Uneconomical Repair Necessitated Replacement Of Board Once More In Samsung CRT TV

This was a Samsung CRT TV that belonged to one of my neighbors, in which the original board got replaced in October,2015 and rework done on it in April, 2020, which I have reported vide my previous article on the same set, link of which is being provided herein:
https://jestineyong.com/horizontal-output-transistor-failed-in-samsung-crt-tv-with-china-kit/
It was brought to me again in September, 2024 with the complaint that the picture was jumping and sometimes it got off & on its own. Since this customer do help me by handling the heavy TV himself, I accepted the repair upon which he hand carried it and brought it to my car porch. I opened the back cover and cleaned the inside. Then he moved the heavy CRT TV onto a make shift wooden chair, keeping it in such a way to facilitate easy trouble shooting, and left. I applied power and found that the neck was arcing and that was the reason for the lines to appear and TV getting off due to protection. Now, the question was whether the CRT tube was defective or the board?
When I checked the voltages of the RGB and Screen, I found these to be ok. On checking with my techie friends, I learnt that the FBT (Fly back transformer) or the main IC itself would be defective. I removed the Horizontal output transistor and checked and found it to be ok. The oscillation on the primary of the driver transformer was not proper indicating a defect in the main IC, as all components on the path were tested to be ok. Since this called for replacement of the Main IC, the FBT and the H-out Transistor (all should be replaced together for sure to avoid repletion of failure), it purported to be an uneconomical repair for this board as new board was available for almost the same cost. When I discussed with the customer, he opted to go for a new board, as the Tube was still in good working condition. (Remember that a good amount was already spent on this board on its last repair!) This is the picture of the old board, which was getting ‘retrenched’ due to ill-health after serving for NINE good years!
The customer himself went and bought a new Board. I removed the old fittings and gave it to the customer with the old board suggesting that he keep it safe for salvaging good parts as and when found necessary. Then undertook fitting the new board. For those who might be interested in knowing how to fix a new board, I am providing some pictures below with appropriate self-explanatory descriptions:
Then routed the front panel wires through the gap which was already there on the front side of the TV Cabinet. The Red wire of Horizontal Deflection is isolated from the Deflection Wire connector and this is to be inserted on the appropriate pin near the FBT as marked by me in the picture of the old board. Changing position to each pin would increase the width to suit the Screen Size of the TV. In this case anyhow, the first pin was the correct position to fit the picture within the frame. After rechecking all connections, I kept the screen and focus adjustments on the FBT at minimum and applied power.
Then slowly increased the screen voltage to get a clear picture and adjusted its focus properly. Then fed a video signal and choosing the menu adjusted the brightness, color and contrast to minimum and readjusted the screen voltage to make the display fully dark. This adjustment is necessary to avoid over voltage if and when the these settings are increased by the customer to suit their viewing pleasure. Then adjusted the brightness, contrast and color one by one to get a good picture. The picture was of excellent quality, as can be seen:
Now, with your permission, let me say that the mission was accomplished resulting in satisfaction getting added to the collection!
Should you require any clarifications on the work done, please do not hesitate to write in your comments! For more detailed guidelines for fixing a new Chine Kit in CRT TV, please refer to my exclusive article and the comments under it:
https://jestineyong.com/fixing-es-china-kit-in-crt-tv/
This was written by me as desired by Electronic Expert, Albert van Bemmelen.
This article was prepared for you by Parasuraman Subramanian from India. He is 74 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on Multiple Problems Solved In This Marantz Integrated Amplifier Model PM-75



Albert van Bemmelen
January 25, 2025 at 2:51 pm
Another incredibly and professionally done crt repair
with unexpected nice surprise added in the very
interesting article "fixing-es-china-kit-in-crt-tv"
dear Parasuraman! Thanks for taking the extra time to
make this!
It will be a very important learning experience for me
since my knowledge in using these universal replacement boards and fixing old crt sets is still very limited!
No doubt that now also many other readers on Jestine's
blog will be able to enjoy and prosper from your
extraordinary knowledge in using these universal boards!
Parasuraman S
January 25, 2025 at 6:45 pm
Many thanks for your expert and experienced comments, dear Albert!
Yogesh Panchal
January 25, 2025 at 2:54 pm
Good Job!Sir,
After spending on parts Getting Original working parts are always Challenge.
Parasuraman S
January 25, 2025 at 6:46 pm
We get a lot of spurious spares putting us in jeopardy! Many thanks, for your comments, dear Yogesh Bai!
Waleed Rishmawi
January 25, 2025 at 8:25 pm
very interesting repair. I am a little bit surprised that these boards are still found out there. the CRT TV's in my home town no longer existed but I am glad you were able to help the customer out. thanks for sharing and have a blessed day.
Parasuraman S
January 25, 2025 at 10:49 pm
Many thanks, dear friend!
Mark J
January 26, 2025 at 4:02 am
I do not have much experience working on CRTs. Well done Parasuraman.
Parasuraman S
January 26, 2025 at 6:16 pm
I think, CRTs will extinct soon here also. Many thanks, dear Mark!
MUYKIT
January 26, 2025 at 10:41 pm
Thank you Engineer Parasuraman for showing great dedication and a big commitment to the Jestine Yong website. Thanks again for your detailed direction of CRT TV repair. ln April 2024 when I started reading your CRT TV repair articles I understood close to nothing but I knew there was much to learn about electronics and electronics repair. So I continued reading more articles until I started catching up. That helped me to make a 25 inch Toshiba CRT TV that was dead to come on by replacing its HOT(2539), a 1500V ceramic capacitor and a diode-looking like resistor. Though the TV has pincushon, which if found difficult to deal with, then motherboard change will be the way to go following your easy illustration. Please always give precise instructions on the high death trap voltages and how to effectively discharge the voltages before any repair. The younger generation may be unaware of the lacking danger. Lastly, I always appreciate Alberts comments but I know he no longer sees CRT TVs, anyway thanks Albert.
Parasuraman S
January 27, 2025 at 3:26 pm
Many thanks for your comments and inputs! The best way to discharge the very high residual voltage oin the CRT is to pull the mains cord off and keep the TV in off condition for a few minutes. Then take a screw driver, connect a crocodile clip wire between the ground and its blade and insert inside the anode cap. Better you wear gloves as an additional protection. Since current is very less, it won't be lethal, but enough to cause a burn or temporary pain upto the arm pit or more. I have experienced this shock a few times inspite of all the cautions that I take. Especially from the tank capacitors!