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ACER 7254E CRT Monitor Repaired

By on August 18, 2014
crt monitor repair

 

 

 

 

 

 

 

 

 

I got this monitor from my friend for free. I like to repair although didn’t get profit and have planned to give this to the others. It is good to sharpen our troubleshooting skill from broken devices. I took this monitor home and start my job. When I connected it to PC and turn it on, the power on led indicator just blinks. There was no picture, I tried to put my back of hand to in front of CRT screen to feel the high voltage, I don’t feel it. It looks something shorted because the power on led indicator just blink and I was sure it has to do with secondary side on SMPS.

crt monitor repair

I took the cover out and start my troubleshooting. The first thing that I do was to look for any burnt components, bulged capacitor or dry joints but I found the bottom of PCB looks good and clean. I tested secondary diodes and one diode looks suspicious when I tested it with my multimeter on board. I removed one of this diode leg to make sure and those diode just tested good. This diode trace going to vertical circuit but I couldn’t find any faulty component.

 

Sometimes power blink could causes by defective horizontal circuit. I have tested the flyback with Ring Tester and internal capacitor also tested good. HOT and damper diode were checked good too. Scan through B+ circuit, finally I found B+ FET IRF630M is shorted when I check it on board. I removed it and make sure those B+ FET were developed short circuit.

 crt monitor repairs

When semiconductor failed, sometimes another component causes it or it just failed itself. I don’t want to make mistake so tried to check surrounding components and all were checked good. It is time to change it and see what will happen, if this didn’t cure the problem I have to troubleshoot further.

crt monitor repairing

Thanks God, this monitor alive again. I can see clear picture coming out and happy to keep this out of landfills.

crt monitor repairings

This article is contributed by Rudi Wijaya from North Sumatera Medan (Indonesia). He is an electronics repair hobbyist and specializes in TV, Monitor and DVD repair. He usually repairs the items that belong to friends and family.

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Likes(171)Dislikes(0)

29 Comments

  1. Atish Chand

    August 18, 2014 at 12:31 pm

    Thanks Rudi

    Likes(8)Dislikes(0)
    • Rudi Wijaya

      August 19, 2014 at 3:01 am

      You are welcome !
      Rudi

      Likes(1)Dislikes(0)
    • Rudi Wijaya

      August 19, 2014 at 10:56 am

      You are welcome.
      Rudi Wijaya

      Likes(1)Dislikes(0)
  2. Venu gopal

    August 18, 2014 at 1:29 pm

    well done , Thanks for the nice article.

    Likes(1)Dislikes(0)
  3. Fayaz

    August 18, 2014 at 2:14 pm

    Dear Rudi,

    In what section you found that FET faulty?

    Likes(1)Dislikes(0)
    • Rudi Wijaya

      August 19, 2014 at 3:10 am

      I found that FET failed on B+ circuitry. You can tell from those B+ coil just right beside this FET.
      Rudi Wijaya

      Likes(1)Dislikes(0)
  4. yogesh panchal

    August 18, 2014 at 2:26 pm

    Rudi,
    Thanks for sharing the article and i am totaly agree with you that practice will sharpen our troubleshooting skill.

    Likes(4)Dislikes(0)
  5. hongkongpom

    August 18, 2014 at 6:08 pm

    Your comment about keeping it out of the landfill at the expense of a single component is so prudent because these monitors contain so many dangerous materials...well done my friend!

    Likes(1)Dislikes(0)
  6. peter mlcciche

    August 18, 2014 at 9:27 pm

    Thank you for very interesting article
    These articles are very much appreciated

    Likes(0)Dislikes(0)
  7. reza

    August 18, 2014 at 10:42 pm

    hello
    i am reza from iran
    i read this artice
    and i use your experiance.

    Likes(2)Dislikes(0)
  8. Ekundyor

    August 18, 2014 at 11:53 pm

    Thanks,
    The lesson is rewarding!

    Likes(1)Dislikes(0)
  9. Humberto

    August 19, 2014 at 1:03 am

    Good repair Rudi Wijaya, congratulations

    Likes(1)Dislikes(0)
  10. Rudi Wijaya

    August 19, 2014 at 3:04 am

    You are welcome, everyone !!
    Rudi Wijaya

    Likes(1)Dislikes(0)
  11. Imraz

    August 19, 2014 at 4:54 am

    Nice diagnostic and repair work keep it up

    Likes(1)Dislikes(0)
  12. kiet le

    August 19, 2014 at 6:14 am

    Good work!

    Likes(0)Dislikes(0)
  13. Abdul

    August 19, 2014 at 9:43 am

    Rudi,
    Thank you for contributing the article.
    Hope to hear you often.

    Likes(2)Dislikes(0)
  14. Corriette

    August 19, 2014 at 10:07 am

    great job done

    Likes(1)Dislikes(0)
  15. Andre Gopee

    August 19, 2014 at 10:33 am

    Rudi I like your way off thinking...Keep them out of the land fill. Nice work keep it up.

    Likes(0)Dislikes(0)
  16. Taring K Arioka

    August 19, 2014 at 11:12 am

    Thank you for sharing

    Likes(0)Dislikes(0)
  17. Joshua oloo

    August 19, 2014 at 2:46 pm

    Thanks for sharing the repair tips.keep up the spirit.regards

    Likes(0)Dislikes(0)
  18. ramex

    August 19, 2014 at 4:12 pm

    nice tip of the day ,very good fault verification ,professional way of solving electronic faults but it would much appreciated if testing method on the bad fet had been shown.any ways keep up with your good wook. thanks buddy.

    Likes(0)Dislikes(0)
    • Rudi Wijaya

      August 19, 2014 at 6:19 pm

      ok, I noted it. you are welcome !
      Rudi Wijaya

      Likes(0)Dislikes(0)
  19. jakeryan

    August 21, 2014 at 7:26 am

    very nice topic... thanks a lot... more power

    Likes(0)Dislikes(0)
  20. Raymundo Saura

    August 27, 2014 at 4:31 pm

    thanks for sharing sir a great article for me very new in this world of electronics thank you sir

    Likes(0)Dislikes(0)
  21. Osman Alsinnary

    September 6, 2014 at 10:33 pm

    Good Job
    I faced this problem before with an LG 710

    Likes(1)Dislikes(0)
  22. Osman Alsinnary

    September 9, 2014 at 7:46 pm

    Also the first symptom or indicator of shortage in secondary section the power led blinking . Why ?
    Because there is small timer circuit try after 200 uS or 400 uS to start the power supply & trigger the relay & if there is high voltage drop or shortage in the secondary section it trigger the relay to disconnect & connect again .

    Likes(0)Dislikes(0)
  23. Hero

    August 13, 2015 at 12:07 am

    Hi!

    I am from Hong Kong and have three broken Acer CRT at home, I invited some technicians to fix them but no one successed, I decided to learn how to fix them so your article is a kind of encouragement.

    Likes(0)Dislikes(0)
    • Jestine Yong

      August 13, 2015 at 7:14 am

      Hi Hero,

      Thanks.

      Jestine

      Likes(0)Dislikes(0)
  24. Parasuraman S

    August 20, 2017 at 12:04 pm

    Could read this only now. Excellent article!

    Likes(0)Dislikes(0)

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