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LCD Monitor With Hazy Display Repaired

By on July 9, 2016
lcd monitor repair guide









Customer brought to me a Viewsonic VA1703Wb LCD Monitor for repair. The complaint was Hazy Display.

I have connected the monitor on my PC and I switched ON the monitor, display start but screen showing Hazy Display and not be able to read anything on the display. See the photo below:

lcd monitor repair

So I asked the customer if he is not in hurry I will give him quotation by evening. He agreed and left the Monitor for me to diagonse.

Note:If you are not sure about fault symptom do not open the equipment in front of the customer.

After the customer had left, I opened the Monitor for inspection; found very dusty inside.

lcd monitor repairing

After cleaning, I removed both the PCB SMPS as well as the Logic Card and started to find if there is any burn mark, dry solder or physical damage but everything seems good. There was no physical damage indication.

lcd monitor repair circuit board

Most of the time this type of fault occurring due to either the LOGIC PCB or  the LVDS Cable not inserted properly. The problem  was that I am not having any spare Logic PCB or LVDS Cable with me for troubleshooting, hence taking chance by just clean up LVDS Cable Connector and Logic PCB connectors with IP. Next I put everything back together.

lcd monitor repair how tolcd monitor main board repair

By switching On the Monitor, to my surprise, the Monitor was back to life again-see the photo below:

repair lcd monitor

Conclusion: The display fault was caused by the presence of the heavy dust especially on the connectors. So cleaning the connectors solved the problem. I burn in test this Monitor on my work place for one whole day and  it worked perfectly fine.


This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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  1. suranga bandara, Suranga Electronics

    July 9, 2016 at 3:02 pm

    Mr-Yogesh Panchal,

    Good Repair !

    Thanks you.


    July 9, 2016 at 5:36 pm

    very nice, good work, simple and well done
    thanks for sharing

  3. Parasuraman S

    July 9, 2016 at 5:59 pm

    Very nice! Thanks for sharing!

  4. Anwar Shiekh

    July 9, 2016 at 11:50 pm

    I sometimes wonder about whiskers from unleaded solder; one clears these out when cleaning a board.

  5. Humberto

    July 11, 2016 at 11:10 pm

    Hi Yogesh, a simple procedure solved the malfunction of this LCD monitor. Congrats. and thanks for sharing your expertise.

  6. Albert van Bemmelen

    July 12, 2016 at 5:20 am

    Good Job Yogesh. The old CRT Televisions were real dust collectors.
    It is not often to see that even the new LCD sets do collect too
    much dirt. Which without a running Fan and without any airflow
    normally would not cause such problems. But as they say the
    exception confirmes the rule. And Cleaning is a job too!


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