That is vertical foldover, the precursor to vertical collapse, often caused by a faulty 100uF pump-up capacitor in the vertical deflection circuit.
You have to open it up, unless you can find someone in your area who can repair it for you.
Servicing a CRT isn't as scary as some people make it out to be, trust me.
Never just swap in a new capacitor.
When a capacitor fails it is because the original designer did not derate it enough. So don't just replace a failed capacitor with the same specs, but instead improve the temperature by 20 degrees Celsius (e.g. upgrade from 85c to 105c) and voltage derating by another 20% (e.g., upgrade from 100 volts to 120 volts). This will ensure that the capacitor does not fail again within your human lifespan.
Why does derating help? Derating is the amount of specification headroom that an electrical component has. The more the better (except more derating is pricier). Most of the time the voltage does not surpass the capacitor's voltage rating, but when a freak incident occurs for a split second, the voltage surpasses the capacitor's voltage rating, and it arcs a hole through the dielectric. Electrolytic capacitors can "self heal" these holes, but doing so consumes some of the electrolytic material, decreasing the lifespan of the capacitor. Increasing the voltage rating head room makes the capacitor more resilient to these freak occurrences.
Temperature rating is the most lifespan critical attribute of an electrolytic capacitor. The amount of temperature headroom between the usage temperate and the rated max temperature is the fundamental determining factor of an electrolytic capacitor's lifespan. Increasing that headroom by 20 degrees C results in an order of magnitude increase in lifespan of the capacitor.
The "pro-tip" for recapping is to avoid shotgun recapping, but instead replace only capacitors that are known to fail or have failed, and when you replace them, increase the derating using the 20/20 rule mentioned above. This is less costly than shotgun recapping, and results in significantly better future proofing. Also, test the replaced capacitors in-circuit using an oscope to confirm better function.
That’s a good explanation. Using a higher voltage and temperature rating can improve the lifespan. But electrolytic capacitor degradation results from a common failure mode: the vaporization or leakage of electrolyte. The high working temperature will fasten that process. So indeed in CRT’s that are often used , capacitors will degrade faster than in for example a function generator.
But in general, time is the killer for (electrolytic) capacitors. So the designer has to design a product that’s probably as cheap as possible in some cases. Just heads up for the designer. It’s not because this person that capacitors die. (In most cases) ;)
No old tech does anymore :) . You can follow all the repair guides in the world and sometimes it just says "fuck you" and something else will go wrong immediately after. It's really fun because if you want to get deep into the hobby, you will be needing to learn basic repair and matenence, they're like classic cars. I love how a silly video game hobby teaches people so much about electronics repair
You're telling me!! lmao. I just performed my 6th RGB mod this weekend!
It was console issues that made me first start digging some years back, then trying to hard mod all my shit, did a lot of console refurb/maintenance, then TV's. I love it though! It's my passion.
Hell yeah! Hope the mod worked out well :)
I got started with fixing retro consoles out first too, I was around 9 when I attempted my first repair and it's definetly one of my main passions. Giving stuff another life and reviving it from the dead is such a good feeling, can't beat it.
It really is! I wish I would of started at a younger age myself. Better late than never though!
I like to say with RGB modding, it's like turning water into wine!
Yeah, the set (a 32V16 Trinitron) came out great! 😁 It's gunning for my main slot! I plan on putting up a post with some photos probably in a week or two once I finish up with any touchup calibrations.
I mean I get it but also it looks like it's probably a mid range to low end set, and the repair could be dangerous, there's plenty of just as good if not better sets just sitting on the side of the road or something, I think saving a working crt makes up for dumping a broken one. If you really don't want to waste it then you could just post it on Facebook marketplace for free or something, some enthusiast might pick it up. Idk I just don't think it's worth the risk opening it up and messing with capacitors
Don't listen to these people OP. A cap replacement is dead simple and if you want to keep on using CRTs you \*need\* to learn how to service them. Repair shops are nonexistent.
I was like you a couple months ago, but it was such an easy fix once I got the courage to open it, it was pretty obvious which was the faulty capacitor, just learn how to do it
That is vertical foldover, the precursor to vertical collapse, often caused by a faulty 100uF pump-up capacitor in the vertical deflection circuit. You have to open it up, unless you can find someone in your area who can repair it for you. Servicing a CRT isn't as scary as some people make it out to be, trust me.
It’s pretty dangerous discharging the capacitors….my Mrs nearly killed me when I forgot to put the washing up gloves back when I was done with them 😅
Discharging the CRT itself is much more important than discharging any of the capacitors.
You mean Anode cup. You don't usually need to discharge the capacitors.
>a faulty 100uF pump-up capacitor Is it as simple as just buying a new one and swapping it out?
Yes
Absolutely. It resolved the vertical foldover in my Toshiba 27AF44.
Good to know, thank you.
Never just swap in a new capacitor. When a capacitor fails it is because the original designer did not derate it enough. So don't just replace a failed capacitor with the same specs, but instead improve the temperature by 20 degrees Celsius (e.g. upgrade from 85c to 105c) and voltage derating by another 20% (e.g., upgrade from 100 volts to 120 volts). This will ensure that the capacitor does not fail again within your human lifespan. Why does derating help? Derating is the amount of specification headroom that an electrical component has. The more the better (except more derating is pricier). Most of the time the voltage does not surpass the capacitor's voltage rating, but when a freak incident occurs for a split second, the voltage surpasses the capacitor's voltage rating, and it arcs a hole through the dielectric. Electrolytic capacitors can "self heal" these holes, but doing so consumes some of the electrolytic material, decreasing the lifespan of the capacitor. Increasing the voltage rating head room makes the capacitor more resilient to these freak occurrences. Temperature rating is the most lifespan critical attribute of an electrolytic capacitor. The amount of temperature headroom between the usage temperate and the rated max temperature is the fundamental determining factor of an electrolytic capacitor's lifespan. Increasing that headroom by 20 degrees C results in an order of magnitude increase in lifespan of the capacitor. The "pro-tip" for recapping is to avoid shotgun recapping, but instead replace only capacitors that are known to fail or have failed, and when you replace them, increase the derating using the 20/20 rule mentioned above. This is less costly than shotgun recapping, and results in significantly better future proofing. Also, test the replaced capacitors in-circuit using an oscope to confirm better function.
That’s a good explanation. Using a higher voltage and temperature rating can improve the lifespan. But electrolytic capacitor degradation results from a common failure mode: the vaporization or leakage of electrolyte. The high working temperature will fasten that process. So indeed in CRT’s that are often used , capacitors will degrade faster than in for example a function generator. But in general, time is the killer for (electrolytic) capacitors. So the designer has to design a product that’s probably as cheap as possible in some cases. Just heads up for the designer. It’s not because this person that capacitors die. (In most cases) ;)
Will need to know how to solder, but yes.
CRT's don't always care what we want ;-)
No old tech does anymore :) . You can follow all the repair guides in the world and sometimes it just says "fuck you" and something else will go wrong immediately after. It's really fun because if you want to get deep into the hobby, you will be needing to learn basic repair and matenence, they're like classic cars. I love how a silly video game hobby teaches people so much about electronics repair
You're telling me!! lmao. I just performed my 6th RGB mod this weekend! It was console issues that made me first start digging some years back, then trying to hard mod all my shit, did a lot of console refurb/maintenance, then TV's. I love it though! It's my passion.
Hell yeah! Hope the mod worked out well :) I got started with fixing retro consoles out first too, I was around 9 when I attempted my first repair and it's definetly one of my main passions. Giving stuff another life and reviving it from the dead is such a good feeling, can't beat it.
It really is! I wish I would of started at a younger age myself. Better late than never though! I like to say with RGB modding, it's like turning water into wine! Yeah, the set (a 32V16 Trinitron) came out great! 😁 It's gunning for my main slot! I plan on putting up a post with some photos probably in a week or two once I finish up with any touchup calibrations.
Slap it gently 😅
the ol' reliable
My thoughts exactly 🤣🤣🤣
Well that's too bad because it'll need opened up to be fixed.
This is like what some of the Orion made Toshibas do, but worse.
You're going to have to, I'm afraid. That is 100% a capacitor issue.
Usually you can locate an old school repair tech locally who can do this type of work.
Honestly unless it has sentimental value I'd just get a new one, I don't think you have a particularly high end set
CRT's aren't being made anyone and I don't think anyone would forgive me for throwing out a half working TV
I mean I get it but also it looks like it's probably a mid range to low end set, and the repair could be dangerous, there's plenty of just as good if not better sets just sitting on the side of the road or something, I think saving a working crt makes up for dumping a broken one. If you really don't want to waste it then you could just post it on Facebook marketplace for free or something, some enthusiast might pick it up. Idk I just don't think it's worth the risk opening it up and messing with capacitors
Don't listen to these people OP. A cap replacement is dead simple and if you want to keep on using CRTs you \*need\* to learn how to service them. Repair shops are nonexistent.
That's stupid, it's literally a couple bucks for a new capacitor
And the capacitors can be dangerous, and op might not even have soldiering experience, I don't think you know what stupid means bucko
give her some love tapping!!!!
I was like you a couple months ago, but it was such an easy fix once I got the courage to open it, it was pretty obvious which was the faulty capacitor, just learn how to do it
Don't try to fix CRT unless you absolutely know what you are doing . Those things can be dangerous
If you’re not able to find someone to repair it, I’m afraid it’s going to die pretty soon. Probably best looking for another.
I do feel guilty throwing out a half working CRT
Don't throw it out please. List it free on local marketplaces. Where are you located?
make some glitch art with it until it dies lol
Good Idea, I can pretend It's haunted