Small Width In Hitachi CRT TV

 

 

 

 

Customer sent to me this 21″ Hitachi with the complaint of small width display (squeezed display at both left and right side)….see the above photo. For your information, if the display width is small, usually is due to less B+ voltage to the flyback transformer or the safety capacitor value already decreased.

If the problem is small width display with curve inward at both side, it can be due to shorted modulation diode but it can also be due to less B+ voltage or both.

As you know one of my procedures in troubleshooting a circuit board is to use visual inspection first before I use my meters to check on the voltage and components. Visual inspection can see bulged capacitor, broken wire and traces, burnt components (ex black mark at the side of IC or even pinhole on top of IC), dry joints and etc.

In the above case I found the B+ voltage capacitor that was bulged and the value was 100uf 200volt.

Replacing the only capacitor solved the small width display problem. 

Conclusion- It was quite easy to solve this problem. Assuming after the replacement of the capacitor and the display is still small then I will proceed to check on the safety capacitor or even the modulation diode. If you want to be good in CRT TV Repair you can check out on Humphrey’s CRT TV Repair ebook here.

This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.

P.S-  If you enjoyed reading the above article, 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!

Note: You may check out his previous post in the below links:

https://jestineyong.com/one-vertical-line-in-29-hitachi-tv-repaired/

 

4 Comments

1. 

   Parasuraman S

   November 30, 2020 at 5:40 pm

   Another straight forward expert job there! Well done!

   Likes(5)Dislikes(0)

   Reply
2. 

   Yogesh Panchal

   November 30, 2020 at 5:56 pm

   Good Repair! Suranga

   Likes(3)Dislikes(0)

   Reply
3. 

   Albert van Bemmelen

   November 30, 2020 at 11:13 pm

   Maybe you also changed the bulged 100uF 200V for a higher max voltage capacitor to prevent the risk of happening again.

   Likes(2)Dislikes(0)

   Reply
4. 

   Anwar Y Shiekh

   December 1, 2020 at 4:22 am

   Do my eyes deceive me or do I see two bulging capacitors in the picture?

   Likes(2)Dislikes(0)

   Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.