Don't Miss


Hitachi 14″ CRT TV Repair

By on August 5, 2015
crt tv repair

 

 

 

 

 

 

 

 

The complaint of this Hitachi CRT TV was white screen with horizontal lines.

crt tv white screen

The first section to check is the output dc voltage from the flyback transformer.

The voltage should be about 180VDC and it is going to the CRT RGB circuit section.

check flyback

The problem now is this voltage only measured 19.4 vdc which is too low.

TV 3

I had to trace this 180 vdc circuit line and I found an electrolytic capacitor leads already bad and a leaky diode.

TV 4

bad capacitor

After the replacement of the both components, the voltage now read at 163.9 Volt which is still in the acceptable range.

TV 6

Remember to clean the area with chemical and make sure all the components are properly fitted before turning On the power.  Once done the cleaning, I powered On the TV and it was working fine.

white screen in crt tv

suranga

This article was prepared for you by Suranga Bandara who owns an Electronics 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.

P.S-  If you enjoyed reading this, 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 repair article in the below link:

https://www.jestineyong.com/no-disk-in-dvd-player-repaired/

If you want to learn how to repair CRT TV then you can visit the link below:

http://www.electronicrepairguide.com/crt-tv-repair-ebook.html

 

Likes(201)Dislikes(2)

16 Comments

  1. vinnie cheluget

    August 5, 2015 at 1:48 pm

    Thank you so so so much for you grate educating notes and tutorials .....Thanks once more for I have learnt a lot from you....God bless

    Likes(4)Dislikes(0)
  2. Robert Calk

    August 5, 2015 at 7:42 pm

    Good job, Suranga. Thanks for the article.

    Likes(3)Dislikes(0)
  3. AWAIS

    August 5, 2015 at 7:52 pm

    Really v good job i like soo much your informative links
    that cause to encourage myself
    which liquide chemical we can use to wash pcb please advise

    Likes(5)Dislikes(0)
  4. Merlin Marquardt

    August 5, 2015 at 9:23 pm

    Very good repair.

    Likes(2)Dislikes(0)
  5. Yogesh Panchal

    August 5, 2015 at 11:01 pm

    Suranga,
    Thanks for sharing your experiance.

    Likes(1)Dislikes(0)
  6. S Ramachandran

    August 5, 2015 at 11:14 pm

    very good repair and right method of attacking the fault. keep it up.

    Likes(2)Dislikes(0)
  7. Zed Pato

    August 6, 2015 at 6:48 pm

    Good information for crt tv repair.

    Likes(2)Dislikes(0)
  8. mahmoud

    August 8, 2015 at 3:40 am

    very good article thanks alot.

    Likes(3)Dislikes(0)
  9. reza

    August 8, 2015 at 1:09 pm

    hi Suranga
    thank u.

    Likes(2)Dislikes(0)
  10. sherlan mamaril

    August 9, 2015 at 2:07 am

    i gonna repair the tv sharp similar to this and i have doubt that the video amp is the trouble, thanks to you sir jestine, you gave me more empowerment, ist a very similar symptomp

    Likes(3)Dislikes(0)
  11. Hassan Ali

    August 12, 2015 at 4:57 pm

    Fine! A week ago a friend of mine brought Philips ( Model 21PT176) with the same fault (white raster with fly back lines). The 22microF/250V and the diode were fine and 175V was there.
    I solved the problem by replacing the valve base with a new one!

    Likes(5)Dislikes(0)
  12. Om Arya

    November 23, 2015 at 1:10 am

    Which chemical did you use to clean the PCB?

    Likes(1)Dislikes(0)
  13. Irfan

    September 15, 2017 at 1:16 am

    i have 0v at rgb output of LA76810a. 8v supply to neck board is ok but 0v at rgb output pins so measured 0v at RGB amplifier transistors. There must be 3v at each pin of RGB output pins. Please help me what could be problem. What voltage supposed to be at input RGB pins coming from LA863328c IC. There is also 0v. I am too much confused whether first IC (LA76810a) is faulty or second on (LA863328c). Need your help dear experts

    Likes(0)Dislikes(0)
  14. James Imaga Emetu

    November 12, 2018 at 2:56 am

    Thanks a million does this work for all crt tv brands especially Philips?
    thanks once again

    Likes(0)Dislikes(0)

Leave a Reply

Your email address will not be published. Required fields are marked *

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

Free Report