including the main board or T-Con board, which are critical for proper colour processing. If you experienced a power cut or surge just before the tint appeared, it's a very strong indicator of internal damage. You might need a professional repair or, depending on the TV's age, a replacement. ### Q: Is it safe to open up my TV to check internal components myself? A: Only if you're competent with electronics and understand the risks. TVs contain high-voltage capacitors that can hold a dangerous charge even when unplugged. Always unplug the TV for at least 10-15 minutes before opening it, use anti-static precautions, and know what you're doing. For most people, it's safer to call a professional technician if it comes to internal hardware. ### Q: My new 4K TV has a slight green tint. What could be wrong? A: With newer 4K TVs, especially if it's a slight tint, check the HDMI cable first – make sure it's a certified high-speed HDMI cable, as cheap ones can struggle with the bandwidth needed for 4K. Then, look at the 'HDMI Deep Colour' or 'HDMI UHD Colour' settings on both the TV and your source device. A mismatch or a buggy implementation of these advanced colour settings can sometimes cause subtle tints. Also, ensure your TV's picture mode isn't set to something overly vivid or incorrect. ### Q: My old CRT TV suddenly has a green blob in the corner. Is this the same problem? A: Not quite the same, mate. On old CRT (cathode ray tube) TVs, a coloured blob or patch is often caused by magnetisation of the screen or shadow mask. This can happen if a strong magnet is brought too close to the TV, or if the TV's degaussing circuit (which demagnetises the screen on startup) fails. Sometimes, simply turning the TV off and leaving it for a while, then turning it back on, can trigger the degaussing and clear it. If not, it's a more specific repair unique to CRTs. ## Final Word So there you have it, a proper deep dive into why your telly might have gone all blue or green. More often than not, it's a simple fix: a loose cable, a quick power cycle, or a tweak in the settings. These are the bits you can definitely tackle yourself and save a few bob. Always start with the easy stuff, rule out the obvious, and work your way down the list. If you find yourself staring at a hardware fault, well, that's a tougher pill to swallow. It then becomes a question of economics – is it worth fixing an older set, or is it time for an upgrade? Modern TVs offer fantastic picture quality for the money these days, so don't rule out a shiny new gogglebox if the repair bill looks too hefty. Whatever you do, don't put up with a dodgy tint; life's too short for watching a blue version of your favourite show. Get it sorted, and enjoy your viewing as it should be!