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Samsung Monitor Sync Master B2030 Repaired

By on November 21, 2020
SAMSUNG LCD MONITOR REPAIR

 

 

 

 

 

 

 

how to fix samsung lcd monitor

My friend Vijander brought me his Samsung Monitor Sync Master B2030 stating that it is not coming on.  He also told me that for long time this monitor was not used and it was kept in the store.

I checked it and found that Power ON LED is not coming on.  I understood that the problem is in the power supply circuit. Dismantling the monitor was easy. I physically checked and found that due to corrosion some of the components got rust and the LVDS cable has also gone faulty due to this.

                     faulty lcd monitor samsung mainboard         bad lcd monitor samsung mainboard

After removing the LVDS cable and other connected cables from the Power supply board, I switched on the Power Supply board to check if the 5 volt and 15 Volts are OK or not.

I also observed that the LVDS cable’s connection points were corroded and broken.  But first I focused on Power supply.

bad lvds cable

There was no output from power supply while the input AC voltage was fine.  Voltage was also fine at main filter capacitor.  Then I checked the voltage at the Pin 1 of Optocoupler 817C.  Found it was fluctuating between 2 to 2.16 volts which is vary less.   I also checked the output capacitors of 1000 uf and 470 uf.  All were showing high ESR.  From here I was sure that capacitors are having problem.

I replaced the output capacitors and for safer side I replaced the Optocoupler also.  After replacing these components I checked the output voltages, and found that 5 Volt and 15 Volt were coming now and stable.




I also replaced the LVDS cable with the new Cable and reassembled the monitor.

                       fix lvds cable in monitor         how to fix and repair samsung lcd monitor

Now you can see the monitor is coming on and power on LED (Blue) is also coming on.

Problem solved.

Cheers……………!!!

Kishan Singh Rawat

This article was prepared by Kishan Singh Rawat, a Telecom engineer and electronic enthusiast with more than 35 years of experience in Telecom / Broadcasting industry, residing in Delhi, India.  Presently working as AVP in renowned News Broadcasting Company of India.

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You may check on his previous repair article below:

https://jestineyong.com/paper-shredder-s421-not-working-repaired/

 

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7 Comments

  1. Mathew Charles karonga

    November 21, 2020 at 3:39 pm

    Job we'll done and well explained keep up the good work

    Likes(2)Dislikes(0)
  2. Albert van Bemmelen

    November 21, 2020 at 5:39 pm

    Thanks for a well written repair Kishan! If it are not uninvited guests in appliances it is often corrosion, and both are not easy to prevent. After dangerous dryers that can catch fire because they accumulate dust, they say it are the refrigerators because they're packed with inflammable insulation that can give off toxic gas. Replacing the LVDS cable here was of course the only option because fixing them is close to impossible.

    Likes(3)Dislikes(0)
    • Humberto

      November 22, 2020 at 11:03 am

      I agree with you. LVDS cables are very difficult to repair.

      Likes(0)Dislikes(0)
  3. babums

    November 21, 2020 at 10:55 pm

    Very good repair work and very clear details given in the article. Thank you very much for sharing.

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

    November 22, 2020 at 1:04 am

    Good Repair Sir,

    Likes(0)Dislikes(0)
  5. Lewis Spedding

    November 22, 2020 at 1:16 am

    Great repair well done. I have a switch mode power supply i am repairing so I was interested in this. Hope to see more from you.

    Likes(0)Dislikes(0)
  6. Humberto

    November 22, 2020 at 11:03 am

    Good repair. Congrats.

    Likes(0)Dislikes(0)

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