How To Repair Display Problem in Canca TV
A customer of mine sent in the Canca CRT TV with the complaint of display problem-see the above picture. From the first look it seems that either the horizontal/vertical oscillator circuit/IC was giving problem but I have to confirm the voltages from the power supply are working before do further testing.
Once the cover was removed I scanned through the TV circuit board to see if there is any burnt component, dry joints, loose connection and etc before checking on the power supply output voltages.
From the visual inspection I found a resin dipped ceramic capacitor was cracked and it was located at the B+ circuit line. The value of the capacitor was 471- 2 KV which means it was a 470 nanofarad capacitor with 2000 volt working voltage.
Upon careful inspection on this circuitry, I found that the B+ filter capacitor was also having problem and the value was 100uf with 250 v working voltage.
This capacitor chemical was leaked and dried up and can be seen from the photo below:
I checked further for any bad components around this circuitry but did not find any defective components. I concluded that there were only two bad components and after the replacement, the TV picture came back normally again.
Conclusion- Assuming if I did not find any bad components from visual inspection, I would have to turn the TV on and check on the output voltages of the power supply. If you would like to learn how to repair CRT TV like a professional, you can check out Humprey’s Ebook here.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous post in the below links:
https://jestineyong.com/flash-rom-ic-caused-standby-problem-in-led-tv/
http://www.electronicsrepairfaq.com/how-to-repair-no-power-problem-in-cfl-lamp
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Parasuraman
August 29, 2017 at 11:33 am
Great job by your usual straightforward approach!
suranag Electronics
August 29, 2017 at 6:31 pm
Thanks so much
Mr,Parasuraman
Albert
August 29, 2017 at 2:52 pm
I completely agree with Parasuraman's nice comment.
suranag Electronics
August 29, 2017 at 6:32 pm
Thanks! Mr, Albert.
Yogesh Panchal
August 30, 2017 at 1:00 am
Quick fix Good job! Suranga
Robert Calk
August 30, 2017 at 4:06 am
Good job, Suranga. I'm glad you were able to save the TV.
Humberto
August 30, 2017 at 2:23 pm
Good repair Suranga.
angelo
August 31, 2017 at 5:39 am
SIR SURANGA
i have noticed that you're a very lucky person
always easy fix..
congrats
M.V.Balakumar
September 5, 2017 at 1:51 pm
Excellent
Ulises aguilar pazzani
September 7, 2017 at 11:50 am
Mr Bandara , good job Sir keep it up
Endale Yetaferu
July 27, 2020 at 11:34 am
Thanks suranja for sharing your advise but my tv is canca & I turn on the TV by remote it works correct for 15_25 minutes after that it changes itself the menu without press the remote & button of the Tv finaly off the power what is the problem please help me
philipo
August 19, 2020 at 9:08 pm
thanks mr parasuraman help give me capastor 250v 33uf