Horizontal Line Problem In CRT TV

By on March 28, 2017
crt tv vertical output fault












crt tv vertical output problem

The complaint of this CRT TV was one horizontal line (about an inch thick). One horizontal line problem in CRT TV or Monitor is actually very common and the usual cause were dry joints in the vertical output IC, missing DC supply voltage to the vertical output IC, improper DC supply voltage (usually low dc supply voltage) , bad surrounding components, bad vertical output IC and etc. Sometimes the vertical yoke coils connector can have dry joints and in very rare case, vertical yoke coils can be open circuit. The photo below is just how a CRT TV look like once the cover was removed.

panasonic one horizontal line

The first thing to do is to use visual inspection to look around the vertical output IC section. I saw a slightly bulged e-caps that was located in the vertical output IC area-see  the photo below:

bad caps vertical problem in crt tv

When the e-cap was removed I found that the bottom part of the capacitor almost came off.

crt vtv one horizontal line problem

The value of the E-cap was 1000uf 35 volt and it was easy to find the part.

vertical fault in crt tv

I soldered the new e-cap and checked the surrounding components for dry joints and all the solder joints seems to be intact. I then turned On the TV and normal picture appeared-see the photo below:

how to repair one horizontal line fault

how to fix crt tv one horizontal line

Assuming in the above case I did not find the bulged e-cap, I will start to check on the DC supply voltage to the vertical output IC. If the DC supply voltage is good I will directly replace the vertical output IC and retest. If you would like to be a pro in troubleshooting and repairing CRT TV, I can recommend Humphreys Ebook to you. Check out his 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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  1. Parasuraman S

    March 28, 2017 at 11:03 pm

    Good Job!

  2. Albert van Bemmelen

    March 29, 2017 at 12:54 am

    Thank you for the article Suranga.
    I still have a lot of those 'old-style' CRT television and Commodore color monitors that still work fine. But I stopped repairing them because when they break down and they cost too much to repair or simply because parts are unavailable, I disassemble them for spare-parts. And I have a lot of parts already.

  3. Sam S.

    March 29, 2017 at 7:49 am

    I miss the old crt days. Made a lot of money repairing rear projection & direct view crt Tv's.

  4. reza

    March 29, 2017 at 1:07 pm

    Very good

  5. Isaac ganza

    March 29, 2017 at 1:29 pm

    Good job suranga! My country south-africa people still using crt tv's an iam still enjoying repairing them, not that stupid new technology of plasma, led, lcd an etc... Where you must replace a fault board instead of replacing 1/2 bad parts.

  6. Yogesh Panchal

    March 29, 2017 at 2:43 pm

    Good job!,Suranga.

  7. Humberto

    April 13, 2017 at 2:06 pm

    e-caps are almost always the most defective components

  8. angelo

    April 14, 2017 at 5:13 am

    i dont know how many people agree to this but
    i think the color of crt tv is 100 times better that lcd n led

    i still love it...

    good job Sir Suranga...
    i thought you were about to change the ver. ic as well
    thank you..


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