Monday, November 23, 2015

Videocon 21' TV is not turning on

Usually I get a lot of inquiries from my customers and non-customers with regards to CRT television repair, for me to give the best possible solution to the problem I usually need crucial information from the make any serious conclusion.

The most important information to analyze a technical problem is actual voltage testing figures, the beauty with figures is that they never lie.
This is the data/information I process in making any suggesting as to the circuit causing the problem in question.

This means the accuracy of my advice will actually depend on you (tech), in fact 90 percent is on your side because you are the person on the ground.
Let us look at this question from one of my customer from India Mr.Mahadev Pawase.

Thursday, November 12, 2015

Buying ESR meter in Kenya

I usually get a lot of inquiries on where to buy ESR meter locally here in Kenya, personally I have done some research and most electronics shops attendant have no idea what it is.

Let’s hear this conversation between me and Paul Kabete from Kenya.

Paul: From my research including your recommendation I have come to see that an ESR meter is really handy for a good technician to save time and reduce guess work.

Wednesday, November 11, 2015

Sansui DVD player dead

Hi Humphrey.
I hope you well, I am busy repairing a Sansui DVD. I have scanned all the components looking for bad components, but there is no bad components.

I have checked the safety components of the primary circuit of this DVD everything is ok. I took my multitester meter checking for output voltage.

I found that the output voltage has dropped down. I tried to directly replace capacitors, but there is no improvement.

I have tried to locate the fault. I found that the output voltage has dropped from the secondary output diode. It uses ultra - superfast rectifier (SFF1004G). 

I could not replace this rectifier, because it is not available in the electronics shop. The only rectifier I can get is SFF1005G. I actually wanted to know that, can I replace SFF1004G with SFF1005G.

This diode has tested ok, now I am not sure whether it fails under operation.

Your help will be appreciated.
Mbhekeni Magugu
South Africa

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.

Saturday, August 29, 2015

Another do it yourself fly-back tester assembled and working

Hi Humphrey,
Hope you are well today! I just wanted to inquire if you can get me i.c CD4015 over there because I have moved around various stores here in Dar es Salaam to find any but in vain.
If it’s available I can make arrangements for acquiring a few pieces.

Thanks! Regards,

Monday, August 24, 2015

21 inch LG CRT television model 21FS6RG-T3 dead now repaired

I received a phone call from a client who wanted me to pass by his place to check on his TV which had a problem.

He told me he was referred to me by a gentleman who thought I can help him out of the problem, so I arranged a date and we meet at a specified location within my estate and off to his residence.

Upon arriving, the television which was already packed in the store was brought over to me and before opening I decided to apply power to see if there was any sign of life on the TV.

After applying power I got no symptom of power getting on and therefore decided to open the set…before opening the set the owner give me a disclaimer that the TV was from another technician.

Wednesday, August 19, 2015

Low output voltages from CRT monitor

Dear Sir,
I got CRT monitor. I have checked the voltages up to the big capacitors and everything is alright. When I check the voltages on the secondary side of the Transformer. I did not get good voltages.

I removed one leg of the diode and to check the voltage I heard a big sound in the neck board (one capacitor blown).

I don’t know why that happened. I am following your book which I have purchased online. Please help me. Do you want me send you some pictures of the board. This board is different from what you have shown in the book.
I will wait on your positive reply.

Best Regards,

Friday, July 17, 2015


A colleague of mine had a friend who wanted her television checked by a technician and he asked me if I can help her friend sort out the audio problem with her television

I fixed a date and off we went on site with him as my tour guide, I carried with me my usual minimum tools to help me with this assignment.

We found the television ON and the kid was watching the screen although there was no audio and I think this was good enough for a two year kid.

Tuesday, July 14, 2015

Sinotech CRT television with rainbow screen now repaired

One of my customers from Zimbabwe  Mr.Beau Friend send in an email to me a few days ago....let’s hear what he was up to.....

Greetings Humphrey,
A friend brought in a Sinotech CRT TV for repair - my TV repair experience is fairly limited hence I purchased your recent book to assist me in getting up to speed in this field of repair.
I've sent a picture of the fault - I have a very pretty rainbow effect but not exactly sure where to look for the fault.
I replaced a 1k resistor that had dropped to 270 ohms in the HOT circuitry but still the same - I've thoroughly checked the PCB for cold joints. Any suggestions?
Many thanks and kind regards,
Beau Friend