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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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