Horizontal Line Problem In CRT TV
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.
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:
When the e-cap was removed I found that the bottom part of the capacitor almost came off.
The value of the E-cap was 1000uf 35 volt and it was easy to find the part.
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:
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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March 28, 2017 at 11:03 pm
September 10, 2020 at 9:38 pm
I agree in other way bu i still have a question
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.
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.
March 29, 2017 at 1:07 pm
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.
March 29, 2017 at 2:43 pm
April 13, 2017 at 2:06 pm
e-caps are almost always the most defective components
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
May 15, 2017 at 9:08 pm
you are very good in electronics
June 15, 2017 at 6:02 pm
Good day sir
From a young age I've been fascinated by electronic repair but don't have the means to go to a college to study it so I read your e-books and I gain some knowledge to testing components troubleshooting I have fixed some CRT TV's from the knowledge I've gained from reading your e-books but what I would really like is to make a career out of it but I want to learn more
June 17, 2017 at 11:58 am
Ok noted. If you want to learn more you can visit this link https://jestineyong.com/resources-2/ where you can get the ebooks that you need and ask technical support from them. With this way you can learn very fast.
Ulises Aguilar Pazzani
June 27, 2017 at 11:55 am
MR Suranga , quick fix tks for sharing
July 22, 2017 at 6:08 pm
please I need help... my CRT TV is showing red lines on the screen even if u high or low the flyback transformer it wouldn't show any effect... please help me...
March 18, 2018 at 10:35 pm
thanks for helping. god bless you
September 13, 2017 at 1:31 am
Hi even me I face the same problem like yours but I am not lucky to repair it I changed all the capasitor around vertical ic and I check the voltage to vertical ic it was good atlast I replace the ic but still no lucky, please can you tell me the next step.
September 21, 2017 at 2:38 pm
please help me my CRT have vertical line have change the vertical ic
October 13, 2017 at 7:35 pm
Horizontal Line Problem In CRT TV - what is the price of it, if replaced
October 14, 2017 at 10:20 am
Can you elaborate? Because horizontal line problem cannot be sold.
shiyonzo nixon salvius
October 26, 2017 at 2:41 pm
jestin yong,through you i get more information about tv repair.thanks a lot.
November 4, 2017 at 7:43 pm
good morning Sir.... sir I have a TV CRT model 21SA6RG if I power the TV it will boast and drop at that moment the red light will on and off immediately pls help... but if I connect external power board, it will boast normal... I have changed the ic with this number STR w6554 and some resistors in its power board please help me
November 25, 2017 at 12:17 am
my tv can not turn on fuse okay
November 27, 2017 at 10:14 am
What have you checked ion both the problems?
November 25, 2017 at 12:21 am
lg tv has line on top of screen
Indra Kumar bhatt
November 28, 2017 at 8:11 pm
Please tell me how to solve horizontal line problem in lg 21fu3av
June 8, 2019 at 10:19 pm
Change 35 v 100 mf
February 3, 2018 at 9:19 am
What is a problem of horizontal line of china crt tv of pensonic model 1442 What parts is posible defective what section so pls help me thank you
March 14, 2018 at 2:30 am
What is problem of horizontal line of china kit I'm changed vertical ic78040 and main ic so pls help me thank you
May 16, 2018 at 10:35 am
Then check on the vertical output ic sapply in dc
May 1, 2019 at 8:17 pm
I have a CRT tv with a sharp orange line horizontal. have tried to change vertical ic bad capacitors dry joint checking the amount of current is receiving is okay but still it is not opening vertical please anyone with idea of how to handle it please help