Saturday, October 31, 2015

Understanding how flyback transformer works

I have received several emails from techs out there asking how the flyback transformer works.


Kindly click the picture below to learn more about this very important component in CRT television/ monitor.


See you on the other side!


Monday, October 26, 2015

CRT Television with color problem now solved

Hello Humphrey, thank you very much for responding!
No, I am not a repair man, but I've read about repairs and troubleshooting on the internet, and I like to be thorough in my descriptions of problems.
 I thought I should tell you there's been a new development.
 With the picture on the screen, I turned the colour completely down to see if the picture would be perfectly black and white.
 It was not, and had a slight magenta/purple shade over it. I've read that this suggests it's a technical problem, not a set up problem.
 Also, when I was watching a DVD on the television, there were sometimes green blurs appearing and disappearing around the edges of the picture.
 And for very brief moments there are blue and green outlines around certain things in the picture, but they come and go.
I read that too much red in the picture can be caused by not enough green, and sure enough, when watching DVDs, at moments when there should be green in the picture, there is very little if any green.
Thank you very much for supplying the picture with the instructions to try re-soldering, it's very much appreciated and very useful!
Please can you tell me if this would likely solve these problems?
Yours sincerely

CRT Television with intermittent colour problem question

Email from the UK
Hello, I wondered if you could help me. I really like your website!

I have a problem with a CRT TV which I would like to repair if I can.

The picture has too much red, and sometimes too much blue or too much green.

But the problem is intermittent - it comes and goes - there are moments when the picture is perfect, then it has the problem again.

I am guessing that because there are moments when the picture is perfect, it's not likely to be the colour itself that needs adjusting, it's more likely to be a bad connection, like something that needs re-soldering.

Please can you tell me if you have seen this problem before and is there likely to be any chance of repairing it?

Thank you very much
Yours sincerely
James McCarty
Bedfordshire, UK

Sunday, October 4, 2015

How series bulb current limiter works

I have received a few questions on the operation of series bulb current limiter and in this lesson I wish to shed some light on this very old gadget and yet a favorites for both engineers and technicians around the world.
First let me point out that the principle used to make this gadget is very simple.

In basic electronics we have a concept called Ohms law, as you can see from the formula below we can conclude that ohms law basically describe the relationship between voltage, current and resistance in an electric circuit.


To understand this law let me use piped water analogy…Voltage is electric pressure just like water pressure in your tap and Current is the flow of electrons just like the flow of water from a tap and the tap can be considered as resistance.