How To Repair Vertical White Strips On Sony KV 2192M3 TV

By on February 1, 2017
crt tv self testing

 

 

 

 

 

 

 

 

 

 

This is an old Sony Trinitron CRT TV (KV 2192M3; Year:1993), but it still works perfect with brilliant picture quality.  However since recently, I saw few vertical white strips (Figure 1 & 2) come from left side of the TV screen and the pictures of that side was shown with low-contrast (see Figure 3)

vertical line problem in CRT TVHOW TO FIX CRT TV VERTICAL PROBLEM

vertical problem in crt tv

First try:

I thought this is an issue in the pincushion circuit (with JRC4558). So as the first try,  all the surrounding points were dry-soldered—but the issue was still there. Then JRC4558 and few surrounding electrolytic capacitors were replaced, but the issue remained the same.




Second try:

Then I turned to the Neck-card of the CRT. All the pints were dry sold. Further, all the resisters were checked with a DMM and all the electrolytic and ceramic Caps were tested with my homemade ESR meter. However still I couldn’t find the culprit for the issue. Further, all the voltages were OK according to the values of the schematic diagram.

Third try:

CRT TV vertical line problem

Then I changed the plan and check the Schematic of the TV carefully. A list of suspected electrolytic capacitors was taken. Most of them were around the FBT and the PIN-AMP module. Then I removed and check them one-by-one with my ESR meter. Within a few time, I was able to find one electrolytic capacitor ( C854- 330Uf/25V) with strange values- (see Figure 4).

esr meter

Even though it’s a 330UF one,  tester showed 234Uf with 21Ω ESR. It was on the voltage carrying path from FBT to PIN-AMP module. Then it was replaced with a new capacitor, Ho! At last the screen came back again with perfect colors (see figure 5 & 6).

how to fix crt tv vertical line problemcrt tv self test

 

This article was prepared for you by Kushan Ranatunga who works as a Network Engineer in Sri Langka. He has been doing  electronic experiments since age 11.




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You can also check his previous repair  article in the link below:

http://jestineyong.com/how-to-repair-cfl-bulb-lesson-learnt/

 

 

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18 Comments

  1. Albert van Bemmelen

    February 1, 2017 at 9:22 pm

    Interesting repair Kushan. And thanks for the schematic. Those older Sony CTVs are still working after all those years. I own an even older (1981?) portable Sony KN1614E than yours. But although the CTV works still fine after all those years, it now smells a bit after long not having been used. Maybe because of moisture inside? I'm not sure what the reason is because it works fine. And no screen problems either.
    So that's why I'm thinking of disassembling the device for parts only. Anyway I need the space. But if anyone wants it, he or she may come and get this TV for Free.

    Likes(3)Dislikes(0)
    • Kushan

      February 2, 2017 at 2:11 pm

      Thanks Bemmelen, you are correct still the old Sonys perform well. according to you even after 35Y+ , its working ... can we expect this with new LED TV ? 🙂

      Likes(2)Dislikes(0)
      • Humberto

        February 10, 2017 at 10:11 pm

        Hi Albert and Kushan. Answering to Kushan, I expect new LED technology won't last so much. In my own opinion.

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  2. Parasuraman S

    February 1, 2017 at 11:18 pm

    Excellent! A real hunting down, with the culprit capacitor replaced!

    Since the white line is on the horizontal sweep section, we can always look for a leaky or dry capacitor in that area straight.

    Likes(3)Dislikes(0)
    • Kushan

      February 2, 2017 at 2:12 pm

      Thanks ! you are correct !

      Likes(1)Dislikes(0)
  3. Joop

    February 1, 2017 at 11:55 pm

    good Job!

    Likes(2)Dislikes(0)
  4. Mohammed Imraz Ali

    February 2, 2017 at 5:17 am

    Nice to still see those CRT TV Repairing Article, Good Work and its an old noted fault in CRT's

    Likes(1)Dislikes(0)
    • Kushan

      February 2, 2017 at 2:15 pm

      Hi Imraz;

      Actually by repairing CRTs , you can understand electronic theories and mechanisms correctly, i suppose.

      Likes(2)Dislikes(0)
  5. Cyril De Zoysa

    February 2, 2017 at 8:03 am

    Nice discovery.

    Likes(0)Dislikes(0)
  6. Mohamed Sittiq M

    February 2, 2017 at 1:19 pm

    Dear Sir,

    Thanks for sharing information. kindly give me homemade esr schematic website link or schematic.

    Likes(0)Dislikes(0)
    • Kushan

      February 2, 2017 at 2:19 pm

      Thanks,

      some years ago i bought following type of DIY kit and made one. its very useful !

      http://www.ebay.com/itm/LCR-T3-Mega328-Transistor-Tester-Diode-Triode-Capacitance-ESR-Meter-NPN-PNP-CASE-/272449129495?var=&hash=item3f6f3bcc17:m:mKh_VVPb_2igJmBlLW5Dkeg

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  7. suraga Electronics

    February 2, 2017 at 5:41 pm

    Hi. Mr-Kushan,

    Well done. Excellent Repair Job
    and write the Continue.
    Thanks !

    Likes(2)Dislikes(0)
  8. Luciano Khware

    February 3, 2017 at 3:54 pm

    Hi Mr. Kushan,
    Thanks for the successful repair story. Keep it up!
    Regards!

    Likes(0)Dislikes(0)
  9. Robert Calk

    February 4, 2017 at 1:10 am

    Nice job, Kushan. Thanks for the article.

    Likes(0)Dislikes(0)
  10. Yogesh Panchal

    February 4, 2017 at 7:13 pm

    Good Repair! Kushan,
    Keep Sharing.

    Likes(0)Dislikes(0)
  11. Samsudeen

    February 5, 2017 at 12:33 am

    Very well job.and interesting thankyou for sharing

    Likes(0)Dislikes(0)
  12. Calum

    February 7, 2017 at 9:25 pm

    great job

    Likes(0)Dislikes(0)
  13. zaheedi farjan

    March 31, 2017 at 12:13 am

    I would like to know how to repair white lines on sony bravia 40 inch lcd
    Best regards
    Zaheedi farjan

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